Protecting yourself when commissioning a new house or major build in London

Commissioning a new house, a self-build, or a major structural rebuild in London is one of the largest financial commitments most families make. The risks are not only construction quality - they include builder insolvency mid-project, weak payment schedules, and warranties that were never properly put in place. This guide summarises published consumer and warranty guidance so you can ask better questions before money leaves your account.

It is general information for London clients of house builders and major works contractors. It is not legal, lending or insurance advice. Have a solicitor review any building contract and warranty documents before you exchange or pay significant deposits.

Why warranty cover matters from day one

The Greater London Authority's Routes to redress page explains that most newly built homes are required to have a new-home warranty. Typical cover lasts about ten years and is commonly split into:

• an early period (often about two years) when the builder is responsible for remedying defects under the warranty arrangements;
• a later period (often years three to ten) focused mainly on structural issues such as foundations, roofs or ceilings.

The GLA notes that many London homes are covered by providers such as NHBC, Premier Guarantee or LABC Warranty, and that builders using these providers agree to the Consumer Code for Home Builders, which includes complaints procedures and an Independent Dispute Resolution Scheme for issues outside the warranty.

NHBC's Buildmark FAQs describe Buildmark as 10-year warranty and insurance cover for newly built or newly converted homes. They explain that Section 1 insolvency cover (for first owners who meet the policy conditions) may repay a lost deposit or the reasonable extra cost to finish construction if the builder becomes insolvent before completion - subject to financial limits and exclusions in the policy schedule. After legal completion, NHBC states that the total amount payable for claims is typically capped (for example, at the original purchase price up to a published upper limit such as GBP 1,000,000 - always read your own schedule). Confirm the live policy wording with your conveyancer; do not rely on a summary alone.

Consumer Code duties on deposits and pre-payments

The Consumer Code for Home Builders requires participating builders to explain how reservation fees, contract deposits and other pre-payments are protected, including arrangements to refund them if the builder goes out of business before completion. Ask for that explanation in writing. If a builder cannot say how your money is protected, treat that as a serious warning sign.

The Code's Independent Dispute Resolution Scheme is a further route after you have complained to the builder, subject to the Code's time limits (including referral windows published by the Code - check the current rules before you rely on them).

Contracts and staged payments

For bespoke new houses and major works, clients often use a formal building contract (for example a JCT form) with an architect or contract administrator. Payment chapters in standard forms typically cover interim certificates, payment notices and final accounts. Separately, Part II of the Housing Grants, Construction and Regeneration Act 1996 (the Construction Act) sets rules for construction contracts in England and Wales, including entitlements to stage payments for longer jobs, requirements for an adequate payment mechanism, and restrictions on pay-when-paid clauses. Industry summaries (such as those published by specialist construction solicitors discussing the Act) underline that parties should agree clear amounts, intervals and notice procedures.

Practical client protections to insist on:

• a written contract naming the parties, works, drawings, price basis, programme and insurance;
• stage payments linked to defined milestones or valuations - not open-ended cash calls;
• retention until practical completion and clearance of snags;
• evidence that the structural warranty provider has accepted the site and that cover will be in force for the finished home;
• clarity on who notifies Building Control and who owns design responsibility.

Never pay the entire contract sum before foundations are in, and be extremely cautious about large deposits to a thinly capitalised company with no warranty cover arranged.

Companies House and due diligence on the builder

Search the builder on Companies House. Look at incorporation date, filing history, charges and whether accounts are overdue. Combine that with TrustMark or new-home warranty registration checks, references from completed London projects, and proof of public liability and contractors' all-risks insurance. A glossy brochure is not a substitute for insolvency cover and a clear payment schedule.

Red flags on major London builds

• No structural warranty provider named before significant payments;
• Vague answers on how deposits are protected under the Consumer Code;
• Pressure to pay large sums in cash;
• Contract that omits stage payments, retention or dispute clauses;
• Builder unwilling to let your solicitor review the warranty offer before exchange;
• Companies House shows a newly formed company with no track record asking for a large deposit.

If the relationship breaks down

Follow the contract's notice provisions. For warranty issues after completion, the GLA's routes-to-redress page sets out contacting the builder in the early defect period and the warranty provider for later structural claims, with Financial Ombudsman routes for some warranty-provider service complaints. For Consumer Code breaches, use the builder's complaints process and then the Independent Dispute Resolution Scheme where eligible.

Protecting yourself is mostly paperwork done early: warranty offer, deposit protection explanation, staged payment plan, and a contract your solicitor has actually read.

Snagging, retention and living with a long programme

Major builds in London rarely finish on the first optimistic date in a marketing pack. Build weather delays, material lead times and local authority inspection slots into your cash-flow plan. Agree a practical completion definition in the contract: what must be finished, which certificates must be provided, and how snagging lists are raised and closed. Retention - a small percentage held back until snags are cleared - remains one of the simplest client protections when it is written clearly and not waived under pressure.

Before you release final funds, confirm that the warranty provider's cover is in place as promised, that Building Control completion documentation is available, and that operation manuals for boilers, MVHR and other systems have been handed over. Walk the property with your contract administrator or surveyor. Take dated photos of every room and elevation.

If the builder seeks acceleration payments mid-programme, ask what milestone has actually been achieved and how the warranty and insurance positions are affected. Acceleration that skips inspections is not a favour.

Planning, Building Control and neighbours

A new house or major rebuild in London will usually involve planning permission or permitted-development assessment, Building Regulations approval, and often Party Wall procedures. Your professional team should own that programme. As client, your job is to confirm that applications are actually submitted, fees paid, and decision notices stored - not merely promised. Warranty providers and lenders look for a clean compliance trail; missing paperwork at the end of a build is a painful way to discover gaps.

Talk to adjoining owners early if the works are noisy or involve scaffolding over boundaries. Good neighbour relations will not replace a warranty, but they reduce the chance of injunctions and programme blow-outs.

Sources checked 15 October 2026: GLA Routes to redress; NHBC Buildmark FAQs; Consumer Code requirements; Consumer Code IDRS. Always read your own policy and contract; this is not legal advice.