Buying a new-build home involves some considerations that differ from buying an older property, which affect the mortgage. This guide explains new-build mortgages: how valuations and offers work, developer incentives, the schemes available, lenders' rules on new-builds, and the warranties and checks to be aware of.

What is different about new-builds

A new-build mortgage is a normal mortgage, but buying a new home brings particular factors: valuations can be approached cautiously, build timescales affect the mortgage offer, developers may offer incentives, and lenders sometimes have specific rules for new-builds, especially flats. Being aware of these differences helps you navigate a new-build purchase smoothly, as our guide to how a mortgage works explains for the basics.

Valuations and the new-build premium

New-builds can carry a price premium over similar older homes, a bit like a new car, and lenders' valuations may come in cautiously. If a valuation is lower than the price, you may need a larger deposit to cover the gap, as our guide to loan-to-value (LTV) explains. Understanding that new-build values can behave differently, and may not rise immediately, is important, particularly if buying with a small deposit.

Mortgage offer validity and build delays

If you buy off-plan, before the home is built, completion may be months away, so you need a mortgage offer that lasts long enough, and build delays can cause an offer to expire before completion. Some lenders offer longer offer periods for new-builds. Checking how long your offer is valid, and what happens if the build is delayed, helps avoid the problem of an offer lapsing before you can complete.

Developer incentives

Developers often offer incentives to buyers, such as help with the deposit, paying stamp duty or fees, or providing fittings. Lenders take incentives into account, and there are limits on how much incentive they will accept relative to the price. Incentives can be valuable, but it is important to declare them and understand how they affect the valuation and mortgage, so they genuinely benefit you within the lender's rules.

New-build schemes

Several schemes help new-build buyers, including Deposit Unlock for a 5% deposit, builder rate-reducer schemes, and Help to Buy in Wales, as our guide to Deposit Unlock explains. These can lower the deposit or rate on a new home. Checking what schemes a development offers, alongside the standard mortgage options, can improve affordability when buying a new-build, particularly for first-time buyers with smaller deposits.

Lenders' rules on new-builds

Lenders sometimes apply specific rules to new-builds, such as lower maximum loan-to-values on new-build flats, which they may view as higher risk, meaning a larger deposit can be required. Criteria vary by lender. So if you are buying a new-build flat in particular, it is worth checking lenders' new-build rules, as the deposit needed may be higher than for a house or an older property, which a broker can help with.

Warranties and snagging

New homes usually come with a warranty, such as an NHBC or similar ten-year warranty, covering certain defects, which lenders often require. New-builds can also have snags, minor faults to be fixed by the developer after completion. Knowing about the warranty and the snagging process helps you protect your investment and get issues resolved. These are part of the particular experience of buying and mortgaging a new-build home.

Buying off-plan

Buying off-plan means committing to a new home before it is built, based on plans, often with a longer wait to completion. This can let you secure a home early, sometimes at an earlier price, but carries the uncertainty of build timescales and the need for a mortgage offer that lasts, as our guide to how mortgages work relates. Understanding the off-plan process helps you plan a new-build purchase that may complete months ahead.

Reservation fees and timelines

New-build purchases often involve paying a reservation fee to secure the plot, then proceeding to exchange within a set period, with completion when the home is ready. These timelines, and the deadlines developers set, can be tighter or longer than a normal purchase. Knowing the reservation fee, the exchange deadline and the expected completion helps you line up your mortgage and finances to meet the developer's schedule.

Leasehold on new-build flats

Many new-build flats, and sometimes houses, are sold leasehold, with service charges and sometimes ground rent, which affect ongoing costs and the mortgage, as our guide to leasehold costs relates. Reviewing the lease terms, charges and any escalating ground rent before buying is important, as onerous terms can affect affordability and resale. Understanding the leasehold position is a key part of buying a new-build flat.

Energy efficiency of new homes

New-builds are usually more energy-efficient than older homes, which can mean lower running costs and may qualify for green mortgage deals from some lenders, sometimes with slightly better rates or cashback. While not the main factor in a purchase, the efficiency of a new home is a genuine benefit worth noting. Asking whether green mortgage options apply to an energy-efficient new-build can occasionally improve your deal.

Negotiating on new-builds

There can be room to negotiate on new-builds, not always on the headline price, which developers like to protect, but on incentives such as deposit contributions, paid fees or upgrades. Understanding what a developer might offer helps you get better value. Since incentives affect the valuation and mortgage within lender limits, it is worth discussing options with the developer and your broker to make the most of a new-build purchase.

Using a broker for new-builds

Because new-builds have particular valuation, offer-validity, incentive and lender-criteria issues, a broker experienced in new-builds can be especially helpful, finding lenders comfortable with new homes and longer offer periods, and navigating incentives, as our guide to Deposit Unlock relates. Given the extra complexity of new-build purchases, particularly off-plan or with a small deposit, guidance from a broker can smooth the process and help you secure a suitable mortgage.

Weighing a new-build purchase

A new-build offers a brand-new, energy-efficient home with warranties and often modern features, but brings considerations like the price premium, leasehold terms on flats, and the need to manage build timescales and valuations. Weighing these against the appeal of a new home, and checking the schemes and incentives available, helps you decide whether a new-build is right for you and arrange the mortgage to suit, as our guide to loan-to-value notes for deposit planning.

Approached with an understanding of how new-build valuations, offers, leases and incentives work, a new-build purchase can run smoothly, and a broker who knows the new-build market can help you secure a suitable mortgage and avoid the common pitfalls.

In short

New-build mortgages are normal mortgages, but new homes bring particular factors: a possible price premium and cautious valuations, the need for a mortgage offer that lasts through build delays, developer incentives within lender limits, schemes like Deposit Unlock, lender rules that can require larger deposits on new-build flats, and warranties and snagging. Understanding these helps a new-build purchase go smoothly, especially with a small deposit.

Where to get help and next steps

Read our guides to Deposit Unlock, how a mortgage works, and what loan-to-value means. This is general information, not mortgage or financial advice; scheme rules change, so check current details.