How do mortgage lenders credit score you?

Most mortgage lenders credit score an application in two stages: an automated scorecard checks your credit report against the lender’s own rules first, and any application that doesn’t fit neatly within that automated model is referred to a person for manual underwriting. Adverse credit, such as a CCJ, default or past insolvency, is one of the most common reasons an application ends up in that second, manual stage rather than being decided automatically.

Knowing roughly how this process works can help make sense of why two similar-looking applications can end up on different paths.

Stage one: the automated scorecard

When you apply, the lender requests your credit report from one or more agencies and runs it through its own automated scorecard. This isn’t the score you might see in a banking app; it’s a model built specifically by that lender, weighing different pieces of information from your report, such as payment history, how long you’ve held accounts, how much available credit you’re using, and any adverse entries, into an internal result.

Each lender builds and weights its scorecard differently, and none of this is published. That’s part of why identical credit reports can produce different automated outcomes at different lenders.

Stage two: policy and lending criteria

Alongside the scorecard, a lender applies its own policy rules: fixed criteria about what it will and won’t consider, regardless of the scorecard result. This might include rules about a maximum number of CCJs, how recent a default can be, or whether an active IVA is considered at all. Where the scorecard produces a borderline result, or the file includes something the automated system isn’t built to assess confidently, the application is typically referred rather than decided automatically.

Why a referral isn’t the same as a decline

Being referred for manual underwriting often worries people, but it isn’t a decline. It means the automated system couldn’t confidently decide on its own, commonly because something on the file, such as a satisfied CCJ, an older default, or a mix of factors, needs a person to look at the fuller context rather than a single automated result. An underwriter can use judgement within the lender’s policy, for example weighing up how a default fits alongside a clean record since, though they can’t approve something that breaks a firm policy rule.

This is one reason specialist adverse credit lenders often rely more heavily on manual underwriting than mainstream lenders do, since their whole proposition is built around assessing files that an automated mainstream scorecard would typically decline or refer.

Where a decision in principle fits in

Many applications start with a decision (or mortgage) in principle, an early check giving an initial indication before you formally apply. Some lenders run this using a soft search, invisible to other lenders, while others use a hard search even at this early stage, so it’s worth checking which applies. A decision in principle can give an early signal, but it isn’t a guarantee, since full underwriting, including affordability and a closer look at your credit file, still follows once you formally apply.

How adverse credit specifically fits into the scoring

Adverse credit doesn’t sit outside this process; it’s one of the inputs the scorecard and policy rules consider, alongside everything else on your report. In general terms:

• Type of entry. Mortgage arrears and formal insolvency are typically weighted more heavily than a single missed utility payment.
• Recency. A recent entry usually affects a scorecard result more than an old one, and policy rules often set specific limits based on how many months or years have passed.
• Number and pattern. Several entries, or a recent pattern of issues, are generally weighted more heavily than one isolated event.
• Status. Whether an entry is settled or still outstanding can affect both the scorecard result and the policy rules applied on top.

Because every lender sets its own scorecard and policy, the same credit file genuinely can produce different results at different lenders, which is why a decline at one lender doesn’t answer the question of what another lender, or a specialist adverse credit lender, would decide.

What this means if you’re remortgaging with adverse credit

If you know your file includes something like a CCJ, default or past insolvency, it’s worth expecting that your application may be referred for manual underwriting rather than decided automatically, and that’s not necessarily a bad sign. Having your documents ready, being able to explain what happened and what’s changed since, and approaching lenders whose policy is more likely to fit your circumstances all tend to help more than trying to guess how any one automated scorecard will react. Our guide on whether you need a broker for a bad credit remortgage explains how an adviser who knows different lenders’ policies can steer you toward ones more likely to consider your situation.

Credit scoring is only part of the picture; lenders also assess affordability separately, including a stress test against higher rates. Our page on remortgaging with a low credit score covers both sides together, and if any of this involves other debts you’re considering rolling into your remortgage, read about the risks of debt consolidation remortgages first.

Check your statutory credit report free from Experian, Equifax and TransUnion before you apply, and if money worries sit alongside any of this, free and impartial help is available from MoneyHelper, StepChange and National Debtline.