How to Choose a London New-Build: 8 Criteria Every Overseas Buyer Should Check

Eight criteria for evaluating a London new-build development

When overseas buyers approach a London new-build, the instinctive focus is the apartment itself — the floor plan, the views, the specification. This is understandable, but it is not where the real risk sits. The developer behind the project, the legal protections embedded in the contract, the warranty structure, and the tenure terms of what you are buying all deserve at least as much scrutiny as the show suite.

In a market where construction insolvencies in England and Wales reached 3,827 in the twelve months to March 2026 — more than in any other industry, and at a rate exceeding 300 firms per month — the question of who is building a development is no longer academic. IREIS Properties works with overseas buyers from Taiwan, Hong Kong and Singapore who are navigating London’s new-build market from a distance. This guide sets out the eight criteria we walk clients through before any purchase decision is made.

1. The developer’s financial standing and track record

Start with the developer, not the development. A well-designed scheme offers little protection if the developer runs into financial difficulty before the keys are handed over.

Begin by verifying that the developer is registered with the National House Building Council (NHBC) — this is a basic prerequisite for the warranty coverage described below, and NHBC registration requires an assessment of the developer’s financial strength before it is granted. Beyond registration, review the developer’s track record: how many schemes have they completed, delivered on time, and to the stated specification? Specialist advisers and your solicitor can review financial accounts filed at Companies House, examining liquidity ratios, profitability margins and any outstanding legal claims.

A note of caution: due diligence on the main contracting company alone is no longer sufficient. Liabilities from associated companies can affect the solvency of the entity you are dealing with, and the consequences of a developer failure mid-build can be severe even when structural insurance is in place. In the current cycle, experienced main contractors have become highly selective about which schemes they take on — another reason to verify that the developer has confirmed a credible, adequately capitalised contractor.

2. The NHBC Buildmark warranty — what it covers and what it does not

Approximately 80% of new builds in England, Wales and Scotland carry an NHBC Buildmark warranty. Understanding what it covers matters, because it is not a blanket guarantee of workmanship quality.

The Buildmark warranty runs in two distinct phases. In years 1 and 2, the developer is responsible for remedying defects that do not meet NHBC’s technical standards — this is the builder warranty period, and its value depends on the developer still being solvent and responsive. From year 3 to year 10, NHBC itself provides structural insurance, covering major defects to the load-bearing structure including foundations, floors, walls and the roof frame.

Before legal completion, the Buildmark also provides deposit protection of up to £100,000 against the developer’s insolvency. Other recognised providers — including LABC Warranty and Premier Guarantee — offer comparable structures. Before exchanging contracts, confirm with your solicitor which warranty is in place, verify that the developer is registered with that warrantor, and understand the deposit protection ceiling.

3. Contract protections — long-stop date, deposit structure and cooling-off period

Off-plan purchases involve exchanging contracts — and paying a deposit, typically 10% of the purchase price — before the property is built. Three contract terms deserve particular attention.

The long-stop date is your contractual safety net: if the developer has not legally completed the property by this date, you are entitled to withdraw and recover your deposit in full. Make sure the contract includes one, and that the period is reasonable — solicitors typically advise no more than 12 to 18 months beyond the developer’s estimated completion date. In a market where regulatory delays are extending programme timelines for many London schemes, a realistic long-stop date carries real value.

Under the New Homes Quality Code, you also have a 14-day cooling-off period from the date of reservation, during which you can withdraw and recover your reservation fee in full. A reservation fee typically ranges from £500 to £2,000 and is deducted from the purchase price on completion. Verify that the reservation agreement explicitly states the cooling-off right.

Finally, confirm how your deposit will be held. It should be protected under the NHBC Buildmark scheme, held by your solicitor in a segregated client account, or covered by another recognised scheme. Money paid directly to the developer’s operating account is not protected.

4. Building Safety Act compliance for taller developments

For developments of 18 metres or more in height — or 7 or more storeys — the Building Safety Act 2022 introduces a Gateway regime that bears directly on timing and risk. Gateway 2 requires a developer to obtain approval from the Building Safety Regulator before construction work can begin, submitting full building plans, principal designer and contractor competency statements, and risk management strategies.

