Building Society Fixed Rate Mortgage Guide UK

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UK Fixed-Rate Mortgage Guide · October 2026

Building Society Fixed Rate Mortgages: 2-Year vs 5-Year Deals, Costs & Switching

A building society fixed rate mortgage gives you an agreed interest rate for a set period, commonly two or five years. Your contractual repayment on a standard repayment mortgage normally stays the same throughout that period, making household budgeting more predictable.

The difficult decision is not simply finding the lowest advertised rate. You need to compare the fixed period, product fees, loan-to-value band, Early Repayment Charges, overpayment rules and what happens when the deal ends.

This UK guide explains how fixed deals work, when a two-year or five-year fix may suit different circumstances, how building society mortgage switching works and how to calculate the real repayment cost before applying.

Calculate Mortgage Repayments Compare 2-Year vs 5-Year Check Building Society Options
Mortgage risk: A fixed rate protects your mortgage interest rate from market movements during the agreed deal period, but it does not guarantee affordability for the whole mortgage term. Your home may be repossessed if you do not keep up repayments on your mortgage.

Independent editorial review: 16 October 2026. Mortgage offers, rates, fees, lending criteria and availability can change. Always obtain the current official mortgage illustration before applying.

Fixed Rate Mortgages: Quick Answers

2 years A common shorter fixed-rate deal period.
5 years A common longer fixed-rate deal period.
Fixed interest Your mortgage interest rate is agreed for the deal period.
ERC risk Leaving or repaying too much during the fixed period may trigger a charge.
Product fee A lower advertised rate can come with a higher upfront or added fee.
Deal expiry Without a new deal, the mortgage normally moves onto a lender’s applicable variable reversion rate.
Fast answer: Choose a fixed-rate mortgage when predictable interest costs are important. A two-year fix allows an earlier rate review, while a five-year fix provides longer certainty. Neither option is automatically cheaper — the correct comparison includes product fees, likely future plans and the total amount payable.

How Does a Building Society Fixed Rate Mortgage Work?

When you take out a fixed-rate mortgage, your building society agrees to charge a particular mortgage interest rate for a defined period. Market interest-rate changes do not automatically change that contractual rate while your fix remains active.

For example, a five-year fixed mortgage at an illustrative 4.5% rate charges that rate during the fixed period, even if the Bank of England base rate rises or falls. Your normal repayment remains predictable, assuming a standard repayment arrangement without relevant contractual changes.

However, the fixed-rate period is usually much shorter than the full mortgage repayment term.

Mortgage term

The overall period allowed to repay the loan, such as 25 or 30 years.

Fixed-rate period

The shorter period during which the agreed interest rate applies, such as two or five years.

Contractual payment

For a capital-and-interest mortgage, the normal monthly payment covers interest and some of the borrowed capital.

Reversion rate

The rate that applies after the initial deal ends unless another arrangement is agreed.

Example: A 25-year mortgage with a five-year fix does not become fully repaid after five years. The fixed interest period ends, but the remaining mortgage continues for approximately another 20 years unless repayments or the mortgage term change.

Independent UK guidanceMoneyHelper: Understanding Mortgage Interest Rates

After opening this link:

  1. Find the fixed-rate mortgage explanation.
  2. Compare the fixed and variable-rate sections.
  3. Review the advantages and disadvantages of each.
  4. Read what happens to repayments when a fixed period ends.
  5. Use the information to identify which questions to ask a mortgage adviser.

2-Year vs 5-Year Fixed Rate Mortgage: Which Is Better?

The main trade-off is flexibility versus longer repayment certainty. A two-year fix lets you review mortgage products sooner, but introduces another rate decision relatively quickly. A five-year fix provides more time without a rate change, but can be expensive to leave early.

2-Year Fixed Mortgage

  • Interest rate fixed for approximately two years.
  • Opportunity to review the market sooner.
  • May suit borrowers expecting changes in their circumstances.
  • Potential need to pay another product fee sooner.
  • Greater exposure to mortgage rates available in two years.
  • ERC period is often shorter than on a five-year product.

