Trusted by Leading Businesses
Office Fit Out Specialists in London: Cat A, Cat B & Refurbishment
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Office Design & PlanningWe design workspaces that improve how people work, not just how they look. Every layout we plan is focused on better workflow, higher productivity, and smarter space use, so your office operates efficiently and feels comfortable for your team.
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CAT A & B Fit-OutFrom Cat A infrastructure to Cat B finishes, we cover every level of your office fit out. Our team delivers everything, including ceilings, lighting, flooring, and furniture – with precision and speed. The result: a ready-to-move-in workspace that meets regulations, performs reliably, and fits your budget.
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Commercial RefurbishmentGetting tired of an outdated office is common, so we refresh and rebuild old spaces into modern, welcoming workplaces. As trusted office refurbishment contractors in London, we turn dull setups into vibrant spaces. -
Smart Space OptimizationDo you expect something more from your office space? Don’t worry, we are here to exceed your expectations with our smart storage, racking, and mezzanine solutions, keeping your workplace organised always.
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Fire Strategy & ComplianceSafety is something that cannot be overlooked. Each office fit out meets strict building and fire safety standards. This is what gives our clients peace of mind from day one and confidence that their workspace is built to last. -
Sustainability & Energy EfficiencyCraftex is a firm believer that good design shouldn’t cost the earth. That is why we focus on energy efficiency and sustainable materials. This makes your office greener and your bills lighter.
How Craftex Delivers Your Fit Out
Free Office Fit-Out Guide & Checklist
Plan your London office design with ease. Get a simple checklist covering budget, timelines, design, and compliance—helping you avoid mistakes and stay on track
Case studies
- Portsoken House Reception I Aldgate London
- Beaumont House I West Kensington, London
- Medusa - Beauchamp Place I Knightsbridge, London
- Banbury Warehouse I Oxfordshire
Why 150+ Businesses Chose Craftex and Keep Coming Back?
Fixed Price + Delay Penalties
Faster Turnarounds Than Competitors
Built-In Reliability: Processes, Guarantees, Proof
Snag-Free Handover — Backed by Clients
Zero Downtime Fit-Outs
Design & Build Under One Roof
Fixed Price + Delay Penalties
Faster Turnarounds Than Competitors
Built-In Reliability: Processes, Guarantees, Proof
Snag-Free Handover — Backed by Clients
Zero Downtime Fit-Outs
Design & Build Under One Roof
Whether you’re upgrading, expanding, or starting fresh, our fit-out specialists bring your vision to life.
At Craftex, we believe a successful workspace starts with the right foundation. As an experienced Cat A fit-out contractor in London, we create high-quality, functional spaces that give you complete flexibility for the future.
When it comes to tailoring a space to your business, our team specializes in Cat A, Cat B office fit-outs in London, transforming empty shells into work environments that reflect your brand, culture, and people. If you’re upgrading an existing space, our Cat A, Cat B office refurbishment service ensures your workplace feels modern, efficient, and built for productivity. We also support clients looking for a full office fit out London when planning new layouts or improving current ones.
From planning through to completion, Craftex takes care of every stage with precision and care. With transparent communication and a commitment to finishing on time and within budget, we make the process stress-free. Whether you need a Cat A, Cat B fit-out contractor for a new construction or full refurbishment services, we are just one call away!
Office fit-out in London: what to plan before work starts
Most London offices are leased floors in multi-let buildings, so an office fit-out here is shaped as much by the lease and the building as by the design. Planning the points below early is what keeps a fit-out on programme and on budget. As a design & build contractor, Craftex handles design and construction under one roof, with one point of contact from first survey to handover.
1. Landlord consent and the building's rules
In most leased London buildings you need the landlord's written consent before any works start, usually a Licence for Alterations. Landlords and managing agents typically ask for drawings, a specification, method statements and risk assessments, and many buildings have their own fit-out guide covering permitted working hours, noisy works, goods-lift and loading-bay bookings, and how services can be connected to the base build. Factor this approval period into your move-in date.
2. Cat A or Cat B – know what you are taking on
A Cat A space gives you the basic infrastructure (raised floors, suspended ceilings, lighting, base mechanical and electrical services and finishes). Cat B is everything that makes it your office: meeting rooms, kitchens and breakout areas, power and data to desks, branding, furniture and the layout itself. Many projects combine both. Read our guide to Cat A vs Cat A+ vs Cat B and the overview of types of office fit-out.
3. Compliance: Building Regulations, fire strategy and CDM
Office fit-outs usually need Building Regulations approval through building control, and new partitions, doors and ceilings have to work with the building's fire strategy (escape routes, compartmentation, detection and alarm coverage). Projects also fall under the CDM 2015 regulations, which set out who is responsible for health and safety during design and construction. Every Craftex office fit-out is designed and built to meet building and fire safety standards, and we are an independently certified contractor (ISO and CHAS).
