First-Time Buyer Mortgage Guide UK 2025: Everything You Need to Know

Buying your first home in the UK involves more moving parts than most people anticipate. The mortgage is the obvious starting point, but the deposit requirements, stamp duty relief, government schemes, solicitor costs, survey fees, and the actual process of making an offer and completing all need to work together. Getting a clear picture of what you can afford, what assistance is available, and what the full cost of purchase looks like before you start viewing properties saves a lot of frustration later.

This guide walks through the complete first-time buyer journey for 2025, from understanding how much you can borrow to what happens on completion day. Use our mortgage affordability calculator to get a personalised estimate of your borrowing capacity based on your income and existing commitments.

How mortgage affordability is calculated

Mortgage lenders assess how much they will lend based on two factors: your income and your outgoings. The income multiple rule of thumb is that lenders will typically lend between four and four and a half times your gross annual income, though some lenders go higher for applicants with strong credit profiles or in professional occupations. For joint applicants, the combined income is used. A couple earning £35,000 and £30,000 respectively might be able to borrow between £260,000 and £292,500 on income multiples alone.

Income multiples are a ceiling, not a guarantee. Lenders also run an affordability assessment that looks at your actual outgoings: existing debt repayments, credit commitments, household bills, childcare costs, and living expenses. They stress test the mortgage repayments against a rate higher than the actual rate to ensure you could still afford payments if rates rise. If your outgoings are high relative to your income, the affordability assessment may give a lower figure than the income multiple suggests.

Your credit history matters significantly. A clean credit record with a track record of managing accounts well gives you access to the best rates and the widest choice of lenders. Any defaults, missed payments, high credit utilisation, or county court judgements in the past six years will affect what lenders are willing to offer. Checking your credit file with all three main agencies before applying for a mortgage, and correcting any errors, is worthwhile preparation.

Deposit requirements for first-time buyers

Most mortgage lenders require a minimum deposit of 5% of the purchase price, though 10% is more commonly required for the best rates. At 5% deposit you have a 95% loan-to-value mortgage, which attracts higher interest rates because the lender has less equity cushion if property values fall. At 10% deposit the range of available products and interest rates improves considerably. At 20% or above you generally access the most competitive rates.

The Lifetime ISA (LISA) is one of the most effective deposit-saving tools for first-time buyers. You can save up to £4,000 per year in a LISA and the government adds a 25% bonus on contributions, meaning you receive up to £1,000 per year in free money. The funds must be used for a first home purchase of up to £450,000 or for retirement. You can have a LISA from age 18 to 39, and the account must have been open for at least 12 months before you use it to buy.

Stamp duty for first-time buyers

First-time buyers in England and Northern Ireland pay no stamp duty on the first £425,000 of a property purchase price, up to a total purchase price of £625,000. This relief is significant compared to the standard rates and represents a saving of up to £11,250 on a £425,000 purchase. Properties above £625,000 do not qualify for first-time buyer relief and are taxed at standard rates from the first pound.

The first-time buyer definition requires that you have never owned a residential property anywhere in the world, not just in the UK. If you previously owned a property abroad, even if you sold it years ago, you would not qualify as a first-time buyer for SDLT purposes. Joint purchasers both need to qualify as first-time buyers to use the relief. If one buyer owns or has owned a property previously, neither buyer can claim the relief. Our stamp duty calculator calculates your exact liability based on your buyer status and property price.

The mortgage application process

Getting a mortgage in principle (MIP or AIP) is the logical first step before you start making offers. A mortgage in principle is a lender's conditional agreement to lend you a specified amount, based on a soft credit check and your declared income. Having an MIP makes your offer more credible to sellers and their agents because it demonstrates you are a serious buyer with financing in place. Most MIPs are valid for 60 to 90 days.

When you make an offer and it is accepted, you progress to a full mortgage application. This involves submitting payslips, bank statements, P60s, proof of deposit, and identity documents to the lender. The lender commissions a mortgage valuation of the property to confirm it is worth what you are paying. If the valuation comes in below the purchase price, the lender will only lend against the lower value, which can affect your deposit calculation and potentially require renegotiation with the seller.

A full structural survey, either a homebuyer report or a full building survey, is separate from and in addition to the mortgage valuation. The valuation protects the lender. A proper survey protects you by identifying structural issues, damp, roof problems, or other defects that could affect the property's value or your future maintenance costs. Many first-time buyers skip this to save money and regret it later when unexpected repairs emerge.

All the other costs first-time buyers often forget

Stamp duty and the deposit are the big upfront costs, but several others can catch first-time buyers off guard. Solicitor or conveyancer fees typically run £1,000 to £2,500 including disbursements. Mortgage arrangement fees vary by lender and product, running from zero to over £1,000. A survey costs £300 to £1,500 depending on the type. Moving costs for a house move are typically £800 to £2,000. Buildings insurance is required from exchange of contracts and costs roughly £150 to £400 per year. Together these additional costs routinely add £3,000 to £6,000 to the purchase beyond what buyers have estimated.

For buyers considering properties in Europe as an alternative to the UK market, our EU cost of living comparison and European mortgage calculator provide a sense of how property purchase costs and mortgage markets compare across different European countries.