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Office fit-out cost calculator
Get an instant UK estimate for your Cat B fit-out
Planning a new office and need a realistic budget figure – before you commit?
Our office fit-out cost calculator gives you an instant, data-informed estimate for your project using current 2026 pricing. Adjust the size, quality level, location and complexity, and see how your budget shifts in real time. It’s completely free to use and requires no sign-up.
Understand your starting point
What does an office fit-out cost in the UK?
Office fit-out costs in the UK typically range from around £80 to £180+ per sq ft.
Where your project lands depends on:
- Location – London and the South East carry a premium
- Whether you’re delivering CAT A, CAT A+ or CAT B (not sure of the difference? Check out our useful guide)
- The condition of the existing CAT A
- Quality level – economy, medium or high spec
- Furniture and AV requirements
- Sustainability targets
- Sector needs – legal and financial environments often require higher acoustic and security performance
Most online guides give you a broad benchmark. Boards and finance teams usually want something more tailored.
That’s where our calculator helps.
A smarter way to sense-check your budget
How our office fit-out cost calculator works
In under two minutes, you can:
- Enter your floor area
- Adjust your headcount
- Select your UK region
- Choose a quality level
- Factor in complexities like listed buildings, access difficulties or substandard CAT A
- Add sustainability elements such as SKA certification
- Include furniture, styling and client-side professional fees
You’ll receive:
- A total estimated project cost range
- A £ per sq ft benchmark
- A midpoint estimate for board-level planning
- A clear cost breakdown – fit-out, furniture and contingency
- A practical next-steps checklist
The calculator draws on leading UK cost guides and real project benchmarks from our work across London and major UK cities.
Feeling unsure about some of the inputs?
Not sure where to start?
If you’re hesitating over things like quality level, CAT A condition or whether your building counts as “high complexity”, that’s completely normal.
At early stage, most businesses are still figuring out:
- How much space they truly need
- What hybrid working really means for layout
- How sustainability targets affect cost
- What “medium spec” actually looks like in reality
If you’re still working out how much space your team actually needs, our Office Right-Sizing Tool can help. It’s designed to sense-check headcount, hybrid patterns and utilisation before you even start costing.
If you’d prefer more context first, our Ultimate Office Fit-Out Guide covers early-stage planning, budgeting and delivery in detail.
Built for decision makers
Who is the office fit-out cost calculator for?
The calculator is designed for organisations making significant property decisions – whether that’s a relocation, refurbishment or first office for a scaling brand.
- A CEO testing affordability before committing to a lease
- A CFO building a capital expenditure plan
- A Head of Workplace or Facilities comparing buildings
- A professional services firm with cellular, acoustic or compliance requirements
- A growing tech business modelling different growth scenarios
- Approaching lease expiry and weighing up stay vs move
We work with ambitious businesses all over the UK, helping organisations design to a defined cost envelope – balancing brand, performance, sustainability and long-term flexibility.
Plan your office fit-out with confidence.
Use the office fit-out cost calculator to generate your estimate in minutes.
No cost, no sign-up – just useful data.
Or talk to one of our experts.
Office Fit-Out Cost Calculator FAQs
How much does an office fit-out cost per square metre in the UK?
Office fit-out costs in the UK typically range from around £80 to £200+ per sq ft. The final figure depends on sq ft, location, specification level, existing CAT A condition, furniture requirements and sustainability targets. Our calculator provides a tailored estimate based on your project inputs.
How much does an office fit-out cost in London?
London fit-out costs are typically higher than regional UK averages due to labour, logistics and building constraints. Projects in central London can exceed £200 per sq ft for high-spec environments. The calculator includes regional uplifts to reflect this.
What’s the difference between CAT A and CAT B fit-out costs?
CAT A refers to the base building delivered by the landlord, usually including raised floors, ceilings, lighting and basic services.
CAT B is the tenant’s fit-out – meeting rooms, kitchens, furniture, branding and finishes.
Learn more about the difference between Cat A and Cat B here.
If the existing CAT A is poor quality or incomplete, your CAT B costs may increase. Understanding the starting point is critical to accurate budgeting.
Does the calculator include furniture and professional fees?
Yes. You can include furniture, styling and client-side professional fees in your estimate. The output provides a breakdown so you can see how each element contributes to total project cost.
Is this office fit-out cost calculator accurate?
The calculator is designed to provide an informed early-stage budget range based on UK market data and typical project variables. It is not a formal quote. Final costs depend on detailed design development, building surveys and procurement strategy.
Can you help compare buildings before we sign a lease?
Yes. Fit-out cost is often the hidden variable when comparing lease options. We regularly help organisations model different scenarios so they understand the full capital commitment before signing heads of terms.
How long does an office fit-out take?
Programme length depends on project size and complexity. As a rough guide, a mid-sized CAT B fit-out can take between 8 and 16 weeks from site start, excluding design and approvals. Early planning helps avoid delays.
What sort of businesses is the office fit-out calculator for?
We regularly deliver office fit-outs for law firms, accountancy practices, tech firms, creative agencies and other professional services organisations across the UK.
Many of our clients require higher levels of acoustic performance, security, hybrid working flexibility and brand expression. Our calculator reflects some of those variables, particularly for financial and legal environments.
If your sector has specific compliance or operational requirements, we can help you model those early in the budgeting process.
Where in the UK do you deliver office fit-outs?
We deliver office fit-outs across London and the wider UK, including major cities such as Bristol, Birmingham, Manchester and Leeds.
Location significantly affects cost due to labour rates, logistics and building constraints. The office fit-out cost calculator includes regional uplifts to reflect these differences.
If you’re planning a project elsewhere in the UK, we’re happy to advise on likely cost implications.