5-Year Fixed Mortgage

  • Interest rate fixed for approximately five years.
  • Longer certainty for monthly budgeting.
  • Potentially fewer product switches within five years.
  • Less benefit if market mortgage rates fall.
  • May have ERCs extending across much of the five-year period.
  • Useful when a stable payment is particularly valuable.

How to Decide Between Two and Five Years

Your situation
2-year fix consideration
5-year fix consideration
Need stable household spending
Certainty for a shorter period.
Certainty for a longer period.
Likely to move home
Shorter ERC commitment may provide flexibility.
Check mortgage portability and ERCs carefully.
Expect rates to fall
Earlier opportunity to seek a new rate.
Could remain above later market rates.
Concerned about rising rates
Protection ends sooner.
Longer protection against future increases.
Product fees
May need another fee at the next deal change.
One fee may cover a longer initial deal period.
No one can reliably guarantee future mortgage rates. A two-year deal is not automatically better because you expect rates to fall, and a five-year deal is not automatically better because you fear increases. Consider what your finances can withstand if your prediction is wrong.

Fixed Rate Mortgage Calculator: Monthly Repayments and Rate Changes

Enter your mortgage balance, remaining repayment term, current fixed rate and a second interest rate to compare. The calculator estimates standard capital-and-interest monthly repayments and illustrates how payments could change at the end of the selected fixed period.

Monthly repayment during fix —
Estimated balance at fix end —
Repayment after rate change —
Monthly payment difference —
Interest paid during fixed period —
Initial fee plus fixed-period interest —
Calculator assumptions: Standard repayment mortgage, constant monthly interest calculation, unchanged contractual term, no overpayments, no added fees, no ERCs and no change in payment frequency. The product fee is treated as paid upfront rather than added to the mortgage balance. The second rate is only a scenario, not a forecast or lender quotation.

Fixed Rate Mortgage Costs: Why the Lowest Rate Is Not Always Cheapest

When comparing building society fixed rates, pay attention to the entire mortgage illustration rather than choosing the product with the smallest advertised percentage.

Initial interest rate

The fixed percentage charged during the agreed deal period.

Product fee

A fee associated with the selected mortgage product. Some lenders offer fee-free alternatives at different rates.

Valuation costs

The lender may provide a basic valuation at no cost or charge for one, depending on the product.

Legal costs

These can apply when purchasing or remortgaging. Some remortgage deals include legal assistance or cashback.

Early Repayment Charge

May apply if you leave the mortgage product early or exceed the permitted overpayment allowance.

Reversion rate

The rate payable after the fixed period unless you arrange a new deal.

Example: A Lower Rate with a £999 Product Fee

Suppose you are comparing a 4.40% deal carrying a £999 fee with a 4.60% fee-free deal. The lower-rate product may save interest, but whether it saves enough depends on the outstanding balance, deal length, repayment schedule and how fees are paid.

A borrower with a relatively small mortgage may find that the fee absorbs much of the interest saving. Someone with a larger mortgage may benefit more from the reduced interest rate.

Compare like for like: Keep the mortgage balance, term, repayment method and fixed-period length consistent when comparing products. Include cashbacks and any costs of switching, and check whether fees are paid upfront or added to the mortgage.

Official MoneyHelperMortgage Fees and Buying Costs

After opening this link:

  1. Find the section on mortgage booking, arrangement and account fees.
  2. Check possible valuation and legal costs.
  3. Read the warning about adding fees to the mortgage balance.
  4. Review remortgage and Early Repayment Charge costs.
  5. Use the fee information alongside the mortgage illustration before deciding.

Mortgage Deposits and Loan-to-Value Bands

Building society mortgage rates can differ by loan-to-value (LTV). LTV expresses the mortgage borrowing as a percentage of the lender’s accepted property value.

For example, a £200,000 mortgage on a £250,000 property represents 80% LTV. The borrower has £50,000 of deposit or equity in this illustration.

LTV
Deposit or equity on £250,000 property
Mortgage amount
95%
£12,500
£237,500
90%
£25,000
£225,000
85%
£37,500
£212,500
75%
£62,500
£187,500
60%
£100,000
£150,000

Lower LTV bands can sometimes provide access to more competitive mortgage pricing. However, not every lender has the same bands, and increasing your deposit by a small amount does not always move you into a cheaper product category.

