Office Fit-Out Isleworth
Office fit-outs for small and medium office suites in Isleworth, partitions, ceilings, lighting and small power for your office, with the IT and specialist trades coordinated.
- Rated 4.9 from 31 reviews on MyBuilder
- UK guide: £70 to £120 per sq ft
- Free site survey, itemised quote
The office fit-outs we take on in Isleworth are small, and it is honest to say so. Hounslow's Local Plan names Isleworth and Old Isleworth among its large neighbourhood centres, and the office space around them is mostly offices above shops, small suites, studios and professional rooms. We strip out, build partitions and ceilings, renew lighting and power, fit the tea point and WC, and hand the space back ready for your IT supplier and furniture.
For Isleworth, the construction part of an office fit-out is published at £70 to £120 per sq ft as a UK guide, and an all-in London office fit-out at £148 to £359 per sq ft (Oktra and Cushman and Wakefield, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Isleworth: we build the office partitions, ceilings, lighting and finishes as one contract and coordinate the IT supplier and specialist trades around them.
Price guide
| Work | Indicative range |
|---|---|
| Office fit-out, construction only | £70 to £120 per sq ft |
| London office fit-out, all-in | £148 to £359 per sq ft |
| Metal stud partition, boarded both sides | £55 to £65 per m² |
| Suspended ceiling, grid and tile | £22 to £35 per m² |
| Dilapidations at lease end | £15 to £20 per sq ft |
Indicative ranges from published cost guides (Cushman and Wakefield, Oktra and Checkatrade, 2026), not a quotation. Most are UK-wide figures and London work usually costs more; a row marked London is a London figure. Prices checked September 2026.
Quick estimate from UK guide figures
Guide range: choose above
Small office space around Isleworth's two neighbourhood centres
The office work we see in Isleworth is small. Hounslow's Local Plan names Isleworth and Old Isleworth among its seven large neighbourhood centres, and the working space in them is mostly upper floors over shops, a few converted houses in professional use, and small ground floor suites. It suits an accountant, a lettings office, a therapy practice or a design studio taking one or two floors of a few hundred square feet.
That scale changes the job. An upper floor office in an Isleworth centre is reached by a narrow stair shared with, or next to, the shop below, so materials go up by hand and the escape route is the same stair. Ceiling voids are shallow, and cabling often runs in trunking rather than under a raised floor. We survey the stair, the supply and the existing fire separation before quoting, because those three set the budget.
Cat A and Cat B in a small Isleworth office
Cat A and Cat B are landlord and tenant terms. Cat A is the base a landlord hands over: finished ceilings, basic lighting, heating, power to the perimeter and working WCs. Cat B is the tenant's own layout on top of it: meeting rooms, glazed screens, a tea point, extra sockets and data points, signage and decoration. In a small TW7 office the line between them is often blurred, so your lease or heads of terms decide who pays for what.
The Cat B sequence is fixed: strip out, partitions and glazed screens, first fix electrics and data containment, ceilings and lighting, second fix, floor finishes and decoration. Your IT supplier pulls the data cabling through the containment we leave, and connects the equipment at the end, once the ceilings are closed and the dust has gone. Where an Isleworth office sits over a trading shop, we keep dusty work behind sealed screens and agree delivery times with the shop.
Building regulations and CDM for Isleworth office work
Office work in Isleworth is non-domestic building work, and it goes through building control. Hounslow's Table F charges alterations, fit-outs and installations not described in its other tables according to the estimated cost of works, so the application needs an honest cost figure. An office is covered by the fire safety order, so a building notice is not available and the route is full plans, which Hounslow's guidance lists for alterations and changes of use.
The checks in a small office are means of escape and fire separation from the shop or flat next door (Part B), level access and an accessible WC where the layout allows (Part M), and lighting and heating efficiency (Part L). As a commercial client you have your own duties under the CDM Regulations: allow enough time, share what you know about the building, and where more than one contractor is involved, appoint a principal designer and a principal contractor in writing. We plan the inspections into the programme.
Office to home rules around Isleworth's centres, as context
Office space in Isleworth's centres cannot switch to flats under permitted development. Class MA of the national permitted development order allows a change from Class E, which includes offices, to homes. Hounslow's confirmed Article 4 direction removes that right in town centres, large and small neighbourhood centres, strategic and locally significant industrial sites and key existing office locations, and it came into force on 22 April 2025. A unit in either Isleworth centre therefore needs full planning permission to become a home.
