Key facts: A straightforward application typically takes 2–4 weeks from submission to mortgage offer. A decision in principle takes minutes to a day; the valuation is usually the pacing item; and complex income or property issues stretch the timeline more than anything else. The full journey from offer-accepted to completion generally runs 8–14 weeks, dominated by conveyancing.
The timeline, stage by stage
Decision in principle: minutes to a day. Basic checks, usually a soft search — see our mortgage in principle guide.
Full application to offer: 2–4 weeks. The lender underwrites your documents (payslips or accounts, bank statements, ID), runs a hard credit check, and instructs a valuation. Simple employed cases at mainstream lenders sometimes complete in under a fortnight; self-employed and specialist cases run longer.
Offer to completion: dictated by conveyancing. Searches, enquiries and the chain typically take 6–12 further weeks. The mortgage offer itself usually stays valid for 3–6 months.
What actually causes delays
Four culprits account for most slow applications: missing documents (the single biggest — one missing bank statement can add a week per round-trip); complex income — self-employment, bonuses, contractor day rates — which routes you to manual underwriting; valuation issues — down-valuations, surveyor backlogs, or property quirks like non-standard construction; and credit-file surprises the applicant didn't declare. None are fatal; all are faster when anticipated.
How to speed it up
Assemble the document pack before applying: three months' payslips and bank statements (or two years' accounts and SA302s if self-employed), ID, proof of deposit. Check your own credit file first, so nothing surprises the underwriter. And apply to a lender whose criteria you actually fit — the fastest application is the one that doesn't bounce. This is where a broker earns their keep: they know current service levels lender-by-lender (which vary from days to weeks) and pre-package the case so it passes first time.
Need it done quickly?
If your timeline is tight — a seller pressing, a rate expiring — tell the broker up front; they'll route you to lenders currently turning cases around fastest. Get matched with a mortgage broker through Nesto — free, no obligation.
Frequently asked questions
How long from mortgage application to offer?
Typically 2–4 weeks. Simple employed cases can be quicker; self-employed and specialist cases longer.
What's the slowest part of buying a house?
Conveyancing — searches, enquiries and the chain typically take 6–12 weeks after your mortgage offer.
How long does a mortgage offer last?
Usually 3–6 months. If completion slips beyond that, lenders can often extend, or you reapply — new-build purchases commonly need longer validity.
Can a mortgage be approved in a week?
Occasionally, for clean employed cases with documents ready at a fast-moving lender — but plan on 2–4 weeks and treat anything faster as a bonus.