What deposit is required for off-plan property?

Most UK developers require a 10% deposit at exchange of contracts, sometimes with a reservation fee of £500–£2,000 paid upfront. Some schemes offer staged deposits (e.g., 5% at reservation, 5% at exchange). The deposit is typically held by the developer's solicitor and should be protected under a warranty scheme such as NHBC Buildmark.

What happens if the developer goes bust?

If you have NHBC Buildmark or equivalent warranty cover, your deposit is protected up to a certain limit (typically £100,000 with NHBC). Without warranty protection, your deposit may be at risk and you would become an unsecured creditor in the insolvency proceedings. Always ensure warranty cover is in place before exchanging contracts.

Can property values fall between exchange and completion?

Yes. If the property market declines between exchange and completion (which could be 1–3 years), the property may be worth less than the purchase price. You are still legally obligated to complete. However, if you need a mortgage, the lender will value the property at completion and may offer less than expected, requiring you to fund the shortfall.

Investment Guide|7 April 2026

Buying Off-Plan Property in the UK: Risks, Benefits & Developer Checks

Off-plan purchases can offer below-market prices and capital growth during construction - but they carry unique risks. This guide explains what to check, how developers structure payments, and what protections exist for UK buyers.

What Is Off-Plan Property?

Buying off-plan means purchasing a property before it has been built, or while it is still under construction. The buyer commits to the purchase based on architectural plans, specifications, CGI images, and (in some cases) a show home or apartment. Completion typically occurs 12–36 months after exchange of contracts.

The UK new-build market is substantial, with approximately 200,000–250,000 new homes completed annually. Major housebuilders like Barratt, Persimmon, Taylor Wimpey, and Berkeley Group sell a significant proportion of their output off-plan, as do smaller developers and build-to-rent operators.

Benefits of Buying Off-Plan

Below-market pricing

Developers often offer early-bird discounts of 5–15% to generate sales momentum and secure development finance. These prices may represent genuine value if the market rises during construction.

Capital appreciation during build

In a rising market, the property may be worth more at completion than the purchase price. Early buyers in phases 1–2 of large developments often see the strongest price growth as the area matures.

Customisation options

Early buyers can often choose finishes, kitchen layouts, flooring, and other specifications. This is particularly valuable for owner-occupiers.

NHBC warranty

New-build properties come with a structural warranty (usually 10 years via NHBC Buildmark), covering major structural defects and providing deposit protection.

Modern specifications

New builds comply with current building regulations, offering better energy efficiency (typically EPC B or above), modern safety features, and lower maintenance costs in the early years.

Risks & Downsides

Construction delays: Most developments complete later than initially estimated. Average delays of 3–6 months are common; some projects face delays of 12+ months.
Quality concerns: Snagging issues are widespread in new builds. The New Homes Quality Board has reported that many buyers experience defects requiring rectification.
Market risk: If property values fall during construction, the property may be worth less than the purchase price at completion, creating negative equity.
Developer insolvency: If the developer goes bust, completion may be delayed or impossible. Deposits should be protected under a warranty scheme.
New-build premium: New properties typically sell at a 10–20% premium over comparable existing homes. This premium may erode once the property is resold as "used."
Leasehold pitfalls: Many new-build flats (and some houses) are sold leasehold with potentially onerous terms. Check ground rent levels, escalation clauses, and service charge estimates carefully.

How to Vet a Developer

Due diligence on the developer is essential before committing to an off-plan purchase:

Companies House check: Review the developer's financial accounts, director history, and any connected companies. Look for healthy balance sheets and consistent profitability.
Track record: Research completed developments. Visit them in person if possible. Check online reviews and resident forums for quality feedback.
NHBC registration: Confirm the developer is registered with NHBC (or equivalent warranty provider like LABC, Premier Guarantee, or Checkmate).
New Homes Quality Board: Check if the developer is registered with the NHQB and adheres to the New Homes Quality Code.
Planning status: Verify that full planning permission has been granted for the development. Outline planning alone is insufficient.
Funding: For smaller developers, check whether development finance is in place. Unfunded developments carry higher risk of delays or abandonment.

Payment Structures & Deposits

The standard payment structure for UK off-plan purchases is relatively straightforward compared to markets like Dubai or Thailand:

Reservation fee: £500–£2,000 to secure the plot (usually deducted from the deposit)
Exchange deposit: 10% of the purchase price at exchange of contracts (within 28 days of reservation)
Balance: Remaining 90% paid on legal completion (when the property is built and ready)

Some developers offer staged payment plans, particularly for larger developments or investment-targeted schemes. Always ensure any deposits paid are protected under the developer's warranty scheme and held by an independent solicitor.

Consumer Protections

UK off-plan buyers benefit from several consumer protection mechanisms:

NHBC Buildmark Warranty

Covers deposit protection (pre-completion), developer defect rectification (years 1-2), and structural insurance (years 3-10). Most lenders require NHBC or equivalent cover.

New Homes Quality Code

Introduced in 2022, the Code sets standards for sales practices, after-care, and complaints handling. Developers registered with the NHQB must comply.

New Homes Ombudsman

An independent redress scheme for buyers of new-build homes, handling complaints about construction quality, sales practices, and after-care.

Snagging & Completion

A snagging inspection is essential before or immediately after completion. This identifies defects ranging from cosmetic issues (paint, scratches, uneven tiles) to more serious problems (plumbing leaks, poor window sealing, uneven floors). Professional snagging inspectors typically charge £300–£600 and will produce a detailed report with photographs.

Under the NHBC Buildmark warranty, the developer must rectify snagging items reported within the first two years. It is advisable to report issues promptly and in writing, keeping copies of all correspondence. If the developer fails to address legitimate defects, the NHBC Resolution Service can mediate.

Frequently Asked Questions

Off-plan purchases carry specific risks including construction delays (averaging 3–6 months beyond estimated dates), potential quality issues, the risk of developer insolvency, and market value changes between exchange and completion. However, UK consumer protections - NHBC warranties, deposit protection schemes, and new-build ombudsman - provide significant safeguards compared to many other markets.

PropertyWiki Team

Editorial Team

Published: April 7, 2026

Updated: April 7, 2026

PropertyWiki's editorial team provides data-driven property investment analysis and guides for UK buyers and investors.