How Much Does an Office Fit-Out Cost in the UK?

Whether you are relocating, expanding, or refreshing your current workspace, understanding office fit-out costs in the UK is the foundation of any successful project. A well-executed fit-out transforms how your business operates — boosting productivity, reinforcing your brand, and giving your team a space worth the commute. This guide breaks down what drives costs at every stage, what you can expect to pay in 2026, and how to plan a budget that delivers genuine value.

Factors That Influence Office Fit-Out Costs

Several factors determine what your fit-out will cost. Understanding these before you brief a designer or contractor means you can make decisions that protect both budget and quality.

Location. Office fit-out costs in London are typically 20–40% higher than in regional UK cities. Labour rates, logistics, building access restrictions, and working-hours constraints in central London all contribute to the premium. Surrey, the South East, and major cities such as Manchester and Birmingham sit between the two extremes.

Office size. Cost per square metre generally decreases as project size increases — fixed costs for design, project management, and mobilisation are spread across a larger floor plate. Smaller offices often pay a higher effective cost per square metre as a result.

Type of fit-out. Whether you need a Cat A or Cat B fit-out is the single biggest determinant of cost. Cat A prepares a base build space to a lettable standard. Cat B completes it to an operational, brand-aligned workspace. The difference in cost is significant.

Quality of materials and finishes. Specification choices — flooring grade, ceiling systems, joinery quality, furniture specification — create the widest range of variability within any project. A commercial-grade carpet tile and a premium engineered timber floor both cover the same area at very different cost points.

Design complexity. Bespoke joinery, curved partitioning, feature ceilings, complex lighting schemes, and custom-built reception desks all require more time and skilled labour than standard solutions. Complexity has a multiplying effect across the programme.

Mechanical and electrical works. M&E is frequently the largest single cost line in a fit-out. Older buildings with inadequate existing services, or projects requiring significant alterations to HVAC, data infrastructure, or electrical distribution, will see M&E costs rise substantially.

Office Fit-Out Cost Breakdown (2026)

The following cost ranges reflect UK market rates in 2026. All figures are per square metre unless stated.

Category A Fit-Out

A Cat A fit-out brings a base build or shell-and-core space to a standard lettable condition. It is typically carried out by a landlord before a tenant takes occupation, or by a business taking a shell-and-core lease. It does not include any tenant-specific design, branding, or furniture.

• Suspended ceilings and partitions: £20–£30 per sq m
• Raised access flooring: £25–£40 per sq m
• Basic lighting: £25–£40 per sq m
• HVAC (heating, ventilation and air conditioning): £30–£50 per sq m

Total Cat A range: £60–£120 per sq m

Category B Fit-Out

A Cat B fit-out takes a Cat A space and completes it to a fully operational, branded workplace. This is the most common type of project for businesses taking on a new office or refurbishing an existing one. It includes all the elements that make a space feel and function like your company.

• Partitioning and ceilings (enhanced): £40–£70 per sq m
• Flooring — carpets, engineered timber, LVT: £30–£60 per sq m
• Decoration and painting: £20–£40 per sq m
• Bespoke joinery and furniture: £150–£300 per workstation
• Advanced lighting: £50–£80 per sq m
• AV and IT infrastructure: £100–£200 per workstation
• Specialist areas — kitchen, reception, breakout zones: £200–£500 per sq m

Total Cat B range: £150–£400 per sq m

Additional Costs to Budget For

Beyond the core construction and installation costs, several additional line items affect the total budget. These are frequently underestimated at the planning stage.

Project management fees. A professional project manager typically charges 5–10% of the total fit-out budget. For complex or large projects, this is money well spent — a well-managed programme protects against the cost of variations, delays, and contractor disputes.

Design and consultancy fees. Architectural, interior design, and engineering consultancy fees typically add 10–15% to the overall cost. Office Designer’s online design service is significantly more cost-effective than traditional in-person design, with packages starting from £699.

Legal and compliance costs. Landlord licence for alterations, building regulations approval, and fire risk assessments all have associated costs. In a listed or complex building these can be material; in a standard commercial space they are typically modest.

Contingency. Always allocate a contingency budget of 5–10% of total project cost. Even a well-planned fit-out will encounter unforeseen conditions — particularly in older buildings where hidden M&E infrastructure, structural surprises, or asbestos surveys generate unplanned spend.

How to Manage Fit-Out Costs Without Compromising Quality

A fit-out does not need to be expensive to be excellent. The most effective approach is spending strategically — investing where it is seen and experienced, and making practical choices where it is not.

Plan thoroughly before committing. The most expensive thing a fit-out project can encounter is a design decision made during construction. Variations to agreed scope cost far more than getting the brief right at the start. Resolve all key decisions — room layout, joinery specification, furniture — before work begins.

Set a realistic, all-in budget. Include design fees, project management, contingency, furniture, IT, and VAT from the outset. Budgets that cover construction costs alone consistently result in unpleasant surprises at handover.

Prioritise client-facing and high-traffic areas. Reception, meeting rooms, and breakout space are seen by clients and influence how your business is perceived. These areas warrant investment in quality finishes. Back-of-house and support areas can use more practical specifications.

Use trade-sourced furniture. Working with a designer who has access to trade pricing on furniture and finishes can reduce procurement costs by 20–40% compared with retail pricing, without any reduction in quality.

Choose sustainable and durable solutions. Energy-efficient lighting, quality commercial flooring, and well-specified furniture have higher upfront costs but significantly lower replacement and maintenance costs over the lease term. Cheap solutions often cost more over time.

Negotiate with contractors — but benchmark properly. Always obtain at least two competitive quotes and review the pricing breakdown in detail. Unusually low bids typically include assumptions about scope that will be recovered through variations once work is underway.

Ready to Plan Your Office Fit-Out?

Understanding fit-out costs is only the first step. The difference between a project that delivers and one that disappoints is almost always the quality of the design and planning that precedes construction. A clear brief, a complete design package, and a well-managed procurement process protect both budget and programme.

Office Designer provides professional office interior design entirely online — delivering space planning, 3D visuals, furniture schedules, and full specifications that are ready to hand to a contractor. Our packages start from £699 and are designed to give UK businesses access to expert design without the cost or process friction of a traditional design practice.

Book a free consultation and we will help you understand what your project should cost and how to get the most from your budget.

For reference standards and workplace guidelines, the British Council for Offices publishes regularly updated fit-out and occupancy guidance for UK commercial properties.