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A new build mortgage is not a different product category in the way a buy-to-let or bridging loan is. It is a standard residential mortgage applied to a property that has never been lived in. However, lenders apply a separate set of underwriting criteria to new build properties, making the market significantly more restrictive than for existing homes. Understanding these differences upfront can make the difference between a smooth purchase and a failed application at the last possible moment.
In 2026, the UK new-build market continues to grow, with developers active across London and the South East at every price point. The average new build carries a 15% to 25% premium over equivalent second-hand properties in most markets. That premium raises questions about valuation, making valuation risk the single biggest practical issue in new-build mortgage applications.
New-build properties are sold at developer prices, which include a margin for marketing, developer profit, and sometimes incentive packages. Lenders are concerned that the property may not hold its value in the secondary market at the price the developer is charging. Many lenders apply a lower maximum LTV to new-build flats than to houses, typically 75% for flats versus 85% to 90% for houses. If the lender’s surveyor values the property below the purchase price, the lender bases its advance on the lower figure.
Developer incentives such as cashback, paid stamp duty, fitted kitchens, or upgraded specifications are attractive to buyers but are treated as a reduction in the effective purchase price by most lenders. The FCA caps the value of incentives that can be offered without affecting the mortgage at 5% of the purchase price. Incentives above 5% must be disclosed to the lender and typically result in the lender reducing the purchase price for the purposes of calculating the maximum loan.
Standard mortgage offers are valid for three to six months. New builds regularly take longer to complete. A buyer who reserves off-plan before a development breaks ground may be waiting 12 to 18 months for their property to be built. Most lenders will not extend an offer for the full build-out period, meaning the initial offer may expire before completion. Specialist new-build lenders offer extended validity periods of nine to twelve months from the date of reservation, which can significantly reduce the risk of the offer expiring before completion.
Shared Ownership allows a buyer to purchase a share of between 10% and 75% of a property and pay rent on the remainder. The mortgage is arranged only on the share being purchased. Most lenders who participate in Shared Ownership have a maximum property value and a minimum share size. We identify the right lender for the specific development, share size, and buyer's income.
First Homes properties are sold at a minimum 30% discount to market value. The discount is secured against the title and must be preserved on any future sale. Not all mortgage lenders participate in First Homes because of the restricted title. We identify participating lenders who understand the scheme and are comfortable with the title restriction.
Some developers offer to buy your existing property as part of the deal. The mortgage on the new build is arranged in the normal way, and the proceeds from the developer's part-exchange purchase provide part or all of the deposit. We ensure the mortgage on the new build is in place before the part-exchange completion date.
You pay a reservation fee to the developer to secure the plot or unit. This is typically £500 to £2,000 and is refundable if the mortgage is declined but non-refundable if you withdraw.
We apply as soon as the developer provides the details required for the mortgage application. Timing depends on the expected completion date. For properties completing within three months, we apply immediately. For longer build-outs, we strategically time the application to coincide with the final months of construction.
The lender instructs a valuation. For off-plan properties, this is often a desk-based review of comparable sales in the development and surrounding area. For properties near completion, a physical inspection is more common.
The mortgage offer is issued. As completion approaches, you carry out a snagging inspection of the property with the developer. Any defects identified must be addressed before or shortly after completion.
On completion, the mortgage funds transfer to the developer, the title registers in your name, and you receive the keys. The developer provides a new-build structural warranty, typically an NHBC Buildmark or equivalent, which is required by most mortgage lenders.
Run the numbers, then talk to us. Our financial calculators cover mortgage repayments, how much you could borrow, stamp duty, bridging finance and rental yield. Results are estimates only and should not be relied on as financial advice.
New-build purchases introduce complications that do not arise with existing properties. Here are some of the scenarios our advisers help buyers work through.
Mortgage offers are typically valid for six months, and new-build delays are common. We manage the extension process with your lender and, where an extension is not possible, handle the reapplication efficiently so you do not lose the property.
Developer incentives above a certain threshold can affect how lenders assess the effective purchase price. We make sure the incentive structure is disclosed correctly, protecting you legally and ensuring the lender does not reduce the mortgage at the last minute.
A down-valuation on a new build is more common than on resale properties. It increases the effective LTV and can reduce what the lender will advance. We advise on whether to challenge the valuation, renegotiate with the developer, or approach a different lender.
A Shared Ownership mortgage covers only your purchased share, not the full property value. The number of lenders offering Shared Ownership products is more limited. We identify the right lender for your share size, income profile, and the specific development.
Speak to an adviser to discuss your circumstances and explore how bridging finance could work for you.
Clear,honest answers to the questions we hear most from clients and introducers.
New-build flats in certain locations, particularly high-rise urban developments and those with significant concentrations of investor-owned units, have historically shown weaker performance in the secondary market. Some lenders apply blanket restrictions on new-build flats to manage this exposure. Others apply restrictions in specific postcodes or above certain floor heights. We know which lenders are active in new-build flat lending in London and the South East and avoid applying to lenders with relevant restrictions before application.
The NHBC Buildmark warranty is the most common new-build structural warranty in the UK. It provides protection against major structural defects for 10 years from completion. Most mortgage lenders require a 10-year structural warranty as a condition of lending on a new-build property. LABC and Premier Guarantee are alternative warranty providers also accepted by most lenders.
Yes. The Lifetime ISA offers a 25% government bonus on savings of up to £4,000 per year. It can be used towards a first-home purchase on properties up to £450,000. The bonus is paid on completion, not exchange, so funds must be requested from HMRC well in advance of your completion date.
Yes. The lender’s valuation protects the lender, not you. A snagging survey or full HomeBuyer Report identifies defects before completion and gives you a list of items to address with the developer under the warranty. Many buyers waive a survey on new builds, assuming everything is perfect. The reality is that new builds frequently have cosmetic and, sometimes, structural snagging issues that are much easier to address before moving in than after.
We search the market and handle the process so you can focus on moving.
Whole of market search across a wide panel of lenders
Dedicated adviser throughout the process
We handle the paperwork and liaise with lenders on your behalf
