Best London Construction Project Management Firms (2026): An Honest Roundup

If you've searched "best construction project management london" lately, you've probably noticed a pattern. Every page that ranks is the company's own page, dressed up as a comparison. The "top 10" list at the top of Google is written by firm number one, who somehow comes out on top. The directory pages list anyone who paid for a profile. None of it helps you decide who should manage your £100k kitchen extension or £250k loft and side return.

So here's a roundup written differently. All Well Property Services (the company that publishes this site) is one of the firms included in this list. We've disclosed which entry is ours and used the same evaluation criteria across all firms — primarily public-facing reputation, project size focus, geographic focus, and contract structure. We don't name specific competitor companies, because picking three firms out of hundreds in London would be arbitrary and unfair. Instead, we describe categories of firm with verifiable attributes (chartered status, fee structures, accreditations) so you know what you're looking at when you start ringing round.

This article covers four ways to run a London residential renovation: design-and-build firms (one company handles drawings, planning and construction), architect-led project management (an architect manages a separate contractor on your behalf), dedicated project management firms (a PM company runs the project but doesn't draw or build), and construction management firms (a lead contractor coordinates trade sub-contractors under a cost-plus arrangement). Each works. Each has trade-offs. The right choice depends on your budget, your appetite for cost risk, and how much of your own time you want to spend running things.

How we organised this list

We didn't rank firms 1 to 8 with little gold medals. That format is useful for cameras and broadband providers, where the product is identical and the differences are measurable. It's useless for construction, where the right firm for a Victorian terrace refurb in Dulwich is the wrong firm for a new-build apartment fit-out in Canary Wharf.

Instead, we've grouped firms by contract structure and scope. Within each category, the typical fee model, project size range, and watch-outs are roughly consistent across all firms in that group. Once you know which category fits your project, you can shortlist three or four firms in that category and compare them properly: references, site visits, written quotes on the same scope.

A quick health warning. The categories overlap at the edges. A design-and-build firm with an in-house architect competes with both architect-led PM and pure construction. A construction management firm with a tame architect on retainer competes with design-and-build. Treat the categories as starting points, not boxes.

Group A: Design and build firms

A design-and-build firm takes the project from sketch to handover under a single contract. You hire one company. They draw the plans, submit planning and Building Control, run the build, and hand you the keys. There's one phone number for the whole job and one company carrying the risk if something goes wrong.

Fee structure is almost always a fixed-price contract based on detailed drawings and a written specification. You sign for a number, you pay that number, variations are priced and approved in writing. A few firms work on cost-plus or open-book pricing for larger jobs, but the standard offer for a residential extension or loft is fixed price.

Project size sweet spot for most London design-and-build firms is £30k to £300k: kitchen extensions, side returns, loft conversions, full refurbs, bathroom suites. Above that, you tend to drift into specialist contractor territory or architect-led work. Below £20k, it's usually not worth the design overhead. A competent builder on a written quote will be cheaper.

Best for: homeowners who want one company accountable for the whole job, prefer cost certainty over flexibility, and don't want to project-manage their own architect–builder relationship. Watch-outs: design quality varies enormously between firms. Some have proper in-house architects (often RIBA-registered), some have a draughtsman and a CAD package. Ask to see drawings from a recent comparable project before you sign.

All Well Property Services (our firm, disclosed)

All Well Property Services Ltd was founded in 2020 by director Richard Pryce. Companies House number 12721034. Office at Unit 1 Limes Avenue, Anerley, London SE20 8QR. The company is NICEIC accredited (electrical), FENSA registered (windows and glazing), Gas Safe registered (boilers and gas work), and CHAS accredited (health and safety). 57 verified Google reviews, averaging 4.5 out of 5.

We operate exclusively on fixed-price contracts. One project manager is assigned at survey stage and stays with the job through to handover. No sales rep handover. No rotating site managers. Building Control sign-off is included on every project that needs it, not billed as a variation at the end. Typical project size is £30k to £200k.

