Office Fit Out Costs Per Sq Ft UK: 2026 Pricing Guide

Important Note on Pricing: The £60 to £120 per sq ft baseline figures quoted in this guide primarily cover core construction and M&E installation. To calculate your true “all-in” total, you must add £12 to £35 per sq ft for commercial furniture, and £8 to £15 per sq ft for technology and AV integration. A basic all-in London fit out typically starts closer to £90 per sq ft.

This guide was produced by the commercial fit out specialists at Buon Construction, drawing on 2026 project data across London and the UK.

What Is the Average Office Fit Out Cost Per Sq Ft in the UK (2026)?

Based on recent data and surveys, the typical office fit out cost per sq ft in 2026 sits between £40 and £125+. Most projects land in the £60 to £120 range when construction, furniture, and basic technology are included.

The £40 per sq ft figure applies to a minimal shell-and-core Cat A finish with no customisation. The £125+ figure applies to fully bespoke, high-spec Cat B environments with premium joinery, smart building systems, and high-end furniture. London projects regularly push well beyond that ceiling.

These numbers reflect only construction and installation costs. As you will read further down, there are several additional costs that most budget guides ignore entirely, including legal fees, professional fees, and end-of-lease dilapidation charges. Factoring those in can add £15 to £30+ per sq ft to your build cost.

Office Fit Out Cost Per Sq Ft by Specification Level (UK 2026)

Geographic Context: The £40 to £75 basic range shown above is achievable in regional markets (e.g., Manchester, Liverpool) for simple, open-plan layouts. However, for a London-based project, higher labour rates and complex logistics mean a basic all-in fit out realistically starts from £90 per sq ft.

Cat A vs Cat B Fit Out: What Is the Difference and Who Pays?

This is the question that causes the most confusion for tenants signing a commercial lease for the first time. Understanding the difference protects you from unexpected bills.

Shell and Core (Shell & Void): The Raw Starting Point 

Before a space even reaches Cat A standard, it exists as ‘Shell and Core’. This is a bare concrete box with exposed blockwork, no raised floors, and no lighting. Fitting out from a Shell and Core state requires the most work and typically costs £50 to £100+ per sq ft just to bring the building up to a habitable baseline before your bespoke design even begins.

Category A (Cat A): The Landlord’s Job

A Cat A fit out is what a landlord does to make a commercial building habitable and ready for tenants. Think of it as a clean, neutral starting point. The space has suspended ceilings, raised access flooring, integrated LED lighting, functional HVAC, and power distribution, but nothing else. There are no desks, no meeting rooms, no branding, and no partitions.

Some landlords go further and offer a Cat A+ or plug-and-play fit out. This includes basic furniture, shared meeting rooms, and faster internet infrastructure, making it suitable for smaller teams who want to move in quickly without a major capital spend upfront.

Cat A Cost Ranges UK 2026

Category B (Cat B): The Tenant’s Responsibility

A Cat B fit out is everything you add on top of the Cat A base to turn that empty shell into your actual office. This is entirely the tenant’s cost and covers bespoke partitioning, meeting rooms, a branded reception, IT infrastructure, furniture, kitchen fit out, acoustic panels, decorative lighting, and all soft furnishings.

This is where most of your spending occurs. Most commercial leases require you to fund the Cat B fit out yourself, and this is what most office fit out companies are referring to when they quote you a price.

Cat B Cost Ranges UK 2026

Where Does Your Office Fit Out Budget Actually Go? A Component-Level Breakdown

One of the biggest frustrations tenants face is receiving a lump-sum quote with no visibility into what is driving the price. Here is a clear, line-by-line breakdown of where your per sq ft budget is spent across three specification levels.

Fit Out Cost Per Component 2026 UK

The core construction and M&E phases consume 60 to 70 per cent of your total build cost. Furniture and equipment typically take up another 15 to 20 per cent. Technology infrastructure adds a further £8 to £15 per sq ft, depending on your AV integration and data cabling requirements.

What About HVAC and M&E Costs?

Mechanical, electrical, and plumbing (MEP) work is often the most expensive and most variable line item in any commercial fit out. In a modern open-plan office, HVAC commissioning alone can add £15 to £25 per sq ft if the existing plant needs upgrading. If the building is older and the ductwork needs to be completely redesigned for your specific layout, that figure rises further. Always get a mechanical engineer to assess the existing plant before you sign your lease.

Office Fit Out Costs by UK City: Regional Pricing Index (2026)

Where you are based in the UK has a huge impact on what you pay. According to the recent surveys, London is now the most expensive city in the world for high-specification commercial fit outs, with average high-spec costs reaching £4,671 per square metre. That puts it ahead of New York, Zurich, and San Francisco.