Existing homeowners: Do not assume your estimate of the property’s value will be accepted. A lender may use an indexed valuation, automated valuation or another assessment when calculating LTV.

UK Building Society Fixed Rate Mortgages: Where to Compare

Building societies offer fixed-rate products for different borrower types. Some have straightforward residential ranges, while others provide specialist mortgage options through advisers or intermediary channels.

The services below are useful starting points. This is not a ranking of the cheapest lenders, and no headline mortgage rate is presented as permanently available.

Building society
Useful official route
What to compare
Nationwide
Fixed-rate products and existing-customer mortgage switching.
Deal length, product fees, Mortgage Manager eligibility and ERCs.
Yorkshire Building Society
Mortgage products and product-transfer guidance.
Fixed rates, LTV, transfer process and product flexibility.
Coventry Building Society
Mortgage product comparison and existing-borrower services.
Fees, rates, repayment conditions and switching rules.
Skipton Building Society
Mortgage finder for available deals.
Deposit bands, initial rates, incentives and ERC schedules.
Leeds Building Society
Residential and specialist mortgage information.
Borrowing criteria, product fees and specialist eligibility.
Accord Mortgages
Broker-distributed products within the Yorkshire Building Society group.
Intermediary availability, product-transfer options and property criteria.

Official NationwideNationwide Mortgage Products and Rates

After opening this link:

  1. Choose first-time buyer, home mover, remortgage or existing mortgage customer.
  2. Use the mortgage rate or deal comparison route.
  3. Enter relevant property value, borrowing amount and mortgage term where requested.
  4. Compare fixed-period lengths, interest rates and product fees.
  5. Open the full product information before proceeding to an application.

Official YorkshireYorkshire Building Society Mortgage Services

After opening this link:

  1. Select the mortgage journey matching your circumstances.
  2. Find the available rates or product information.
  3. Compare fixed deals by LTV and borrowing amount.
  4. Check whether you can apply directly or need mortgage advice.
  5. For an existing mortgage, use the switching or product-transfer guidance.

Official SkiptonSkipton Building Society Mortgage Finder

After opening this link:

  1. Choose the mortgage type and property purpose.
  2. Enter the relevant deposit or equity and loan amount.
  3. Compare available fixed-rate products.
  4. Open the details for arrangement fees, incentives and ERCs.
  5. Check lending conditions before applying.

Official LeedsLeeds Building Society Mortgages

After opening this link:

  1. Select the relevant residential or specialist mortgage category.
  2. Read the eligibility requirements.
  3. Review available fixed-rate product details.
  4. Check fees, loan limits and repayment terms.
  5. Use the lender’s application or intermediary route as directed.
Compare current products, not old rate tables. A mortgage fixed at a particular rate remains fixed for the borrower who accepted it, but new-customer products may be withdrawn or repriced repeatedly.

Who Can Qualify for a Building Society Fixed Rate Mortgage?

Building society mortgage approval depends on affordability, credit history, income, deposit or equity, the property and the lender’s current lending policy.

First-time buyers

May qualify for fixed products if they meet the deposit, income, affordability and property conditions.

Home movers

Can compare new fixed deals and may be able to port an eligible existing mortgage.

Remortgage applicants

Normally undergo lender affordability, credit and property checks when moving to a different provider.

Existing mortgage members

May qualify for an internal product transfer, which can have a simpler process than a full remortgage.

Self-employed borrowers

Can be eligible but may need tax calculations, accounts, income evidence or additional underwriting.

Specialist applicants

Shared ownership, later-life, unusual-property and buy-to-let borrowers may need a specialist product or lender.

Documents Commonly Requested

  • Valid proof of identity.
  • Address history and current address details.
  • Evidence of employment income.
  • Self-employed income records where applicable.
  • Recent bank statements when requested.
  • Details of existing credit commitments.
  • Proof of deposit and its source.
  • Property and purchase information.
  • Existing mortgage statement for remortgages.
  • Information about dependants and regular expenses.
Decision in Principle: An initial assessment is not a final mortgage offer. Do not assume a fixed rate has been secured merely because an affordability calculator or Decision in Principle produces a positive result.