Services: kitchen extensions, bathroom fitting, side return extensions, loft conversions, painter and decorator work, full property renovation, damp proofing, garage conversions, and end-of-tenancy painting. We cover 25 South East London boroughs. Direct line to Richard, the director, on every project. No PA. No account manager filter. Quotes are itemised on one page so you can compare line for line against another firm. More on the company background here, or request a quote and survey.

Other design-and-build options in London

London has several hundred design-and-build firms competing for residential work. The honest ones share a few traits worth checking. Registered at Companies House for at least five years (newer firms can be good but you have less to verify). Public Google reviews you can read, not testimonials hand-picked for the website. An in-house designer or RIBA Chartered Practice status if the firm leads with design. Relevant trade accreditations for the scope: NICEIC for electrical, FENSA for glazing, Gas Safe for gas, TrustMark for general building work.

Established South London design-and-build firms typically charge fixed prices that work out at £2,500 to £3,500 per square metre for a standard ground-floor extension, depending on specification. Central and West London firms can be 20% to 40% higher for equivalent work. A quote substantially below the local range usually means something is missing from the spec — Building Control fees, structural calcs, decoration, a kitchen budget, VAT.

Group B: Architect-led project management

In this model you hire a chartered architect (RIBA-registered, ideally a Chartered Practice) to do the design and planning, then the same practice acts as contract administrator during the build. The construction itself is tendered to a separate main contractor under a standard JCT contract. The architect runs site meetings, issues instructions, approves valuations for payment, and certifies practical completion.

Fee structure for the architect is typically 8% to 15% of the construction cost, sometimes broken into work stages (RIBA stages 1 to 7). The contractor's cost is separate and usually tendered fixed price on the architect's drawings and specification. So your total professional fees plus build cost are roughly 110% to 115% of what a design-and-build firm would quote for the equivalent finished result.

Project size sweet spot is £200k upwards, or any project where design quality genuinely matters — a Conservation Area extension, a listed building alteration, an architecturally ambitious refurb. Below £150k the architect's percentage fee starts to feel disproportionate.

Best for: homeowners who want serious design input, who are willing to pay for professional oversight on site, and who'd rather have an independent third party signing off the builder's work than rely on the builder to mark their own homework. Watch-outs: not all architects enjoy or are good at the project management side of the job. Ask candidly how many comparable projects they've contract-administered to completion. RIBA's own member finder is the reliable starting point.

Group C: Dedicated project management firms

A dedicated PM firm runs the project on your behalf but doesn't design and doesn't build. They appoint the architect (or take your existing one), tender the construction work to contractors, negotiate the contract, then sit on your side of the table during the build, chasing progress, scrutinising valuations, holding the contractor to programme. Many are run by chartered quantity surveyors (RICS members) and bring a cost-control discipline that design-and-build firms and architects often lack.

Fee structure varies. Some PM firms charge a percentage of construction cost (typically 3% to 6%). Others charge a fixed monthly fee for the duration of the project. A few work on a success-fee basis tied to cost savings against budget, though this is rarer in residential than commercial work.

Project size sweet spot is £500k upwards. Below that the PM fee is hard to justify against the savings; a £100k extension simply doesn't have enough cost in it to fund a separate professional team. Above £500k, and especially for whole-house refurbs and new-builds, a good PM can save more than they cost by running a competitive tender, spotting valuation errors, and keeping the contractor honest on variations.

Best for: large or complex residential projects, homeowners with no time to attend weekly site meetings, and projects where the cost risk is high enough to warrant a dedicated cost-control function. Watch-outs: a PM firm without construction experience can be a phone relay station rather than a problem-solver. Ask whether the PM assigned to your job has trade or site management background.

Group D: Construction management firms

Construction management (CM) is a different commercial model. The CM firm acts as your lead contractor but doesn't actually employ the trades directly. Instead they break the project into work packages (groundworks, structure, M&E, joinery, finishes), tender each package to specialist sub-contractors, and coordinate the trades on site. You pay the sub-contractors directly, plus a management fee to the CM firm (typically 8% to 15% of construction cost).

