New Build Mortgage UK: Complete Guide for Buyers

How New Build Mortgages Work

A new-build mortgage is a mortgage on a property that has been newly constructed or converted and has not been previously occupied. While the basic principles are the same as any mortgage, new builds come with unique considerations:

• Higher deposit requirements: Many lenders require 10–15% minimum deposit for new builds (compared to 5% for existing properties). This is because new-build valuations can be less certain.
• Fewer lender options: Not all lenders offer new-build mortgages, particularly for flats in high-rise developments. A broker with access to 90+ lenders is essential.
• Extended mortgage offer validity: Off-plan purchases (buying before the property is built) may take 6–12 months to complete. Standard mortgage offers only last 3–6 months, so you need a lender that offers extended validity.
• Developer incentives: Many developers offer incentives that can affect the mortgage application — your broker needs to factor these in.

Buying Off-Plan

Buying off-plan means purchasing a property before it's built, based on plans, CGIs, and show homes. It's common with larger developments and can offer advantages:

• Early-bird pricing: Developers often offer lower prices at launch to generate interest and secure sales.
• Choice of plot and specification: Early buyers often get the best selection and may be able to choose fixtures and finishes.
• Potential price growth: If property values rise during the build period, your property may be worth more on completion than you paid.

Risks of Buying Off-Plan

• Construction delays: Build programmes can overrun, leaving you in limbo. Your mortgage offer may expire, requiring a new application.
• Valuation issues: If the market drops during the build period, the completed property may be valued below your purchase price.
• Specification changes: Developers sometimes substitute materials or finishes. Check your contract carefully.

A broker experienced in off-plan purchases can arrange mortgage offers with extended validity and advise on contingency planning.

Developer Incentives

Developers frequently offer incentives to attract buyers. These can be valuable, but they must be declared to your mortgage lender as they can affect the valuation:

• Deposit contribution (up to 5%): The developer contributes towards your deposit. This can be combined with your own savings to meet the lender's minimum deposit requirement.
• Stamp duty paid: The developer covers your Stamp Duty Land Tax bill — potentially saving first-time buyers thousands.
• Furniture and upgrade packages: Included flooring, kitchen upgrades, fitted wardrobes, or a furniture pack.
• Legal fees paid: The developer covers your solicitor's costs.
• Part-exchange: The developer buys your existing property, removing you from a chain and speeding up the process.

Important: Lenders typically allow total incentives up to 5% of the property value on standard purchases. Incentives above this may result in the lender reducing the property valuation for mortgage purposes.

Government Schemes for New Builds

Several government-backed schemes are available specifically for new-build purchases:

• Shared Ownership: Buy a share (25–75%) of a new-build property and pay rent on the remainder. Available through housing associations. See our shared ownership guide.
• First Homes Scheme: New builds sold at 30–50% discount to eligible first-time buyers and key workers. Properties must be priced at £250,000 or less after discount (£420,000 in London).
• Deposit Unlock: An insurance-backed scheme allowing you to buy a new build with just 5% deposit from participating developers and lenders.
• Mortgage Guarantee Scheme: Government-backed 95% mortgages available on new builds up to £600,000.

Snagging Surveys and NHBC Warranty

Snagging Survey

A snagging survey identifies defects in a newly built property before you move in. Unlike a full property survey, it focuses on workmanship issues:

• Poor plastering, paint finishes, and tiling
• Misaligned doors and windows
• Plumbing issues (leaks, poor water pressure)
• Electrical problems (switches in wrong locations, missing sockets)
• External defects (unfinished landscaping, damaged brickwork)

Cost: £300–£600. It's money well spent — the developer is obligated to fix snagging issues, but only if you report them.

NHBC Warranty

Most new builds come with a 10-year NHBC Buildmark warranty (or equivalent from LABC, Premier Guarantee, etc.):

• Years 1–2: The developer must fix any defects caused by failure to meet NHBC standards
• Years 3–10: Insurance covers structural defects (foundations, load-bearing walls, roof structure, weatherproofing)

Most mortgage lenders require an NHBC or equivalent warranty as a condition of lending on a new build.

Tips for Buying a New Build

• Use an independent solicitor: Don't use the developer's recommended solicitor — they may prioritise the developer's interests over yours.
• Get a snagging survey: Book it before completion so defects can be addressed before you move in.
• Research the developer: Check NHBC builder ratings, Google reviews, and ask existing residents about their experience.
• Negotiate: Developer incentives are negotiable, especially on plots that have been available for a while.
• Check the management company: For leasehold new builds (especially flats), research the management company and service charge history.
• Use a specialist broker: New-build mortgages have unique requirements. A broker experienced in this area will know which lenders work best for your situation.