What the lender does after your offer is accepted

These are listed in the order worth acting on, which with the mortgage application is not the order they are usually presented in.

From principle to full application

A decision in principle tests you against headline criteria, while the full application is where an underwriter examines the detail sitting behind them. Income, outgoings, credit conduct and the origin of the deposit are all re-checked, and any change since the first look can move the answer.

Applications are submitted either through a broker or directly to the lender, and the documents requested are broadly similar on both routes. Assembling payslips, bank statements and identity documents before an offer is accepted removes several days from the timetable at almost no cost. The application is tied to one property, so an approval attached to a purchase does not simply transfer to the next house if this one collapses.

The valuation is for the lender, not for you

The lender instructs a valuation to confirm the property is adequate security for the sum advanced, which is a much narrower question than whether it is a good buy. The valuer may inspect briefly or work from transaction data alone, depending on the lender, the size of the loan and the type of building.

Where the figure comes in below the agreed price, the lender advances against the lower number and the shortfall becomes something the buyer has to solve. Reports often carry retentions or conditions, holding back part of the advance until specified work such as a roof repair or a damp investigation is done. None of this substitutes for a survey, because a valuation says what a building is worth to a lender rather than what it will cost you to keep standing.

What underwriters actually query

Underwriters look for anything that makes future repayment uncertain: irregular income, a recent change of employer, undisclosed borrowing or spending that suggests strain. Self-employed applicants are generally assessed across several years of accounts, and one strong recent year rarely outweighs a weaker run behind it.

For most people, large or unexplained credits arriving in an account attract questions, since the lender has anti-money-laundering obligations to satisfy before releasing any funds. Existing commitments matter more than most applicants expect, because a car finance agreement or a revolving balance reduces affordability inside the lender's arithmetic. Answering a query fully the first time beats answering narrowly, as every round trip through an underwriting queue tends to cost days rather than hours.

Conditions attached to an offer

A mortgage offer usually arrives with conditions attached, and reading them properly is the difference between a quiet completion and a late scramble. Common conditions include evidence of buildings insurance from the day of completion, proof that a named repair has been carried out, or the closure of a specified credit account. Some conditions must be satisfied before funds are released and others only before the legal commitment point, and a conveyancer will normally identify which is which.

Offers carry an expiry date, and a long chain can outlast one, forcing a fresh application under whatever criteria happen to apply at that later moment. Where a retention applies, the held-back money arrives only once the work is finished, so the buyer must fund that work from savings in the meantime.

Where the delay actually comes from

Most slippage is documentary rather than analytical, caused by a missing statement, an unreadable scan or an address history with an unexplained gap in it. The second common cause sits on the property side: a leasehold information pack that has not arrived, or a valuation that could not be booked quickly. Chasing weekly and in writing creates a record and tends to lift a file inside a queue that is ordered by pressure at least as much as by date.

Brokers earn their money mostly at this stage, because they know which lender is currently slow and which will accept an unusual income shape. Concealing a complication improves nothing, since it surfaces at underwriting anyway and costs more time then than the disclosure would have cost at the start.

If that does not fit your week, it is not a failure of willpower.

When the answer changes late

An offer can be withdrawn if circumstances change materially before completion, which is why taking on new borrowing during a purchase is a poor idea. Some lenders re-run a credit check shortly before releasing funds, and an account opened to buy furniture can undo months of patient work. If a lender declines on the property rather than on the borrower, a different lender with different criteria may still proceed, and a broker will know who.

On an ordinary week, a declined application leaves a footprint, so submitting several full applications at once in the hope that one sticks is usually counterproductive. Lending rules vary widely between countries and change frequently, so treat all of this as general information and confirm the detail with a regulated adviser locally.

Everything above, in order of what to do first

1. From principle to full application. A decision in principle tests you against headline criteria, while the full application is where an underwriter examines the detail sitting behind them.
2. The valuation is for the lender, not for you. The lender instructs a valuation to confirm the property is adequate security for the sum advanced, which is a much narrower question than whether it is a good buy.
3. What underwriters actually query. Underwriters look for anything that makes future repayment uncertain: irregular income, a recent change of employer, undisclosed borrowing or spending that suggests strain.
4. Conditions attached to an offer. A mortgage offer usually arrives with conditions attached, and reading them properly is the difference between a quiet completion and a late scramble.
5. Where the delay actually comes from. Most slippage is documentary rather than analytical, caused by a missing statement, an unreadable scan or an address history with an unexplained gap in it.
6. When the answer changes late. An offer can be withdrawn if circumstances change materially before completion, which is why taking on new borrowing during a purchase is a poor idea.

The takeaway

Send complete documents early, expect the property to be assessed as well as you, and read the conditions on the offer rather than filing it.

Small and repeatable beats ambitious and abandoned, almost every time.