How remortgaging works: when and why to switch

Updated August 2026

Remortgaging is one of those things most homeowners know they should do but keep putting off. It involves paperwork and there's no exciting viewing or moving day. But switching at the right time can save you hundreds of pounds every single month. Thousands of people are overpaying right now because they didn't get round to it.

What remortgaging actually means

Remortgaging is replacing your current mortgage deal with a new one. You can switch to a new deal with your existing lender (called a product transfer) or move to a completely different lender. The property stays the same. You don't move house. The new mortgage simply pays off the old one, and you start making payments on the new terms.

About 1.6 million UK homeowners remortgage every year according to UK Finance data. It's completely normal and lenders expect it. Your current lender won't be offended. They'll probably try to keep you with a retention offer, which is worth comparing against what other lenders are offering.

When you should remortgage

The most common trigger is your fixed rate deal ending. If you took a 2-year fix in August 2024, it expires in August 2026. When it ends, you automatically drop onto your lender's standard variable rate (SVR), which is typically 7% to 8.5% in the current market. That's a massive jump from whatever your fixed rate was.

But you don't have to wait until your deal actually expires. Most lenders let you secure a new rate 3 to 6 months in advance. If your deal ends in December, you could lock in a new rate as early as June. The new rate doesn't kick in until your current deal expires, but it's reserved for you. And if rates drop further in the meantime, you can usually switch to an even better deal before completion.

Other good reasons to remortgage: your property has increased in value (lower LTV means better rates), you want to borrow more for home improvements, or you want to change from interest-only to repayment.

The remortgaging process step by step

First, check when your current deal ends and whether you'd face early repayment charges (ERCs) for leaving early. Your annual mortgage statement has this information, or log into your lender's online portal. ERCs typically range from 1% to 5% of the outstanding balance in year one of a fix, reducing each year.

Next, get a new agreement in principle. This works the same as when you first bought: a lender confirms they'd likely lend you the amount you need based on a basic check. You can do this with multiple lenders or work through a broker who searches the whole market.

Submit your full application to your chosen lender. You'll need recent payslips (or accounts if self-employed), bank statements, and proof of identity. The new lender will value your property to confirm it's worth enough to support the loan.

A solicitor handles the legal transfer from old lender to new lender. Many remortgage deals include free legal work as an incentive, so you might not pay anything for this. The solicitor redeems your old mortgage (pays it off) and registers the new lender's charge against your property at the Land Registry.

The whole process typically takes 4 to 8 weeks from application to completion. Product transfers with your existing lender are faster since there's no legal work or valuation needed, often completing in 1 to 2 weeks.

What it costs to remortgage

The costs vary depending on the deal you choose and whether you're switching lenders or staying put.

• Product fee (arrangement fee): £0 to £999. Many lenders offer fee-free deals with slightly higher rates. Others charge £999 for their lowest rate. You can usually add the fee to the mortgage balance, though you'll then pay interest on it.
• Valuation fee: £0 to £300. Most remortgage deals include a free valuation. If yours doesn't, expect to pay £150 to £300 depending on property value.
• Legal fees: £0 to £500. Again, most competitive remortgage deals include free conveyancing. If you're using your own solicitor or the deal doesn't include one, budget £300 to £500.
• Exit fee from old lender: £0 to £300. Some lenders charge a deeds release or exit administration fee. Check your mortgage terms.

On many deals, your total cost to remortgage is literally zero: free valuation, free legals, no product fee. These deals exist because lenders want your business. A £180,000 mortgage at 4.5% earns the lender roughly £8,100 in interest per year. They'll happily waive fees to secure that income.

When remortgaging doesn't make sense

If your fixed deal has 18 months or more remaining and the early repayment charge is significant, the maths probably don't work. Say you're 1 year into a 2-year fix and the ERC is 2% on a £200,000 balance. That's a £4,000 penalty. Even if the new deal saves you £100 per month, it takes 40 months to recoup that cost.

Small mortgage balances can also make remortgaging less worthwhile. If you owe £50,000 and the rate difference is 2%, you'd save about £83 per month. But if the new deal has a £999 product fee, it takes 12 months just to break even.

If your circumstances have changed negatively (reduced income, new debts, changed employment status), you might not pass affordability checks with a new lender. A product transfer with your existing lender is usually easier because they don't reassess affordability as strictly for existing borrowers.

A worked example: SVR to new fix

Sarah's 2-year fix ended 3 months ago and she didn't remortgage in time. She's now on her lender's SVR at 7.5%. Her outstanding balance is £180,000 with 20 years remaining.

At 7.5%, her monthly payment is £1,451. She finds a 2-year fix at 4.5% with no product fee, free valuation, and free legal work. Her new monthly payment: £1,139.

That's a saving of £312 per month, or £3,744 per year, or £7,488 over the full 2-year fix. Her total cost to switch: £0. She applies on a Monday, the valuation happens within a week, and she completes 5 weeks later.

Product transfer vs switching lender

A product transfer is the easy option. You stay with your current lender and simply move to one of their new deals. No solicitor, no valuation, no new application. It can complete in days. The downside is you're limited to that one lender's range.

Switching to a new lender takes longer and involves more paperwork, but you get access to the entire market. A broker can search hundreds of deals in minutes and find you the cheapest option accounting for fees, rates, and incentives.

The right choice depends on the numbers. If your current lender's rate is within 0.1% to 0.2% of the best market deal, the convenience might outweigh the small saving. If the difference is 0.5% or more, it's worth the extra effort.

Set your remortgage reminder today

If you're on a fixed deal, find out when it ends. Set a calendar reminder for 4 months before that date. That gives you time to research, apply, and complete before you hit the SVR cliff edge.

If you're already on an SVR, stop reading and start looking. Every month you delay costs you hundreds of pounds in unnecessary interest. There's no penalty for leaving an SVR, no lock-in, no exit charges. You can switch immediately. The only thing stopping you is inertia, and that inertia is expensive.

This is a general guide, not financial advice. For personalised mortgage recommendations, speak to an FCA-regulated mortgage adviser.