When your fixed-rate mortgage deal ends you are automatically moved onto your lender's Standard Variable Rate. In May 2026 the average SVR across major UK lenders is approximately 7.5% -- typically two to three percentage points above the best available fixed-rate deals. On a 200,000 pound mortgage, the difference between a 4.3% fixed rate and a 7.5% SVR is approximately 390 pounds per month. Across a year that is 4,680 pounds in unnecessary interest payments. Around 1.5 million fixed-rate mortgage deals expire every year in the UK, and every household that drifts onto SVR without remortgaging is paying this premium. (Source: UK Finance, mortgage statistics May 2026; Bank of England, mortgage lending data)
This guide explains how to time a remortgage, when a product transfer makes more sense than moving lender, how mortgage affordability is reassessed when you remortgage, and the situations where remortgaging is more complex -- including equity release, negative equity, and being a mortgage prisoner.
Product Transfer vs Full Remortgage -- How to Choose
When your deal expires you have two options: a product transfer with your existing lender, or a full remortgage to a new lender. A product transfer means selecting a new deal from your current lender's range without any legal work, new valuation, or credit check -- your lender simply switches the rate on your existing account. This can be completed online in minutes and the new rate takes effect from the day your current deal ends with no gap on SVR.
A full remortgage means moving your mortgage to an entirely different lender. This requires a full affordability assessment, a new valuation (often free), and conveyancing work (solicitor fees typically 200-500 pounds, or free with many deals). The process takes four to eight weeks. The benefit is access to the entire mortgage market -- if your existing lender's product transfer rates are not the best available, a full remortgage may save significantly more over the new deal period. The cost difference should be modelled over the full new deal term, not just the headline rate: a 0.2% lower rate saving on a 200,000 pound mortgage over two years saves approximately 800 pounds before fees. If the remortgage costs 500 pounds in fees and saves 800 pounds in interest, the net saving is 300 pounds -- worthwhile but not dramatic. If the rate difference is 0.5% or more, the saving becomes more compelling. (Source: FCA, consumer mortgage market study; Bank of England data)
When to Start -- The Six-Month Rule
Most lenders allow you to lock in a new rate up to six months before your current deal ends. This is one of the most valuable features of the UK mortgage market: you can secure the rate today with an offer that is valid until your deal expires, and if rates fall further before completion you can switch to a better deal with most lenders without penalty. The risk is one-directional -- if rates rise, your locked rate protects you; if rates fall, you can still benefit. There is no reason to wait until close to your deal expiry date.
Starting six months before also gives you time to fix any issues that emerge during the application process -- a credit file error, an income verification problem, a property valuation that requires further work. Applications submitted too close to the deal end date leave no time for remediation if something goes wrong, and you risk defaulting onto SVR while the issue is resolved. Even if your circumstances are straightforward, the extra time costs nothing and provides significant insurance. (Source: UK Finance, remortgage market guidance)
Tip Set a calendar reminder for six months before your current deal expires. Your deal end date is on your original mortgage offer letter, on your annual mortgage statement, or in your online mortgage account. If you cannot find it, call your lender. The cost of missing your remortgage window and landing on SVR for even two months can exceed the cost of an afternoon arranging a new deal. |
Affordability -- How Lenders Assess a Remortgage
For a straightforward remortgage where you are borrowing the same amount, with the same repayment term, on the same property, most lenders apply a lighter affordability assessment than a new purchase. Some product transfers require almost no affordability checking at all. For a full remortgage to a new lender or for any remortgage that involves borrowing additional money (capital release), full affordability assessment applies including income verification, expenditure review, and stress testing.
The stress test is the critical element. Lenders are required by the FCA to check that you can still afford the mortgage if interest rates rise to a stressed rate -- typically 3% above the product rate, or a minimum floor rate (often around 7% for capital repayment mortgages). If your income has decreased since your original mortgage, if your expenditure commitments have increased significantly (new car finance, higher credit card debt), or if property values in your area have fallen and your LTV has deteriorated, affordability may be tighter than it was at your original application. (Source: FCA, MCOB 11 affordability rules; Bank of England stress testing guidelines)
Remortgaging to Release Equity
If your property has increased in value since your last mortgage, you may be able to borrow additional funds by remortgaging to a higher loan-to-value ratio. This is called capital raising or equity release via remortgage (different from the equity release products aimed at older homeowners). Lenders typically allow capital raising to a maximum of 80-85% LTV, subject to affordability. Common purposes for capital raising include home improvements, debt consolidation (replacing high-interest unsecured debt with mortgage debt), and funding major expenses.
