How remortgaging works

Remortgaging means switching your existing mortgage to a new deal on the same home, either with your current lender (a product transfer) or a new one. Most people do it as a fixed or introductory deal ends, to avoid rolling onto the lender's higher standard variable rate. You can also remortgage to grab a better rate, change the term, or release equity by borrowing more against the home.

Reasons to remortgage, set against what to watch for:

What remortgaging is

Remortgaging is taking out a new mortgage to replace the one you already have, on the same property. You are not moving house and you are not taking on a second loan: you are swapping your current deal for a new one. There are two routes, and the words matter.

• A product transfer. A new deal with your current lender. It is the simpler route, with less paperwork, and as long as you are not borrowing more the lender can usually offer it without a full affordability check.
• A full remortgage. Moving to a different lender. This is treated almost like a fresh application: the new lender checks your income and outgoings and usually revalues the property. It can open up a wider choice of deals, which is why it is worth comparing the two.

Either way you end up on a new deal. The rest of this guide is about why people switch, what it costs, and how to time it. If you want to see what a new rate would do to your monthly payment, our mortgage repayment calculator gives you the figure.

When and why to remortgage

The most common reason is simple timing: your current deal is ending. Fixed and introductory deals usually last two to five years, not the whole mortgage term. When one ends, you move onto the lender's standard variable rate (SVR), a rate the lender sets itself that is normally higher than the deal you were on. Remortgaging onto a fresh deal is how most people avoid that jump.

People also remortgage to:

• Get a better rate. If rates have moved, or your loan-to-value has improved, a new deal may simply cost less.
• Release equity. Borrow more than you currently owe and take the difference as cash, covered in the next section.
• Change the term or set up overpayments. Shorten the term to clear the mortgage sooner, or lengthen it to lower the monthly payment. Our guide to overpaying your mortgage covers paying it down faster.
• Move off interest-only. Switch from paying just the interest to a repayment deal that actually clears the loan.

A tracker deal is a little different: it follows the Bank of England base rate, which the Bank's committee reviews eight times a year, so the payment already moves with that rate. Even so, many people remortgage off a tracker for the certainty of a fixed deal.

Releasing equity explained

Equity is the share of your home you own outright: its current value minus what you still owe on the mortgage. Owe £150,000 on a home worth £300,000 and you have £150,000 of equity. Releasing equity means remortgaging for more than your current balance and taking the extra as a lump sum of cash.

In that example you might remortgage for £180,000, clear the old £150,000 balance and pocket the £30,000 difference. People use it for home improvements, a deposit elsewhere, or to consolidate other debt. The important caveats:

• It is extra borrowing, secured on your home, so you pay interest on it and your monthly payment usually rises.
• The lender will only lend up to a certain loan-to-value, and will run an affordability check on the larger loan.
• Spreading a one-off cost over a long mortgage term can mean paying far more in interest than the cost itself, and your home is at risk if you cannot keep up the larger payments.

How LTV affects your rate

Loan-to-value (LTV) is how much you are borrowing as a percentage of the property's value. It is the single biggest lever on the rate you are offered, because lenders price their deals in LTV bands and reserve the best rates for the lower ones. Our guide to loan-to-value goes through the bands in detail.

Remortgaging is often where LTV works in your favour. Two things tend to move together over a few years: you have paid the balance down, and the property may be worth more than when you bought. Both shrink the loan as a share of the value, so you can drop into a cheaper band and a better rate than you started on. That is also why a higher valuation at remortgage can be good news rather than something to dread. You can check where you sit with our loan-to-value calculator, then feed a likely rate into the mortgage repayment calculator to see the payment.

The costs and the catch

Remortgaging is rarely free, so the question is always whether the saving beats the cost of switching. The usual costs are:

• An early repayment charge (ERC). A fee the lender can apply if you leave your current deal before it ends. Where one applies it is typically 1% to 5% of the balance you repay, often tapering over the deal, so leaving near the end usually costs less. Once your deal has finished there is normally no ERC.
• An arrangement or product fee. A fee on the new deal, sometimes added to the loan rather than paid upfront, in which case you pay interest on it too.
• Valuation and legal work. A new lender values the property and there is legal work to move the mortgage across. Many remortgage deals include free valuation and legals, which removes both, so it is worth comparing the all-in cost rather than just the headline rate.