How to Apply for a Building Society Fixed Rate Mortgage

The application route depends on whether you are buying a property, remortgaging to a different lender or switching an existing mortgage deal.

  1. Calculate your budget. Consider the deposit, monthly repayment, buying costs and emergency savings.
  2. Identify your mortgage type. Choose first-time buyer, home mover, remortgage or existing-customer product transfer.
  3. Compare suitable products. Review rates, fees, LTV bands, fixed periods and overpayment rules.
  4. Check eligibility. Confirm the lender accepts your income, property type and borrowing circumstances.
  5. Seek a Decision in Principle. Where available, use it to assess initial borrowing eligibility.
  6. Submit the full application. Provide documents and complete any mortgage-advice process.
  7. Complete valuation and underwriting. The lender checks the security property and affordability.
  8. Review the mortgage offer. Check the exact fixed-rate end date, total cost, fees and ERC schedule.
  9. Arrange completion. For a purchase or external remortgage, the solicitor or conveyancer normally handles the required legal work.
  10. Monitor the deal expiry. Record when the fixed period ends and plan the next rate review in advance.
Rate reservation: The point at which a product is secured depends on the lender’s process. Check the product reservation or offer rules, expiry date and any conditions before relying on the advertised rate.

Early Repayment Charges on Fixed Rate Mortgages

An Early Repayment Charge (ERC) is a contractual fee that may apply when you repay your fixed-rate mortgage early, switch products before the permitted date or make overpayments beyond the agreed allowance.

ERCs are commonly calculated as a percentage of the relevant mortgage balance or amount repaid. The percentages and applicable dates vary by mortgage product.

Illustrative Early Repayment Charge

£180,000 Outstanding mortgage balance.
3% Illustrative applicable ERC.
£5,400 Illustrative charge if 3% applies to the full £180,000 redeemed.

This example assumes the contractual charge applies to the full redeemed balance. The calculation could be different where an allowance, partial repayment or alternative ERC basis applies.

Changing mortgage lender

Leaving before the fixed period ends may trigger an ERC and other redemption costs.

Moving home

If the mortgage cannot be ported, repaying it during the fixed period may trigger a charge.

Large overpayment

Payments above the penalty-free allowance may incur an ERC.

Switching rates early

The lender may charge for replacing a fixed product before the permitted switch window.

Do not assume the ERC ends on the last day of the calendar month. Your offer may specify an exact deal-end date. Ask for an accurate redemption figure before arranging completion with another lender.

Official NationwideNationwide Guide to Switching a Mortgage Deal

After opening this link:

  1. Read the fixed-rate switching section.
  2. Check the point at which an ERC may apply.
  3. Review the rules for switching to a new deal.
  4. Read the cancellation process for an agreed product switch.
  5. Compare any applicable ERC against the potential interest saving.

Can You Overpay a Fixed Rate Mortgage?

Many building society fixed mortgages permit limited overpayments without ERCs. A common allowance is up to 10% per year, but this is a product feature rather than a universal legal right.

The lender may calculate the allowance using the original loan balance, the balance at a specified annual date or another contractual basis.

£200,000 Illustrative balance used for allowance purposes.
10% Illustrative annual overpayment allowance.
£20,000 Illustrative maximum before accounting for earlier overpayments.

If you have already made £5,000 of qualifying overpayments during that allowance period, you may have only £15,000 remaining under this illustration.

Check the reset date: Your annual allowance may run by mortgage anniversary, calendar year or product year. Some mortgages do not carry unused allowance into the next year.

Official overpayment guidanceNationwide Mortgage Overpayments

After opening this link:

  1. Find the fixed-rate mortgage overpayment allowance.
  2. Check the product date or original balance rules.
  3. Confirm how earlier overpayments count towards the allowance.
  4. Review what happens if you exceed the limit.
  5. Use your account-specific details before making an extra payment.

For a fuller comparison of monthly versus lump-sum overpayments, see our building society mortgage overpayment guide.

Moving Home During a Fixed Rate Mortgage

Some building society fixed mortgages are portable, meaning the lender may allow you to transfer the existing mortgage product to a new property.

