One of the most common questions homeowners ask when their fixed deal is approaching its end is simple: how long will this actually take? The honest answer is "it depends," but most straightforward remortgages to a new lender complete within 4 to 8 weeks from application to completion — while a product transfer with your existing lender can take days rather than weeks.
A realistic week-by-week timeline
For a standard remortgage to a new lender, a rough timeline looks like this: weeks 1-2 for comparing rates and submitting a full application with supporting documents; weeks 2-4 for underwriting, credit checks and the property valuation; weeks 3-6 for legal work, including your new lender's solicitor liaising with your existing lender to redeem the old mortgage; and a final completion date agreed once all checks and legal work are finished. Straightforward cases with a cooperative solicitor and no complications can complete faster; more complex cases can take longer.
What speeds the process up
- Having documents ready before you apply — payslips, bank statements, ID and proof of address, ready to upload the moment they're requested
- Choosing a lender with a strong service record for remortgage turnaround times, which can vary meaningfully between lenders
- Using the free legal service many remortgage deals include, since it's often faster than instructing your own separate solicitor
- Responding quickly to any underwriter queries, which are one of the most common causes of unnecessary delay
What can slow it down
Why timing matters more than it might seem
If your current deal is ending and your remortgage isn't complete in time, you'll be moved onto your lender's Standard Variable Rate in the gap — often notably more expensive than either your old or new deal. This is exactly why starting the process 4-6 months ahead, rather than a few weeks before your deal ends, gives you a meaningful buffer against delays. See our guide on what happens when your fixed deal ends for the full picture.
Product transfer: the faster alternative
If speed matters more than squeezing out the very best market rate, a product transfer with your existing lender typically completes far faster than switching lenders, often within days, because it skips full underwriting, a new valuation and much of the legal work. It's worth comparing this against a full remortgage before deciding which route suits your timeline. Our guide on product transfers vs remortgaging explains the full trade-offs.
How offer validity periods interact with timing
Most mortgage offers remain valid for 3 to 6 months once issued, giving you some flexibility if your completion date shifts slightly. However, if your timeline stretches beyond the offer's validity, you may need to request an extension or, in some cases, resubmit updated documents — another reason not to leave the whole process until the last possible weeks.
A practical timeline to work backwards from
- 4-6 months before your deal ends: Start comparing rates and speaking to a broker or lenders directly.
- 3-4 months before: Submit your full application once you've chosen a deal.
- 1-3 months before: Valuation, underwriting and legal work take place.
- On or before your deal's end date: Aim to complete, avoiding any gap on the SVR.
The bottom line
Most remortgages take 4 to 8 weeks once you've applied, but the smart move is starting your comparison 4-6 months before your current deal ends, giving yourself a comfortable buffer against valuation issues, underwriting queries or a busy conveyancer. A mortgage broker can also help keep the process moving and flag likely delays early.