Low Credit Score Mortgages, What Lenders Really See

What is a low credit score mortgage?

A low credit score mortgage is a residential or buy to let mortgage for a borrower whose credit file contains features that lower their credit score, assessed by a lender that accepts those features. The mortgage itself is an ordinary one, whether it is called a low credit score mortgage or a poor credit score mortgage. Either name refers to the borrower's low score, as shown by a credit reference agency or an app. A score can be low because of genuine adverse credit, such as late payments, defaults or judgments, or because of things lenders weigh quite differently: a thin file with little history, high use of available credit, not being on the electoral roll, or several recent applications. The first group narrows the choice of lenders. The second can often be improved before you apply, the electoral roll and card balances within weeks and a thin file over several months, so the first step towards a mortgage with a low credit score is to establish which group caused it.

There is no minimum credit score for a mortgage in the UK, so the usual question, what credit score do I need for a mortgage, has no single answer. Each agency publishes its own score on its own scale as a guide for consumers. As at October 2026, Experian's runs from 0 to 1,250 (Experian: what is a good credit score) and Equifax's from 0 to 1,000 (Equifax: credit report and score). TransUnion is moving from a scale of 0 to 710 to one of 0 to 999, with score providers switching from September 2026, so for a while you may see two TransUnion scores (TransUnion: support and FAQs). Lenders do not decide on the number you see: TransUnion's own guidance is that they assess the information in your credit report itself. Each lender applies its own scorecard and criteria to that information, and it does not have to publish them.

A mortgage on a home you will live in is normally a regulated mortgage: the legal test is that at least 40% of the property is used as a dwelling (legislation.gov.uk: Regulated Activities Order, article 61), and the lender assesses it under the Financial Conduct Authority's conduct rules (FCA Handbook: MCOB). Most buy to let lending is business lending outside those rules. A buy to let mortgage that is not taken out wholly or predominantly for a business is a consumer buy to let mortgage, with its own regime (legislation.gov.uk: Mortgage Credit Directive Order 2015, article 4). The credit score affects which lenders will consider the case and on what terms, while the rules that apply stay the same. Landlords can see our page on bad credit buy to let mortgages. A new lender reads the file the same way when you switch, which our page on remortgaging with bad credit covers, and our CCJ mortgages page is the place to start for adverse credit in general.

Mortgage Lane arranges mortgages for borrowers with low agency scores, whatever the cause: young applicants and people new to the UK with thin files, borrowers with high credit card use, people recently off the electoral roll or recently moved, those with several recent searches, and those with late payments, defaults, judgments or past insolvency. Most of the work is reading the file behind the score and matching it to a lender whose criteria accept it.

Low credit score mortgage rates

Low credit score mortgage rates are set by each lender, and they follow the credit file the lender sees. A borrower whose file passes a mainstream lender's scorecard and criteria is offered that lender's usual products, priced in loan to value bands like any other case, whatever the agency score. Where the file contains adverse credit outside mainstream criteria, the case goes to a specialist lender, which prices by how serious and how recent the entries are and usually sets a lower maximum loan to value. MoneyHelper says the same of borrowing in general: a poor credit score can mean higher interest rates, lower credit limits or a refusal (MoneyHelper: how to improve your credit score).

Fixing the causes of a low score that are not adverse credit before you apply can often move a borrower from specialist to mainstream pricing. A larger deposit can also put a case in a cheaper loan to value band. Where the file will improve with time, the length of any fixed rate is worth choosing with the next remortgage in mind, so that it ends after older entries have aged; our fixed term mortgages page explains how fixed rates are priced.

Worried about your credit score? Get in touch with your full reports from all three agencies. We read the file the way a lender will and tell you whether the score matters.

Low credit score mortgage criteria

Low credit score mortgage criteria cover the same parts of the credit file on every application, and each lender sets its own limits for them. The credit file rows in the table rest on published sources, as at October 2026: the Information Commissioner's Office (ICO), MoneyHelper and the credit reference agencies' own guidance. The thin file and electoral roll rows describe how lenders differ, and each lender's scorecard and underwriting decide a case. Affordability is a separate test that applies whatever the credit score: on a residential mortgage the lender checks income and outgoings, and on buy to let it tests mainly the expected rent against the mortgage interest, sometimes adding personal income (Bank of England: SS13/16 underwriting standards for buy to let). In Mortgage Lane's experience, applicants with adverse credit are usually limited to around 90% loan to value with the lenders we use, so a 10% deposit is a realistic starting point where the file has adverse entries (90% LTV mortgages covers that band).

