Cat A & Cat B
Electrical Fit-Outs
Whether you're fitting out a shell space or reconfiguring an existing office, we handle every electrical element from the incoming supply through to final commissioning.
Cat A -- Base Build
Cat A is the shell and core electrical installation -- bringing a raw space up to a lettable standard. This is the landlord's responsibility, providing the infrastructure that every future tenant needs. We work directly with developers, landlords, and managing agents to deliver Cat A to specification.
- Main distribution boards and TPN sub-distribution -- sized for the building's total maximum demand with spare capacity for tenant loads
- Riser cabling and vertical distribution -- SWA or LSOH sub-mains from the main switchroom to each floor's landlord DB
- General lighting grid -- LED panel, recessed, or track to achieve 300-500 lux across open plan areas per CIBSE LG7
- Emergency lighting to BS 5266 -- covering all common areas, corridors, stairwells, and final exits. Self-contained or central battery
- Landlord's fire alarm system -- main panel, detection on common areas, interface units for future tenant zone expansion. BS 5839-1 Category L2 minimum
- Power busbar and perimeter trunking -- providing take-off points for future tenant distribution boards
- Landlord metering and isolation -- CT metering on the incoming supply, main isolators for each lettable unit
- Common area power -- lifts, mechanical plant, WCs, lobbies, external lighting
Cat B -- Tenant Fit-Out
Cat B is where the space becomes yours. We take the Cat A infrastructure and build out every electrical element specific to your business -- desk power, data, lighting, AV, kitchens, server rooms, and everything in between. We work with your designers, IT team, and other trades to deliver a coordinated installation.
- Desk power -- typically 1 twin socket per desk position (100W allowance per desk). Floor boxes or dado trunking depending on layout
- Floor box installations -- 3-compartment (power, data, AV) flush or surface mounted. Typically 1 floor box per 2 desk positions in open plan
- Dado trunking systems -- 3-compartment galvanised or PVC dado for perimeter offices and meeting rooms. Power, data, and AV segregated
- Feature and task lighting -- pendant fittings, track spots, under-cabinet LEDs, meeting room dimming via DALI
- Meeting room AV power and data -- dedicated circuits for displays, video conferencing, projectors. Data points for room booking panels
- Kitchen and breakout areas -- dedicated circuits for dishwashers, commercial coffee machines, microwaves, boiling water taps
- Server room / comms room -- dedicated DB, UPS circuit, precision cooling circuit, environmental monitoring, dual-feed power where required
- Final testing, commissioning, and NAPIT certification. Full O&M documentation and as-built drawings at handover