Portability does not mean the lender automatically approves the new home or borrowing amount. The move usually requires affordability and property checks.

Porting an existing deal

The lender may allow you to retain the fixed rate on qualifying borrowing secured against the new property.

Borrowing more

Additional funds may need a separate mortgage product at a different interest rate.

Borrowing less

Reducing the loan can trigger a partial ERC depending on the contractual allowance.

Timing the move

Some lenders have deadlines or conditions for a sale, purchase and mortgage port to complete.

Before accepting an offer on your home: Ask whether the mortgage is portable, how much can be transferred, whether an ERC applies and what happens if the sale and purchase complete on different dates.

What Happens When Your Fixed Rate Mortgage Ends?

At the end of the agreed fixed-rate period, the mortgage usually moves onto the lender’s applicable variable reversion rate unless you arrange another mortgage product.

That reversion rate can be materially higher or lower than the ending fixed rate. It may also change in future under the lender’s terms.

Do not assume every lender uses the same SVR. Nationwide, for example, distinguishes between its Standard Mortgage Rate and Base Mortgage Rate for certain existing customers. Check the actual rate identified in your own mortgage paperwork.

What to Do Six Months Before Your Deal Ends

  1. Confirm the exact end date. Find it in your mortgage offer, statement or secure account.
  2. Check the outstanding balance. Your current LTV may differ from the LTV when you originally applied.
  3. Request available rates. Ask the current building society about product-transfer options.
  4. Compare the wider market. Review external remortgage options and any incentives.
  5. Check switching fees. Include product fees, legal costs, valuation costs and ERCs.
  6. Choose a suitable completion date. Avoid unintentionally triggering the old product’s ERC.
  7. Review the new offer. Confirm interest rate, fixed end date and monthly payment.
  8. Monitor the rate before the new deal starts. Ask whether a lower available like-for-like rate can replace the reserved product.
Mortgage Charter: Participating lenders have committed to allowing eligible customers to lock in a new deal up to six months before their fixed rate ends and request a better like-for-like deal before it starts, where available. Exact eligibility and processes depend on the lender.

Official FCAFCA Mortgage Charter Information

After opening this link:

  1. Read the Mortgage Charter commitments.
  2. Find the information on reserving new fixed-rate deals before expiry.
  3. Review the like-for-like rate-switch commitment.
  4. Check the separate mortgage-payment support commitments.
  5. Ask your lender which provisions apply to your mortgage.

Product Transfer vs Remortgage: Which Route Should You Choose?

A product transfer means taking a new mortgage deal with your existing lender. A remortgage normally involves moving your mortgage to a different lender.

Product Transfer

  • Remain with your current building society.
  • May involve less paperwork.
  • May not require a new valuation or full affordability reassessment for a straightforward like-for-like switch.
  • Usually avoids external conveyancing work.
  • Limited to products available from your current lender.

Remortgage

  • Move to a different mortgage lender.
  • Can offer a wider choice of products.
  • Usually involves affordability and credit checks.
  • May require valuation and legal work.
  • ERCs and completion timing must be considered.

An internal product transfer can be convenient, but convenience is not the same as best value. Compare the total cost of remaining with your current provider against suitable external offers.

Official YorkshireYorkshire Building Society Product Transfer Guide

After opening this link:

  1. Read the difference between product transfer and remortgage.
  2. Review the process for switching within the same lender.
  3. Check which steps may require further checks or advice.
  4. Compare the convenience of staying against the rate and fee differences.
  5. Check the implications of making other changes, such as borrowing more.

Official Nationwide switchingNationwide Existing Customer Mortgage Switching

After opening this link:

  1. Check your current fixed-rate end date.
  2. Review whether you are eligible to switch through Mortgage Manager.
  3. Check the current switching window.
  4. Compare available rates and any product fees.
  5. Confirm the new product start date before accepting.
Nationwide-specific example: Nationwide currently states that customers with less than four months left on a fixed deal can apply for a new deal through its standard switching route. This is Nationwide’s published process, not a universal four-month rule for all building societies.

Fixed Rate vs Tracker vs Standard Variable Rate

A fixed rate gives repayment certainty for a defined period. A tracker changes according to a reference rate, commonly the Bank of England base rate plus a set margin. A standard variable rate is set by the lender under its mortgage terms.

