Everything you need to know about new build mortgages uk in the UK.
Buying a new build property introduces several differences compared to purchasing an existing home. While the fundamental mortgage process is the same, new build purchases often involve longer timelines (especially when buying off-plan), different deposit requirements, developer incentives that can complicate valuations, and lender restrictions on certain types of new build property.
Not all lenders are willing to lend on new builds, and those that do may have specific criteria around the developer, the property type, and the sale terms. Understanding these nuances before you start searching for a mortgage can save significant time and frustration.
New build mortgages typically require a larger deposit than equivalent existing properties. While 5% deposit mortgages exist for new builds, many lenders require a minimum of 10–15% because of the perceived risk of new build properties falling in value shortly after purchase (sometimes referred to as the "new build premium" wearing off).
When buying off-plan, you will usually pay a reservation fee of £500 to £2,000 (often deducted from the purchase price) and then exchange contracts with a 10% deposit. This deposit is held by the developer's solicitor until completion, which could be months or even years away for properties still under construction.
If your financial circumstances change between exchange and completion — for example, if you lose your job or interest rates rise significantly — you could find yourself unable to complete the purchase and at risk of losing your deposit. This is an important risk to consider with off-plan purchases.
Developers frequently offer incentives to attract buyers, including:
Lenders treat incentives carefully because they can artificially inflate the property's apparent value. Most lenders cap the total incentive value at 5% of the purchase price for standard LTV mortgages, or more for higher LTV products. Incentives above the cap must be deducted from the property value for lending purposes, reducing the amount you can borrow.
💡 Always disclose all developer incentives to your mortgage lender and broker. Failing to declare incentives can constitute fraud, and if the lender discovers undisclosed incentives later, they could demand immediate repayment of the loan. Full transparency protects you legally.
Buying off-plan means purchasing a property before it is built, based on plans and specifications. The mortgage process for off-plan purchases has some unique challenges. Your mortgage offer is typically valid for only three to six months, but an off-plan build may take 12 to 24 months to complete. This means you may need to reapply for a mortgage as completion approaches.
Interest rates and lending criteria can change between your initial application and the new application needed closer to completion. If rates have risen significantly, you may be able to borrow less than originally anticipated. Conversely, if rates have fallen, you could benefit from a better deal.
Some lenders offer extended mortgage offers (up to nine months) for new build purchases, and a few will hold rates for longer periods on off-plan properties. A broker familiar with the new build market can identify which lenders offer the most favourable terms for off-plan buyers.
Lenders may have specific restrictions on certain types of new build property. High-rise apartments (generally above four to six storeys) have fewer willing lenders, particularly since the cladding crisis highlighted fire safety concerns. Properties with certain types of external cladding may be difficult to mortgage until an EWS1 (External Wall System) form confirms the building's fire safety.
Other potential issues include leasehold properties with onerous ground rent terms (escalating ground rents above £250 per year may deter lenders), shared ownership and shared equity arrangements (not all lenders participate), and properties from developers with a poor track record of build quality or timely completion.
⚠️ Before committing to a new build purchase, especially a leasehold flat, check the ground rent terms carefully. Under the Leasehold Reform (Ground Rent) Act 2022, ground rents on most new long residential leases granted after 30 June 2022 must be set at zero (a peppercorn). Older new builds may still have escalating ground rents that can cause mortgage difficulties.
The Help to Buy equity loan scheme, which provided a government loan of up to 20% (40% in London) of the purchase price for new build homes, closed to new applications in October 2022. Completions under the scheme ended in March 2023. If you purchased under Help to Buy, the equity loan must be repaid after 25 years or when you sell the property, based on the market value at the time of repayment.
Current assistance for new build buyers includes shared ownership (available on many new developments), the First Homes scheme (offering a minimum 30% discount on new builds for first-time buyers and key workers), and various developer-specific schemes. A broker can help you understand which schemes apply to your chosen development.
The new build mortgage market has complexities that many buyers are unaware of until they encounter problems. A broker experienced in new build purchases can steer you towards lenders that are comfortable with your specific development, handle developer incentive declarations correctly, and manage the timing challenges of off-plan purchases.
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