A typical case, week by week
Timelines vary by lender and by season, but a clean limited company purchase with a specialist buy to let lender typically runs like this, for illustration.
| Week | What happens |
|---|---|
| Week 1 | Decision in principle, usually same day to 48 hours. Documents gathered: ID, bank statements, proof of deposit, portfolio schedule if applicable. Full application submitted with fees paid. |
| Week 2 | Valuation instructed and booked. Underwriter's first review, often producing a request list of 2 or 3 further items. |
| Week 3 | Valuation report returned. Underwriter reviews it against the rent used in the affordability calculation. |
| Week 4 | Final underwriting sign off and mortgage offer issued. |
| Weeks 5 to 8 | Conveyancing: searches, enquiries, licensing checks on HMOs, report on title. Exchange of contracts. |
| Weeks 8 to 10 | Completion. On a remortgage the legal stage is far shorter, so completion often lands 1 to 3 weeks after offer. |
The lender's own processing is rarely the bottleneck. Most weeks lost on buy to let cases are lost waiting for documents, valuer availability or answers to legal enquiries.
The five delays that cost the most time
- Incomplete documents at submission. Each round of underwriter queries adds 3 to 7 days. Missing proof of deposit and unexplained large credits in bank statements are the most common culprits.
- Valuation queue and access. In busy periods valuers book 1 to 2 weeks out, and tenanted properties add access coordination. A missed appointment can add a week on its own.
- Down valuations and rent opinions. If the valuer's value or market rent comes in low, the loan is recalculated, and renegotiating or restructuring typically adds 1 to 2 weeks.
- Licensing and compliance on HMOs. Evidence of the licence, room sizes and fire precautions all get checked. An application made without the licence in hand can stall indefinitely.
- Slow third parties in conveyancing. Local search turnaround ranges from days to 6 weeks depending on the council, and on leasehold flats the management pack from the freeholder is a frequent late arrival.
What a delay actually costs
On a remortgage, drift is measurable. A landlord with £150,000 outstanding whose fix has ended sits on a revert rate while the new application completes. At a revert rate of 8.24% against a new 5 year fix at 4.59%, for illustration, the difference is 3.65% a year, which on £150,000 is £5,475 a year or £456.25 a month. A six week delay costs about £684 in extra interest. That is why starting 6 months before the fix ends is the standard advice; the full sequence is in our guide to how a buy to let remortgage works. On purchases the cost of delay is softer but real: lost rent, a seller losing patience, or a rate withdrawal, since lenders reprice ranges with a few days notice.
What makes cases faster
Fast cases share three features. The application goes in complete, with the document list agreed up front so the underwriter's first review is the last. The lender is chosen for the case, since criteria fit, current service levels and whether a desktop valuation is available matter more to speed than a 0.05% rate difference. And the affordability is checked before submission rather than discovered in underwriting; two minutes on our buy to let affordability calculator shows whether the rent supports the loan before any fee is paid. Packaging cases this way is a large part of what a broker does all day, which we set out in our guide to what a commercial finance broker does.
Realistic expectations by case type
For illustration: a simple remortgage with a desktop valuation can offer in under 2 weeks. A standard purchase in a personal name or a clean SPV typically offers in 2 to 4 weeks. HMOs, flats above commercial premises, portfolio landlord cases and applications with historic credit issues typically run 4 to 8 weeks to offer, because more underwriting and often a physical valuation with extra commentary is involved.
Related questions
How long does a buy to let mortgage offer take?
Typically 2 to 4 weeks from full application for a straightforward case, for illustration. Simple remortgages with desktop valuations can be under 2 weeks, while HMOs, portfolio cases and adverse credit cases commonly take 4 to 8 weeks.
How long is a buy to let mortgage offer valid for?
Most lenders issue offers valid for 3 to 6 months, and some run the validity from the original application date. Extensions are often possible but may require re underwriting at current criteria and rates.
What is the single biggest cause of delay?
Incomplete applications. Each round of underwriter queries typically adds 3 to 7 days, and missing proof of deposit or unexplained bank statement entries are the most frequent triggers. Submitting a fully packaged application removes most of the avoidable delay.
Are limited company applications slower?
Slightly, in some cases. The lender reviews the company structure and takes personal guarantees from directors, and the legal work includes the guarantee advice. With a clean SPV set up with standard SIC codes the difference is usually only days.
Can a buy to let purchase complete in 4 weeks?
It is possible with a responsive lender, a desktop valuation, proactive solicitors and no chain, but it is not typical. Where a deadline is genuinely fixed, such as an auction, bridging finance is designed for that speed and a term mortgage follows later.
Talk it through with us
Every case is different. Call us, message us on WhatsApp, or send us the basics and one of our team will come back to you about buy to let applications, usually the same working day.