4. Keeping your business running
Many London fit-outs happen in occupied buildings or around a business that cannot close. We plan works around your operations with night shifts, weekend working and phased programmes, so noisy and disruptive activities do not stop your team or your neighbours. At Portsoken House in Aldgate we delivered a 1,550 sq m, £2.2M warehouse-to-office conversion with full M&E around occupied tenants.
5. Budget and programme
Cost depends on size, specification, M&E scope and the condition of the space. Our office fit-out cost guide explains what drives the price per square foot. We work on lump-sum contracts with a clear scope, and around 70% of our labour is in-house, which gives tighter control of quality and programme. For scale: the 750 sq m open-plan refurbishment at Beaumont House, Kensington (£350K) took 3 weeks, while the Portsoken House conversion ran for 7 months.
Office fit-out London – frequently asked questions
How long does an office fit-out in London take?
It depends on floor area and scope. On our recent London projects, a 750 sq m office refurbishment at Beaumont House took 3 weeks on site, a 70 sq m high-specification reception at Portsoken House took 12 weeks, and a 1,550 sq m warehouse-to-office conversion took 7 months. Allow time before site works for survey, design and landlord approval.
Do I need landlord approval for an office fit-out?
In most leased buildings, yes. The landlord will usually grant a Licence for Alterations once they have reviewed your drawings and specification, and the building's fit-out rules will set working hours and access arrangements. Our design & build service includes preparing this design information.
Do you deliver both Cat A and Cat B fit-outs?
Yes. We cover everything from Cat A infrastructure to Cat B finishes, including ceilings, lighting, flooring, M&E, joinery and furniture, as a single design & build package.
Can you fit out our office while we keep working?
Yes. We build around your operations with night shifts, weekend working and phased programmes to avoid shutdowns and lost revenue.
How do you price an office fit-out?
After a site visit and brief we give a lump-sum price against a clear scope, so your spend is predictable and easier to sign off. If you already have a like-for-like quote, send it to us and we will review it.
What size of office projects do you take on?
Our recent London workspace projects range from a £200K railway-arch conversion to a £2.2M office conversion in Aldgate. See all our case studies.
Planning an office fit-out in London?
Tell us about your space, timing and budget. We will visit, review the building's requirements and give you a clear design & build proposal.
Get a free consultation Commercial fit-out servicesOffice fit-out across London: the areas we work in
Every part of London brings different buildings, landlords and rules, and these shape the programme and cost of an office fit-out before any design is drawn. We run projects across central and west London from our office on Buckingham Palace Road. Below is what usually matters in each area, with links to our local pages and the Craftex projects nearby.
Mayfair (W1)
Headquarters offices in Georgian townhouses and period buildings. Most are listed or in a conservation area, and many freeholds sit with estate landlords, so we plan for listed building consent and estate approvals before work starts.
Office fit-out in Mayfair →Westminster & Victoria (SW1)
Larger office floors around Victoria Street alongside period buildings in conservation areas. We work to landlord fit-out guides and schedule noisy work out of hours when the building is occupied.
Office fit-out in Westminster →Office fit-out in Victoria →
Kensington (W8)
Office refurbishments in converted period buildings with tight access. At Beaumont House we delivered an open-plan office with meeting rooms: £350K, 750 sq m.
Office fit-out in Kensington →Beaumont House case study →
Marylebone (W1)
Period office buildings and mansion blocks, much of it held by large estate landlords. A landlord's licence for alterations and estate sign-off usually set the start date, so we prepare the drawings and method statements they ask for.
Office fit-out in Marylebone →Canary Wharf (E14)
Grade A towers handed over at Cat A, so most projects are Cat B fit-outs. Estate rules on access, deliveries and working hours are strict, and we build the programme around booked loading bays and out-of-hours work.
Office fit-out in Canary Wharf →Knightsbridge & Belgravia (SW1/SW3)
Boutique offices, clinics and showrooms in townhouses on estate-owned streets. Expect estate consent, conservation-area rules and close attention to neighbours.
Fit-out in Knightsbridge →Fit-out in Belgravia →
City fringe & Aldgate (E1/EC3)
Warehouse and older commercial buildings converted into modern offices. Portsoken House in Aldgate was a full warehouse-to-office conversion with full M&E: £2.2M, 1,550 sq m, 7 months.
Portsoken House case study →Islington (N1)
Loft and warehouse-style offices for creative and professional firms, often with exposed services and older structures that need surveying before the layout is fixed.
Office fit-out in Islington →Hammersmith, Chiswick & Battersea
Modern office buildings and newer developments in west and south-west London, where most work is Cat B fit-out or refurbishment of existing floors.
Hammersmith →Chiswick →
Battersea →
Frequently Asked Questions