Since the regime launched, many applications have experienced significant delays. For overseas buyers considering a higher-rise development, it is worth asking the developer’s agent at what stage the Gateway 2 application currently sits, and factoring regulatory timeline risk into your assessment of the estimated completion date — and into the long-stop date you negotiate.

The Act also introduced ongoing obligations on an accountable person who takes legal responsibility for fire and structural safety during the building’s occupation — a significant evolution in how high-rise residential buildings are regulated throughout their lifetime, not only during construction.

5. Tenure structure, lease length and service charge

What you are legally buying matters as much as the property itself. Flats in the UK are almost universally leasehold — you hold the right to occupy for a fixed term while the land remains the freeholder’s. Before exchanging, confirm the lease length (most new London builds offer 999-year or 250-year leases), verify that the ground rent is a genuine peppercorn under the 2022 reform, and request an estimate of the annual service charge in writing.

Service charges in central London new-builds with concierge, gym and pool facilities can reach £5 to £10 per square foot per year. This is not hidden — but it is frequently underestimated by first-time buyers of London apartments. For a detailed primer on tenure terms, ground rent reform and lease length risk, see the IREIS Properties guide to UK leasehold and freehold explained.

On stamp duty: overseas buyers in England and Wales are subject to a 2% non-resident surcharge on top of the standard residential rates, and a further surcharge applies if you already own a property anywhere in the world. The total liability varies considerably by buyer profile and purchase price — use our UK stamp duty calculator to calculate your exact figure, and confirm with your solicitor.

6. Location, connectivity and regeneration trajectory

Location fundamentals compound over time. For overseas buyers, three questions matter most: which TfL zone is the development in (this affects commute costs and shapes the rental demand profile); what is the walking time to the nearest Tube, Elizabeth line or Overground station; and is the surrounding area in an active regeneration trajectory backed by committed infrastructure investment?

Where a developer makes a specific claim about a nearby transport upgrade or planning commitment, verify it independently through the relevant local authority’s planning portal — do not rely solely on the marketing brochure. If you cannot visit the site, IREIS Properties can arrange on-the-ground footage and a local context assessment so you can evaluate the immediate surroundings before committing.

7. The specification and the snagging process

Not all new-build specifications are equivalent. Before exchanging, review the developer’s specification in detail: kitchen units and appliances, bathroom fittings, flooring, glazing specification, storage provision, and the size and usability of any outdoor space. For overseas buyers who cannot attend a show suite in person, IREIS Properties can arrange viewings and video walkthroughs to assess specification quality against what the developer is contractually promising.

Even well-managed developments typically deliver units with minor defects at handover — a process known as snagging. The developer’s warranty obligation in years 1 and 2 covers defects that do not meet NHBC technical standards, so documenting and reporting issues in writing promptly after handover is important. Consider commissioning an independent snagging inspection from a professional with no commercial relationship with the developer; they will systematically record defects that the developer is then contractually obliged to remedy.

8. How the purchase works from abroad

Overseas buyers can complete a London new-build purchase entirely remotely — UK conveyancing is designed to run by post, email and video, and neither the exchange of contracts nor final completion requires you to be physically present in Britain. The standard mechanism is a Power of Attorney (POA), which authorises your UK solicitor to sign documents on your behalf when a wet-ink signature is required within the UK.

The other essential requirement is source-of-funds documentation under the Money Laundering Regulations 2017: a complete, traceable paper trail showing where the purchase money originated and how it was accumulated. Non-resident buyers often face enhanced due diligence requirements, so preparing documentation from the outset — rather than when the solicitor first asks — is the most effective way to keep the transaction on schedule.

For a step-by-step account of the full purchase sequence — from reservation through to exchange, completion and post-purchase lettings setup — see the IREIS Properties guide to the complete UK property buying process for overseas buyers.

Applying these criteria in practice

Choosing a London new-build is not simply a question of which development you prefer. It is a question of which development meets the due diligence standards that protect your investment over the long term — developer robustness, warranty structure, contract protections, regulatory compliance, tenure clarity and location fundamentals all need to align before committing.

IREIS Properties advises overseas buyers through the full journey: initial shortlist, on-the-ground viewings and specification assessment, solicitor coordination, contract review, and lettings management after completion. Browse our current London new-build listings, explore the buying guides hub for further research, or contact an IREIS Properties adviser to discuss a specific development against the criteria above.