A cheaper home doesn’t automatically mean a cheaper mortgage move. The answer to whether you can port your mortgage to a cheaper property is often yes, but porting isn’t automatic: your lender must approve the new property and reassess your finances. If your mortgage balance is higher than the loan you need, you’ll generally have to repay the difference. For example, a £200,000 balance and a £170,000 loan requirement would leave £30,000 to repay.
It’s understandable to want to keep your existing mortgage deal when moving to a cheaper home. But the price is only part of the picture: you may face an early repayment charge, while valuation or legal fees can add to the cost. Your lender’s rules and the timing of the move also affect the outcome.
This guide explains how mortgage porting works when you downsize, what happens to borrowing you no longer need, and how loan-to-value (LTV) may change. It also covers possible fees and the lender’s assessment, helping you compare the trade-offs before deciding whether porting suits your move.
Key Takeaways
- Porting may let you keep your current mortgage deal when moving, but your lender still assesses your application and the new property.
- If the loan you need is smaller than your current balance, plan for how you’ll repay the difference and whether a charge could apply.
- Compare the potential cost of porting, including relevant fees, with the value of keeping your existing deal.
- Your new home’s value, mortgage balance and deposit or equity all affect loan-to-value, which can influence the options available.
- If your credit history is affecting your move, specialist bad credit mortgage advice can help you understand what may suit your circumstances.
What is mortgage porting?
Mortgage porting means applying to transfer your existing mortgage deal to a new property. It isn’t automatic: your lender assesses your finances and the property before deciding whether to approve the move.
Early repayment charges
An early repayment charge (ERC) is a fee a lender may apply when you repay a mortgage during a deal period. UK mortgage ERCs can vary, with some between 1% and 5% of the outstanding loan. Porting may help you keep the deal, but it doesn’t automatically remove a charge. The amount and conditions depend on your mortgage terms and how much you repay.
Charges when moving to a cheaper property
Moving to a cheaper home can leave you needing a smaller mortgage than your current balance. If you port only part of your borrowing, the amount you repay may exceed your annual overpayment allowance and trigger an ERC. Some fixed-rate deals allow overpayments of up to 10% of the outstanding balance each year, but allowances and how they apply vary by lender and mortgage terms.
For example, with a £200,000 balance and a 10% allowance, you could repay £20,000 without a charge under that allowance. If you need to repay £30,000 to match the smaller loan, the remaining £10,000 is above it and could trigger an ERC. The calculation matters because the charge may apply to the unported borrowing, even if the remaining mortgage deal transfers.
Ask how the lender treats the part you won’t port, and whether it may refund an ERC if the new mortgage completes within its grace period. Also account for valuation and legal fees when weighing the cost of moving. Stamp duty may also apply when buying a home, even if you port your mortgage, according to HM Revenue & Customs.
Residential home porting is distinct from finance for shops, offices and mixed-use property, which involves a different property-finance context.
Can I port my mortgage to a cheaper property?
Yes, you can apply to port your mortgage when downsizing, but approval isn’t automatic. Your lender will assess a new application, including your income, outgoings and credit history, to decide whether the mortgage is affordable.
How mortgage porting works
Porting means applying to transfer your existing mortgage deal to a different property. The lender reviews your circumstances and the new home before deciding whether the deal can move. Your current mortgage terms alone don’t guarantee approval. Changes to your income, regular commitments or credit history since your original application can affect the decision.
Partial porting and repaying the difference
Partial porting means transferring only the part of your mortgage that you still need, then repaying the rest. For example, if your current balance is £150,000 but the cheaper home needs less borrowing, you’ll need to repay the difference. The lender’s rules determine how it treats that repayment, including whether an early repayment charge applies to the amount you don’t port.
Porting when downsizing
The new home’s price and your available deposit or equity help determine how much you need to borrow. The lender also assesses the property as security and checks that the proposed mortgage is affordable. Even if you’re keeping the same deal, both the new property and your financial circumstances form part of the application.
Think of porting as a fresh lending decision linked to an existing deal. Your lender considers the requested loan against your income and outgoings, as well as your credit history. If your circumstances have changed since you took out the mortgage, this reassessment can affect whether you can port and how much you can borrow. The new property must also meet the lender’s requirements.
