London renovation companies: 10 checks

No independent league table can identify the right renovation company for every London home. Firms differ in scale, service model, geography and project type. A townhouse refurbishment and a listed mansion do not need the same team. Neither do a super-prime apartment and a large residential development. The firm that is right for one is often wrong for the next.

So this guide does not rank anybody. It sets out the ten things a homeowner should actually check. They come in the order they matter. Each one shows what a good answer looks like.

Why a league table cannot answer this

Any published ranking of renovation companies is either an advertisement or a guess. Nobody audits the projects, nobody sees the final accounts, and nobody knows your building. Two firms can look identical in a portfolio. Their contracts can carry completely different responsibilities. That is what decides how your project goes.

The comparison that works is evidence against a written brief. Ask every shortlisted firm the same ten questions and compare the answers.

Ten checks before you appoint

1. Completed projects like yours

Not a portfolio of images. Instead, finished work of comparable property type, age and listing status. The access and level of finish should be comparable too. Ask what the firm designed, what it built and what it subcontracted. Review the NU Projects portfolio as an example. It shows what that evidence should look like.

2. Who owns each responsibility

Architecture, structure, mechanical and electrical, joinery, interiors and site delivery. Ask for a written schedule of who owns each. The gaps between consultants are where delay, change and dispute begin.

3. Named senior people

Ask who leads the design and who holds the cost plan. Ask who runs the site. Get each answer by name. If the answer changes each time you ask, the structure is not settled.

4. What happens before construction starts

Surveys, planning strategy, technical design, structural coordination, MEP design, specification, cost planning and procurement. Starting on site with unresolved information looks like speed. It moves decisions into the most expensive stage of the job.

5. How the budget is built

A single figure tells you nothing. A cost plan should separate assumptions, exclusions, provisional allowances and professional fees. It should separate specialist packages, contingency and VAT too. And it should say when the price becomes firm. Our own construction rates are published by work type. They are in the NU Build Cost Calculator.

6. What is actually in the proposal

Two totals can look similar and cover very different scopes. Compare surveys, design stages, planning work, structural input and building services. Then temporary works, preliminaries, finishes, joinery, testing, documentation and aftercare. Go line by line.

7. How changes are controlled

Every project changes. Ask how a change is described, priced and approved. Ask how it is added to the programme before the work happens. And ask whether that is written down. Verbal instructions on site are how final accounts get out of hand.

8. Who coordinates the building services

Heating, cooling, ventilation, hot water, lighting, controls, data, security and audio visual all matter. Together they decide ceiling heights, joinery depths and where the grilles end up. Early MEP coordination protects the architecture. Late coordination costs you ceiling height.

9. How quality is recorded

Ask who signs off concealed work, waterproofing, services, setting out, samples and finishes. Ask how that is evidenced. Quality has to be captured while the work is still visible.

10. What happens after handover

Testing, commissioning, certification, operating information, a defects process and a named person to call. A renovation is not finished at practical completion.

Design and build or separate appointments?

Some clients prefer an architect-led tender with a separate contractor. Others want one accountable design-and-build team. Both work. What matters is that the responsibilities are explicit either way. Read architect or design and build, which should you choose for the trade-off.

How NU Projects is set up

NU Projects has operated since 2010 as a West London design-and-build company. Architecture, interior design, quantity surveying, MEP, construction and aftercare sit inside one team. So cost input arrives early. And there is a single point of accountability. The work is private residential renovations, extensions and basements rather than volume delivery.

See the £1.44m Chelsea house renovation for a completed example.

Frequently asked questions

Is there a reliable ranking of London renovation companies?

No. Nobody audits the projects or the final accounts, so any published order is marketing. Compare evidence against your own written brief instead.

Should I choose the lowest quotation?

Not without confirming that every firm has priced the same scope and specification. The responsibilities, allowances and exclusions must match too. A lower number usually means fewer responsibilities.

What matters most on a complex renovation?

Relevant completed evidence, named leadership and technical coordination. Then transparent cost control, disciplined change management and a proper handover.

Compare NU against your brief

When planning a substantial London renovation, book a private consultation with NU Projects. Ask us the same ten questions you ask every other firm on your list.