If you’re thinking about buying a home, one of the first things you’ll probably hear about is a Mortgage Agreement in Principle. You may also see it referred to as a Decision in Principle (DIP) or Mortgage in Principle (MIP). Different lenders use different names, but they all mean the same thing.

An Agreement in Principle is an indication from a mortgage lender of how much they may be prepared to lend you, based on some basic information about your income, outgoings, and financial circumstances. It’s an important first step, but it isn’t the same as a mortgage offer.

For many first time buyers, arranging an Agreement in Principle before they start viewing properties can make the whole process much smoother.

Do I Need an Agreement in Principle?

While you don’t legally need an Agreement in Principle to start looking at properties, it’s something we’d always recommend arranging first.

Knowing what you may be able to borrow means you can focus your property search on homes that fit comfortably within your budget. It can also prevent disappointment if you fall in love with a property that’s outside your borrowing range.

Many estate agents will also ask whether you have an Agreement in Principle before progressing an offer to the seller. Having one already in place shows that you’ve taken steps to arrange your mortgage and are in a stronger position to proceed if your offer is accepted.

As part of our mortgage advice in Bristol, we can usually arrange your Agreement in Principle within 24 hours of your mortgage appointment, helping you start your property search without unnecessary delays.

How Do You Get an Agreement in Principle?

Arranging an Agreement in Principle is usually a straightforward process.

We’ll begin by getting to know your circumstances, including your income, employment, deposit, and any regular financial commitments. We’ll then recommend a lender whose affordability criteria are likely to suit your situation before submitting your details for an Agreement in Principle.

Some lenders use a soft credit search, while others carry out a hard credit search as part of the process. We’ll explain what to expect before anything is submitted, so there are no surprises.

Once your Agreement in Principle has been approved, you’ll know how much a lender may be willing to lend, allowing you to begin your property search with a realistic budget in mind.

How Long Does an Agreement in Principle Last?

Most Agreements in Principle remain valid for between 30 and 90 days, although the exact length depends on the lender.

If you haven’t found a property before it expires, it can often be renewed. Before doing so, it’s worth checking whether anything has changed since your original application, such as your income, employment, or monthly commitments, as these could affect your borrowing.

If you’re actively searching for a home, keeping your Agreement in Principle up to date means you’ll be ready to move quickly when the right property comes along.

Does an Agreement in Principle Guarantee a Mortgage?

No. An Agreement in Principle isn’t a guarantee that your mortgage application will be approved.

Once you’ve had an offer accepted on a property, the lender will carry out a full assessment before making their final decision. This includes reviewing your supporting documents, carrying out a valuation of the property, and making sure you still meet their lending criteria.

Changes to your financial circumstances, information provided during the full application, or the outcome of the property valuation can all affect the lender’s final decision.

Although it isn’t guaranteed, having an Agreement in Principle is still an excellent indication that you’re moving in the right direction.

What’s the Difference Between an Agreement in Principle and a Mortgage Offer?

An Agreement in Principle comes near the beginning of the first time buyer home-buying process. It gives you an indication of how much you may be able to borrow and helps you start viewing properties with confidence.

A mortgage offer comes much later. It’s issued after the lender has fully assessed your application, reviewed your documents, and completed a valuation of the property you’re buying.

In short, an Agreement in Principle helps you start your search, while a mortgage offer allows you to move towards completing your purchase.

When Should You Apply for an Agreement in Principle?

The best time to arrange an Agreement in Principle is before you begin viewing properties.

Having one in place means you’ll already know your budget, making it easier to narrow down your search and act quickly if you find the right home.

It can also put you in a stronger position when making an offer, as sellers and estate agents often prefer buyers who have already started arranging their mortgage.

Even if you’re only just beginning to think about buying a home, speaking to a mortgage advisor early can help you understand your options and prepare for the next steps.

Date Last Edited: July 10, 2026