A mortgage Agreement in Principle can involve a credit check, but the type of search is not universal.
Many major UK lenders currently use a soft search at the AIP or Decision in Principle stage and reserve the hard search for the full mortgage application. MoneyHelper warns that some lenders can still use a hard check, so you should confirm the search type before submitting.
Quick Answer (Read This First)
- Soft search: visible to you but generally not visible to other lenders as a credit application.
- Hard search: leaves an application footprint that other lenders can see.
- AIP/DIP: many lenders use a soft search, but do not assume every lender or broker journey is identical.
- Full mortgage application: expect a hard credit search in the normal process.
If the website does not clearly say what search it will run, ask before you press submit.
Why an AIP Checks Your Credit File
An agreement in principle is an early assessment of how much a lender might be prepared to lend.
The lender may use information such as:
- income;
- expenditure;
- deposit;
- address history;
- existing credit;
- electoral-roll data; and
- credit-file information.
That helps it screen obvious eligibility problems before a property and full application are assessed.
An AIP is still not a mortgage offer.
What Is a Soft Search?
A soft search can be used for quotation, eligibility, identity or account-review purposes.
MoneyHelper describes soft searches as checks that do not leave the same visible application mark for other companies.
Current published lender examples include Halifax, Santander and Nationwide using soft searches for their AIP/DIP processes.
That makes it possible to get a useful early indication without necessarily creating a hard mortgage-application footprint.
What Is a Hard Search?
A hard search is associated with an application for credit and is visible to other lenders on your report for a period.
A full mortgage application normally involves a hard search because the lender is making a formal lending decision.
Read our full guide to hard versus soft searches for how the footprints differ.
Why You Should Not Assume Every AIP Is Soft
"AIP", "DIP" and "mortgage in principle" are labels for an early mortgage decision, not a rule defining the credit-search technology behind it.
MoneyHelper specifically says some lenders can use a soft check while others can run a hard check at mortgage-in-principle stage.
The journey can also differ depending on:
- lender;
- broker;
- application route;
- customer type;
- whether the lender already knows you; and
- whether the initial indication turns into a fuller application.
Read the search disclosure on the actual form you are about to submit.
Does a Soft-Search AIP Guarantee the Full Application?
No.
The lender can still decline later because of:
- affordability;
- income evidence;
- undisclosed credit;
- a change in circumstances;
- the property;
- valuation;
- source of deposit;
- fraud checks; or
- full underwriting.
An AIP is useful screening, not approval.
If affordability is the issue, see what to do after a mortgage affordability decline.
Can You Get Several AIPs?
Technically, yes, but there is rarely a reason to submit applications indiscriminately.
If the AIPs are genuinely soft-search only, they do not create the same visible application footprint as several hard searches.
But repeated applications can still create confusion:
- you may enter inconsistent information;
- figures can be calculated differently by each lender;
- you can mistake a higher maximum for a better mortgage;
- and some journeys may not actually be soft-search only.
A broker can often compare lender affordability without submitting a formal AIP to every lender.
What Should You Check Before Pressing Submit?
Look for wording such as:
- "soft credit check";
- "quotation search";
- "does not affect your credit score";
- "not visible to other lenders";
- "hard credit search"; or
- "application search".
If it is unclear, ask:
"Will this AIP create a hard credit-search footprint visible to other lenders?"
That question is more precise than asking whether it "affects my score".
What If You Already Have Several Hard Searches?
Do not panic.
There is no universal published number of hard searches that automatically causes a mortgage decline. Lenders interpret the whole file.
However, multiple recent credit applications can look like increased borrowing activity.
Avoid creating further unnecessary applications and make sure the next mortgage application is targeted to a lender whose criteria fit the case.
Our guide on why credit can be declined despite a good score explains why the consumer score itself is not the decision.
Does Checking Your Own Credit Report Cause a Hard Search?
No.
Checking your own credit report is not the same as applying for a mortgage.
Before an AIP, it is sensible to review all three CRA files for:
- wrong addresses;
- unexpected accounts;
- missed-payment markers;
- defaults;
- financial associations; and
- fraud.
Use our guide to free statutory credit reports.
AIP vs Full Application: The Search Pattern
| Stage | Typical position |
|---|---|
| Affordability calculator | Often no credit search |
| AIP / DIP / mortgage in principle | Often soft, but check lender |
| Full mortgage application | Normally hard |
| Existing-customer review | Depends on lender and action |
| Offer extension/re-underwriting | Can involve another check |
"Typical" is deliberate. Always follow the disclosure for the specific lender journey.
Frequently Asked Questions
Browse all our mortgage guides.
Sources and Further Reading
- MoneyHelper — What happens when I get a mortgage in principle?
- Halifax — Mortgage Agreement in Principle
- Nationwide — Decision in Principle
- FCA Handbook — MCOB
Related: Agreement in Principle Explained | Hard vs Soft Searches | Mortgage Underwriting.