The risks of capital raising deserve careful attention. Extending your mortgage balance increases your total debt, increases your monthly payments unless you extend the term, and extends the period over which you pay mortgage interest. Debt consolidated into a mortgage at 4.3% APR over 15 years costs substantially more in total interest than the same debt repaid as a personal loan at 8% over 5 years, despite the lower monthly payment. The monthly saving is real but the total cost over the full repayment period is higher. Model both the monthly and the total cost before deciding whether consolidation makes financial sense. (Source: FCA, advice on remortgaging for debt consolidation)
Important Remortgaging to release equity for investment purposes -- buying stocks, cryptocurrency, or other assets -- means your home secures the investment. If the investment falls in value or fails, you still owe the additional mortgage. Your home is at risk from investment losses if you cannot maintain the payments. The FCA has highlighted this as a significant consumer risk. Seek regulated financial advice before raising equity for investment purposes. |
Mortgage Prisoners -- When You Cannot Remortgage
A mortgage prisoner is a borrower who is fully up to date with their mortgage payments but cannot remortgage to a better deal because they cannot pass modern affordability assessments. This situation arose primarily for borrowers with pre-2008 mortgages, particularly interest-only mortgages, or loans with closed-book lenders (lenders who no longer offer new mortgages and therefore have no incentive to offer competitive rates). The FCA introduced modified affordability rules in 2021 specifically to help some mortgage prisoners access better deals, creating a pathway for lenders to offer modified affordability assessments to current customers who are paying their mortgage and simply want to switch to a lower rate without increasing borrowing. If you believe you may be a mortgage prisoner, contact the FCA or seek free advice from Citizens Advice or a whole-of-market mortgage broker. (Source: FCA, mortgage prisoner review 2024)
Disclaimer: This article is for information only and does not constitute financial or legal advice. Consult a qualified adviser for guidance tailored to your situation. |
Frequently Asked Questions
What if my property has fallen in value since I bought it?
Negative equity -- where your outstanding mortgage exceeds the property value -- significantly limits remortgaging options. Most lenders will not accept remortgage applications where the LTV exceeds 90-95%. In negative equity, your most practical option is a product transfer with your existing lender, which typically does not require a new valuation. Some lenders operate special negative equity transfer products. If you need to move property and are in negative equity, contact your lender directly -- there are specific schemes and exceptions for genuine hardship situations.
Can I remortgage on an interest-only mortgage?
Yes, but the options are more limited. Many lenders have tightened interest-only criteria significantly since 2008. For interest-only remortgages, lenders require a credible repayment vehicle -- typically an ISA, pension, endowment, or the intended sale of the property on a downsizing basis. The repayment vehicle must be evidenced and valued. Lenders who offer interest-only products in 2026 are fewer than in previous years, and rates may not be as competitive as capital repayment products. (Source: FCA, interest-only mortgage guidance)
Should I fix for 2 years or 5 years?
The right answer depends on your view of where rates are heading and your personal circumstances. In May 2026, the rate differential between 2-year and 5-year fixes at the same LTV is typically 0.1-0.3 percentage points in favour of 5-year fixes. This makes 5-year fixes unusually competitive historically. If you expect rates to fall significantly over the next two years and want flexibility to remortgage sooner, a 2-year fix gives optionality. If you value payment certainty for longer and the rate differential is small, the 5-year fix reduces remortgaging cost and admin over the period. There is no universally correct answer -- it depends on your rate view, your plans for the property, and your appetite for refinancing risk.
Sources
- Bank of England Mortgage Statistics: bankofengland.co.uk
- FCA MCOB Rules: fca.org.uk
- UK Finance Remortgage Data: ukfinance.org.uk
