Most UK homeowners remortgage every 2-5 years, typically when their fixed-rate deal expires. Done well, a remortgage saves £100-£400 a month vs reverting to your lender's Standard Variable Rate. Done badly — or skipped entirely — it quietly costs thousands. This guide walks through what remortgaging is, when to do it, the choice between a product transfer and switching lenders, the fees involved, and the timing mistakes that catch people out.

What remortgaging means

Remortgaging is taking out a new mortgage on a property you already own. The new mortgage repays the old one, and you start a fresh deal — usually at a new fixed or tracker rate.

Two routes exist:

• Product transfer: A new deal with your existing lender. Quick (1-2 weeks), no affordability check, no new valuation, usually no fees.
• Switching lender: A full new mortgage application with a different lender. Slower (6-12 weeks), requires credit check + valuation, but usually unlocks better rates.

For most homeowners coming off a fix, comparing both options is the single highest-value financial decision they'll make in that 5-year window.

Why remortgaging matters

UK mortgages are almost always fixed for an initial period (2, 3, 5, or 10 years). At the end of that period, you automatically revert to your lender's Standard Variable Rate (SVR). SVRs are typically 2-3 percentage points higher than market fix rates — sometimes more. On a £200,000 mortgage, the gap is £200-£400 a month, or £2,400-£4,800 a year. Over a typical 2-year SVR drift, that's £5,000-£10,000 of avoidable cost.

The remortgage process exists to prevent this. Plan it 4-6 months before your fix ends and you can usually transition straight from one fix to the next without ever touching SVR.

When to remortgage

Fixed-rate deal ending

The most common trigger. Start the process 4-6 months before your fix expires. Most UK lenders let you secure a new rate up to 6 months ahead of completion — and if rates fall in that window, you can usually swap to a better deal before completion.

Substantial property value rise

If your property has risen 10%+ since purchase, your LTV has dropped meaningfully. Remortgaging into a lower LTV band (e.g. from 85% to 75%) typically saves 20-40 basis points on the rate. Worth running the numbers in the remortgage savings calculator even mid-fix.

Rate environment shift

If market rates have dropped 1+ percentage points below your current rate, the saving might cover the ERC of breaking your fix early. Rarely worth it for 0.5pp drops; often worth it for 1.5pp+ drops on the second half of a 5-year fix.

Releasing equity

Many homeowners remortgage to release equity for home improvements, debt consolidation, or a property deposit elsewhere. Treat this as a separate decision — borrowing more isn't free, and the additional amount extends your repayment horizon.

Changing mortgage type

Switching from repayment to interest-only (or vice versa), changing the term, or moving to a tracker — all require a remortgage. See repayment vs interest-only for the trade-off.

Product transfer vs switching lender

Product transfer (existing lender)

• 1-2 week process
• No affordability check
• No new valuation
• No conveyancing fees
• Often a small product fee (£0-£999)
• Limited to your existing lender's available rates
• Right choice if rates are similar and you want speed
• Right choice if your circumstances have weakened (income drop, new debt, credit issue)

Switching lender (full remortgage)

• 6-12 week process
• Full affordability check + hard credit search
• New valuation required (often free)
• Conveyancing fees (£300-£600, often covered by lender 'free legal' offers)
• Product fee (£0-£1,999)
• Access to whole UK market — typically better rates than product transfers
• Right choice if rates differ meaningfully or you've improved credit

Most homeowners save more by switching, but only by 0.1-0.4 percentage points on the new rate. Run the savings calculator to see what each route would cost over the next fix period.

The standard remortgage process (switching lender)

1. 4-6 months before fix expires: Compare market rates. Use a whole-of-market broker for the best access.
2. Get an Agreement in Principle: Soft credit check, indicative rate. See the AIP guide.
3. Submit full application: 3 months payslips, P60, 3 months bank statements, proof of ID, current mortgage statement.
4. Hard credit search + affordability check: Usually completed in 1-2 weeks.
5. Property valuation: Lender's surveyor visits or does desktop valuation. Often free.
6. Mortgage offer issued: Typically 2-4 weeks after application. Valid 6 months.
7. Conveyancing: Simpler than purchase conveyancing — no chain, no SDLT. Usually 4-6 weeks.
8. Completion: New lender pays off old mortgage, you start the new deal. Time this to the day your fix ends if possible.

Costs to budget for

Typical 2026 remortgage costs:

• Product fee: £0-£1,999. Often added to the loan.
• Conveyancing: £300-£600 (often paid by lender via 'free legal' offer).
• Lender valuation: £0-£400 (often free).
• Broker fee: £0-£600. Many brokers are commission-only.
• Early Repayment Charge: Only if breaking the existing fix early. Typically 1-5% of outstanding balance.
• Exit fee from existing lender: £75-£295.

Total typical cost: £400-£1,500 for a standard switch. See remortgage costs explained for the full breakdown.

Common remortgage mistakes

Starting too late

The biggest cost-generator. Leaving it until the fix expires means dropping onto SVR for 2-3 months while paperwork completes. SVR-month-cost on a £200k mortgage is typically £400-£600 of avoidable interest. Start at month -6.

