One of the first, and most crucial, steps you’ll encounter when buying a home is getting an Agreement in Principle, often abbreviated as AIP.
This document is like a financial compass, guiding you on how much you might be able to borrow for your mortgage.
It’s not a binding offer, but it’s a strong indication of your borrowing power, giving you confidence as you start your property search.
In this guide, we’ll demystify what an Agreement in Principle is, why it’s so important, and walk you through the steps to get one.
By the end, you’ll feel much more prepared to navigate the exciting journey of buying your new home.
What is an agreement in principle?
An Agreement in Principle (AIP) goes by many names, including Mortgage in Principle (MIP), Decision in Principle (DIP), or a Mortgage Promise.
Despite the different names, they all refer to the same thing, a conditional offer from a mortgage lender stating how much they would, in theory, be willing to lend you.
It’s based on an initial assessment of your financial situation, giving you an estimated borrowing amount before you commit to a full mortgage application.
Think of it as a preliminary thumbs-up from a lender.
They’ve taken a quick look at your income, outgoings, and credit history (usually through a soft credit check, which we’ll discuss shortly), and they’ve decided you’re a good candidate for a mortgage up to a certain amount.
This is incredibly helpful because it helps you narrow down your property search to homes within your realistic budget, saving you time and preventing disappointment.
An AIP is not a guaranteed mortgage offer. It’s a non-binding indication.
Lenders will still need to do a full, in-depth check of your finances and the property you wish to buy before they provide a formal mortgage offer.
Why do you need an agreement in principle?
Getting an Agreement in Principle is a recommended first step in the home-buying process, even though it’s not compulsory.
It offers several key benefits that can make your property search much smoother and more effective.
First, an AIP gives you a realistic idea of your budget.
Without one, you might find yourself looking at properties that are well beyond what a lender would be willing to offer, leading to wasted time and potential heartbreak.
I have been here. There is nothing worse than falling in love with a place only to be told by a lender that you can’t afford it.
Knowing your approximate borrowing limit allows you to focus your search on homes you can genuinely afford, making the process more efficient and less stressful.
Second, an AIP demonstrates your seriousness as a buyer to estate agents and sellers.
If you can show an Agreement in Principle, it signals that you’ve already had your finances assessed and are in a strong position to purchase.
Some estate agents won’t even let you view a property unless you can prove you’re proceedable. An AIP helps with that.
It can also give you a significant edge over other potential buyers who might not have an AIP.
If you were a seller choosing between two similar offers, which would you choose?
The one backed by an AIP or the one with no indication the buyer could even afford the house.
I know which I would choose!
Finally, while it’s not a full mortgage offer, having an AIP can sometimes speed up the overall mortgage application process once you find a property.
Because the lender has already done a preliminary assessment of your finances, some of the initial groundwork has been laid.
When you do make a full application, the lender will already have some of your basic information on file, potentially streamlining subsequent checks.
How to get an agreement in principle
Getting an Agreement in Principle is straightforward and usually doesn’t take long.
You have a few options for how to apply. It’s essential to have certain information ready to make the process as smooth as possible.
You can typically apply for an AIP directly with a mortgage lender, such as a bank or building society, either online, over the phone, or in person.
Many lenders offer an online application that can take as little as 10-15 minutes to complete.
Alternatively, you can use a mortgage broker.
A broker can be a great resource as they can assess your financial situation and then search for an AIP from various lenders that are most suitable for your circumstances.
They often have access to a wider range of products than you might find by going directly to a single lender.
Regardless of whether you go direct or use a broker, the process generally involves providing personal and financial details.
The lender will then carry out a soft credit check to get an overview of your credit history.
This type of credit check doesn’t leave a visible mark on your credit file that other lenders can see, meaning it won’t negatively impact your credit score.
This is a key difference from a hard credit check, which is performed during a full mortgage application and does leave a footprint.
Once your application is submitted, you should receive a decision fairly quickly, often instantly if you apply online.
