This guide provides general information and is not a substitute for personalised mortgage, tax or legal advice.
Written and reviewed by the Highhouse Money mortgage team · Last reviewed: 25 August 2026
One of the first questions clients ask is how long the whole thing will take. The honest answer is that it depends on how ready you are, the complexity of your circumstances and the property, and how quickly others in the transaction move.
This guide walks through the usual stages so you know what to expect. It is general information, not financial advice. We offer no fixed timescales because each case, lender and chain differs.
Have these ready to avoid delays
- Photo ID and proof of address
- Recent payslips or accounts
- Recent bank statements
- Evidence of your deposit source
- Details of existing credit commitments
- Your solicitor's contact details
Stage one: initial conversation and fact-find
The process begins with an adviser understanding your income, outgoings, credit history, deposit and plans. This shapes which lenders are suitable. Being open at this stage avoids surprises later, particularly around self-employment, credit issues or unusual income.
Stage two: agreement in principle
An agreement in principle is a lender's indication of what it might lend, usually based on a credit check and basic details. It can often be obtained quickly and is useful when making offers on properties, but it does not guarantee a mortgage.
Stage three: full application and underwriting
Once an offer on a property is accepted, the full application is submitted with supporting documents. An underwriter reviews everything and may ask further questions. This is where incomplete paperwork causes the most delay, so gathering documents early pays off.
Stage four: valuation
The lender instructs a valuation to confirm the property is suitable security. A lower-than-expected valuation, or concerns about construction or condition, can lead to renegotiation or a change of lender. A valuation is not a full survey, so many buyers commission their own.
Stage five: offer, exchange and completion
When the lender is satisfied it issues a formal offer. Your solicitor then completes legal work, you exchange contracts, and on completion day the lender releases funds. The gap between offer and completion is often driven by conveyancing and the chain rather than the mortgage.
Stages at a glance
| Stage | What happens | Common causes of delay |
|---|---|---|
| Fact-find | Circumstances reviewed, options identified | Unclear income or credit history |
| Agreement in principle | Indicative lending decision | Credit file errors |
| Full application | Documents submitted and underwritten | Missing or outdated paperwork |
| Valuation | Property assessed as security | Access issues, down-valuation |
| Offer to completion | Legal work, exchange, funds released | Searches, chain, enquiries |
Indicative stages only; no fixed durations are implied.
This page is general information, not financial advice. Your home may be repossessed if you do not keep up repayments on your mortgage.
Keeping your application moving
- Respond to lender and solicitor requests the same day where possible
- Avoid new credit applications during the process
- Keep bank statements free of unexplained large transfers
- Tell your adviser straight away if your job or income changes
- Book any independent survey promptly after the offer is accepted
Frequently asked questions
How long does it take to get a mortgage offer?
Once a full application and supporting documents are submitted, many straightforward cases receive an offer within a few weeks. More complex income, adverse credit, unusual properties or missing paperwork can extend that. Timescales vary by lender and workload.
How long is a mortgage offer valid for?
Offers are commonly valid for around six months for purchases, though this differs between lenders and can be shorter for remortgages. If completion is likely to be delayed, it is worth checking extension options early.
What slows a mortgage application down most?
Missing or unclear documents are the most common cause, followed by valuation issues, questions about income, and delays elsewhere in the property chain. Responding quickly to lender requests makes a real difference.
Does getting an agreement in principle speed things up?
It helps you act quickly when you find a property and shows sellers you have checked your borrowing position. It is not a formal offer, and the full application still has to be underwritten.
Is the mortgage the slowest part of buying a house?
Often it is not. Conveyancing — searches, enquiries and the chain — frequently takes longer than the mortgage itself. Instructing a solicitor early helps both run in parallel.
Sources and further reading
Where figures or rules can change, the position described is correct at the time of writing (25 August 2026) — always check the linked authoritative source for the latest position.
Related pages
Talk it through with an advisor
Every case is different. A short, no-obligation conversation with a whole-of-market advisor is often the fastest way to understand your options. Call 0345 512 0077 or send us a message.
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