Why a credit score is low, and how lenders assess each cause

The same low number can come from quite different files, and lenders look at what caused it.

Genuine adverse credit

Late payments, defaults, county court judgments, arrangements to pay and insolvency lower the score, and lenders read them directly from the file. Most stay for six years: a default from the date of the default, a judgment from the date of judgment, and a bankruptcy or an individual voluntary arrangement from the date it began, even once it has ended (ICO: Credit explained). Lenders place each entry by how recent it is, how serious it is and whether it has been settled, so the age of an entry usually matters more than the score it produces. Our pages on mortgages with missed payments, mortgages with defaults, IVA mortgages and mortgages after bankruptcy cover each type.

County court judgments are the England and Wales form. In Scotland the court equivalent is a decree, and Northern Ireland has its own courts and register, but both reach the credit reference agencies in the same way and stay on the file for six years from the date of the decree or judgment unless paid in full within a month. Our CCJ mortgages page covers the three registers. Insolvency differs between the nations too, with sequestration and protected trust deeds in Scotland in place of bankruptcy and IVAs, and our mortgages after bankruptcy page sets out the differences.

Get in touch with the dates and details of each entry.

A thin credit file

Young applicants, people new to the UK and those who have never used credit have little history for a scorecard to read. A thin file has nothing negative on it, yet a scorecard with little data to work on may still score it low. How lenders treat a thin credit file varies by lender. Some look for evidence of stable income, employment and address instead, and others want to see more history first, so whether a mortgage with no credit history is possible depends on the lender. People who have arrived recently can see our guide to mortgages without UK credit history, and British nationals living abroad our expat mortgages page. First-time buyers will find the schemes in the first-time buyer mortgage guide.

Building some history before applying widens the choice. One way is a credit card, such as a credit builder card, used lightly and repaid in full every month. MoneyHelper suggests a card with a low limit from a regulated provider and registering to vote at your current address, and it warns against products sold as credit building that charge high interest or fees.

Get in touch with your residency and income history.

High credit use

Balances close to credit limits suggest reliance on credit even where every payment is on time. Credit utilisation is the share of your available credit on cards and overdrafts that you are using: £9,000 owed on £10,000 of limits is 90%. Experian suggests keeping it low, especially below 25%, and says loans and mortgages do not count towards it (Experian: credit utilisation ratio). Card balances also count in the affordability check, because lenders allow for a monthly payment on them. The calculator on this page counts 3% of the balance a month, and each lender sets its own figure. Reducing balances before applying helps both the agency score and the lender's scoring. The change shows once the card provider reports the new balance, which Experian says can take around four to eight weeks to reach your report.

Paying balances down from savings is the simplest route. Adding card debt to a mortgage is a separate decision with its own costs and risks, covered on our debt consolidation mortgages page.

Get in touch with your current balances and limits.

Not on the electoral roll

Lenders use the electoral roll to confirm your identity and address. The ICO says that if you are entitled to vote but are not registered, you may find it difficult to get credit, and the agencies count registration in the scores they show you. Credit reference agencies can use the full register when checking applications for credit, so opting out of the open register, the version anyone can buy, does not remove you from their checks (GOV.UK: the open register). Registering online usually takes about five minutes (GOV.UK: register to vote).

Registration takes time to reach the files. Experian says your details should appear on its report within 30 days, except that a registration made during the annual canvass, which it says usually runs from August to November, shows from 1 December (Experian: the electoral roll and your credit score). MoneyHelper says registering could improve your score within eight weeks, because councils send voter data each month. In Northern Ireland registration is with the Electoral Office for Northern Ireland, and there is no annual canvass (GOV.UK: the electoral register).

Not everyone can register: eligibility depends on nationality, immigration status and residence. If you cannot, you can add a short statement to your file explaining why, and some lenders then confirm your identity and address in other ways.

Get in touch once you have registered.

