Office fit out is the work that turns an empty floor into a working office, or a working office into a better one. It spans two very different markets: landlord Cat A programmes measured in tens of thousands of square feet, and occupier Cat B projects where a 40 person company needs a space that reflects who they are. The companies below cover both, and this page groups them by the project size they are built for so you are not comparing a £200m contractor with a £200k studio.
Every firm listed has been checked against public records. Listings are free and the order within each size band is alphabetical, not paid.
The best fit out companies own the whole journey: workplace strategy, space planning, design, construction, furniture and the move. That single point of responsibility is the main reason occupiers choose design and build over appointing an architect and tendering the construction separately. The trade off is less independent design challenge and a contract where the same firm sets the spec and delivers it, so a clear brief and a fixed price matter more.
If you already have a design or an architect, you want a fit out contractor rather than a design and build firm. Several companies here operate in both modes; check the services tags on each profile.
Who owns the design risk if the scheme does not get landlord approval? What is included in the square foot rate and what sits in provisional sums? How is furniture procured and is there a margin on it? What is the defects period and who do you call in month nine? Which projects in the last 18 months were within 30% of your size, and can you speak to those clients?
Paid placements, clearly labelled. Featured firms are still verified the same way and still sit in the alphabetical list below.
Top of office fit out london: companies and contractors compared with direct contact buttons on the card. Six slots per size band, first come first served.
See featured listingsTop of office fit out london: companies and contractors compared with direct contact buttons on the card. Six slots per size band, first come first served.
See featured listingsTop of office fit out london: companies and contractors compared with direct contact buttons on the card. Six slots per size band, first come first served.
See featured listingsGrouped by the floor areas each firm is set up to deliver, because that is the first thing that rules a contractor in or out. Alphabetical within each band, featured firms included, so nothing is hidden behind a paywall.
Typical projects £50k to £500k for scale ups, professional services and creative firms. One team designs, builds and furnishes.
Sustainability specialist D&B. Biophilic design. Green materials. Old Street tech hub location.
Fit out, boutique band.
Cat A vacant office refurbishment for landlords, developers and agents. Fast professional turnaround.
Refurbishment led, boutique band, trading since 2006.
Low carbon fit out solutions. Energy performance upgrades. EPC improvements.
Refurbishment led, boutique band.
Sustainable interior retrofit specialist. Single source for all services. Ongoing churn management and facilities support.
Refurbishment led, boutique band.
500+ completed projects.
Refurbishment led, boutique band, trading since 2012. Names Three and Robert Walters among its clients.
Flat management structure. Diverse sectors (banks, recruitment, law firms, hotels, education). Fast track delivery. 25+ years.
Refurbishment led, boutique band, trading since 2000.
Commercial contractor for tenants, landlords & architects. City of London and West London specialist.
Refurbishment led, boutique band, trading since 2001.
Turnkey office fit out. Medical fit out capability. Free complementary site visits. London, Kent, Surrey, Sussex.
Refurbishment led, boutique band. Names Goalhanger and Allergy Centre of Excellence among its clients.
250+ completed projects. Instant online fit out cost calculator. Multi sector (commercial + healthcare + retail). Phased works.
Refurbishment led, boutique band, trading since 2010. Names Children with Cancer UK and Mimecast among its clients.
40+ years. Director is President of the FIS board. School refurbishment specialist. Bespoke joinery.
Refurbishment led, boutique band, trading since 1985.
Estate agent interior design. Healthcare/dental surgery refurbishment. In house branding services.
Cat A and Cat B, boutique band, trading since 1990. Names Bang & Olufsen and Samsung among its clients.
High end luxury office refurbishment. Bespoke designs. Lifetime guarantee on work. City of London focus.
Refurbishment led, boutique band, trading since 2000.
Economically priced fit outs for SMEs. Offices 1,000 to 10,000 sq ft. Owner operated (Crispin Maby, 20+ years experience).
Refurbishment led, boutique band, trading since 2002. Names Opera Gallery and Liberty of London among its clients.
Family run, independently owned. Cat B fit outs. Landlord refurbishments. Nationwide capability from small base.
Refurbishment led, boutique band. Names Begbies Traynor/Eddisons and QA among its clients.
London's only full service workplace consultancy specifically for SMEs. Limits to 5 projects at a time. Offsets 20 tonnes of carbon per £200k spent.
Design and build, boutique band.
People first approach. Educational sector strength. Acoustic furniture.
Cat A and Cat B, boutique band, trading since 2001.
Consultancy led. Agile working design. Research based approach. Spatial feasibility studies.
Refurbishment led, boutique band. Names OMD UK and MOO.com among its clients.
The core of the London occupier market. £300k to £5m projects, usually design and build, with dedicated project managers.
Multi sector fit out delivery with UK and Asia reach.
