5% Deposit on New Builds in England: Adviser Steps to Secure One

IMPORTANT: YOUR HOME MAY BE REPOSSESSED IF YOU DO NOT KEEP UP REPAYMENTS ON YOUR MORTGAGE.

Yes, you can often buy a new build with a 5% deposit in England, but only if you pick the right route and confirm lender acceptance first. The main paths are developer deposit contributions, the government's Mortgage Guarantee Scheme at 95% loan-to-value, a Lifetime ISA, or discounted routes such as First Homes and shared ownership. Each comes with its own conditions, and some developer incentives create legal complications a lender may not accept, so check the terms before you rely on any of them.

TL;DR:

A 5% deposit on a new build corresponds to a 95% LTV mortgage, which tends to be the most expensive and less widely available option.

Developer incentives such as deposit boosts, matches, or paying the deposit directly often involve legal or lender acceptance considerations that must be verified beforehand.

Government schemes like the Mortgage Guarantee Scheme and Lifetime ISA can support 95% LTV mortgages and offer savings bonuses that reduce the deposit amount.

Coordinating the timing of the reservation fee, mortgage approval, conveyancer actions, and ISA withdrawals is critical to avoid losing a reserved plot.

Engaging a dedicated mortgage adviser can streamline the process, verify lender acceptance of incentives, and ensure all deadlines align for a successful purchase.

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What deposit levels and LTV mean for your new build mortgage
How developer deposit contributions and incentives actually work
What government schemes can reduce your new home deposit requirement
What's the timeline from reservation to completion on a new build?
How a dedicated mortgage adviser helps with a low-deposit new-build purchase
Get help securing a new-build mortgage with a small deposit
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FAQ

What deposit levels and LTV mean for your new build mortgage

Loan-to-value, or LTV, is the percentage of the property's price you're borrowing rather than paying upfront. A 5% deposit means a 95% LTV mortgage, the highest and typically most expensive tier lenders offer. Put down 10% and you're at 90% LTV; put down 15% and you drop to 85% LTV, both of which usually unlock a wider pool of lenders and sharper rates.

The pounds and pence matter more than the percentages once you're staring at a reservation form.

£200,000 property: £10,000 deposit
£300,000 property: £15,000 deposit
£400,000 property: £20,000 deposit

The Mortgage Guarantee Scheme exists precisely to make 95% LTV products available, since it encourages participating lenders to offer them by underwriting some of the risk. That access comes at a cost.

How developer deposit contributions and incentives actually work

Housebuilders often advertise help toward your deposit, and it's worth understanding the mechanics before you factor one into your budget. Three common structures turn up on new-build sites:

Deposit boost: the developer adds a fixed sum or percentage on top of your own deposit, increasing your effective equity in the property.
Deposit match: the developer matches part of what you've saved, up to a stated limit, effectively topping up your contribution rather than replacing it.
Developer-paid deposit: the developer covers the deposit directly, often as part of a wider incentive package tied to a specific plot or completion date.

Caps typically sit around "up to 5%" or a few tens of thousands of pounds, though the exact figure varies by site and by how quickly the developer wants that unit sold.

Before you factor any of this into your affordability sums, check three things: whether the incentive creates a second charge against the property, whether your chosen lender will even accept a developer contribution as part of the deposit, and how long the offer stays valid once you've reserved. Some incentives lapse if exchange slips past a set date, and the FCA has set out specific rules on how shared equity or second-charge arrangements linked to these schemes must be administered and disclosed.

Pro Tip: Ask the developer's sales team for the incentive's terms in writing before you reserve, then send that document straight to your adviser or conveyancer. Verbal promises about "up to £20,000 off" mean nothing once a lender's underwriter starts asking what the money is actually for.

Written incentive terms moving through review stages

What government schemes can reduce your new home deposit requirement

Several state-backed routes exist specifically to help buyers with less cash upfront, and they suit different situations rather than competing with each other.

Mortgage Guarantee Scheme: supports lenders offering 91–95% LTV mortgages, so a 5% deposit gets you a mortgage product rather than a rejection. Check Gov.
Lifetime ISA: you can save up to £4,000 a year with a 25% government bonus, worth up to £1,000 annually, toward a first home costing £450,000 or less. The account must have been open at least 12 months before you use it.
First Homes scheme: offers a 30 to 50% discount on selected new-build or qualifying resale properties for eligible first-time buyers, subject to household income limits of £80,000 outside London and £90,000 in London.
Shared ownership: lets you buy a share of a property and pay rent on the rest, lowering the deposit needed relative to the full purchase price.