For you as an office tenant, that is context rather than a hurdle. The office floors in the two Isleworth centres cannot quietly become flats, so a fit-out there can be planned as a long term asset rather than a stopgap before redevelopment. Specify a distribution board with spare ways, containment with room to grow and partitions that can be moved, and the next layout change is quicker and cheaper to make.
- Reception areas and internal joinery
- Suspended grid ceilings and plasterboard ceilings with access panels
- Strip-out of the previous tenant's office, with disposal
VOA Council Tax stock of properties, March 2025, for Isleworth & Ivybridge, Syon Green and Spring Grove. Counts rounded by the VOA.
The GS Renovation Difference in Isleworth
A small office fit-out lives or dies on the programme and on the neighbours, because the space is usually above a trading shop or beside a flat. We agree the landlord's conditions, the building control route and the working hours before starting, then run the trades back to back so the office can open on the agreed date. The new lighting and power circuits are certified by a registered electrician. Your IT supplier works to the containment we leave, and you get one point of contact.
- Honest updates if a date or a detail has to move
- Office strip-out and core drilling booked outside other tenants' working hours
- Full plans building control coordinated for the new office layout from the outset
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FAQ
Frequently Asked Questions about Office Fit-Out Isleworth
What should a business budget for an office fit-out in Isleworth?
Treat the UK guide of £70 to £120 per square foot for the construction work (Oktra, 2026) as a floor; London all-in figures run £148 to £359 per square foot (Cushman and Wakefield, 2026). Add the landlord's fees for the licence for alterations, any dilapidations at lease end, and your IT and furniture, which sit outside the building work. A Isleworth quote follows a survey of the space.
Do you fit out small offices in Isleworth, or only large floors?
Small offices are the work here. The office space in Isleworth is mostly upper floors and small suites in the two large neighbourhood centres the Local Plan names, Isleworth and Old Isleworth. A fit-out of one or two rooms with a tea point and WC is a normal job for us, and it follows the same sequence as a larger one.
What is the difference between a Cat A and a Cat B office fit-out?
Cat A is the landlord's base: ceilings, lighting, heating, perimeter power and WCs. Cat B is the occupier's layout on top: rooms, glass screens, the kitchenette, extra power and data, finishes and signs. Some landlords let space as a shell below Cat A, so check the heads of terms to see what is already included before budgeting.
Can an Isleworth office fit-out run at night or at weekends?
Quiet work can. Noisy building work in Hounslow is limited to Monday to Friday 8am to 6pm and Saturday 8am to 1pm. Where an occupied building needs the noisy work done at other times, Hounslow can grant Section 61 consent for specific hours under agreed conditions. The application goes in with the programme and method statement.
How is building control charged for an office fit-out in Isleworth?
By the estimated cost of the works. Hounslow's Table F covers alterations, fit-outs and installations not described in its other tables and sets the charge from that estimate, for a full plans or building notice application. For an office the fire safety order applies, so full plans is the route in practice. Give an honest estimate, because the charge band follows it.
Does the landlord need to approve an office fit-out in Isleworth?
Almost always. A commercial lease normally requires the landlord's licence for alterations before partitions, services or ceilings change, and the landlord may ask for drawings, a method statement and the building control approval. Request the licence while the plans are being checked, so neither holds up the start. Your designer supplies the drawings, and we supply the method statement and programme.
What happens to an office fit-out at the end of the lease?
The lease decides. Many leases require the tenant to remove its alterations and reinstate the space to its original condition, and the landlord's surveyor then serves a schedule of dilapidations. Keep the licence for alterations and the as built drawings, because they show what was there before. We can strip out and reinstate to that schedule when the lease ends.
Can an Isleworth office above a shop be turned into a flat without planning?
No, in the designated centres. Hounslow's confirmed Article 4 direction removes the Class MA right to change Class E use, which covers offices, to homes in town centres and neighbourhood centres, and it came into force on 22 April 2025. A change there needs a full planning application, made by the owner or their designer.
What fire safety work does a small Isleworth office need?
Above a shop that usually means a protected stair, fire doors onto it, fire separation from the shop below and emergency lighting. The responsible person for the premises carries out a fire risk assessment under the fire safety order, and building control checks the escape design. Hounslow issues a completion certificate once the work is completed and inspected, and your landlord will ask for it.
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