This is open-book, cost-plus pricing. You see every sub-contractor quote. You see every invoice. The upside is transparency and the ability to value-engineer in real time — if the joinery package comes in £15k over budget, you can swap specifications or sub-contractors before signing. The downside is that there's no fixed price. Your final cost is whatever the sub-contractors bill, plus the management fee on top. You carry the cost risk that a fixed-price contractor would carry for you.

Project size sweet spot is £400k and up, or any project where the design is still evolving and a fixed price would force premature decisions. CM is common on London prime residential refurbs in Notting Hill, Chelsea, Hampstead and similar postcodes where specifications are bespoke and budgets have headroom.

Best for: high-value refurbs with flexible budgets, design-led projects where the client wants to make late-stage decisions, and homeowners who want full visibility on every cost. Watch-outs: cost-plus contracts famously overrun. Without a strong PM or QS on your side checking valuations, the bill grows. Ask for the management fee as a fixed sum (not a percentage) on jobs over £1m to remove the incentive for the CM firm to let costs drift upward.

How to evaluate a project management firm

Whichever category you shortlist from, the same checks apply. These eight matter more than any marketing copy on a website.

1. Companies House registration. Look the firm up at companieshouse.gov.uk. Check the registered date, director history, accounts filings, and any past insolvencies among the directors. A firm that's been trading under the same registration for five-plus years has survived at least one recession.
2. Public reviews on Google. Read them. All of them, including the bad ones. A firm with 5.0 out of 5.0 from twelve reviews is harder to read than a firm with 4.5 from sixty. Look at how the company responds to criticism — that tells you how they'll behave when something goes wrong on your job.
3. Trade accreditations relevant to your scope. NICEIC for electrical work. FENSA for windows. Gas Safe for boilers and gas. RICS for quantity surveying. RIBA for architecture. CHAS for site safety. TrustMark for general building. Each one is an independent body that checks the work, not a paid logo.
4. Contract structure. Fixed-price gives you cost certainty and shifts overrun risk to the contractor. Cost-plus gives you transparency and shifts overrun risk to you. Decide which you want before you start quoting, because the firms in each category are different. Our service pages explain how we contract on each scope.
5. Single project manager from start to finish. Ask who runs your job. If it's a salesperson at quote stage and a different site manager after you sign, you'll spend the first month re-explaining the spec.
6. Building Control sign-off included. Building Control is mandatory on most extensions, lofts and structural work. If it's listed as "client to arrange" or "variation if required," it'll cost you £400 to £1,200 at the end and the firm has no skin in passing inspection first time.
7. Public liability insurance limit. £2 million is the residential minimum. £5 million is sensible for jobs over £100k. Ask to see the certificate, not just hear that they have one.
8. Direct contact with the principal or director. On a job worth six figures of your money, you should be able to ring the person whose name is over the door. If you can't get past a PA at quote stage, you won't get past one when there's a problem.

Why we wrote this list

Most "best builders in London" pages are sales pages dressed up as comparisons. The firm that wrote the page ranks first. The "other options" are either fake (made-up names with no Companies House record) or chosen because they're obviously inferior. The reader leaves none the wiser, having read 1,500 words of disguised marketing.

This list is meant to be useful even for a homeowner who chooses another firm. The four categories above cover roughly 95% of how residential projects in London get delivered. If you understand which category fits your job, you can ignore the 80% of firms that don't fit and have a sensible conversation with the 20% that do. That's good for you. It's also good for us — we'd rather quote a project that suits our model than win one we shouldn't have. More on how we work here.

Get a free quote

If a fixed-price design-and-build firm sounds like the right fit for your project, ring 020 3920 9617 or request a quote and survey. Richard will be the person on the call. Quotes are itemised, written, and good for 30 days. No deposit to quote, no obligation to proceed.