7 Best Office Design & Build Companies in London (2026)
If you're looking for an office design and build company for a fit out or refurbishment in London, the choice can feel overwhelming — there are dozens of capable firms, all saying similar things.
We've been designing and building workspaces in London since 2008, so we know the field well. The honest truth: there's no single "best" office design and build company. Each has different strengths, and the right firm depends on your brief, budget and building.
So this guide does two things: it introduces seven of the best fit-out companies in London in 2026, and it explains the six factors that actually matter when you choose. Here's the shortlist at a glance:
Company | Founded | Head office | Known for |
Oktra | 1995 | London EC1N | Large-scale London & UK fit-out |
Morgan Lovell | 1977 | London W1F | Design & build, part of Morgan Sindall |
Maris | 1997 | London SE1 | High-volume UK design & build |
Area | 2000 | London SE1 | UK & Europe, Fourfront Group |
Peldon Rose | 1987 | London EC1V | Full strategy, design & fit-out |
Thirdway | 2009 | London EC1V | Design-led, sustainability focus |
AIS | 1979 | London EC4M | Workplace design & build, international reach |
The 7 best office design & build companies in London (2026)
Oktra
Founded: 1995
Head office: London, EC1N
About: One of the UK's largest office design and build firms, Oktra runs a big in-house design team with a group dedicated to projects inside the M25, delivering Cat A and Cat B fit-outs across London and nationally.
Morgan Lovell
Founded: 1977
Head office: London, W1F
About: The workplace design-and-build arm of the FTSE-250 Morgan Sindall Group, Morgan Lovell pairs design and build under one roof with the financial backing of a major listed contractor, working across London and the South East.
Maris
Founded: 1997
Head office: London, SE1
About: One of the largest design and build companies in the UK, Maris has delivered more than 10,000 office design, fit-out and refurbishment projects ranging from 1,500 to 120,000 sq ft.
Area
Founded: 2000
Head office: London, SE1
About: Part of the Fourfront Group, Area delivers office design, fit-out and refurbishment across the UK and Europe, with a full end-to-end service.
Peldon Rose
Founded: 1987
Head office: London, EC1V
About: A London design and build firm of more than 30 years, Peldon Rose covers workplace strategy, design and fit-out with in-house specialists across every discipline.
Thirdway
Founded: 2009
Head office: London, EC1V
About: Design-led and increasingly known for sustainability, Thirdway has grown from an interiors studio into a full fit-out and refurbishment business, with award-winning, low-carbon workplaces.
AIS
Founded: 1979
Head office: London, EC4M
About: A long-established London design and build firm with international reach, AIS focuses on workplaces that lift productivity and wellbeing.
How to choose the best design & build company for you
Don't ask "which is the best?" — ask "which is the best for my project?". Decide which of these six factors matter most to you, then weigh each firm against them:
Expertise — does their experience match the unusual or technical parts of your brief?
Portfolio — not just how good it looks, but how relevant it is to your sector, size and style.
Design — can they translate your culture and ways of working into the space, not just make it pretty?
Delivery — the most overlooked factor. Ask for a detailed, realistic programme before you commit; delivery matters more than the render.
Pricing — check both the up-front price and how they handle cost during the project. A fixed price agreed before work starts protects you from mid-project surprises.
Customer care — how will they stay accountable? A pre-agreed communication framework and genuine aftercare separate the best from the rest.
Where Zentura fits
For balance: we're one of the firms competing for this work too. Our approach is fixed-price design and build — one accountable team, a price agreed before work starts, delivered on time, on brief and on budget, and backed by a 3-year post-contract care programme. Whoever you choose, look for that same certainty. See our office fit out service or explore what a fit out costs.
Working out your budget? Before you brief anyone, get a sense of the numbers with the Zentura Office Budget Calculator.
Frequently asked questions
Who are the best office fit out companies in London?
Well-regarded London office design and build firms in 2026 include Oktra, Morgan Lovell, Maris, Area, Peldon Rose, Thirdway and AIS — alongside Zentura. The right one depends on your brief, budget and building rather than any single ranking.
How do I choose an office design and build company?
Weigh each firm on expertise, portfolio relevance, design, delivery track record, pricing transparency and customer care. Decide which matter most for your project, and favour firms offering a fixed price agreed before work starts.
How much does it cost to fit out an office in London?
A London office fit out typically costs £75–£150 per square foot in 2026 depending on specification. See our office fit out cost guide for the full breakdown.
Comparing design and build firms? Talk to Zentura about a fixed-price fit out delivered with zero surprises — get in touch.