Mortgage rate type
How the rate behaves
Main consideration
Fixed rate
Stays at the agreed rate during the deal period.
Predictability, but less benefit from falling rates and possible ERCs.
Tracker rate
Moves in line with the specified reference rate plus or minus a contractual margin.
Payments can rise or fall; product charges and collars may apply.
Standard variable rate
The lender can change the rate under its terms.
Often offers flexibility but can be expensive compared with new deals.
Bank of England base-rate changes: They do not directly alter the agreed interest rate on an existing fixed deal. They can affect tracker mortgages and influence lenders’ pricing for new fixed-rate products, but there is no guaranteed one-for-one relationship.

What if You Cannot Afford Your Fixed Mortgage Payments?

A fixed-rate mortgage can still become difficult to afford because of job loss, reduced income, illness or increased household expenses. Waiting until you miss several payments may make the situation harder to manage.

Contact your building society as early as possible. It may offer options depending on the circumstances, including temporary changes to repayments, an agreed term extension or other forbearance arrangements.

Before missing a payment

Explain the problem and ask what temporary or longer-term support is available.

Review essential spending

Prepare accurate income and expenditure details so the lender understands what is affordable.

Discuss possible changes

Ask about the effect of extending the term or changing the repayment arrangement, including future interest costs.

Get independent help

MoneyHelper and free debt advice services can explain options without requiring you to take out another loan.

Official FCA supportFCA: Support for Mortgage Borrowers

After opening this link:

  1. Find the mortgage support section.
  2. Read how different mortgage rate types can affect payments.
  3. Review the available support options.
  4. Contact your lender to discuss your own financial circumstances.
  5. Ask about the costs and consequences of any proposed payment change.

Fixed Rate Mortgage Mistakes That Can Cost You Money

1. Choosing by headline rate alone

The product fee and other expenses can change which mortgage is cheaper.

2. Confusing fix length with mortgage term

A five-year fixed product can sit within a 25-year mortgage.

3. Ignoring ERCs

Selling, remortgaging or making large overpayments can be costly during the fixed period.

4. Leaving the deal to expire unnoticed

The lender’s applicable reversion rate may be much higher than the ending fix.

5. Predicting interest rates with certainty

A rate-cut expectation does not guarantee that suitable mortgage deals will become cheaper.

6. Not checking mortgage portability

Moving home may require a new assessment and could trigger an ERC.

7. Adding fees without checking total interest

A fee added to the mortgage can itself attract interest.

8. Ignoring the full mortgage illustration

It explains the product’s repayments, charges, assumptions and major obligations.

Before Choosing a Fixed Rate Mortgage: Final Checklist

  • Confirm the total mortgage amount.
  • Check the deposit and LTV band.
  • Choose a realistic repayment term.
  • Compare two-year and five-year fixes.
  • Review initial interest rates.
  • Compare product fees.
  • Check cashback and other incentives.
  • Check valuation and legal costs.
  • Read the Early Repayment Charge schedule.
  • Confirm overpayment allowances.
  • Ask whether the mortgage is portable.
  • Check the exact fixed-rate end date.
  • Review the applicable reversion rate.
  • Stress-test future monthly payments.
  • Read the full mortgage illustration.
  • Verify lender authorisation and official application routes.
Practical decision rule: Choose the mortgage that fits your expected time in the property, available deposit, affordability, need for flexibility and overall cost — not simply the lowest percentage shown in an advert.

Related Building-Society.org Mortgage Guides

These published guides can help with specific fixed-rate mortgage decisions and comparisons between borrowing, savings and other mortgage arrangements.

Nationwide Building Society Mortgage Rates 2026 Building Society Mortgage Overpayment Guide Building Society Buy-to-Let Mortgage Guide Building Society Shared Ownership Mortgage Guide Nationwide Building Society: Mortgages, Savings & Help

Official Sources Used for This Fixed Rate Mortgage Guide

For actual mortgage rates and application decisions, use the current lender product page and mortgage illustration. Independent guidance helps explain the risks but does not replace your contractual terms.

