Whether you are an asset manager seeking to minimise void periods or a commercial tenant evaluating leasing options, understanding the differences between Cat A, Cat A+, and Cat B fit-outs is essential for project planning and financial budgeting.
A landlord fit-out refers to the design and construction works undertaken by a property owner to bring a commercial space up to a rentable, functional standard. Depending on market demand, building age, and target tenant demographics, the scope of these works varies significantly.
The Three Stages of Commercial Fit-Outs
Commercial fit-outs follow a defined progression, moving from a basic structural shell to a fully branded, operational workspace.
Shell & Core
- What it is: The bare bones of the building delivered by the primary developer.
- What’s included: The concrete structure, external cladding, windows, and core building utilities (main power, water, lift shafts, and fire escapes).
- Space condition: Unfinished, concrete floorplates with exposed services, completely unhabitable for an office team.
Cat A
- What it is: The basic landlord fit-out that turns a raw shell into a functional, rentable office environment.
- What’s included: Raised access flooring, suspended ceiling grids, standard LED panel lighting, basic HVAC distribution, perimeter trunking, and plastered walls.
- Space condition: A clean, neutral, open-plan space ready for a tenant to move in and construct their own interior layout.
Cat A+
- What it is: A landlord-funded, fully fitted office designed to bridge the gap between Cat A and Cat B.
- What’s included: Everything in Cat A, plus built-in meeting rooms, a fitted tea point/kitchen, loose furniture, desks, breakout areas, and active power/data connections.
- Space condition: Turnkey and move-in ready, a tenant can simply drop down their laptops and start working on day one.
Cat B
- What it is: A bespoke interior design built specifically around an individual tenant's brand, operational needs, and company culture.
- What’s included: Everything in Cat A, plus custom partition walls, branded reception features, high-end AV meeting tech, specialised acoustic treatments, tailored lighting, and custom staff amenities.
- Space condition: A fully branded, highly customised home for a specific business.
Cat A Fit-Out: The Baseline Commercial Space
A Cat A fit-out delivers a clean, neutral, and functional interior shell. It provides the basic operational infrastructure required for a tenant to move in and install their own bespoke design.
Landlords typically commission Cat A refurbishments following the end of a tenancy or during the redevelopment of empty floorplates to make the property market-ready.
Key Components of a Cat A Specification:
- Raised access flooring and suspended ceiling grids.
- Standard LED lighting layouts and emergency lighting systems.
- Basic mechanical and electrical (M&E) services, including main HVAC distribution.
- Essential fire detection, alarm systems, and sprinkler extensions.
- Finished internal perimeter walls and basic window reveals.
- Compliant core toilet facilities and lift lobbies.
Cat A+ Fit-Out: The Rise of "Plug & Play" Workspaces
Over recent years, tenant expectations have shifted toward speed, flexibility, and reduced upfront capital expenditure. This has driven rapid growth in Cat A+ fit-outs (often referred to as Plug & Play or fitted space).
A Cat A+ fit-out bridges the gap between basic landlord provisions and full tenant customisation. The landlord invests in fitting out the office with essential furniture, tea points, and technology, allowing incoming businesses to start working immediately upon signing the lease.
| Feature Comparison | Cat A Fit-Out | Cat A+ (Plug & Play) |
| Primary Target | Traditional corporate occupiers | Flexible, fast-growth, or regional teams |
| Teapoint / Kitchen | Plumbing capped off only | Fully installed and operational |
| Furniture & Workstations | None provided | Fully furnished (desks, chairs, breakout) |
| IT & Data Cabling | Main distribution points only | Fully cabled with plug-and-play capability |
| Meeting Spaces | Open floorplate | Built-in meeting rooms and quiet zones |
| CapEx Responsibility | Tenant builds out interior | Landlord funds initial build-out |
Cat B Fit-Out: The Fully Customised Operational Office
A Cat B fit-out transforms a Cat A space into a fully customised environment tailored to a specific company’s brand, culture, and daily operations. This phase is traditionally funded and managed by the incoming tenant.
It takes into account team structures, departmental workflows, acoustic requirements, and specialized IT infrastructure.
Key Components of a Cat B Fit-Out:
- Bespoke reception areas, client suites, and branded feature walls.
- Individual private offices, team collaboration zones, and quiet pods.
- Custom tea points, staff kitchens, and welfare facilities.
- High-density IT cabling, audio-visual (AV) meeting suites, and server room installations.
- Specialised architectural lighting, acoustic treatments, and branded finishes.
- Furniture selection, loose fixtures, and ergonomic equipment.
Why Landlords Are Investing in Cat A+ Strategies
For property owners and asset managers, providing Cat A+ space has become a powerful tool for attracting occupiers in competitive regional markets:
Reduced Void Periods
Turnkey offices appeal to tenants needing fast relocation, drastically cutting the time a property sits empty on the market.
Premium Rental Yields
Landlords can command higher rent per square foot in exchange for taking on the initial fit-out capital expenditure.
Simplified Lease Negotiations
Removing the friction of tenant build-outs simplifies legal processes and accelerates lease execution.
Partnering with Commercial Fit-Out Specialists
At Oaktree Interiors, we deliver complete commercial design and build solutions for both landlords and corporate occupiers across the Thames Valley and South East.
At Oaktree Interiors, we deliver complete commercial design and build solutions for both landlords and corporate occupiers across the Thames Valley and South East.