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What is a Mortgage Agreement in Principle?

This guide was last updated 13 July 2025

Before you dive into house viewings and Rightmove scrolling sessions, there’s one key step to take, and that’s getting a Mortgage Agreement in Principle.

What is an Agreement in Principle?

An Agreement in Principle (AIP), sometimes called a Decision in Principle (DIP), is a document from a lender that shows how much they’d likely lend you based on a quick assessment of your financial situation.

It’s not a guaranteed mortgage offer, but it’s a great first step in the home-buying process.

Why Do You Need an AIP?

  • Shows sellers and estate agents you’re serious, which is especially useful in competitive areas
  • Gives you a clear budget before falling in love with that dream home
  • Saves time when your offer gets accepted

How Long Does an AIP Last?

Usually between 30 to 90 days. If it expires, don’t panic, we can help you renew it in minutes.

Does an AIP Affect Your Credit Score?

Some lenders do a soft credit check (which doesn’t impact your score), while others do a hard check. At Coreco, we’ll match you with the right option to keep your credit squeaky clean.

Can I Get One If I’m Self-Employed or Have Bad Credit?

Yes! AIPs remain essential, if not more so, and can be obtained regardless of your current status. We ensure the right lender reviews the correct information. Every case is different, and we’re pros at making tricky situations work.

Coreco’s Quick Tip

“An AIP is like your VIP pass to the property market. It shows you mean business, and what is more, we’ll sort it for free.”

Ready to Get Your AIP?

No stress, no silly hoops – just expert advice from real humans who love this stuff.

Book your free AIP chat with Coreco today and get mortgage-ready in minutes.

Andrew Montlake

Written by Andrew Montlake

Andrew Montlake, better known as Monty, began his journey with an Hons degree in Economics & Politics before starting in the mortgage industry in February 1994. As a main founder of Coreco in 2009, he successfully grew the brand, marketing, and communications, and was made MD in 2019 focussing on the overall vision, strategy, and culture of the company. As Coreco’s media spokesperson, Andrew can often be seen or heard on TV and radio as well as regularly commenting in the national, local, and trade press. He is the author of this acclaimed Mortgage Blog and is well-known for his social media, podcasts, and public speaking. Andrew is now proud to serve as Chairman of the Association of Mortgage Intermediaries, (AMI) as a cheerleader for the Mortgage Industry as a whole and continues to work at the coal face, writing mortgage business and advising clients.

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