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How to Get a Mortgage in Principle in the UK?

A mortgage in principle is a quick way to find out how much you could borrow before you start house-hunting. This guide explains what it is, why it matters, and how to get one. It’s based on current UK mortgage processes and applies to first-time buyers and home movers.

Will Sharman

Oct 6, 2025

What is a mortgage in principle?

A mortgage in principle (also called an Agreement in Principle or Decision in Principle) is a statement from a lender showing how much they might be willing to lend you.

It isn’t a full mortgage offer, but it’s a useful starting point when you’re figuring out your budget. Estate agents also take buyers more seriously when they already have a mortgage in principle.

Why getting one early matters

Getting a mortgage in principle early in your search has clear benefits:

  • It gives you a realistic budget before you view properties
  • It shows sellers and agents you’re a serious buyer
  • It can help spot any credit or affordability issues early
  • It speeds up the full mortgage application later on

What you need before applying

Before you get a mortgage in principle, make sure you’ve gathered some basic information:

  • Personal details (name, address history, ID)
  • Income details (salary, bonuses, other income)
  • Monthly outgoings and any existing debts
  • Deposit amount and rough property price

Lenders use this information to run a soft credit check and estimate how much they may lend.

How to get a mortgage in principle

You’ve got three main ways to do it:

1. Go directly to a lender

Most banks and building societies let you apply online in under 15 minutes. You’ll get a figure showing the maximum they may lend, subject to checks later.

2. Use a mortgage broker

A broker like MBNM can check your situation against multiple lenders at once. This is especially useful if your income isn’t straightforward or you want to avoid unnecessary credit checks.

3. Speak to your own bank

Your current bank might offer a mortgage in principle quickly since they already hold your financial data. It’s often fast, but you may not get the best deal if you only look there.

What happens after you get one

Once you have your mortgage in principle, you can:

  • Start viewing properties within the price range suggested
  • Make offers confidently, knowing you’ve had an initial check
  • Prepare your documents for the full mortgage application stage

Just remember, a mortgage in principle isn’t binding. The lender will do full checks when you apply for the actual mortgage.

How long does a mortgage in principle last?

Most mortgage in principle certificates are valid for 30 to 90 days. If yours expires before you find a property, you can usually renew it easily with updated details.

If your financial situation changes in the meantime (e.g. new job, more debt), the amount offered may change too.

Speak to MBNM

At Mortgage Brokers Near Me (MBNM), we help buyers secure mortgage in principles quickly and with minimal fuss. Our team looks at your situation, matches you with suitable lenders, and guides you through what to expect next.

Whether you’re buying your first home or moving up the ladder, we’ll help you set a clear budget and move confidently. Get in touch with us here.

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Speak to a mortgage adviser

If you’re buying, moving, or remortgaging, speak with a MBNM adviser and get clear guidance on what’s realistically available to you, before you commit to anything.

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