The reasons are specific: acute shortages of specialist trades (particularly Chartered Fire Engineers), increasingly complex building safety regulations, and intense corporate competition for Grade A sustainable space in the City of London and Canary Wharf.

UK Office Fit Out Costs by City (2026)

Manchester consistently offers cost savings of 20 to 25 per cent against equivalent London projects. Birmingham sits in the middle, making it a strong choice for national headquarters seeking a balance between talent accessibility and value. Glasgow remains the most cost-competitive major city in the UK.

Real-World Examples: How Much Does an Office Fit Out Cost?

For a 5,000 sq ft office designed to a standard mid-level commercial specification, you should budget between £400,000 and £600,000 in total. That covers construction, furniture, technology, and professional fees. At a high specification, the same space in London could cost £1 million or more.

Budgeting by Headcount

Many founders think in terms of team size rather than square footage. As a rule of thumb, a basic all-in fit out costs approximately £500 to £600 per person. For a mid-spec finish with highly durable, ergonomic furniture, expect to budget £800 to £900 per person.

A Real-World Scenario: Imagine a company with 20 staff moving into a 2,000 sq ft regional office that currently has a modern Cat A finish. They want a mid-range, all-in fit out (including construction, new desks, and meeting room AV). Their baseline project cost will be approximately £180,000.

Total Office Fit Out Cost by Size Uk 2026

Indicative UK totals based on mid-range spec. Does not include Licence to Alter legal fees, dilapidations provision, or contingency. London projects sit at the higher end or above these ranges.

The Hidden Financial Icebergs: Legal Fees, Licences, and Exit Costs

This is where most office fit out cost guides let you down. They show you a clean table of construction costs and leave you to discover the rest the hard way. The reality is that significant expenses exist both before your contractor arrives on site and after you hand the keys back.

The Licence to Alter: A Mandatory Cost Tenants Routinely Underestimate

Here is the bit no one tells you: Before you even swing a hammer, you have to pay your landlord for the privilege of improving their building.

Before any works begin, your landlord must formally grant a Licence to Alter (LTA) under Section 19(2) of the Landlord and Tenant Act 1927 (https://www.legislation.gov.uk/ukpga/Geo5/17-18/36). 

Cost Trap: Never start construction without an executed LTA. Your landlord is legally entitled to force you to rip out unauthorised work at your own expense. Expect to pay £3,000 to £8,000 just to cover the landlord’s legal and surveyor review fees for a standard fit-out, and over £10,000 for complex structural works.

The part that catches tenants off guard is this: you, the tenant, are legally required to pay the landlord’s legal and surveyor fees incurred during the review and approval process.

Licence to Alter Costs (UK 2026)

Dilapidations: The Devastating End-of-Lease Bill

This is the ultimate hidden cost. Companies gleefully spend hundreds of thousands of pounds building beautiful bespoke spaces, only to be blindsided years later by a massive dilapidations bill to violently tear it all down. You are legally obligated to return the property to its original condition when you leave, and landlords will enforce this aggressively.

The Royal Institution of Chartered Surveyors (https://www.rics.org/profession-standards/rics-standards-and-guidance/sector-standards/building-surveying-standards/dilapidations-in-england-and-wales) publishes a baseline estimate of around £7.27 per sq ft for dilapidations. However, recent commercial data shows that actual settled costs for modern, heavily customised offices typically run between £15 and £25 per sq ft.

Pro Insight: You can actively design your way out of this trap. By specifying modular, demountable partitioning systems during your Cat B fit out, you avoid structural damage and can drastically slash your end-of-lease reinstatement costs.

Dilapidations Estimates by Office Size (2026 UK)

Based on the RICS baseline figure and recent commercial surveyor settlement data. Actual costs depend heavily on the level of cellularisation and lease terms.

There are two practical ways to reduce your dilapidations exposure. First, negotiate a dilapidations cap at the start of your lease. Second, use modular, demountable partitioning systems during your Cat B fit out. These systems can be removed without structural damage, dramatically cutting the cost of reinstatement at the end of the lease.

Real-World Case Study: Integrating lifecycle thinking saves cash. In a recent 5,000 sq ft London project, the team at Buon Construction reduced the client’s future dilapidation liabilities by 40% simply by avoiding fixed plasterboard and using high-acoustic demountable glass partitions. It is about protecting your exit strategy from day one.

