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EC1 to EC4

Office fit out and refurbishment companies in the City of London

The Square Mile is the densest office market in Europe and the most regulated to work in. Expect landlord managed buildings with strict delivery hours, out of hours noise rules, and licences to alter that run through institutional asset managers. Much of the stock is 1980s to 2000s floorplates of 10,000 to 30,000 sq ft being refurbished to meet EPC rules, so Cat A and landlord led refurbishment work is as common as tenant fit out. Listed buildings and the City's conservation areas add planning time on anything touching a facade.

Head office in the borough

3 firms based in City of London

Resolved from the registered or trading address on each profile. Being based here does not mean a firm only works here; every firm in the directory covers London.

Mid Market
AI
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AIS Interiors

Est. 1979

Global delivery capability for multinational clients. 45+ years experience.

Design and build, mid market band, trading since 1979.

Projects
5k to 30k sq ft
Client size
80 to 400 staff
Budget
£1m to £10m
Design and BuildOffice Fit OutsGlobal Delivery
Public data, March 2026Profile
Enterprise
MI
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Mace Interiors

Est. 1990

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.

Projects
30k+ sq ft
Client size
250+ staff
Budget
£5m and above
Commercial Fit OutInterior DesignProject Management+2
Public data, March 2026Profile
Mid Market
ZW
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Zentura Workspace

Est. 2008

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.

Projects
5k to 30k sq ft
Client size
40 to 250 staff
Budget
£300k to £5m
D&BRefurbishmentFit Out+5
Public data, March 2026Profile
Working in City of London

Firms that take on City projects

Ordered with enterprise and mid market firms first, because central London projects skew larger. The six below are a starting point.

Every firm in the directory covers the whole capital. For all 66, see the full list of London office refurbishment companies.

Typical stock in City of London: Large floorplates, institutional landlords, heavy Cat A activity.

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