What Is an Agreement in Principle and Why Do You Need One?

Published 26 February 2026 - 2 min read

What is an agreement in principle and why do you need one

n Agreement in Principle (AIP) is often one of the first steps in the home-buying process. It gives you an indication of how much a lender may be willing to lend before you formally apply.

For many buyers exploring first-time buyer mortgages, an AIP provides confidence and clarity before making offers on properties.

Why it matters

Having an AIP can:

  • Show estate agents you are serious
  • Help you understand your budget
  • Identify potential issues early

It is not a guarantee of a mortgage, but it is a useful early step.

When to get one

Most buyers benefit from obtaining an AIP before actively viewing properties, so they can move quickly when they find the right home.

Working with a broker can help ensure your AIP is accurate and based on lenders suited to your situation.

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