Fit out, mid market band, 50–200 staff.
Global delivery capability for multinational clients. 45+ years experience.
Design and build, mid market band, trading since 1979.
Landlord Cat A/A+ refurbishment specialist. Refurbishment of occupied buildings.
Cat A and Cat B, mid market band. Names Revantage Europe among its clients.
Coworking/flex space, education, laboratory fit out. Founders of The United Workplace global network. 10+ offices across Europe.
Refurbishment led, mid market band, trading since 2000, part of Fourfront Group, 250+ (group) staff, B Corp certified. Names Citrix and Infosys among its clients.
End to end refurbishment. 12 month defect period aftercare. Global brand client base.
Design and build, mid market band, trading since 2001. Names Hugo Boss and Airbnb among its clients.
Scalable services for any project size. Dedicated project managers. Budget flexibility. Greater London.
Refurbishment led, mid market band.
Defect free delivery ethos. Projects £1m to £50m+. Fiercely independent. Directly employs many tradespeople.
Design and build, mid market band, trading since 2000. Names Virgin Media and O2 among its clients.
70%+ repeat business. Hybrid workspace design.
Cat A and Cat B, mid market band, trading since 1996, 120+ staff, employee owned. Names AQA and Flutter/Paddy Power among its clients.
Office AND laboratory design & build. Science/biotech sector strength. Cambridge Oxford Arc and London focus.
Design and build, mid market band, trading since 2000, 60+ staff.
Nearly 70 years in business. Project range £50,000 to £30 million. Cat A & Cat B fit out. Public sector.
Refurbishment led, mid market band, trading since 1955. Names Legal & General and Crown Estate among its clients.
Directly employs own tradesmen (rare in sector). Strong charity/not for profit sector presence.
Design and build, mid market band, trading since 1978. Names Shelter and L'Oréal among its clients.
Cut & carve refurbishments (complex, high impact). B Corp values. National multi site rollouts.
Design and build, mid market band, trading since 1998.
Start up and incubator spaces. Publishing sector. Master planning. 20+ years.
Fit out, mid market band, trading since 2005. Names Pan Macmillan and Little Brown Book Group among its clients.
Independent. Education/university/school fit outs. Change of use projects. Based in Clerkenwell.
Refurbishment led, mid market band, trading since 2006. Names Patrizia and Cushman & Wakefield among its clients.
Fixed price quotes. Guaranteed delivery programmes. Central London focus (Farringdon, Clerkenwell, Piccadilly, Soho, Mayfair).
Cat A and Cat B, mid market band, trading since 2014.
Sustainability first. £150k annual sustainability commitment. VR walkthroughs. Flex/coworking design.
Fit out, mid market band, trading since 1990, 50–200 staff, B Corp certified. Names Osborne Clarke among its clients.
Furniture consultancy in DNA. Financial services and legal sector strength.
Refurbishment led, mid market band, trading since 2004, ~15–16 staff.
Eco conscious approach. Works in listed central London buildings. London, Essex, Surrey, Hertfordshire, Hampshire.
Refurbishment led, mid market band.
One stop shop with strong sub contractor network and in house tradesmen.
Design and build, mid market band.
10,000+ projects completed.
Design and build, mid market band, trading since 1977. Names Lacoste and ServiceNow among its clients.
Landlord fit out specialists. Cat A+ plug and play spaces. People centric approach. In house tradespeople.
Cat A and Cat B, mid market band, trading since 1990.
Collaborative 6 step process. 3D visualisation. Award winning with 35+ years in the industry.
Refurbishment led, mid market band, trading since 1990.
Evidence based design. Agile working pioneer. One of the oldest firms in the market (72+ years).
Cat A and Cat B, mid market band, trading since 1953. Names Mount Street LLP and Honda among its clients.
Design & build exclusively. Coworking/flex design. University refurbishment.
Cat A and Cat B, mid market band, trading since 1995, B Corp certified. Names Gymshark and Adidas among its clients.
Three divisions: Lite (under £500k), Interiors (larger schemes), Regions (Cambridge/Home Counties). Wellness driven design.
Design and build, mid market band, trading since 1997, ~100–150 staff. Names Tech Companies among its clients.
End to end bespoke design & build. In house M&E team. 30+ years London specific experience.
Design and build, mid market band, trading since 1987, ~120–148 staff. Names Hampshire Trust Bank and Aristocrat among its clients.
High end institutional fit outs. Education, commercial, and cultural sectors.
Fit out, mid market band. Names London College of Fashion and University of the Arts among its clients.
Integrated services (fit out + M&E + IT infrastructure). London, Berkshire, Surrey, Kent coverage.
Design and build, mid market band. Names AVMI and CNBC London among its clients.