Professional Fees: The 10 to 15 Per Cent You Cannot Afford to Skip

Architectural design, structural engineering, M&E consultancy, CDM coordination, and project management are not optional extras. These fees typically add 10 to 15 per cent on top of your base construction cost. Skipping them is one of the costliest mistakes tenants make. The consequences include Building Control failures, structural errors, and CDM health and safety violations that can halt your project entirely.

Small Office Fit Out Costs: What SMEs and Startups Need to Know (Under 3,000 Sq Ft)

Most office fit out cost guides are built around 10,000 sq ft corporate floorplates. If you are fitting out a space under 3,000 sq ft, specific dynamics will affect your per sq ft cost.

Why Smaller Offices Cost More Per Square Foot

The economies of scale problem is real. A commercial fit out has irreducible fixed costs that stay the same regardless of the size of the space: site setup, scaffolding, HVAC commissioning, waste removal, and project management preliminaries. When you spread those fixed costs over a tiny floorplate, the cost per sq ft rises sharply.

A realistic all-in cost for a small London office (1,500 to 2,500 sq ft) at a mid-range specification starts at around £90 to £110 per sq ft, compared to £75 to £95 for a comparable specification in a 10,000 sq ft space. This is not a contractor markup. It is basic arithmetic.

How to Prioritise a Limited Fit Out Budget

Spend on This:

• High-capacity data cabling and network infrastructure (the backbone of your office)
• Acoustic treatment and sound management (open-plan noise is the number one SME complaint)
• Ergonomic task chairs and sit-stand desks (directly impact productivity and retention)
• Quality lighting with dimming controls
• Modular partitioning that can be removed cleanly at least one end

Save On This:

• Bespoke reception joinery if your clients rarely visit
• Fixed, heavy partitions if your headcount is likely to change
• Consumer-grade furniture from high-street retailers: While hacking together IKEA units or seeking out cheap Wickes cabinetry might seem highly tempting for a tight startup budget, it is a risk. Consumer-grade furniture lacks the warranty, structural integrity, and durability required for rigorous 40-hour commercial use. Relying on it inevitably creates a false economy when it requires total replacement within 18 months
• Over-specified AV technology for a team of under 15 people
• Feature walls and decorative finishes in non-client-facing areas

2026 Market Trends: Contractor Risk, Supply Chain Volatility, and Sustainability ROI

The UK commercial fit out market in 2026 is not a stable environment. Several forces are actively pushing costs upward and changing how projects should be procured.

The ISG Collapse and Its Ripple Effects

The collapse of major contractor ISG into administration sent shockwaves through the UK fit out supply chain. Subcontractors who were owed money are now in financial difficulty, and main contractors are operating with elevated caution. The direct consequence for tenants is that fixed-price, lump-sum contracts are becoming harder to secure. Contractors are attaching larger risk premiums to fixed bids to protect themselves.

Survey data shows that 55 per cent of contractors expect supply prices to increase in the near term, and 67 per cent anticipate rising labour costs. Material inflation has moderated since its 2022 peak of 25.2 per cent, but raw material prices have not returned to pre-pandemic levels.

Stage 2 Procurement: The Smarter Way to Buy a Fit Out in a Volatile Market

Stage 2 procurement means engaging your contractor much earlier in the design process, before full architectural drawings are complete. By bringing your contractor in during the design phase, you allow them to provide real-time cost input, commit to supply chain pricing early, and flag any buildability issues before they become expensive problems on site.

In the current market, this approach can save 10 to 15 per cent on the overall project cost compared to a traditional single-stage tender. It also dramatically reduces the risk of mid-project cost surprises.

Sustainability as a Financial Return, Not a Box-Ticking Exercise

Premium London developments, including 8 Bishopsgate and 1 Broadgate, are achieving record rents precisely because of their sustainability credentials. Corporate tenants are increasingly demanding deeply sustainable fit outs to meet their own ESG reporting obligations.

Installing energy-efficient HVAC systems and DALI daylight dimming lighting adds approximately 5 to 10 per cent to your upfront fit out cost. However, the operational savings typically deliver a full return on that investment within 3 to 5 years. 

Over a standard 10-year lease, the cumulative utility savings are substantial. Furthermore, with updated regulations such as the Energy Performance of Buildings Directive (EPBD), which sets strict targets to cut building emissions by 55 per cent compared to 2022, investing in energy-efficient systems upfront ensures your workspace remains legally compliant and future-proofed against upcoming environmental legislation.

