An Agreement in Principle is helpful when you are starting your property search, but it is only the first step. Once your offer has been accepted, the lender needs to look closely at your finances and check that the property is suitable security for the loan.
The exact timing varies between lenders, but MoneyHelper advises that it can take around two to six weeks to find out whether a mortgage has been approved. A straightforward application may be quicker, while a more complex case can take longer.
First comes the Agreement in Principle
Before making an offer, many buyers apply for an Agreement in Principle, also known as a Mortgage in Principle or Decision in Principle. This gives an indication of how much a lender may be willing to lend, based on the details you provide and an initial credit check.
It can often be completed online and returned quickly. Estate agents commonly ask to see one before treating an offer as credible, as it shows that you have started the financial side of the process.
However, an Agreement in Principle is not a guaranteed mortgage. The lender has not yet reviewed your paperwork in full or valued the home you want to buy. The final decision comes later.
If you are still at the offer stage, it is worth making sure your buying position is clear. Our guide to how much below the asking price you should offer in 2026 explains why having an Agreement in Principle, deposit evidence and a realistic timescale can make an offer more attractive to a seller.
What happens after a full mortgage application?
Once your offer has been accepted, you can make your full mortgage application. This is when the lender asks for supporting evidence, usually including payslips, bank statements, proof of identity and proof of your deposit. Self-employed buyers may also need tax calculations, tax year overviews or business accounts.
The lender then carries out affordability and credit checks. It will look at your income, regular outgoings, existing borrowing and the likely cost of the mortgage, rather than relying only on your salary. This is to make sure the borrowing is affordable for your circumstances.
This stage is often called underwriting. If everything is clear and the application is straightforward, it can be relatively quick. If the lender needs to ask questions or verify further information, the process may take longer.
Why a valuation can affect the timeline
Your lender will usually arrange a mortgage valuation before approving the loan. As GOV.UK explains, this is carried out to check the value of the property before the lender approves your mortgage.
The valuation is for the lender’s benefit and is not the same as a full home survey. A remote valuation may be possible in some cases, but a surveyor may need to visit the property. Availability in your area can therefore affect how quickly the application moves.
If the valuation comes back lower than the price you have agreed to pay, it can create a delay. You may need to renegotiate, increase your deposit or speak to your broker about alternative options. A valuation that identifies an issue with the property can also lead the lender to request further reports.
Which applications usually take longer?
Every lender has its own process, but applications can take longer when income is less straightforward. This can include self-employed applicants, contractors, people with commission or bonus income, and buyers with several jobs or other income sources. The lender may need a longer record of earnings before it can be confident about affordability.
Properties can add complexity too. Flats with short leases, listed homes, non-standard construction and properties with structural concerns may need additional checks. A busy lender, delayed valuation or missing document can also slow down an otherwise simple application.
None of these things automatically means that your mortgage will be declined. They simply mean that the lender needs more information before it can issue a formal offer.
How to keep your application moving
The best way to avoid unnecessary delays is to prepare before applying. Gather your documents early and check that names, addresses and income figures are consistent across them. If there are large payments or transfers on your bank statements, be ready to explain where they came from.
It is also sensible to check your credit report before applying. An old address, an electoral-roll error or an account that does not belong to you is easier to resolve before a lender starts its own checks.
Once the application is submitted, reply quickly to requests from your broker, lender or solicitor. A mortgage application can sit waiting for one document or a short clarification, so prompt communication really does make a difference.
The bottom line
Mortgage approval is not usually instant, even if the initial Agreement in Principle is. Most buyers should expect the full process to take a few weeks and should avoid committing to a completion date until a formal mortgage offer is in place.
Good preparation will not remove every delay, but it gives you the best chance of keeping things on track. Have your paperwork ready, be open about your finances and stay in close contact with your broker throughout the process.
.svg){kind=icon}