Choosing on rate alone

A lower headline rate with a £1,999 fee might cost more over a 2-year fix than a slightly higher rate with no fee. Always compare total cost over the fix period.

Not using a broker

Whole-of-market brokers see lender products invisible to direct applicants and often unlock 10-20 bps better rates. Commission-only brokers cost the buyer nothing.

Breaking a fix that's nearly over

The ERC in the last few months of a fix is meaningful and almost never recovered by the new lower rate. If your fix ends in the next 6 months, secure a new rate to start at the fix end-date, not break early.

Ignoring affordability changes

If your circumstances have weakened (income drop, new debt, credit issue, change to self-employed), the affordability check on a switch may fail. Product transfer with the existing lender is the safer route — no new affordability check.

Not refreshing your AIP at the right moment

AIPs typically last 30-90 days. If you got one early in the 6-month window, refresh it 4-6 weeks before completion.

Treating product transfer as automatic

Some homeowners assume their lender will just renew the fix automatically. They won't. If you don't take a product transfer or switch, you'll quietly roll onto SVR until you do.

Affordability and credit at remortgage

Switching lenders triggers a full affordability assessment. Lenders look at:

• Current income (employed) or 2-3 years' SA302 (self-employed)
• Existing mortgage payments and other debts
• Monthly outgoings (utilities, transport, subscriptions, dependants)
• Stress test at lender's stressed rate (typically 5.5%+)
• Hard credit check — recent missed payments / defaults visible

If any of these have deteriorated since the original mortgage, consider a product transfer instead. See how much mortgage can I afford for the affordability framework and stress test calculator for the lender's view.

Remortgaging when self-employed

Self-employed remortgages require 2-3 years' SA302s plus tax year overviews. Recent year accounts may need to be certified by an accountant. Some lenders allow remortgaging with 1 year's accounts plus a broker introduction. See the self-employed mortgage guide for full detail.

Remortgaging a buy-to-let

BTL remortgages follow the same broad process but with the additional rental cover test: monthly rent must cover the mortgage interest at a stress rate (typically 5.5% or mortgage-rate-plus-1%) by a multiple of 125-145% for basic-rate taxpayers and 145-165% for higher-rate. See the BTL mortgage costs guide for the rental cover framework.

How remortgaging fits with broader planning

A remortgage is also a natural moment to review:

• Term: Extending the term reduces the monthly payment but adds total interest. Shortening accelerates capital repayment.
• Repayment type: Switching from interest-only to repayment (or vice versa).
• Overpayments: Many fixes allow 10% overpayments per year without ERC.
• Joint vs sole: Adding or removing a borrower is possible at remortgage.
• Buildings insurance: Renewal date often aligns with mortgage anniversary — see home insurance cost guide.

Comparison: typical 2026 remortgage outcomes

To give a feel for what most UK remortgages look like in 2026, here are three typical outcome ranges based on lender market data:

• Standard switch: Saves £100-£250/month vs SVR; total upfront cost £400-£1,200; completes in 8-10 weeks; net 5-year saving £4,000-£12,000.
• Product transfer: Saves £80-£200/month vs SVR; total cost £0-£999; completes in 1-2 weeks; net 5-year saving £3,000-£10,000.
• Stay on SVR (do nothing): Pays £200-£400/month MORE than necessary; "negative saving" of £12,000-£24,000 over a typical 5-year drift period.

The single biggest financial mistake UK homeowners make at fix end is doing nothing. Whatever you choose, choose actively.

Frequently asked questions

What is remortgaging?

Remortgaging is taking out a new mortgage on a property you already own — either with your existing lender (product transfer) or by switching to a new lender. Most UK homeowners remortgage every 2-5 years when their fix ends.

When should I start the remortgage process?

Start 4-6 months before your fix ends. Most lenders let you secure a new rate up to 6 months ahead. Starting late risks dropping onto SVR while paperwork completes.

What's the difference between a product transfer and a remortgage?

Product transfer: new deal with existing lender, no affordability check, no valuation, faster. Remortgage: switch to new lender, full application required, slower but usually unlocks better rates.

What's an early repayment charge?

An ERC is a penalty for repaying during a fixed-rate period. Typical 5% in year one, declining 1% annually. Most lenders waive ERC in the final 3 months of the fix.

Do I need a deposit to remortgage?

No — you remortgage against existing equity. Your LTV is calculated from current property value vs outstanding balance. Rising property value can drop your LTV band and unlock better rates.

Can I remortgage with bad credit?

Possibly but options narrow. Product transfer with existing lender is usually easier than switching, because the existing lender doesn't run a full new credit check. Specialist adverse-credit lenders exist but charge higher rates.

How long does remortgaging take?

Product transfer: 1-2 weeks. Switching lender: 6-12 weeks. Complex cases (self-employed, leasehold) add 1-2 weeks.

What are the common remortgage mistakes?

Starting too late and rolling onto SVR; choosing on rate alone without comparing fees; not using a broker; breaking a fix when ERC outweighs the saving; not refreshing AIP at the right moment.

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Last reviewed: 21 June 2026.