There is also an emerging trend: rather than stripping out and replacing perfectly functional furniture left by a previous tenant, forward-thinking occupiers are retaining and reusing it. Companies working with design-and-build specialists such as Buon Construction are incorporating this kind of circular design thinking into the initial brief, cutting both upfront costs and future dilapidation liability.

Pros of a Bespoke Office Fit Out

• Full control over brand, layout, and culture
• Lower monthly cost per desk over a 5+ year lease
• Space designed precisely for your workflow
• Ability to create a talent-attracting environment
• Capital investment appears on the balance sheet as an asset
• Freedom to install specialist infrastructure (labs, studios, server rooms)

Cons of a Bespoke Fit Out

• Large upfront capital cost
• Dilapidations liability at the end of the lease
• Licence to Alter legal fees before works begin
• Risk of cost overruns in a volatile supply chain
• Takes 8 to 16 weeks to complete (no immediate occupancy)
• Locked into a fixed layout that may not suit future headcount

What to Do When Commissioning an Office Fit Out

• Get a site survey done before you sign the lease to identify any hidden M&E issues
• Budget for professional fees (10 to 15%) from day one
• Negotiate a dilapidations cap in your lease
• Engage your contractor early using Stage 2 procurement
• Build a 10 to 15% contingency fund into your total project budget
• Specify demountable partitioning where possible to limit future reinstatement costs
• Factor in Licence to Alter costs and timeline before committing to a move date

What Not to Do When Commissioning an Office Fit Out

• Don’t begin construction before the Licence to Alter is executed
• Don’t skip structural or MEP surveys on older buildings
• Don’t cut professional fees to save money upfront
• Don’t rush the programme in summer months (contractor scarcity pushes costs up sharply)
• Don’t use consumer-grade furniture in a commercial environment
• Don’t ignore the dilapidations liability until the end of your lease
• Don’t over-specify technology for a team that doesn’t use it

Total Cost of Occupancy: The Complete Budget Checklist

Most people only budget for the build. Here is the full picture of what a complete commercial tenancy actually costs, from signing the lease to handing it back.

How Much Does an Office Fit Out Cost? Use Our Office Fit Out Cost Calculator

Need an immediate benchmark for a new build or an office refurbishment cost? While an interactive office fit out cost calculator provides the best bespoke data, you can use our manual 2026 formula below to estimate your capital requirements right now, use this formula:

1. Take your Square Footage: (e.g., 3,000)
2. Multiply by £90: (Mid-spec construction + basic furniture) = £270,000
3. Add 12.5% for Professional Fees: = £33,750
4. Add £5,000 for Licence to Alter Legal Fees: = £5,000
5. Set aside £20 per sq ft for Future Dilapidations: = £60,000.
6. Total Capital Required: £308,750 (with £60k reserved for exit).

How Long Does an Office Fit Out Take?

The timeline for your project is dictated by square footage and specifications. A standard office fit out or refurbishment for spaces up to 10,000 sq ft, will typically take 8 to 14 weeks to complete on site. For highly complex, premium builds or floorplates exceeding 10,000 sq ft, timelines often extend by up to 6 months to accommodate complex structural changes and extensive mechanical and electrical (M&E) commissioning. This does not include the 4 to 12 weeks required prior to construction to secure your Licence to Alter.

Final Word: Budget for the Whole Journey, Not Just the Build

The biggest mistake tenants make when planning an office fit out is budgeting only for what they can see: the walls, the flooring, the furniture. The costs that blindside people are the ones that sit outside the construction contract: the Licence to Alter, the professional fees, the contingency, and the dilapidations provision at the end of the lease.

A complete, honest budget for a UK office fit out looks like this: take your base construction cost, add 10 to 15 per cent for professional fees, add your technology and furniture allowance, add £5,000 to £25,000 for pre-construction legal costs, and set aside a dilapidations provision from day one. That is your real number.

The UK market in 2026 rewards tenants who plan carefully, engage contractors early through Stage 2 procurement, and treat sustainability as a financial tool rather than a marketing exercise. The companies that do this well are not spending more. They are spending smarter.

Whether you are fitting out a 1,500 sq ft startup space or a 15,000 sq ft corporate headquarters, working with a contractor who understands the full cost lifecycle is the single most effective way to protect your investment. That kind of specialist guidance is what separates a well-managed fit out from one that blows the budget before the first partition is installed. To see exactly how modular design and Stage 2 procurement have successfully protected tenant budgets from spiralling costs in the real world, review our recent commercial office fit out projects(https://buonconstruction.com/projects) at Buon Construction.

FAQs

These are the questions real tenants, startup founders, and SME owners ask on Reddit, Quora, and Google. Here are direct, precise answers.