Advice · updated November 2026
Cat A vs Cat B fit-out: what is the difference?
Cat A is the basic finish a landlord provides so space can be let. Cat B is the fit-out a tenant adds to make it their own. Knowing which is which tells you what you are paying for.
Shell and core
The bare building: structure, cladding, lifts, reception and toilets in the common areas. The office floors themselves are empty concrete.
Cat A
- Suspended ceilings and lighting
- Raised access floors
- Heating, cooling and ventilation
- Fire detection and basic finishes
- Usually paid for by the landlord
Cat B
- Partitions, meeting rooms and offices
- Kitchens, tea points and breakout areas
- Floor finishes, decoration and branding
- IT, audio-visual and furniture
- Usually paid for by the tenant, sometimes with a landlord contribution
Why it matters
When you take a lease, check what condition the space is handed over in and what you must hand back. Many leases expect the tenant to strip their Cat B out at the end and return the space to Cat A.
This guide is general information, not legal or professional advice. Check your own situation with a qualified adviser.
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