How long does a remortgage take? The realistic timeline
Four to eight weeks lender-to-lender; minutes if you stay put. The six-month advance window means the deadline is almost never the problem — starting late is.
Stage by stage (new lender)
Stage
Typical time
What happens
Decision in principle
Same day
Soft credit check, rate locked on application
Full application
1–3 days
Documents in: ID, payslips or accounts, bank statements
Underwriting
1–3 weeks
Affordability assessed; queries bounce back here
Valuation
Instant–2 weeks
Often automated/desktop for remortgages; physical for unusual properties
Mortgage offer
—
Usually valid ~6 months
Legal work
2–4 weeks
Runs partly in parallel; "free legals" teams are thorough but not fast
Completion
Scheduled
Timed to the day your old deal ends — no overlap, no SVR
The product-transfer shortcut
Staying with your current lender skips underwriting, valuation and legal work entirely: pick a deal from the retention menu online, often in under an hour, effective when your current deal ends. That speed is worth real money when your fix ends next week and the alternative is a month on the SVR — but check the rate you're paying for the convenience.
Work backwards from your end date
6 months out: check the market, lock something. Offers last ~6 months and most lenders let you swap down if rates fall before completion.
2–3 months out: latest comfortable start for a new-lender remortgage.
2 weeks out: re-check rates against your locked deal one final time.
Deal ended, already on SVR: product-transfer today, consider a full remortgage after — every month waiting has a price you can calculate.
Documents. Have ID, 3 months of payslips and bank statements (2+ years of accounts or SA302s if self-employed) ready before applying — this alone removes most of the slack.
Leasehold legals. Flats add lease queries and sometimes management-pack waits; add 2 weeks of margin.
Non-standard property. Anything that forces a physical valuation (unusual construction, recent conversions) adds days to weeks.