Office Fit Out Guide: Types, Process, and Costs

An office fit out brings together the layout, building services, furniture, and technology needed for a workplace to function. Its success depends on understanding how people will use the space and turning those requirements into a coordinated, affordable project.

This guide explains what an office fit out includes, the main types, how costs are established, and the process from briefing to occupation.

What Is an Office Fit Out?

An office fit out is the design, installation, and construction work that prepares an interior for office use. It can involve completing an unfinished tenancy or adapting an existing workspace to an organization's requirements.

As a form of fit out construction, it covers the interior elements that make a workplace usable, including its layout, finishes, services, and equipment. The agreed scope determines which elements are retained, modified, or newly installed.

What Does an Office Fit Out Include?

An office interior fit out can include partitions, finishes, building services, furniture, and workplace technology. The scope depends on the existing premises and the facilities the occupier needs.

Some fit out elements may be delivered by the landlord or purchased directly by the occupier. A responsibility schedule should identify who designs, supplies, installs, and tests each item, including connections between separately procured packages.

What Are the Types of Office Fit Out?

Office fit-out categories describe the condition and level of completion of the space. Shell and core, Cat A, Cat A+, and Cat B are commonly used in the UK, although the precise inclusions vary between projects.

The project team should check the actual specification before relying on a category label. In US projects, related work is often described as an office build-out or tenant improvements. Those terms should also be tied to an agreed scope.

A turnkey fit out describes an arrangement for delivering a ready-to-use office. It can cover a Cat B scope, with responsibility for design, construction, furniture, and technology defined in the agreement.

How Much Does an Office Fit Out Cost?

The global average office fit-out cost for a moderate corporate office is USD 2,150 per m², approximately USD 200 per ft², according to JLL's Global Office Fit-Out Costs Guide 2026. Actual project costs depend on location, specification, existing building condition, and the extent of services work.

Its regional averages show why a single global rate needs careful interpretation.

_{Source: JLL, 2026. Square-foot figures are converted from the reported square-meter rates and rounded. These are broad benchmarks, rather than quotations for a particular city or project.}

Before applying these rates to a project, the cost consultant should confirm the benchmark's area basis and treatment of furniture, technology, professional fees, contingency, and taxes.

For a project in London, Sydney, or a US city, the cost consultant should use local evidence and confirm that the benchmark matches the proposed specification and scope.

What should the project budget cover?

The project budget should identify all expenditure needed to deliver and occupy the office, including items outside the main construction contract. Each allowance should be checked against the benchmark's inclusions to prevent omissions or double counting.

• Construction and services: Interior works, services alterations, site preliminaries, and testing.
• Furniture and technology: Workstations, loose furniture, IT, audiovisual equipment, and installation.
• Professional and approval costs: Design, engineering, project management, cost advice, and applicable fees.
• Transition costs: Relocation, temporary accommodation, and any work required at the outgoing premises.
• Allowances and taxes: Contingency and escalation allowances, with applicable taxes and their treatment identified separately.

Existing furniture and partitions should be assessed for retention before replacement is assumed. Any savings need to account for surveys, adaptation, storage, relocation, and testing.

💡 Pro tip: Tender comparisons should reconcile exclusions and owner-supplied items before comparing totals. A lower contract price may leave more work in the occupier's budget.

How Long Does an Office Fit Out Take?

An office fit out can take weeks for limited alterations or several months for a more extensive project. The duration depends on the scope, design development, approval requirements, procurement lead times, and site constraints.

A construction-only schedule leaves out briefing, design, procurement, and preparation for occupation. The project manager should identify which period a quoted duration covers before committing to a move-in date.

The program should work back from occupation and account for:

• Decisions and approvals: Time for user input, design acceptance, and required reviews.
• Long-lead items: Furniture, specialist equipment, joinery, and technology that must arrive in sequence.
• Site restrictions: Working hours, delivery access, service shutdowns, and phased occupation.
• Operational readiness: Testing, staff orientation, relocation, and correction of critical defects.

A lease expiry or planned event should be tested against those dependencies before it becomes the project's promised completion date.

How Does the Office Fit Out Process Work?

The office fit out process moves from defining requirements and checking the premises to developing the design, procuring the work, constructing, and preparing for occupation. Design, cost planning, procurement, and approvals can overlap, depending on the delivery arrangement.

Stage 1: Workplace discovery and project briefing

The occupier and project manager establish who will use the office, what activities it must support, and what is driving the project. User discussions and available occupancy data help test assumptions about desks, meeting rooms, collaboration spaces, and support facilities.

At Atlassian, we tested floors organized around teams and neighborhoods. Some arrangements worked for one team and did not work for another. A team could struggle to expand within its allocated space, which made relocation and growth harder to accommodate.

Facilities, workplace technology, security, and operational teams should contribute while their requirements can still influence the layout.

Output: An agreed brief recording requirements, priorities, budget constraints, and decision-makers.

Stage 2: Premises assessment and concept design

The design team checks whether the proposed workplace fits the building. Surveys and test-fit layouts help identify constraints in services capacity, access, existing construction, and available space.

This is also the point to compare retaining the current fit-out, refurbishing it, or creating a new interior. Early discussions with the landlord should establish the proposed handover condition, building rules, and responsibilities for alterations.

Output: A preferred layout supported by an initial scope, cost estimate, and program.

Stage 3: Detailed design and coordination

Architects, engineers, and specialist suppliers develop coordinated construction drawings, specifications, and schedules. Room layouts need to agree with furniture dimensions, ventilation, lighting, power, data, and audiovisual requirements.