Recent credit applications

Each application for credit leaves a hard credit search on your file, which other lenders can see, and the ICO says lots of searches in a short space of time can imply that you are having problems getting credit (ICO: credit). Experian and Equifax keep hard searches visible to lenders for a year (Experian: data retention periods; Equifax: data retention summary), and TransUnion shows searches for two years. Searches cannot be removed early, but they stop adding up once you stop applying. Spacing applications and using soft-search eligibility checks, which other lenders cannot see, avoids adding more.

Get in touch before making further applications.

Financial associations and errors

A joint account, or a joint application for credit, links your file to the other person's as a financial association, and a lender looking at your file can then see financial information in their name. You should not be linked to anyone just because you live at the same address. Once your finances are separate, for example after a joint account with an ex-partner has closed, you can write to each agency to ask for a disassociation. On a joint mortgage the lender checks both files anyway, and our page on single person mortgages covers applying alone when a partner has adverse credit.

You can dispute errors, such as accounts that are not yours, wrong addresses or late payments that did not happen, with the agency or with the lender that reported them. MoneyHelper says the agency checks with the organisation that supplied the data and marks the entry as disputed while it investigates, and that this should not take longer than 28 days. Under section 159 of the Consumer Credit Act 1974 you can also ask an agency to add a notice of correction of up to 200 words to an entry (legislation.gov.uk: Consumer Credit Act 1974, section 159). If the lender and the agency will not correct an error, you can complain to the ICO.

Get in touch with the entries you think are wrong.

What mortgage lenders actually see

Lenders see the data on your credit file, not the score shown in your app. The file shows each account, its limit and balance, up to six years of monthly payment history, defaults, county court judgments, insolvencies, searches, electoral roll entries, linked addresses and financial associations. The lender's scorecard weighs these items according to its own experience of which borrowers repay, and its underwriters then apply its criteria, such as a rule on defaults in the last three years. The ICO explains that each lender has its own scoring system and its own pass mark, so you may be refused by one lender and accepted by another. Lenders do not have to tell you how their scoring works, but if you ask they must tell you which agency they used.

The agencies hold separate files, and not every lender reports to all of them. The FCA's credit information market study found that the three large agencies held consistent information on the number of defaults for only around 30% of the people it matched, partly because some firms do not share data with all three. The same study heard that consumers tend to focus on their scores while lenders often examine the underlying credit information (FCA: Credit Information Market Study, December 2023). This is why one lender can accept a file that another declines, and why an agency score, which is one agency's estimate, is only a rough guide. MoneyHelper lists Crediva as a fourth agency alongside Experian, Equifax and TransUnion, and suggests getting your report from each of them if you have not checked it for some time, because their information can differ. Every agency must give you your statutory credit report free (MoneyHelper: how to check your credit report).

A score is also only one part of a decision: a lender can decline on affordability, the property or its own policy. Our guides to a mortgage declined on credit score, a credit score of 999 but a refused mortgage, an excellent credit score but a refused mortgage and a bad credit mortgage declined look at the same point from the other side, and our declined mortgages page covers what to do after a refusal.

What raises a lender's view of your credit file

Most of the causes of a low score that are not adverse credit can be improved before an application, and each change takes time to reach the files. To improve your credit score for a mortgage, start with the free statutory report from each agency, because the agencies hold different data. Adverse entries such as defaults improve only with time. A notice of correction explaining an entry does not change your score, and MoneyHelper notes that lenders read it manually, which can slow an application.

The statutory report shows the data a lender sees. It is a different product from the score in an app, and TransUnion points out that its statutory report does not include a score at all. Each change reaches the files on its own timetable. Building history on a thin file, for example with a credit builder card, takes several months, so it comes first where it applies. Among the administrative fixes the slowest go first: registering to vote and paying balances down usually take the longest to show, disputes and requests for disassociation can run alongside them, and new applications stop. On the agencies' published timings, a borrower planning to apply in three months should see most of these administrative changes on the files by then. The exception is a new electoral registration made during the annual canvass, which Experian says will not show until 1 December.