MoneyHelper: Mortgage Interest Rate Options MoneyHelper: Repayment and Interest-Only Mortgages MoneyHelper: Mortgage Fees and Costs Nationwide Official Mortgages Nationwide Mortgage Switching Guide Nationwide Mortgage Reversion Rates Yorkshire Building Society Product Transfers Skipton Mortgage Finder FCA Mortgage Charter FCA Mortgage Payment Support
Source-checking approach: Current official guidance was used for the distinction between fixed and variable rates, product transfers, ERCs, overpayments, deal-end arrangements and Mortgage Charter commitments. No temporary lender mortgage interest rate is presented as a universal or guaranteed October 2026 offer.

Editorial Accuracy and Financial Safety Notice

Building-society.org is an independent information website. It is not a mortgage lender, regulated mortgage broker or financial adviser. This guide explains public mortgage information but cannot assess your personal affordability or recommend an individual mortgage product.

Mortgage approval depends on the lender’s own criteria. A mortgage calculator is only an illustration and does not replace a formal mortgage offer, Key Facts Illustration or other required product information.

Verify before applying: Mortgage rates, product fees, affordability criteria, fixed-period lengths, ERCs, overpayment rules and switching deadlines can change. Always check the official lender website and final mortgage illustration. Your home may be repossessed if you do not keep up repayments on your mortgage.

Editorial review: 16 October 2026. Written for borrowers in England, Scotland, Wales and Northern Ireland, with lender-specific differences noted where relevant.

Building Society Fixed Rate Mortgage FAQs

1. What is a building society fixed rate mortgage?

A building society fixed rate mortgage charges an agreed interest rate for a specified period, commonly two or five years. The contractual monthly repayment on a standard repayment mortgage normally remains stable during that period, subject to the mortgage terms.

2. Is a 2-year or 5-year fixed mortgage better?

A two-year fix allows an earlier review of mortgage rates, while a five-year fix provides longer repayment certainty. The better option depends on product fees, future plans, affordability, potential ERCs and the total cost. Neither fixed period is automatically cheaper.

3. Can my building society increase my fixed mortgage rate?

The agreed fixed interest rate normally cannot be increased during the contractual fixed period simply because market interest rates rise. Other contractual changes or charges may affect what you owe. Check your mortgage offer for the specific terms.

4. What happens when my fixed rate mortgage ends?

The mortgage normally moves onto the lender’s applicable variable reversion rate unless you arrange a new product transfer or remortgage. Your monthly repayment may change, so begin comparing options several months before the fixed-rate expiry date.

5. Can I leave a fixed rate mortgage early?

You can usually repay or replace the mortgage before the fixed period ends, but an Early Repayment Charge may apply. The amount depends on your mortgage contract and the date of repayment. Obtain a lender-specific redemption or switching quotation first.

6. Can I overpay a building society fixed rate mortgage?

Many building societies permit limited penalty-free overpayments, often up to 10% annually. However, the allowance calculation, reset date and ERC treatment differ by product. Check your own mortgage offer before making additional payments.

7. Can I move house during a fixed rate mortgage?

Possibly. Some mortgages are portable, allowing an eligible borrower to move the existing product to another property. Porting requires lender approval and may involve affordability and valuation checks. ERCs can apply if the mortgage cannot be transferred or some borrowing is repaid.

8. Are fixed rate mortgage product fees worth paying?

A product fee may be worthwhile when the lower interest rate saves more than the fee and other relevant costs. Compare repayments and total costs over the same period, and check whether the fee is paid upfront or added to the mortgage balance.

9. Can I reserve a new fixed mortgage rate before my current deal ends?

Many lenders allow borrowers to arrange another deal before the existing fixed period expires. Under the Mortgage Charter, participating lenders have commitments relating to reserving a deal up to six months ahead and requesting a better like-for-like rate before the new deal begins. Check your lender’s exact process.

10. Is a building society fixed rate mortgage safer than a tracker mortgage?

A fixed rate provides greater certainty about the contractual interest rate during the fixed period, while a tracker rate can rise or fall with its reference rate. Both involve mortgage repayment obligations and risks. The suitable choice depends on affordability, flexibility, costs and how much payment uncertainty you can manage.

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