Office Fit Out
Full CAT A and CAT B office fit out services. Design, build and furnish under one roof.
Complete Office Fit Out Services Across the UK
An office fit out transforms empty or outdated commercial space into a fully functioning workplace tailored to your business. It is one of the most significant investments a company can make, and getting it right has a direct impact on productivity, culture, recruitment, and how your clients perceive you.
District Four Design is an office fit out company with offices in Doncaster and London, delivering design-led fit out projects for businesses across Yorkshire, London, and the wider UK. We are not just contractors who follow instructions – we are office fit out specialists who bring design thinking, strategic planning, and meticulous project management to every project.
What Is an Office Fit Out?
An office fit out is the process of making a commercial interior space suitable for occupation. This can range from basic servicing of a shell space through to a complete turnkey solution that includes partitioning, mechanical and electrical services, flooring, decoration, furniture, technology infrastructure, and branding.
The scope depends on the condition of the existing space, the requirements of your business, and the experience you want to create for your people and visitors. Understanding the different categories helps you brief your office fit out company effectively and set realistic expectations for budget and timeline.
Types of Office Fit Out
CAT A Fit Out
A CAT A fit out – sometimes called a Category A or shell and core fit out – brings a bare commercial space up to a standard ready for occupation or further customisation. CAT A works typically include:
- Raised access flooring
- Suspended ceilings
- Basic mechanical and electrical services
- Fire detection and suppression systems
- Basic lighting
The result is a blank canvas that meets building regulations and is ready for a CAT B fit out. CAT A fit outs are most common in speculative office developments where landlords prepare floors for incoming tenants.
CAT B Fit Out
A CAT B fit out transforms a CAT A shell into a bespoke working environment. This is where the personality of your business comes through. CAT B works include partitioning to create meeting rooms and private offices, reception and breakout areas, kitchen and amenity spaces, feature lighting, branded finishes, AV and technology installations, and all furniture, fixtures, and equipment.
CAT B is the most common type of office fit out that businesses commission. It is the stage where design, brand identity, and workplace strategy come together to create a space that reflects who you are and supports how you work.
Turnkey Fit Out
A turnkey office fit out covers everything from start to finish. District Four Design specialises in turnkey delivery, managing the entire journey from initial design concept through construction, furniture supply, technology installation, and final snagging.
With a turnkey approach, you deal with a single office fit out company throughout, reducing risk and simplifying communication. You receive the keys to a fully finished, ready-to-occupy workspace. Everything is in place, tested, and working. Your team can move in and start being productive from day one.
Our Approach: Design, Build, Furnish
What makes District Four Design different from many office fit out companies is our integrated approach. We do not separate design from delivery. Our design-build-furnish model means the team who creates your concept is the same team who manages its construction and furnishes the finished space.
This integration eliminates the gaps that appear when design consultants, fit out contractors, and furniture suppliers operate independently. There are no finger-pointing moments, no design intent lost in translation, and no surprises at handover.
Design
Our interior designers and workplace consultants develop concepts grounded in your brief, your brand, and the way your people actually work. We use space planning, 3D visualisation, and material specification to create designs that are both inspiring and buildable.
Build
Our project management team coordinates all construction works, managing subcontractors, monitoring quality, and keeping the programme on track. We handle everything from demolition and strip-out through to mechanical and electrical installation, partitioning, decorating, and final finishes.
Furnish
As contract furniture specialists, we source, specify, and install all workplace furniture. From task chairs and desking systems to soft seating, acoustic pods, and bespoke joinery – we supply and install everything your space needs to function beautifully.
One team from start to finish
No subcontractor roulette. No finger-pointing. We handle design, construction and furniture under one roof, giving you a single point of contact from first call to final handover.
Discuss Your Project →The Office Fit Out Process
A successful office fit out follows a structured process. Here is how we manage projects at District Four Design.
Briefing and Workplace Analysis
We start by understanding your business, your people, and your objectives. This includes headcount analysis, departmental adjacency mapping, technology requirements, and brand identity review. For larger projects, we may conduct occupancy studies and staff surveys to build an evidence base for the design.