Soft and hard searches

A soft search is visible only to you and does not affect lender scoring; a hard search is recorded on your file and seen by other lenders. MoneyHelper describes a soft search as visible only to you and the agency, so it does not affect your score. Checking your own report, an identity check and an eligibility checker are all soft searches. A hard search is made when you apply for credit. Experian and Equifax keep it visible to lenders for a year and TransUnion shows searches for two years, which is why MoneyHelper says hard searches can remain for up to two years. When you are only asking for a price, organisations can carry out a quotation search, which the ICO says does not show that you have applied for credit. Identity and anti-money laundering checks are also soft: the ICO says no one but you would see them. A search you do not recognise is worth raising with the organisation that made it, because it can be a sign of fraud.

Some lenders give a mortgage decision in principle on a soft search and others record a hard search, so it is worth asking which before you agree to one. A soft-search decision in principle lets you find a likely lender before any hard search is made, so the full application leaves a single hard search on your file. A decision in principle is not an offer, and a lender can still decline once it has checked the file, the income and the property; our page on a mortgage declined after application covers that stage.

How a low credit score mortgage is arranged

1. All three reports. The statutory credit reports from Experian, Equifax and TransUnion reviewed, and the causes of the low score identified: adverse entries with their dates, a thin history, credit use, the electoral roll, searches, associations and errors.
2. Fixes first. The electoral roll, card balances, errors and old associations dealt with where time allows, leaving the weeks each change takes to reach the files.
3. Soft-search decision in principle. From a lender whose scorecard and criteria fit the file, on a soft search where the lender offers one.
4. Application. One hard search, with any adverse credit disclosed accurately, then the lender's affordability check, valuation and underwriting.
5. Offer and completion. The mortgage offer and completion, with a review date set if the file will improve, so that a remortgage can be considered once older entries have aged.

Same credit score, different files: the arithmetic

Two borrowers with the same low agency score are not the same case to a lender, and only one of them is likely to need a specialist lender.

Step 1. The two files

An illustrative case, not a product or an offer. Two borrowers each earn £45,000 a year, have no loans or car finance, hold £10,000 of credit card limits and want to buy a £240,000 home with a £24,000 deposit: a loan of £216,000 at 90% loan to value. Both see a low score on all three agencies' apps, but their files are different.

Step 2. What lenders make of them

Lenders set their own rules, so the rows describe the general direction, not any lender's terms. Two points are fixed by the agencies' published retention periods: B's default stays on the file for six years from the default date, and A's five searches stay visible for a year on Experian and Equifax and two years on TransUnion, whatever A does next.

Borrower A's score will rise and their choice of lenders widen once the administrative causes are fixed. Borrower B's score may rise too, but the default remains on the file for six years, and lenders read it directly whatever the score.

Step 3. What clearing the cards does to the borrowing

Card balances count twice: once in the scoring and again in the affordability sums, because lenders allow for a monthly payment on them. The calculator on this page counts 3% of the balance a month, an assumption that each lender replaces with its own figure. At 5 times income after commitments, the standard income multiple in Mortgage Lane's experience, every £1,000 of card balance then takes £1,800 off the maximum loan. Borrower A repays £6,500 from savings kept apart from the deposit, which brings the balances to £2,500, a quarter of the limits.

On these figures, repaying £6,500 raises A's maximum loan by £11,700 and turns a £7,200 shortfall into £4,500 to spare. The monthly payment on £216,000 over 30 years at 5.2%, the illustrative rate used across our guides and not a product rate, is £1,186.08 for either borrower. The difference between them is which lenders will offer the loan and at what price. If A took the £6,500 from the deposit instead, the deposit would fall to £17,500 and the loan needed would rise to £222,500, a loan to value of about 92.7%, leaving the income £2,000 short. The cash for the cards and the cash for the deposit are the same money, so it is worth working out where a repayment will come from before you apply.

Borrower B's arithmetic is already the stronger of the two: with balances at 20% of the limits, the income supports £221,400, £5,400 more than the loan needed. The sums do not show the default, so B's choices are a lender whose criteria accept a settled default of that age now, or waiting for the default to pass the look-back periods that matter for the lenders that suit the case, with a larger deposit widening the choice in either case.

What decides the case

Separate what is fixable from what is history. Fix the first before applying, leaving time for each change to reach the files, and match the second to lenders whose criteria accept it. For Borrower B, the date of the default and the deposit decide which lenders' limits can be met; for Borrower A, the order of the fixes and the timing of the application do.