Requirements · Mortgages
What a mortgage application requires and how the process unfolds
Last updated 25 October 2026 · 2 sources listed · Reading time about 3 minutes
Short answer
The process typically moves from an agreement in principle to a full application, valuation, underwriting and a formal offer. Lenders verify identity, income, outgoings, deposit source and credit history. Preparing documents, keeping finances stable and avoiding unnecessary credit applications reduces delays. Specific requirements and stages vary by country and lender.
Who this is for: A prospective home buyer preparing to apply for a home loan for the first time or after many years.
What to evaluate
Income verification
Lenders need to see stable, documented income to judge affordability.
How to check: Collect recent payslips, tax filings or accounts as requested.
Deposit source
Anti-money-laundering rules require evidence of where the deposit came from.
How to check: Prepare statements showing savings history or gift documentation.
Outgoings and commitments
Existing debts and living costs reduce the amount a lender will offer.
How to check: Reduce unnecessary commitments and list the rest accurately.
Credit history
Missed payments and errors influence both approval and pricing.
How to check: Review your credit report before applying.
Property valuation and survey
The lender needs the property to support the loan, and you need to know its condition.
How to check: Understand the difference between a lender's valuation and a buyer's survey.
Timing and offer validity
Offers expire, and delays can force reapplication.
How to check: Ask how long the offer lasts and what extension is possible.
Comparison
| Stage | What happens | Watch out for |
|---|---|---|
| Agreement in principle | Soft view of likely borrowing | Not a guarantee of final approval |
| Full application | Documents and checks submitted | Hard credit search and detailed scrutiny |
| Valuation | Lender assesses the property | May differ from agreed price |
| Underwriting | Lender reviews risk | Requests for further documents |
| Formal offer | Terms confirmed in writing | Expiry date and conditions |
Decision worksheet
Rate up to three options against this guide’s own criteria. It runs in your browser and saves only on this device. It is a thinking aid, not a recommendation.
1. Have you checked each criterion?
0 of 6 criteria checked.
2. Compare options (0 = fails or unknown, 3 = meets it well)
| Criterion | |||
|---|---|---|---|
| Income verification | |||
| Deposit source | |||
| Outgoings and commitments | |||
| Credit history | |||
| Property valuation and survey | |||
| Timing and offer validity | |||
| Total (max 18) | 0 | 0 | 0 |
Questions to ask before you commit
- Does the agreement in principle involve a hard search?
- Which documents do you need and in what format?
- How is the deposit source verified?
- What costs are payable and when?
- How long is the offer valid?
- What could cause the offer to be withdrawn?
- How will you treat changes in my job or finances before completion?
Typical trade-offs
Using a broker versus applying directly
- Upside
- A broker can compare many lenders and handle paperwork.
- Downside
- Fees or commission structures may influence suggestions; ask how they are paid.
Applying early versus after finding a property
- Upside
- An early agreement in principle strengthens offers.
- Downside
- It can expire and creates a search on your file.
Borrowing at the maximum versus leaving a margin
- Upside
- Maximum borrowing widens property choice.
- Downside
- A thin margin leaves no room for rate rises or surprises.
Common mistakes
- Taking on new credit, such as a car loan, between application and completion.
- Moving large unexplained sums between accounts, which complicates deposit checks.
- Leaving gaps in paperwork until the last moment.
- Not budgeting for valuation, legal, survey and moving costs on top of the deposit.
Related questions
What is an agreement in principle?
It is a lender's indication, based on limited information, of how much it might lend. It helps you shop with confidence and shows sellers you are serious. It is not an offer and can be withdrawn after full checks. Ask whether it involved a hard search and how long it remains valid.
How do lenders decide how much to offer?
They consider income, regular outgoings, existing debts, credit history, deposit size and the property itself. Some use income multiples while others model detailed affordability, including stress tests for higher rates. Different lenders weigh factors differently, so offers vary.
Can I apply to several lenders at once?
Full applications each leave a hard search and may be tracked, so applying to many at once is unwise. Use agreements in principle with soft checks or a broker to narrow the field first, then apply formally to one. Rules and practices vary by country.
What if the valuation is lower than the price?
The lender bases its loan on the valuation, so the shortfall may need to come from your deposit, or you could renegotiate the price. Seek a second opinion from your agent or solicitor. Understand that a valuation is a lender's risk check, separate from a survey of condition.
Sources and further reading
These pages were reachable when we last checked. They informed definitions and rules referred to above; they do not endorse this guide. Where rules differ by country, check the authority for your location.
- Owning a home — Consumer Financial Protection Bureau, retrieved 27 October 2026
- Consumer information and guidance — Financial Conduct Authority, retrieved 27 October 2026
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