If approved, you’ll receive your Agreement in Principle document, which will state the maximum amount the lender is willing to lend you.
What information do you need for an agreement in principle?
Lenders need to get a clear picture of your financial health to assess how much they might lend you.
Here’s a breakdown of the typical information you’ll need:
- Personal details: This includes your full name, date of birth, and marital status. If you are applying with another person, you’ll need their details too.
- Address history: You’ll usually need to provide your addresses for the last three years. This helps lenders verify your identity and residency history.
- Income details: This is a crucial part of the application. You’ll need to provide accurate information about your employment status and income.
- If you’re employed: Have your latest three months’ payslips ready. Some lenders might ask for six months.
- If you’re self-employed: You’ll typically need your latest two to three years of self-assessment tax returns (SA302s) or certified accounts.
- Other income: If you have any other sources of income, such as benefits, child maintenance, or a private pension, be prepared to provide evidence for these, often through bank statements or award letters.
- Outgoings and financial commitments: Lenders will want to understand your regular expenses and existing debts. This includes details of:
- Any existing loans (e.g., personal loans, car finance).
- Credit card balances and monthly payments.
- Overdrafts.
- Childcare costs.
- Any other significant monthly outgoings.
- Deposit details: You’ll need to state the amount of deposit you have and provide proof of where it’s coming from. This could be bank statements showing savings, or a letter if the deposit is a gift from a family member.
- Property details (if known): While not always essential for the initial AIP, if you already have a specific property in mind, having some details about it (like the approximate purchase price) can be helpful.
Having these documents and details prepared will significantly speed up the application process and help you get your AIP quickly.
Helpful tips for your AIP application
Applying for an Agreement in Principle might seem like a small step, but a little preparation can go a long way.
Here are a few tips to ensure your application is smooth and successful:
- Be accurate and honest: It’s tempting to slightly inflate your income or downplay your outgoings but resist the urge. The AIP is based on the information you provide, and any discrepancies that come to light during the full mortgage application could lead to your application being declined.
- Check your credit report beforehand: While an AIP usually involves a soft credit check, it’s always a good idea to know your credit standing. You can get a free copy of your credit report from agencies like Experian, Equifax and TransUnion.
This allows you to identify any errors and get them corrected before you apply, potentially improving your chances of a higher borrowing limit.
- Consider using a mortgage broker: Especially if your financial situation is a little complex, or if you simply want to compare options from multiple lenders without having to apply to each one individually, a mortgage broker can be incredibly valuable.
They can quickly assess your eligibility with various lenders and help you find the best AIP for your circumstances, often with a soft credit check that won’t impact your score.
Troubleshooting common AIP issues
Even with careful preparation, you might encounter a few snags when applying for an Agreement in Principle.
Don’t worry, many common issues have straightforward solutions.
1. Lower borrowing amount than expected:
- Cause: This could be due to a number of factors, such as higher-than-anticipated outgoings, a lower income assessment by the lender, or even a less-than-perfect credit history.
- Fix: Review your income and outgoings meticulously. Have you forgotten any regular subscriptions or loan repayments? If your credit report has issues, consider working on improving it before reapplying.
You might also speak to a mortgage advisor who can help you understand why the amount is lower and suggest alternative lenders with different criteria.
2. AIP application declined:
- Cause: Being declined usually means there’s a significant issue with your financial profile, such as a poor credit history (e.g., recent defaults, County Court Judgments), insufficient income for the amount you requested, or a high debt-to-income ratio.
- Fix: Ask the lender why your application was declined. This feedback is crucial. Focus on improving your credit score by paying bills on time, reducing debt, and closing unused credit accounts.
If your income is the issue, you might need to save a larger deposit or reconsider your budget. A mortgage broker can be particularly helpful here, as they often have access to specialist lenders who might be more understanding of unique financial situations.
