What happens during a mortgage application?

Applying for a mortgage can feel like one of the most stressful parts of buying a house.

You may have had your offer accepted, started imagining yourself in the property, and then suddenly find yourself gathering payslips, bank statements, ID, deposit evidence and forms.

Then comes the waiting.

The lender needs to check whether they are willing to lend to you, how much they are willing to lend, and whether the property is suitable security for the mortgage.

This guide explains what usually happens during a mortgage application, what the lender is checking, and what you can do to keep things moving.

What is a mortgage application?

A mortgage application is the formal process of asking a lender to lend you money to buy a property.

The lender will look at both:

  • you as the borrower

  • the property you want to buy

They want to understand whether the mortgage is affordable for you, whether your income and outgoings support the borrowing, whether your credit history meets their criteria, and whether the property is worth enough and suitable enough for them to lend against.

If the lender is happy, they will issue a formal mortgage offer.

Mortgage agreement in principle vs full mortgage application

Before making an offer on a property, many buyers get a mortgage agreement in principle.

This is sometimes called:

  • agreement in principle

  • decision in principle

  • mortgage in principle

  • AIP

  • DIP

  • MIP

It gives an indication of how much a lender might be willing to lend, based on the information you provide at that stage.

A mortgage in principle is not the same as a formal mortgage offer.

Once your offer on a property is accepted, you usually need to submit a full mortgage application. This is where the lender checks your documents in more detail and assesses the specific property you want to buy.

When do you apply for the mortgage?

Most buyers apply for the full mortgage once their offer has been accepted.

You may apply directly with a lender or through a mortgage broker.

A broker can help compare lenders, explain options, submit the application and deal with lender questions. This can be especially useful if your circumstances are less straightforward, such as if you are self-employed, have variable income, have recently changed jobs, have credit issues or are buying an unusual property.

What information will you need to provide?

The lender will usually ask for information about your income, spending, debts, deposit and the property.

You may need to provide:

  • proof of ID

  • proof of address

  • payslips

  • P60s

  • bank statements

  • tax calculations or accounts if self-employed

  • details of bonuses, commission or overtime

  • evidence of deposit

  • details of gifted deposit, if relevant

  • credit commitments

  • childcare costs

  • regular outgoings

  • details of the property

  • estate agent details

  • solicitor or conveyancer details

The exact documents will depend on the lender and your circumstances.

It is normal for the lender to ask follow-up questions, especially if something in your income, bank statements or deposit needs clarification.

What does the lender check?

The lender is trying to decide whether the mortgage is suitable and affordable.

They may check:

  • your income

  • your employment status

  • your outgoings

  • your credit history

  • your existing debts

  • your deposit

  • where your deposit came from

  • the loan-to-value ratio

  • the property type

  • the property value

  • whether the property is acceptable security

This does not always happen in a perfectly neat order. Some checks may happen at the same time, and different lenders work in slightly different ways.

What is affordability?

Affordability is the lender’s assessment of whether you can reasonably afford the mortgage.

This is not only about your income.

The lender may also look at your spending, debts, dependants, childcare costs, credit commitments and other regular financial responsibilities.

They want to be confident that you can manage the monthly repayments, both now and if circumstances change.

This is why your bank statements and outgoings may be reviewed as part of the application.

Will the lender do a credit check?

Yes, most mortgage applications involve a credit check.

The lender will use this to understand how you have managed borrowing in the past and whether your credit history fits their criteria.

A full mortgage application may involve a hard credit check, which can show on your credit file.

If you are applying through a broker, they should explain what type of credit check may be carried out and when.

What is a mortgage valuation?

As part of the application, the lender will usually arrange a mortgage valuation.

This is not the same as a house survey.

A mortgage valuation is for the lender. Its purpose is to help them decide whether the property is worth enough for the mortgage and whether it is suitable security for the loan.

The valuation may be carried out in person, remotely, or using automated data, depending on the lender, property and circumstances.

If the lender is satisfied with the valuation and the rest of the application, this can lead towards the formal mortgage offer. NatWest explains that once a valuation has been completed, it will usually lead to the mortgage offer, though timing can vary depending on individual circumstances.

Should you still get a survey?

Yes, you may still want to arrange your own survey.

The mortgage valuation is mainly for the lender’s benefit. It may not give you detailed information about the condition of the property.