Worth flagging: the government opened a consultation in 2026 on a new ISA for first-time buyers intended to eventually replace the Lifetime ISA. Nothing has changed yet, but the rules above may not stay fixed indefinitely.

What's the timeline from reservation to completion on a new build?

New-build purchases move on the developer's clock, not yours, which is exactly why the paperwork sequence matters more here than on a resale property.

Pay the reservation fee. This secures the plot, usually for a few hundred pounds, and is sometimes non-refundable if you pull out. Ask upfront what happens to it if your mortgage falls through.
Instruct your conveyancer immediately. If you're using Lifetime ISA funds, the conveyancer must request the withdrawal directly from your LISA manager and supply specific declarations. Get this moving on day one, not after your mortgage offer lands.
Get your mortgage offer aligned with the exchange deadline. Developers often set a fixed window, sometimes as tight as 28 days from reservation, for exchange of contracts, and delays on either the mortgage or the LISA withdrawal can jeopardise your reserved plot.
Arrange buildings insurance from the point of exchange, since you become legally liable for the property from that moment even though completion hasn't happened yet.
Complete and pay the balance. Funds withdrawn from a LISA generally need to reach the conveyancer and be used within 90 days of withdrawal unless an extension is agreed.

Missing any one of these steps can cost you the plot and, in some cases, your reservation fee.

How a dedicated mortgage adviser helps with a low-deposit new-build purchase

Clients typically work with a single dedicated adviser during the mortgage process, often with access to various UK lenders and proactive case management instead of multiple contacts. For a new-build purchase with a small deposit, that continuity does specific, practical work:

Confirming with the lender in advance whether a developer's deposit contribution or incentive will actually be accepted, rather than discovering a problem after reservation.
Co-ordinating with your conveyancer so Lifetime ISA withdrawal paperwork moves in step with the developer's exchange deadline.
Packaging contractor, self-employed, or other complex professional income into the format a lender's affordability assessment expects, which matters when the type of evidence lenders want varies significantly between providers.
Tracking exchange and completion dates against your mortgage offer's validity period so nothing lapses mid-process.

Advice from Haven Mark Advisers is fee-based and regulated; for broader guidance on how expert advice can help reduce your mortgage costs, see how to reduce your mortgage costs with expert advice. No adviser, including ours, can guarantee lender acceptance of a developer contribution, a specific rate, or that your application will be approved.

Get help securing a new-build mortgage with a small deposit

Reservation forms, developer incentive terms, and Lifetime ISA withdrawal windows rarely line up by accident, particularly when your income comes from contracting, a professional practice, or a business you run yourself. Mortgage services that assign one dedicated adviser from reservation through to completion can help avoid the need to re-explain income structures to new contacts halfway through the process.

Haven Mark Advisers

Our new build mortgage service covers exactly the coordination this article has walked through: checking whether a lender will accept a developer's deposit contribution, liaising with your conveyancer on Lifetime ISA timing, and tracking your exchange deadline against your mortgage offer. Fees are agreed and disclosed upfront, and full details sit on our fees and how we're paid page. Advice is fee-based and regulated; we cannot guarantee lender acceptance, a specific rate, or that any application will succeed. If you've reserved a plot, or you're close to reserving one, get in touch with an adviser before you sign anything, since the exchange window on most new builds starts moving the moment your reservation fee clears.

This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.

Sources

FAQ

Can you do a 5% deposit on a new build?

Yes, many lenders offer 95% LTV mortgages on new builds, particularly through products supported by the Mortgage Guarantee Scheme. Availability and rates vary by lender, so confirming which providers will accept your specific circumstances is worth doing early.

Can I get a 0% deposit mortgage in the UK?

Some developer deposit-boost or deposit-match incentives can reduce what you pay from your own savings, but a lender still requires a deposit to be in place, and the incentive itself may involve a second charge that needs checking.

Do you pay a deposit on a new build?

The reservation fee and the deposit are separate payments with different purposes and different refund rules.

Is £30,000 enough for a house deposit?

It depends entirely on the property's price and the LTV you're targeting. A dedicated adviser can map your savings against realistic price points before you start viewing.