Design Development
Our designers translate the brief into spatial concepts, developing floor plans, 3D visuals, material palettes, and furniture selections. We present options and work collaboratively to refine the design until it meets your expectations and budget.
Pre-Construction Planning
Before any work begins on site, we finalise all specifications, procure materials and furniture, agree the construction programme, and obtain any necessary permits or approvals. Thorough pre-construction planning is the foundation of a smooth fit out.
Construction and Installation
Our site team manages all construction activity, coordinating trades and maintaining strict quality control. We provide regular progress updates and manage the programme to minimise disruption to your business operations – particularly if you are remaining in occupation during the works.
Furniture Delivery and Installation
Furniture is delivered and installed according to the approved layout, with each item checked against specification. We manage the logistics of multi-room, multi-floor installations to ensure everything is in place when your team arrives.
Handover and Aftercare
At completion, we conduct a thorough snagging inspection and walk-through with you. Any items requiring attention are resolved promptly. We provide operation and maintenance information for all installed systems and remain available for aftercare support.
How Long Does an Office Fit Out Take?
The duration of an office fit out depends on the size and complexity of the project. As a general guide:
- Small to medium offices (2,000 – 5,000 sq ft): 8 to 12 weeks from start on site
- Larger projects (10,000 – 30,000 sq ft): 12 to 20 weeks
- Very large or complex projects: timelines vary based on scope
The design phase preceding construction typically takes 4 to 8 weeks, depending on the complexity of the brief and the speed of decision-making. We work to agreed programmes with clear milestones, keeping you informed at every stage.
What Does an Office Fit Out Cost?
Office fit out costs vary significantly depending on the specification, location, and scope. As a broad guide, UK office fit out costs typically range from:
- Standard CAT B fit out: Around £65 per square foot
- Premium specifications: £140 or more per square foot (bespoke joinery, high-end materials, advanced technology)
These figures include design fees, construction, furniture, and project management. London projects tend to sit at the higher end due to labour and logistics costs, while projects in Yorkshire and the North of England can often achieve excellent results at more competitive rates.
We provide detailed cost plans early in the design process, giving you full visibility of where your budget is being allocated. There are no hidden costs or surprise variations. We believe in transparent pricing and work hard to deliver maximum value within your budget.
Sectors We Serve
District Four Design delivers office fit out projects across a range of sectors, including professional services, technology, financial services, creative industries, education, and healthcare. Each sector brings specific requirements – from the security and compliance needs of financial firms to the collaborative, agile environments favoured by technology companies.
Our cross-sector experience is a genuine advantage. Ideas from one sector regularly inform our approach in others, resulting in workplaces that are fresh, functional, and forward-thinking.
One team from start to finish
No subcontractor roulette. No finger-pointing. We handle design, construction and furniture under one roof, giving you a single point of contact from first call to final handover.
Discuss Your Project →Why a Single Office Fit Out Provider Matters
Many businesses make the mistake of appointing separate consultants for design, separate contractors for construction, and separate suppliers for furniture. This fragmented approach creates coordination challenges, increases the risk of errors, and often results in a finished space that falls short of the original vision.
Working with a single office fit out company like District Four Design eliminates these risks. We take responsibility for the entire project, from concept to completion. There is one point of contact, one programme, one budget, and one team committed to delivering the result you expect.
This integrated model also saves time. Design and procurement can overlap with construction planning, and furniture lead times are managed alongside the build programme. The result is a faster, smoother process and a better outcome.
Why Choose District Four Design
District Four Design is an office fit out company built on the belief that workplaces should be designed with the same care and creativity as any other significant business investment. We combine design expertise with construction capability and furniture supply, delivering complete office fit out solutions from our offices in Doncaster and London.
Our team has delivered fit out projects across Yorkshire, London, the Midlands, and beyond. We understand the commercial realities of office fit out – the need to manage costs, minimise disruption, and deliver on time. But we also believe that great workplaces deserve great design, and we never compromise on the quality of the environments we create.
If you are planning an office fit out and want to work with office fit out specialists who care as much about your project as you do, we would love to hear from you. Whether you need a straightforward CAT B fit out or a complete turnkey transformation, District Four Design has the expertise and passion to deliver a workspace you will be proud of.