A buyer’s survey can help you understand potential issues such as damp, roof problems, structural concerns, electrics, drainage, insulation or other defects.

The right survey depends on the property’s age, condition, type and your level of concern.

What can delay a mortgage application?

Mortgage applications can be delayed for lots of reasons.

Common causes include:

  • missing documents

  • unclear income

  • self-employed income needing extra checks

  • large payments or transfers on bank statements

  • gifted deposit evidence

  • credit history issues

  • property valuation concerns

  • down valuation

  • unusual property type

  • leasehold or title issues

  • lender workload

  • questions from the underwriter

  • changes in circumstances

  • delays confirming solicitor details

Sometimes a delay means the lender needs more information. It does not always mean the application will be declined.

What is underwriting?

Underwriting is the lender’s detailed assessment of the mortgage application.

An underwriter may review your income, documents, credit history, deposit, affordability and the property details.

They may ask for extra documents or clarification before making a decision.

This can feel frustrating because you may feel as though you have already provided everything. But underwriting is a normal part of the process, especially where something needs closer review.

What is a mortgage offer?

A mortgage offer is the formal document from the lender confirming that they are willing to lend you the money, subject to the terms and conditions in the offer.

It will usually include information such as:

  • the amount being borrowed

  • the mortgage product

  • the interest rate

  • the mortgage term

  • monthly payment details

  • fees

  • special conditions

  • how long the offer is valid for

Your solicitor or conveyancer will usually also receive the mortgage offer or lender instructions, because they may need to satisfy lender requirements before completion.

Does a mortgage offer mean the house purchase is guaranteed?

No.

A mortgage offer is a major step forward, but it does not guarantee that the whole purchase will complete.

The legal work still needs to be completed, including searches, enquiries, title checks and exchange of contracts.

In England and Wales, an accepted offer on a property is not usually legally binding until exchange of contracts.

So a mortgage offer is important, but it is still one part of the wider moving process.

What happens after the mortgage offer is issued?

Once your mortgage offer is issued, your solicitor will continue with the legal work.

They may need to check any lender conditions, report to the lender if required, and make sure funds can be requested in time for completion.

You should check the mortgage offer carefully and speak to your mortgage adviser, broker or lender if anything looks wrong or unclear.

You will usually still need to wait until the legal work is complete and everyone is ready before exchange can happen.

What should you keep track of?

During a mortgage application, it helps to keep track of:

  • lender name

  • broker or mortgage adviser details

  • application submission date

  • documents requested

  • documents sent

  • valuation status

  • extra questions from the lender

  • mortgage offer issued date

  • offer expiry date

  • special conditions

  • solicitor details

  • property address

  • deposit evidence

  • gifted deposit paperwork if relevant

Keeping this information together can make the process feel much less scattered.

Questions to ask your mortgage adviser or lender

If you are unsure what is happening, you can ask:

  • Has the full mortgage application been submitted?

  • Have all documents been received?

  • Is the application with underwriting?

  • Has the valuation been booked?

  • Has the valuation been completed?

  • Are there any outstanding questions?

  • Is anything needed from me?

  • Has the mortgage offer been issued?

  • How long is the mortgage offer valid for?

  • Are there any special conditions I need to understand?

Clear questions can help you understand whether the application is moving, waiting or stuck.

Final thoughts

A mortgage application is the lender’s way of checking whether they are willing to lend to you and whether the property is suitable for the mortgage.

They will look at your income, affordability, credit history, deposit, documents and the property valuation before deciding whether to issue a formal mortgage offer.

It can feel slow and stressful, especially when you are waiting for updates or being asked for extra information.

But many of these checks are a normal part of the process.

The best thing you can do is stay organised, respond quickly, keep your documents together and track what is still outstanding.

A mortgage application may feel like a lot, but it becomes easier to manage when you can see what has happened, what is waiting and what needs your attention next.

Disclaimer: This guide is for general information only and mainly applies to buying property in England and Wales. It does not replace advice from your solicitor, conveyancer, mortgage adviser or estate agent.

How Settli can help

Settli helps you keep track of your mortgage application as part of the wider moving process.

You can use Settli to record key contacts, track documents requested, note important dates, keep questions in one place and see what is still waiting.

Your mortgage application is only one part of the move, but it connects to everything else: solicitors, surveys, exchange, completion and your overall timeline.

Settli helps you keep those moving parts together, so you are not trying to manage the whole process through emails, memory and scattered notes.

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