For help weighing up the application and repayment figures, discuss your home move with Lee Tonks: Mortgage Guru.
Benefits of keeping an existing mortgage deal
Porting may let you keep the terms of your current mortgage deal when you move. That could matter if its rate or structure suits your budget better than a new offer. However, keeping the deal isn’t automatically the cheapest choice: compare its remaining terms with the alternatives for your new property.
One possible benefit is continuity. If your current deal has time left to run, porting may allow you to keep it for the approved borrowing instead of replacing it entirely. The lender still assesses your application, so treat the existing terms as an option to explore, not a guaranteed outcome.
For example, imagine you have a fixed-rate mortgage and are moving before the deal ends. If the lender approves porting, you may keep that rate on the part of the loan transferred. This can make repayments easier to estimate during the move, although the total borrowing and any additional loan may have different terms.
Porting may also mean you don’t need to switch the whole mortgage to a new product just because you’re moving. This matters if the new property requires less borrowing: the amount you keep, the amount you repay and the lender’s treatment of each part shape the overall result. Check your mortgage offer and compare the total borrowing costs.
There’s a trade-off. A lender may treat additional borrowing as a separate loan, sometimes at a higher interest rate. Keeping your original deal could therefore mean managing two parts with different rates or end dates. Comparing their terms side by side gives you a clearer picture than focusing on the headline rate alone.
The existing product may also have features that suit your plans, such as its repayment structure or remaining deal period. The differences between fixed, tracker and variable rates can help explain why the type of deal matters, not just its rate. Lender criteria vary, and a lower rate elsewhere may not fit your circumstances as well.
Before deciding, compare the mortgage offer, repayment terms and any separate borrowing as a package. This makes it easier to assess whether porting could work for your move.
Loan-to-value requirements when downsizing
Loan-to-value (LTV) compares the mortgage with the property’s value, expressed as a percentage. When downsizing, both the new home’s price and the amount you need to borrow affect the calculation. Lenders consider LTV alongside affordability and their own criteria, so a cheaper property doesn’t automatically mean your existing mortgage can transfer unchanged.
For example, a property valued at £200,000 with a £150,000 mortgage has an LTV of 75%. The calculation is £150,000 divided by £200,000, multiplied by 100. This gives a useful starting point for understanding how much of the property’s value is borrowed, rather than owned outright.
For a move, the calculation uses the new property’s value and the mortgage amount requested. If you borrow less against the new home, its LTV could be lower than that of your current property. The lender still assesses the property and your application; its LTV limits and product criteria determine which options are available.
Equity from your existing home can contribute towards the purchase after you account for the mortgage repayment and moving costs. The amount left affects how much you need to borrow. For instance, if the sale proceeds cover more of the new home’s price, the mortgage required may be smaller, changing the proposed LTV.
Consider both the overall LTV and any separate borrowing. A lender may treat additional borrowing as a separate loan with its own terms. If you port only part of the mortgage, assess LTV using the total borrowing secured against the new property, not just the ported portion.
LTV can influence which mortgage products a lender considers, but it isn’t the only factor. Income, outgoings, credit history and the property also matter. A lower LTV doesn’t guarantee approval or a particular rate, and lender criteria differ. A home mover mortgage assessment considers the move as a whole, including the sale, equity and new borrowing.
Compare the new property’s value with the total borrowing requested, then consider how much equity remains after the sale. This gives you a clearer idea of the LTV the lender will assess.
Are early repayment charges payable if you move to a cheaper property and port your mortgage?
They can be. Porting doesn’t automatically remove an early repayment charge (ERC), particularly if downsizing means repaying part of your mortgage. The key distinction is between the borrowing transferred to the new home and the amount repaid rather than ported. Your lender’s mortgage terms determine whether a charge applies.
Even if the full mortgage balance transfers, the lender may charge an ERC under the deal’s conditions. Some lenders refund an ERC already paid if the new mortgage completes within their grace period. Timing matters: a gap between repaying the old mortgage and completing the new one could affect whether a refund is available.
With partial porting, the lender transfers the amount needed for the new property and you repay the remaining balance. That unported amount is most likely to raise an ERC question. For example, downsizing may mean you need a smaller loan than your existing balance, leaving part to repay. The lender’s terms determine whether that repayment triggers a charge.
