The mortgage process: what happens from application to completion

Buying a home is a big milestone, and the mortgage journey can feel like a series of checkpoints—some quick, some more involved. This guide explains the typical stages of the mortgage process in the UK, what each stage is for, and what you can expect to happen next.

1) Initial discussion and affordability planning

The process usually starts with a conversation about your circumstances and goals. This is where your income, outgoings, and any relevant financial details are considered so the mortgage you apply for is realistic.

At this stage, you can also expect to discuss:

• how lenders assess affordability
• the types of mortgages that may suit your situation
• the information you’ll likely need later for an application

The outcome is a clearer picture of the range of borrowing you may be able to support and the next steps.

2) Agreement in Principle (AIP) / decision in principle

An AIP (sometimes referred to as a decision in principle) is an early indication from a lender that they may be willing to lend, subject to further checks.

Key points to understand:

• An AIP is not the same as a mortgage offer.
• It is based on the information provided at the time, and lenders will still carry out further verification later.
• The property and final details still need to be assessed.

Having an AIP can help when making an offer, because it shows you are progressing with a lender’s view of affordability.

3) House hunting with your mortgage in mind

Once you have an AIP, you can start looking with more confidence about your likely borrowing capacity.

During this stage, it’s common to:

• keep your finances stable (major changes can affect later checks)
• be ready to move quickly once you find a suitable property
• prepare for the information your lender will require for the full application

If you’re working with an estate agent, they may ask for confirmation of your position before proceeding with an offer.

4) Full mortgage application

After your offer is accepted, the mortgage process moves into the full application stage. This is where lenders move from an early decision to a more detailed assessment.

A full application typically involves:

• confirming the property details (including the purchase price)
• providing documentation to verify income and identity
• completing lender-specific forms and declarations
• the lender’s underwriting review

Underwriting is the stage where the lender considers the application in detail and decides whether they can proceed.

5) Mortgage offer

If the lender is satisfied with the application, they issue a mortgage offer.

A mortgage offer generally includes:

• the loan amount and interest rate terms
• the repayment method
• conditions that must be met before completion
• the validity period for the offer

It’s important to treat the mortgage offer as a formal document. If anything changes materially between application and completion, it can affect the process.

6) What happens after the mortgage offer: solicitor-led conveyancing

Once the mortgage offer is in place, the focus shifts heavily to the legal side of buying the property.

Your solicitor (or conveyancer) typically handles:

• property searches and enquiries
• reviewing the contract and title information
• coordinating with the lender’s requirements
• exchange of contracts and completion arrangements

While the mortgage offer is a major milestone, completion only happens when the legal process is finished and funds are released.

7) Insurance and lender requirements

Most mortgage lenders require buildings insurance on the property as part of the lending conditions.

In practice, you may also consider additional cover such as:

• life insurance
• critical illness cover

The exact requirements depend on the mortgage product and lender conditions, so it’s helpful to ensure any insurance aligns with what the lender expects.

8) Completion: you become the legal owner

Completion is the point at which the purchase completes and the property ownership transfers.

At this stage:

• contracts have usually been exchanged
• the solicitor confirms completion details
• mortgage funds are released to support the purchase

Once completion has taken place, the property becomes yours, and the mortgage repayments begin according to the agreed terms.

A smooth mortgage process: practical things to keep in mind

While every case is different, the following habits can help the process run more smoothly:

• Keep your finances stable between application and completion.
• Respond promptly to requests for information or documentation.
• Avoid taking on new credit during the mortgage assessment period.
• Plan for timelines—property transactions often have moving parts on both the buyer and seller side.

If you’d like, you can also explore other guides in the Home buyers section for topics such as choosing the right mortgage type, understanding affordability, or preparing for conveyancing.