Your credit score is a numerical rating that lenders use to assess how reliably you repay debt. Improving your credit score before applying for a mortgage can help you access better interest rates and increase your chances of approval.
Why Your Credit Score Matters for a Mortgage
Your credit score is one of the first things a mortgage lender checks. It tells them how reliably you've managed debt in the past and influences whether they'll approve your application — and at what interest rate.
A higher credit score can mean access to better rates, potentially saving you thousands over the life of your mortgage. Even a 0.2% rate difference on a £200,000 mortgage saves over £4,000 across a 5-year fix.
Step 1: Check Your Credit Report
Before doing anything else, get a copy of your credit report from all three UK credit reference agencies:
- Experian: Free via the Experian app or MoneySavingExpert's Credit Club
- Equifax: Free via ClearScore
- TransUnion: Free via Credit Karma
Check for errors: wrong addresses, accounts you don't recognise, incorrect payment statuses, or outdated financial associations. Dispute any errors directly with the credit agency — they must investigate within 28 days.
Step 2: Register on the Electoral Roll
This is the single easiest way to improve your credit score. Being on the electoral roll confirms your identity and address, which lenders use to verify who you are. If you're not registered, many lenders will decline your application outright.
Register at gov.uk/register-to-vote — it takes 5 minutes and is completely free.
Step 3: Reduce Credit Utilisation
Credit utilisation is the percentage of your available credit that you're using. If you have a £5,000 credit limit and a £4,000 balance, that's 80% utilisation — lenders see this as risky.
Target: keep utilisation below 30%. Below 10% is even better. Pay down balances before your statement date, not just before the due date, because it's the statement balance that gets reported to credit agencies.
Step 4: Build a Perfect Payment History
Payment history is the single most important factor in your credit score. Set up direct debits for every credit account to ensure you never miss a payment.
- Missed payments stay on your file for 6 years but their impact reduces over time
- Defaults are more serious and can affect mortgage options significantly
- CCJs (County Court Judgments) are the most damaging — see our bad credit mortgages guide
If you have no credit history at all, consider getting a credit-builder credit card, using it for small purchases, and paying it off in full each month.
Step 5: Prepare in the Months Before Applying
- 6 months before: Stop applying for new credit. Each application leaves a "hard search" on your file.
- 3 months before: Reduce any outstanding debts as much as possible. Close unused credit cards (but keep your oldest account open).
- 1 month before: Check your report one final time for errors. Ensure all addresses are correct and consistent.
- Financial associations: If you have a financial link to someone with poor credit (e.g., a joint account or old partner), request a "financial disassociation" from the credit agency.
Get Fee-Free Mortgage Advice
Worried about your credit score? A fee-free broker can assess your situation and recommend lenders most likely to approve your application. We know which lenders are more flexible with credit history.
Frequently Asked Questions
- What credit score do I need for a mortgage?
- There's no universal minimum. Each lender has its own criteria. A score above 700 on Experian (out of 999) is generally considered 'good'. Below 560 is 'poor' but specialist lenders may still help.
- How long does it take to improve a credit score?
- Some changes (like registering to vote) take effect within weeks. Paying down debt and building payment history takes 3–6 months to show meaningful improvement.
- Does checking my own credit score affect it?
- No. Checking your own credit report is a 'soft search' and has zero impact on your score. Only applications for credit (hard searches) can affect it.
- Can I get a mortgage with bad credit?
- Yes — specialist lenders work with borrowers who have CCJs, defaults, or missed payments. Rates will be higher but a broker can find options. See our bad credit mortgages guide for more.
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