Check how your mortgage offer defines the porting process. In particular, distinguish an ERC on the unported amount from any charge for repaying the whole mortgage. Find out how the lender calculates the charge, when it’s payable and whether a refund applies after completion. These details help you assess the cost before committing to the move.
An annual overpayment allowance can also affect the calculation. Some UK fixed-rate mortgage deals allow overpayments of up to 10% of the outstanding balance each year, but allowances vary by lender and mortgage terms. Repayment above the allowance could trigger an ERC, depending on the mortgage terms. The allowance and any charge relate to the original deal, so don’t assume porting resets them.
Compare the lender’s written figures for the amount ported, the balance repaid and any ERC or refund. This gives you a clearer view of the mortgage cost alongside moving expenses. Timing also matters: the lender’s completion requirements and grace period can affect whether a charge is refunded.
Lee Tonks: Mortgage Guru: Bad Credit Mortgages
Lee Tonks: Mortgage Guru can help you understand the mortgage options involved in a home move. Independent mortgage advice can clarify how porting, repaying part of a balance and applying for different borrowing fit together. Lender criteria vary, so the right option depends on your circumstances and the property you’re buying.
This is useful when the decision involves more than whether your existing deal is portable. Compare the remaining deal terms, any charge on borrowing you repay, the new home’s value and the mortgage you need. Advice brings these elements together, rather than judging an option by its headline rate alone.
Your finances also form part of the lender’s assessment. Income, regular outgoings, credit history and affordability can all shape the options available. If you’re self-employed or work under CIS, lenders may assess salary, dividends or other income differently. Understanding these differences can help you consider how a fresh application may be viewed.
Credit history deserves attention too. A past default, CCJ or other credit issue may affect which mortgage options a lender considers. Lee Tonks: Mortgage Guru offers advice on Bad Credit Mortgages for people whose credit record is relevant to their application. This doesn’t guarantee approval; it helps put the issue in context alongside the property, deposit or equity, income and affordability.
Advice can also help you weigh alternatives if porting doesn’t suit your circumstances. You might consider a different mortgage route or review how the proposed borrowing and repayments would work after the move. The lowest rate isn’t always the most suitable choice if other terms or lending criteria make another option a better fit.
Lee Tonks: Mortgage Guru provides whole-of-market access, not tied to any lender, and matches clients with FCA-regulated advisers. If you’re planning a move, speaking with a qualified adviser can help clarify the implications of your options before you decide how to proceed.
Check My Mortgage Options
A cheaper home can change how much you need to borrow, the loan-to-value and the balance you may need to repay. Before deciding whether to port, bring these figures together with your current mortgage terms. Lee Tonks: Mortgage Guru can help you understand how they relate to your move and what questions to consider.
Key details include your outstanding mortgage balance, how much you expect to borrow for the new property and any early repayment charge in your mortgage terms. The lender’s valuation, affordability assessment and criteria also matter. Considering these together gives you a more useful comparison than looking at the existing deal’s rate alone.
It’s also worth considering moving costs and timing. For example, a lender may set a deadline for completing the new mortgage if you’re to receive an early repayment charge refund. The amount you port, any part you repay and the new home’s value can all affect the overall picture.
Lee Tonks: Mortgage Guru provides independent mortgage advice across the UK market, matching clients with FCA-regulated advisers. An adviser can help you compare porting with other mortgage options, taking account of your income, outgoings, deposit or equity, credit history and plans. Lenders assess applications differently, and the lowest rate isn’t always the most suitable option.
Use the next step to discuss your move and the figures involved. Focus on what you need the mortgage to do, how much borrowing the new property requires and which terms matter most to you. This is a practical way to explore your options without assuming porting is automatically the right fit.
Information only: This article is general information, not personal mortgage advice. Mortgage availability and lender decisions depend on their criteria and your circumstances.
For guidance on your circumstances and mortgage choices, speak with a qualified adviser through Lee Tonks: Mortgage Guru.
Make your next move with confidence
If you’re still weighing up whether you can port your mortgage to a cheaper property, focus on what you need your mortgage to do after the move. Keeping an existing deal may be one option, but your choice should suit your new home, budget and plans beyond completion. The lender’s decision depends on its criteria and your circumstances.
