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Mortgage in principle

Getting a mortgage in principle

A mortgage in principle (MIP) tells you how much a lender might let you borrow — before you've found a property or made a full mortgage application. It's also called an agreement in principle (AIP) or decision in principle (DIP).

Getting one is free, quick, and won't affect your credit score. Most estate agents will want to see one before they take your offer seriously.

Ashlyn Trojnacki - Mortgage expert
Published by: Mortgage Expert 10 min read | Updated on 01/05/2026
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  • A 100% free MIP and expert mortgage advice when you’re ready to apply

  • Find out your max borrowing potential from across a wide range of lenders

  • A soft search credit check, with no impact on your credit score

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What is a mortgage in principle?

It's not a guaranteed mortgage offer, it's a starting point. You'll still need to complete a full mortgage application once your offer on a property is accepted.

You might also see it called:

  • Agreement in principle (AIP)
  • Decision in principle (DIP)
  • Mortgage promise

They all mean the same thing.

Heads up:
A mortgage in principle isn't legally binding. A lender can still decline your full application if your circumstances change or if their checks reveal something they weren't expecting.

Why do you need a mortgage in principle?

There are 3 good reasons to get one before you start house hunting.

  • Estate agents expect it: Many agents won't let you book a viewing (let alone make an offer) without a mortgage in principle. It proves you're a serious buyer, not a tyre-kicker.
  • It sets your budget: No point falling in love with a property you can't afford. A MIP gives you a realistic ceiling so you can search with confidence.
  • It puts you ahead of other buyers: In a competitive market having your MIP ready when you make an offer can make the difference between getting the house and losing it.

Buying in Scotland? You'll need a mortgage in principle before you can submit a formal bid on a property. Don't skip this step.

Does a mortgage in principle affect your credit score?

No, as long as the lender uses a soft credit check, your credit score won't be affected.

A soft check lets the lender verify your financial history without leaving a mark on your credit report. Other lenders can't see it and it won't count against future applications.

Some lenders still use a hard credit check for a MIP. This does leave a footprint on your credit report, which other lenders can see. Too many hard searches in a short period can lower your score.

Always check which type of check a lender or broker will use before you apply.

When you get your mortgage in principle through our partner, Mojo Mortgages, they only use a soft credit check so there's nothing to worry about.

How to get a mortgage in principle

You can get a mortgage in principle from a broker, bank or any other mortgage lender.

We've partnered with Mojo Mortgages, an online broker, who can get a mortgage in principle sorted for you. Here’s how it works:

  • Fill in a short online form. Share some basic personal information, plus details about your income and expenses.
  • We’ll undertake a soft credit check. Your financial history will be verified without leaving a mark on your credit report.
  • Get your mortgage in principle. You’ll either get a preliminary online mortgage in principle or an expert-verified MIP once you’ve had a chat with a mortgage expert.

What you need to apply

To get a mortgage in principle, the details you'll need to provide are:

  • Your name
  • Date of birth
  • Address history from the past three years
  • Details on your income, including any bonuses
  • Your outgoings, including any debt from credit cards, finances or loans
  • Your current deposit

Your lender uses this information and considers your credit history when working out how much they may be willing to offer you.

How long does a mortgage in principle last?

A mortgage in principle typically lasts 60 to 90 days, depending on the lender.

If your house hunt takes longer than that, your MIP expires, but you can just reapply. This won't affect your credit score if only soft checks are used.

Lender How long your mortgage in principle lasts
Barclays
90 days
Nationwide
90 days
HSBC
60–90 days

Mortgage in principle vs mortgage offer: what's the difference?

These are two very different things, it's easy to get them mixed up.

Mortgage in principle Mortgage offer
What it is
An estimate of what you could borrow
A confirmed agreement to lend you the money
When you get it
Before you find a property
After your full application is approved
Is it binding?
No
Yes
Credit check type
Usually soft
Hard
Based on
Basic financial information
Full financial and property checks

A mortgage offer is what you need to complete a property purchase. A mortgage in principle gets you to the point where you can make a serious offer on a home.

Will I definitely get a mortgage after getting a mortgage in principle?

Not necessarily. A MIP is an estimate, not a guarantee. A lender can still decline your full application if:

  • Your financial circumstances have changed since the MIP was issued
  • The property valuation comes in lower than expected
  • The full credit check reveals something the soft check didn't pick up
  • You can't provide evidence to back up the information you gave (for example, self-employment accounts)

This is why it's important to keep your finances stable between getting your MIP and completing your full mortgage application - avoid big purchases, new credit applications, or changes to your income if you can help it.

Can I get more than one mortgage in principle?

Yes. There's no limit to how many MIPs you can get, provided each lender uses a soft credit check, they won't leave a trace on your credit report.

That said, the smartest approach is usually to go through a broker like our partner, Mojo Mortgages, who can compare options across a wide range of lenders and give you a MIP that reflects your best borrowing potential, rather than applying to lots of lenders individually.

Frequently asked questions

What's the difference between a mortgage in principle and an agreement in principle?

Nothing, they're the same thing. Lenders just use different names. You might also hear it called a decision in principle (DIP). They all refer to an estimate of how much a lender may be willing to lend you before a full mortgage application.

When should I get a mortgage in principle?

Before you start seriously viewing properties. It's the first step of the house-buying process, not something to sort out once you've found a home you want to make an offer on.

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How long does it take to get a mortgage in principle?

It can take as little as 10 minutes online. Some MIPs, particularly those verified by a mortgage expert, may take a little longer.

Does a mortgage in principle guarantee I'll get a mortgage?

No. It's a good indicator, but the lender will carry out more detailed checks when you make a full application. They can still decline you at that stage.

Can I get a mortgage in principle with bad credit?

Possibly, yes, but it'll depend on the severity of the issue and the lender. Getting a mortgage in principle can actually be a useful way to gauge whether a lender is likely to lend to you before you make a full application (which involves a hard credit check).

Do I need a mortgage in principle before making an offer?

Technically, no - but practically, yes. Most estate agents won't take your offer seriously without one.

How much deposit do I need for a mortgage in principle?

There's no set minimum, but most lenders expect at least a 5–10% deposit. The bigger your deposit, the better your chances of approval and the better rates you'll typically be offered.

What our mortgage expert says

"Getting a mortgage in principle early gives you a real advantage. You'll know your budget before you start viewing, you'll be taken seriously by sellers, and you'll move faster when you find the right place. Just make sure you keep your finances stable after getting your MIP, any big changes before your full application could affect the outcome."

Ashlyn Trojnacki - Mortgage expert
Mortgage Expert Confused.com logo

Tips & guides on mortgages

YOU SHOULD THINK CAREFULLY BEFORE SECURING OTHER DEBTS AGAINST YOUR HOME/PROPERTY. YOUR HOME/PROPERTY MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE. 

The Financial Conduct Authority does not regulate mortgages for commercial or investment buy-to-let properties. 

Confused.com is not a mortgage intermediary and makes introductions to Mojo Mortgages to provide mortgage solutions.

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To contact Mojo by phone, please call 0333 123 0012.

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