3. AIP expires before you find a property:
- Cause: Most Agreements in Principle are valid for a limited period, typically between 30 and 90 days. If your property search takes longer, your AIP will expire.
- Fix: This is a very common occurrence. You can simply reapply for a new AIP. Unless your financial circumstances have significantly changed, the process should be quick and the outcome likely similar. You don’t have to use the same lender or broker if you wish to explore other options.
Next steps after getting your agreement in principle
Congratulations on getting your Agreement in Principle! This is a significant milestone, but it’s just the beginning of your home-buying adventure.
Here’s what comes next:
- Start your property search with confidence: Now you have a clear idea of your borrowing limit, you can confidently search for properties within your budget. This will save you time and help you focus on realistic options.
Use property websites and engage with estate agents, letting them know you have an AIP to show your seriousness as a buyer.
- Make an offer: Once you find the perfect property, you’ll be ready to make an offer. Having your AIP ready can strengthen your position, as it proves to the seller that you’re in a good financial standing.
- Move to a full mortgage application: If your offer is accepted, the next step is to proceed with a full mortgage application. This is where the lender will conduct more thorough checks, including a hard credit check, and verify all the information you provided for your AIP. They will also arrange for a valuation of the property to ensure it’s worth the price you’re paying.
- Engage a solicitor or conveyancer: You’ll need legal representation to handle the conveyancing process, which involves all the legal work related to transferring ownership of the property.
- Secure your formal mortgage offer: If all checks are satisfactory, the lender will issue a formal mortgage offer. This is a legally binding document that confirms they will lend you the agreed amount under specific terms and conditions.
Conclusion
An Agreement in Principle is a vital early step in the home-buying process, offering a clear indication of your potential mortgage borrowing amount.
It’s often called a Mortgage in Principle or Decision in Principle, and while not a guaranteed offer, it serves as a powerful tool to demonstrate your seriousness to sellers.
It also lets you confidently search for your dream home with a budget in mind, which is equally important.
Take this crucial first step, and you’ll be well on your way to securing your mortgage and unlocking the door to your new property!
Frequently Asked Questions
What is the difference between an Agreement in Principle and a full mortgage offer?
An Agreement in Principle (AIP) is a provisional estimate of how much a lender might lend you, based on an initial review of your finances and a soft credit check. It’s not a guarantee and isn’t legally binding.
A full mortgage offer is a formal, legally binding document from the lender confirming they will provide you with a mortgage for a specific property. This is issued after a comprehensive assessment of your finances, including a hard credit check, and a valuation of the property.
How long does an Agreement in Principle last?
Most Agreements in Principle are valid for a period of between 30 and 90 days. The exact duration can vary between lenders, so it’s always worth checking with the provider. If your AIP expires before you find a property or complete your purchase, you can simply reapply for a new one.
Does getting an Agreement in Principle affect my credit score?
Generally, no. Most lenders perform a “soft” credit check when you apply for an Agreement in Principle. A soft check provides them with an overview of your credit history but doesn’t leave a visible mark on your credit file that other lenders can see.
This means it won’t negatively impact your credit score. However, it’s always wise to confirm with the specific lender or broker if they conduct a soft or hard check, as a hard check would leave a footprint.
Can I get an Agreement in Principle if I have bad credit?
It might still be possible to get an Agreement in Principle even if you have had financial issues in the past. Lenders have different criteria, and some are more flexible or specialise in lending to individuals with less-than-perfect credit.
While a standard high-street lender might decline your application, a mortgage broker can help you explore options with specialist lenders who might be more willing to consider your circumstances.
Do I need an Agreement in Principle before I can view properties?
While it’s not a legal requirement to have an Agreement in Principle to view properties, it is recommended. Many estate agents prefer that potential buyers have an AIP as it demonstrates that you’re a serious buyer and have a realistic idea of what you can afford.
It can also give you an advantage when making an offer, as it shows you’re in a strong position to proceed. In some competitive markets, estate agents may even insist on it.