Set out the questions that matter most to you: how much you need to borrow, how repayments fit your budget and which mortgage terms you value. Clear priorities can make a conversation about your options more focused, especially if your income or credit history has changed since your original application.
Information only: This article is general information, not personal mortgage advice. Mortgage decisions depend on individual circumstances and lender criteria.
A considered decision starts with understanding what suits your circumstances. When you’re ready, discuss your options with a qualified adviser and take the time you need to choose.
Frequently Asked Questions
Are all mortgages portable?
No. Portability depends on your mortgage product, and some UK lenders, including smaller or specialist lenders, don’t offer portable deals. Even if your mortgage has a porting feature, the lender must still approve the move. For example, it may assess the new property and your current finances before agreeing. Read the mortgage offer’s porting conditions to understand the process and any limits.
Are there any circumstances where I won’t be able to port?
Yes. You may be unable to port if your mortgage product isn’t portable, your lender won’t accept the new property or your application doesn’t meet its current criteria. Changes to your income, outgoings or credit history can affect affordability. The amount you need to borrow also matters. For instance, a home that requires more borrowing may involve a separate loan with different terms.
Are there fees involved in moving my mortgage?
Potentially. Legal fees may also apply, and an early repayment charge can arise on borrowing you repay rather than port. Stamp duty may be due on the purchase; the amount depends on the new home’s cost and location. Include these costs when comparing your options.
Can I still port if I don’t sell and buy at the same time?
Possibly. Some lenders allow a grace period between repaying the old mortgage and completing the new one, and may refund an early repayment charge if the port completes within that period. The permitted timing and refund conditions depend on the lender. For example, a delayed purchase could mean completion falls outside the lender’s window, so timing is an important part of the comparison.
Porting vs remortgaging: which is right for you?
Porting may suit you if keeping your existing deal is valuable and the lender approves the move. Remortgaging replaces your current mortgage with a new arrangement, which may have different terms but requires a fresh assessment. Compare overall costs, deal conditions and the borrowing needed, not just the interest rate. A lower rate isn’t automatically the better fit if other terms don’t suit your plans.
What if my lender refuses to port my mortgage?
A refusal doesn’t mean you have no options. First, understand whether the decision relates to affordability, credit history, the property or the requested loan. You could consider whether application details need correcting or whether a different mortgage arrangement may fit. Remortgaging may be another route, but check your existing deal’s early repayment conditions before deciding. Any replacement borrowing remains subject to lender criteria.
Can you port a UK mortgage when moving to a cheaper property?
Yes, you can apply to port when buying a cheaper home if your mortgage product and the lender’s criteria allow it. The new property and your finances are assessed as part of the application. If the home requires less borrowing than your existing balance, account for the amount not transferred and any applicable charge. Compare the borrowing required with your available equity and purchase costs.
What are UK mortgage porting eligibility rules and lender criteria?
Criteria vary by lender. Assessment can include your income, outgoings, credit history, affordability, requested borrowing and the new property. Your home may be repossessed if you do not keep up repayments on your mortgage or any other debt secured against it. Equity released from your home will also be secured against it. Mortgage and protection advice is provided by qualified advisers authorised and regulated by the FCA. Information is based on current lender criteria, which may change. Some types of Buy-to-Let mortgages are not regulated by the FCA.
Information only: This article is for general information and does not constitute personalised financial advice. Mortgage and protection advice is provided by qualified advisers authorised and regulated by the FCA. Information is based on current lender criteria, which may change.
For guidance on your circumstances, explore your options with Lee Tonks: Mortgage Guru.
FCA & Regulatory Disclaimer
The information on this website is based on our understanding of current lender criteria and regulations at the time of writing. Mortgage lending criteria and policies are subject to change, so we recommend speaking directly with a qualified advisor to ensure you receive the most accurate and up-to-date guidance for your situation.
Content provided on this site is for general information purposes only and does not constitute personalised financial advice. All mortgage and protection advice is provided by qualified advisors who are authorised and regulated by the Financial Conduct Authority (FCA). They will offer tailored advice specific to your circumstances.
Please note: some types of Buy to Let mortgages are not regulated by the FCA. Think carefully before securing other debts against your home. Your home may be repossessed if you do not keep up repayments on your mortgage or any other debt secured against it. Equity released from your home will also be secured against it.