What is an Agreement in Principle (AIP) and why do Estate Agents ask for it?

What is an Agreement in Principle (AIP) and why do Estate Agents ask for it?

Dec 20, 2025

If you have started viewing houses in Cheshire, you have probably already been asked the question: “Do you have an AIP?”

It can feel pushy, but knowing what this document is (and isn’t) is the first step in your property journey.

What is an AIP?
An Agreement in Principle (also called a Decision in Principle or DIP) is a certificate from a lender stating that, in theory, they would be willing to lend you a specific amount.

It is not a guarantee. It is a “soft check” of your credit score and income to see if you pass their basic criteria.

Why do I need one before viewing?
Estate agents ask for this to weed out “window shoppers.”

  1. Proof of Budget: It proves you can actually afford the houses you are looking at.
  2. Speed: If you find a house you love, having an AIP ready means you can make an offer immediately. In a competitive market, an offer with an AIP attached will always beat an offer without one.

Does it affect my credit score?
Most AIPs today involve a “soft search,” meaning it won’t leave a visible footprint on your credit file for other lenders to see. However, always ask your broker to confirm this before running the check.

The Bottom Line:
An AIP is your “ticket to ride.” It doesn’t commit you to that lender, but it allows you to be taken seriously by sellers.

Agreement in Principle blog post image
What is an Agreement in Principle (AIP) blog image

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