An FF&E schedule records furniture, fixtures, and equipment by location, quantity, specification, supplier, and lead time. It helps the team coordinate selections with the layout, budget, and delivery schedule.

A meeting room illustrates these dependencies. Changing its capacity can affect the table, cooling demand, lighting, microphone coverage, and circulation. The team should resolve these relationships before affected equipment or construction packages are released.

Outstanding decisions should have an owner and a deadline linked to procurement or construction. Later changes need an assessment of cost, schedule, and operational consequences.

Output: Coordinated design information for the packages being released, with outstanding decisions and their implications recorded.

Stage 4: Cost planning and procurement

The project team updates the estimate as the design develops and selects contractors and suppliers against a defined scope. Tender assessments should consider relevant experience, exclusions, program, resourcing, and handover support alongside price.

Early contractor involvement can help test access, sequencing, existing-building constraints, and material lead times. Its scope and relationship to the construction appointment should be agreed at the outset.

The owner needs visibility of the approved budget, commitments, pending changes, and forecast final cost. Mastt's construction cost management software brings these records together to support cost reviews as the project develops.

Output: Contractor and supplier appointments with defined scopes, supported by an updated cost forecast and procurement schedule.

Stage 5: Approvals and construction preparation

The project manager coordinates the landlord approvals and statutory requirements identified by the relevant consultants. The team should establish these requirements early and obtain the necessary approvals before the affected work begins.

Site preparation also covers access, deliveries, protection of retained finishes, and planned service interruptions. In an occupied building, the construction plan needs to address neighboring occupants and the separation of work areas.

Output: Required approvals for the work being released and a coordinated plan for site access, protection, and construction activities.

Stage 6: Construction and installation

Contractors carry out the interior works and services installations in the agreed sequence. Furniture and technology suppliers coordinate deliveries and installation with site readiness.

Inspections should occur before completed work conceals important details. The project manager tracks progress, unresolved issues, and proposed changes against the approved scope, budget, and program.

Where work takes place alongside occupied offices, GSA's guidance on space reconfiguration recommends phased work and measures to separate construction contaminants from occupied areas.

Output: Installed works ready for final testing, with inspection records, approved changes, and outstanding defects documented.

Stage 7: Testing, handover, and occupation

The team verifies that installed systems perform as intended and that the office is ready for use. Handover should include the required records, operating instructions, warranties, training, and a tracked list of outstanding defects.

A construction project handover checklist helps the team track these deliverables and confirm what remains outstanding.

Operational testing should follow everyday tasks, such as entering the office, booking a room, joining a video meeting, and adjusting room controls. The facilities and workplace teams need to know how to operate and maintain the space.

A post-occupancy review then compares actual use with the brief. Feedback on acoustics, room availability, comfort, and navigation can identify adjustments and inform future fit-outs.

Output: An office ready for occupation, supported by testing and handover records, trained operators, and assigned follow-up actions.

Which Office Design Decisions Should Be Resolved Early?

Office fit out design should establish performance requirements, the mix of spaces, and the systems needed to support them. Early decisions about acoustics, technology, adaptability, and daily operation influence both the layout and the delivery scope.

Space mix and room capacity

The mix of desks, focus areas, call spaces, and meeting rooms should reflect expected attendance and the activities people need to perform. The project team should test demand on busy days, including occasions when teams gather at the same time.

Room sizes should suit the expected group sizes, furniture, and equipment, with circulation and accessibility considered in each layout. Test-fit options should also show how team growth or changing work patterns could be accommodated. Recording these assumptions helps the occupier assess whether the proposed layout meets the brief.

Furniture and acoustic performance

Furniture selection should reflect the work being performed, available space, and expected duration of use. Acoustic requirements should distinguish concentration, confidential discussions, video calls, and larger gatherings.

At Atlassian, we set benchmarks for furniture and acoustic treatments across our offices. We wanted staff in Sydney and Bangalore to have the same quality of experience, including furniture that supported them throughout the working day.

The design brief should turn these expectations into specifications that suppliers can price and the team can assess.

Everyday use and shared spaces

Arrival, wayfinding, room booking, and meeting technology should be considered together. A visitor needs a clear route to reception and the right room, while an employee needs reliable access to the equipment required for the task.

Multipurpose rooms also need an operating plan. Furniture storage, room-reset responsibilities, cleaning, and technical support should be established alongside the alternative layouts.

Adaptability and future reuse

Adaptability depends on how readily the space and its services can change. Movable furniture, demountable partitions, and modular meeting rooms should be assessed against acoustic performance, ventilation, accessibility, maintenance, and relocation requirements.

On one Atlassian floor, we retained the existing floor and ceiling and introduced modular meeting rooms. We wanted to test whether the pods could perform like conventionally built rooms, particularly acoustically, and reduce make-good requirements at lease end. We also planned for the possibility of flat-packing them and reusing them at another location.

The cost assessment should include dismantling, transport, storage, and reinstallation. Potential reuse also needs a suitable destination. These considerations sit alongside any reinstatement obligations in the lease.

Office Fit Out Planning Checklist

An office fit out planning checklist helps the project team confirm requirements, responsibilities, and delivery arrangements before committing to work. The table below helps the project team identify what is ready and what still needs attention.

A Workplace That Is Ready to Use

An office fit out gives an organization the opportunity to resolve everyday problems in how its workplace functions. A useful starting point is an agreed brief that connects user needs with the premises, budget, and delivery plan. That gives the project team a clear basis for making decisions and evaluating the completed space.