Why there is no magic number
The credit scores you see from Experian, Equifax and TransUnion are consumer-facing guides, not the figures lenders use internally. Each mortgage lender feeds your credit file through its own proprietary scoring model and lending policy. The result is that you could be accepted by one lender and declined by another with an identical file on the same day.
What consistently matters across lenders is the underlying history: a track record of paying on time, manageable existing debt relative to your income, stability at your address, and no recent adverse markers. Improve those fundamentals and your consumer score will follow, and so will your access to a wider range of products at more competitive rates.
The three main UK credit reference agencies hold slightly different data because not every creditor reports to all three. Before you apply for a mortgage it is worth checking your file with Experian, Equifax and TransUnion separately. Statutory reports are free; more detailed monitoring services are available on a subscription basis, though the free tiers are usually sufficient for a pre-application review.
What mortgage lenders assess on your credit file
Lenders look well beyond a single score. The table below covers the main factors, why each one matters and what you can do to strengthen it before you apply.
| Factor | Why it matters | Typical impact | How to improve it |
|---|---|---|---|
| Payment history | The single biggest indicator of future reliability | One missed payment can reduce options significantly | Set up direct debits for every credit commitment |
| Existing debt and credit utilisation | High balances suggest stretched finances | Using over 30% of credit limits is a warning sign | Pay down balances; aim for under 25% utilisation |
| Electoral roll registration | Confirms identity and address stability | Missing registration can cause an automatic decline with some lenders | Register at gov.uk/register-to-vote; takes minutes |
| Recent credit applications | Multiple hard searches suggest financial stress | Six or more searches in six months raises lender concern | Avoid new credit for at least three to six months before applying |
| CCJs and defaults | Serious adverse markers signal high default risk | Recent CCJs can block mainstream lenders entirely | Satisfy CCJs; let markers age; use specialist lenders if needed |
| Bankruptcy and IVAs | Most severe marker; flags major past financial difficulty | Discharged bankruptcy is easier to work with than an active one | Wait for discharge; rebuild clean history; save a larger deposit |
| Length of credit history | Longer positive history builds lender confidence | A thin file can be almost as limiting as a poor one | Keep older well-managed accounts open; do not close them |
| Financial associations | A linked partner's poor credit can affect your application | Joint accounts create a credit link with that person | Disassociate from old joint accounts if the relationship has ended |
Most adverse markers remain on your file for six years from the date they occurred, but their impact on lender decisions typically fades after the first two to three years, particularly if you build a clean recent record.
How to improve your credit before applying
Check all three credit files
Request statutory reports from Experian, Equifax and TransUnion at least three to six months before you plan to apply. Look for errors, outdated information and any accounts you do not recognise. Raise disputes promptly; agencies are legally required to investigate within 28 days.
Register on the electoral roll
Visit gov.uk/register-to-vote and confirm you are registered at your current address. This is one of the quickest wins available: many lenders use it as an identity and address-stability check, and some will decline automatically if it is missing.
Pay every bill and credit commitment on time
Set up direct debits for the minimum payment on every account to eliminate the risk of accidental missed payments. If you can, pay in full each month to keep balances low and avoid interest charges, which reduces your overall debt level.
Reduce credit card and loan balances
Aim to bring credit card utilisation below 25% of each card's limit. Paying down a card with a high balance has an immediate positive effect on utilisation, which is one of the fastest-acting changes you can make to your credit profile.
Avoid new credit applications
Every full application for credit leaves a hard search on your file. Pause applications for new credit cards, loans, car finance, overdraft increases or buy-now-pay-later accounts for at least three to six months before you apply for a mortgage.
Close financial associations with old partners
If you have a joint account, joint loan or joint mortgage with someone from a past relationship, contact the credit agencies to file a notice of disassociation once the account is closed. Their credit history will otherwise continue to influence yours.
Credit score benchmarks by agency
Each agency uses a different scale, which can make comparisons confusing. Experian scores run from 0 to 999; a score of 881 or above is rated Excellent and 721 to 880 is rated Good. Equifax scores run from 0 to 1,000, with 531 to 670 considered Good and 811 or above Excellent. TransUnion uses a 0 to 710 scale, with 566 to 603 considered Good and 628 or above Excellent.
These bandings give you a relative sense of where you stand, but they do not map directly onto any lender's accept or decline threshold. A borrower rated Excellent by one agency's consumer tool may still be declined by a lender with particularly strict affordability requirements, while a borrower with a Fair rating may be accepted by a specialist lender that weighs recent conduct heavily.
The most reliable approach is to review the underlying data on your file, correct errors, and then speak to a whole-of-market mortgage broker who can match your profile to the lenders most likely to accept it. Brokers carry out soft searches during the research phase, which do not affect your score.
Getting a mortgage with bad credit
Having adverse credit does not automatically rule out a mortgage, though it does narrow your options and typically raises the cost. Specialist adverse-credit lenders consider applicants with defaults, CCJs, debt management plans and even discharged bankruptcy, usually in exchange for a higher interest rate and a larger deposit, typically 15% to 25% rather than the 5% to 10% available to buyers with clean files.
The more recent and serious the issue, the harder and more expensive borrowing becomes. A single missed mobile phone payment from four years ago has a very different impact from a CCJ entered in the past twelve months. Lenders also assess the overall pattern: isolated incidents are viewed more favourably than a sustained period of difficulty.
A whole-of-market mortgage broker is particularly valuable in adverse-credit situations because they know which lenders accept which blemishes and at what deposit level. Applying directly and being declined adds a hard search to your file, which can compound the problem. A broker soft-searches on your behalf before recommending a lender, protecting your file.
In many cases the most effective strategy is patience: wait for markers to age, build a clean recent payment record, save a larger deposit and, where possible, satisfy any outstanding CCJs. Even twelve months of consistent clean conduct can meaningfully improve your choices.
What to avoid in the months before applying
Multiple credit applications in a short window can lower your score and signal financial stress to lenders. Avoid new loans, credit cards, car finance, overdraft increases and buy-now-pay-later accounts for at least three to six months before your application. Also avoid changing jobs immediately before applying if you can help it, as lenders prefer to see stable employment, and many require you to have passed a probationary period before they will lend.
Soft searches versus hard searches
A soft search, also called a quotation search, is visible only to you on your file and has no effect on your score. Checking your own credit report is always a soft search. Many lenders also use soft searches for mortgage agreements in principle (AIPs), which means you can get a reliable indication of what you can borrow without damaging your credit profile.
A hard search is recorded on your file, is visible to other lenders for twelve months, and can temporarily lower your score by a few points. Hard searches are triggered by a full credit application. A small number of hard searches over a reasonable period is normal and expected, but several within a few weeks can concern lenders who see your file.
When shopping for mortgage rates, use a broker or comparison tool that operates on soft searches during the research phase, and only proceed to a full application with the lender you intend to use. This approach keeps your file clean while you assess your options.