Free office design on all projects. Crittall glass partitions. Bespoke joinery. National coverage from Clerkenwell base.
Refurbishment led, mid market band, trading since 2000.
Luxury/high end refurbishment in prime central London. Family run. Tiered packages (basic to premium).
Refurbishment led, mid market band, trading since 2014.
RIBA qualified design team. Biophilic design. Activity based working. Multi sector (offices, schools, industrial). 30+ years.
Cat A and Cat B, mid market band, trading since 1993. Names Hudl and Arch Insurance among its clients.
25+ years experience across London, Manchester and Hampshire offices.
Design and build, mid market band, trading since 1990. Names Clearwater International and Tata Communications among its clients.
International luxury brands. Prestigious capital projects across Dublin, London and Middle East.
Design and build, mid market band, trading since 2004.
Part of Thirdway Group diversified across architecture, managed workspace, and furniture.
Refurbishment led, mid market band, trading since 2009, part of Thirdway Group.
Heritage buildings to modern developments. 15% faster than industry average. 1,000 to 50,000 sq ft projects.
Design and build, mid market band, trading since 2000.
Right first time mindset. Manages multiple trades in house. Multi year client relationships.
Design and build, mid market band. Names Spaces/IWG Plc and AutoTrader among its clients.
4D Approach (Define, Design, Deliver, Devote). Fixed price guarantees. 3 year Zencare aftercare warranty. 5% profits donated to charity.
Design and build, mid market band, trading since 2008, ~30 staff. Names Legal Sector among its clients.
Landlord Cat A programmes, corporate headquarters and multi floor phased schemes. Usually with an independent architect and cost consultant.
Global operation with 60+ years' experience. B2B focused.
Fit out, enterprise band, trading since 1965.
Global workplace strategy and design. Biophilic design, WELL and green building certification. Research driven approach.
Fit out, enterprise band.
High end corporate fit outs, digital twin technology, programme driven delivery.
Fit out, enterprise band, trading since 1990, part of Mace Group. Names BMI and Major Financial Institutions among its clients.
Design led office fit out, workplace consultancy, biophilic design. 78%+ repeat business rate.
Refurbishment led, enterprise band, trading since 1977, part of Morgan Sindall Group plc, 201–500 staff. Names UniCredit and Greystar among its clients.
UK's leading fit out specialist. 91% net promoter score. Projects up to £200m.
Design and build, enterprise band, trading since 1942, part of Morgan Sindall Group plc, ~1,000 staff. Names Virgin Media O2 and GSK among its clients.
Major global player in corporate fit out with significant London operations.
Fit out, enterprise band, part of STO Building Group.
Global design & build backed by world's largest real estate services company. Operates in 20+ countries with local London expertise.
Fit out, enterprise band, part of JLL.
Integrated strategy design construction. London serves as EMEA HQ. Brands include Unispace Life Sciences, Bulb Interiors, Downstream.
Fit out, enterprise band, trading since 2010. Names Zoom Communications among its clients.
Heritage preservation, sustainable refurbishment, public sector. 500,000+ sq ft delivered in prestigious London locations.
Design and build, enterprise band, trading since 1852, part of Willmott Dixon Group, 4,000+ (group) staff.
Tell us the floor area, the budget and the timing and we will introduce three suitable firms from the directory. No fee, no obligation, and no company pays for the introduction.
Get matched| Office size | Typical Cat B cost | Typical programme on site | Contractor band |
|---|---|---|---|
| Under 3,000 sq ft | £50 to £120 per sq ft | 4 to 8 weeks | Boutique |
| 3,000 to 10,000 sq ft | £60 to £150 per sq ft | 8 to 16 weeks | Boutique or mid market |
| 10,000 to 30,000 sq ft | £80 to £150 per sq ft | 12 to 24 weeks | Mid market |
| 30,000 sq ft and above | £80 to £200+ per sq ft | 16 to 30+ weeks | Enterprise |
Ranges are for standard to good specification Cat B work in London. Add 4 to 12 weeks for design, consents and procurement before work starts. Furniture, IT and AV are usually priced separately. Full cost guide.
Cat B fit out typically runs £50 to £150 per sq ft for standard specifications, rising to £200 or more for premium finishes. Cat A is usually £100 to £150 per sq ft. Full design and build at a mid range spec generally lands between £80 and £120 per sq ft.
Under 3,000 sq ft: 4 to 8 weeks on site. 3,000 to 10,000 sq ft: 8 to 16 weeks. Over 10,000 sq ft: 16 to 30 weeks or more. Add 4 to 12 weeks before construction for design, consents and procurement.
Design and build is faster and gives one point of accountability, which suits most occupier projects under 30,000 sq ft. An independent architect and tendered contractor gives more design ambition and price competition, and suits landlord work, listed buildings and larger headquarters.