The other catch is the term. Lengthening it lowers the monthly payment, which can be tempting, but a longer term means more payments and so more interest over the life of the loan. Shortening it does the opposite. Our guide to mortgage repayments shows how the term, rate and balance interact, and the mortgage overpayment calculator shows what paying a little extra saves.

Timing and revaluation

Start early. You can usually line up a new deal up to around six months before your current one ends, and arrange for it to take effect the day the old deal finishes. That avoids slipping onto the standard variable rate in the gap. A mortgage offer is typically valid for several months, which is what gives you that window. Confirm the exact timing with the lender, as it varies.

If you move to a new lender, expect the property to be revalued. The new lender needs a current value to set your LTV, so it arranges a valuation, often a quick desktop or drive-by check rather than a full survey. A product transfer with your existing lender may rely on the value it already holds. A higher valuation can nudge you into a cheaper LTV band, while a lower one can do the reverse, so it is worth a realistic look at what the home is worth before you assume which band you will land in.

Common questions

How does remortgaging work?

Remortgaging means moving your existing mortgage to a new deal on the same home. You can do it two ways: a product transfer, where you take a new deal with your current lender, or a full remortgage to a different lender. A new lender treats it almost like a fresh application, checking your income and outgoings and usually revaluing the property. A product transfer with your existing lender is simpler and, as long as you are not borrowing more, often skips the affordability check. Most people remortgage as their current deal ends, to avoid rolling onto the lender's higher standard variable rate.

When should I remortgage?

The most common time is a few months before your current fixed or introductory deal ends, so the new deal can start the day the old one finishes. If you do nothing, you usually roll onto the lender's standard variable rate (SVR), which is set by the lender and is normally higher. Other reasons to remortgage are to get a better rate, to release equity by borrowing more, to change the term, or to move off an interest-only deal. You can also remortgage mid-deal, but an early repayment charge may apply if you leave before the deal ends.

How does remortgaging give you money?

By releasing equity. Equity is the share of the home you own outright: its value minus what you still owe. When you remortgage you can borrow more than your current balance, secured against the property, and take the difference as cash. Say the home is worth £300,000 and you owe £150,000; you might remortgage for £180,000 and free up £30,000. That money is extra borrowing, so you pay interest on it and your monthly payment usually rises. A lender will only lend up to a certain loan-to-value, and will check you can afford the larger loan.

Is remortgaging a good idea?

It often is when your current deal is ending, because the alternative is the lender's standard variable rate, which is usually higher. The test is whether the new deal saves you more than it costs to switch, once you add up any early repayment charge, arrangement fee, valuation and legal work. Many remortgage deals include free valuation and legals, which helps. If you are extending the term to lower the payment, remember that a longer term costs more interest overall. It is worth running the numbers before you commit.

Does your property get revalued when you remortgage?

Usually, yes, if you move to a new lender. The new lender wants to know what the property is worth now so it can work out your loan-to-value, so it arranges a valuation, often a quick desktop or drive-by check rather than a full survey. A product transfer with your existing lender may use the value it already holds. A higher valuation can be good news: if the home is worth more than when you bought it, your loan is a smaller share of the value, which can move you into a cheaper loan-to-value band.

How soon can you remortgage before your fixed rate ends?

You can usually line up a new deal up to around six months before your current one ends, and arrange for it to start the day the old deal finishes. Starting early gives you time to compare deals and complete the paperwork without slipping onto the standard variable rate in the gap. A mortgage offer is typically valid for several months, which is why lenders let you apply ahead of time. Check the exact window with the lender, as it varies.

What does remortgaging cost?

It depends on the deal, but the usual costs are an arrangement or product fee on the new mortgage, a valuation, and legal work to move the mortgage across, plus possibly an early repayment charge if you leave your current deal early. Many remortgage deals include free valuation and legals, which removes two of those. An early repayment charge, where one applies, is typically 1% to 5% of the balance you repay. Always add the costs up and weigh them against what the new rate saves before switching.

About this article

Written by the calcd team. We build UK money calculators and explain the numbers behind them in plain English. Remortgaging is a process rather than a set of statutory figures, and the rates and fees are set by the market and by individual lenders, so we have kept costs general rather than quoting numbers we cannot pin down. We checked the process, the timing and the early repayment charge points against MoneyHelper, and the base rate context against the Bank of England. The figures and examples here are estimates to help you plan, not financial advice and not a mortgage offer. Your actual rate, fees and how much you can borrow depend on a lender assessing your circumstances, so confirm the details with a mortgage adviser or lender. Last updated June 2026.