How does a mortgage application actually work?

Lenders assess two things: whether you can afford the loan and whether the property is adequate security for it. Most of the delay and nearly all of the surprises come from documentation — a missing payslip, an unexplained transfer, a deposit whose source cannot be evidenced. Preparing that in advance changes the experience more than anything else.

Safety

Step by step

1. Get an agreement in principle first.A soft assessment giving an indicative amount. It makes offers credible to agents but it is not a commitment from the lender.
2. Understand affordability assessment.Lenders look at income, committed outgoings, dependants and existing credit, and stress-test the payment against a higher rate. It is not a simple multiple of salary.
3. Prepare the documents before applying.Payslips, bank statements, identity, proof of address, and for the self-employed, accounts and HMRC tax calculations and overviews for several years.
4. Be ready to evidence the deposit.Lenders must establish the source of funds. Savings history, a gift letter from a family member, or sale proceeds. An unexplained large credit will stop the application.
5. Keep your finances stable throughout.No new credit, no new buy now pay later agreements, no changing jobs if avoidable, no unusual transfers. Lenders often recheck before completion.
6. Expect a valuation of the property.The lender values it for security purposes. A down-valuation means either a larger deposit or a renegotiation, and it is a common late problem.
7. Read the mortgage offer conditions.Retentions pending works, requirements about insurance or occupancy, and conditions to satisfy before drawdown. Late-discovered conditions delay exchange.
8. Understand the product terms.Fixed or variable, the length of the deal, the arrangement fee, the early repayment charge and the overpayment allowance. The rate is only part of the cost.
9. Note the offer's expiry.Mortgage offers are valid for a limited period. In a long chain, an extension may be needed and is not always granted automatically.
10. Consider a broker for anything unusual.Self-employment, irregular income, adverse credit, new builds, flats above commercial premises, or non-standard construction. Brokers know which lenders accept what.

Tips

• Do not open any new credit between application and completion, including interest-free instalment plans. Lenders often recheck and it is a frequent cause of a withdrawn offer.
• Get the deposit into one account with a clear history well before applying. Source of funds queries cause more delay than anything else.
• Check your credit file at all three agencies before applying, not after a decline.

Common mistakes

• Treating an agreement in principle as a mortgage — It is an indicative soft assessment. The full application can be declined on documentation, on the property, or on affordability details the AIP never saw.
• Taking new credit during the process — It changes affordability and can trigger a re-check. Lenders do withdraw offers for this, sometimes days before completion.

If it doesn't work

Questions people ask