BS 5266 Emergency Lighting Explained: What London Buildings Actually Need

BS 5266-1:2016 is the UK code of practice for emergency escape lighting in non-domestic premises. It sets out where emergency lighting must be installed, the illuminance levels at floor level along escape routes, the response time after mains failure, and the duration the lighting must remain operational.

The core numbers: emergency lighting must achieve 1 lux minimum along the centre line of any escape route, 0.5 lux minimum across the whole escape route area, and full output within 5 seconds (60 seconds for the full design level). Duration: 3 hours for most premises, 1 hour where staff-aided evacuation is documented in the Fire Risk Assessment.

The standard is referenced by the Regulatory Reform (Fire Safety) Order 2005 as the means of compliance with the duty to provide emergency lighting in workplaces, multi-occupied residential buildings, and any premises where the FRA identifies a need.

Escape route lighting: illuminates the escape path itself — corridors, stairs, exit doors, changes of direction, intersections. This is the basic category every non-domestic building needs.

Open-area (anti-panic) lighting: illuminates large open areas where occupants must find their way to an escape route. Required in rooms larger than 60m² or where occupancy makes finding the escape route difficult. Open-plan offices, restaurants, retail floors, school halls.

High-risk task area lighting: illuminates work areas where a sudden loss of light during a process would create a hazard — commercial kitchens with active fryers, laboratories with reagents, theatres with stage rigging, machine shops with running equipment. Required illuminance is much higher (15 lux or 10% of normal task lighting, whichever is greater).

Non-maintained: the lamp is off under normal mains supply and lights only when mains fails. Most common in escape route fittings in occupied buildings — operates only during the emergency.

Maintained: the lamp is on continuously and remains lit during mains failure. Required in places of assembly with audience seating (theatres, cinemas, conference halls) where occupants are not familiar with the layout.

Sustained (combined): the fitting has two lamps — one normal mains-fed for everyday lighting, one battery-fed only during emergency. Used where the architecture wants a single visual fitting doing both jobs without the always-on cost of a maintained.

Choice is FRA-driven in most cases. For a London restaurant: maintained at exits and along the customer-facing escape route, non-maintained in back-of-house corridors. For a multi-storey office: non-maintained throughout the escape routes with maintained at the final exits.

Self-contained: each fitting has its own integral battery and inverter. Mains fails, the fitting's battery takes over locally. Easy to install, easy to expand, easy to fault-find. Standard choice for buildings up to about 50 fittings.

Central battery: a single large battery bank in a plant room feeds all emergency fittings via dedicated emergency lighting circuits. Used in larger premises where centralised maintenance and battery replacement is more efficient than per-fitting service.

For most London commercial premises self-contained is the practical choice. Battery replacement cycle is 4 years for standard NiCd, 5-7 years for LiFePO4. End-of-life is indicated by failed annual 3-hour discharge test.

Monthly function test: a short flick test (typically 5-15 minutes) confirming each fitting actually illuminates when mains is removed. Can be performed by the building's "responsible person" or in-house facilities team using the manual key-switch or test switch on each fitting (or via the central addressable panel where fitted). Results logged in the fire safety logbook.

Annual 3-hour duration test: full discharge of every fitting under simulated mains failure to confirm the rated duration is achieved. Performed by a competent person — typically an electrical contractor with emergency lighting commissioning experience. Any fitting that fails to last the full 3 hours is identified for battery or unit replacement.

The logbook record is what the FRA assessor and any subsequent Fire Service audit will request. Missing or incomplete logbook entries are a documented Article 13 (Fire Safety Order) failure even where the lighting itself works.

Residential blocks: the Fire Safety Act 2021 and the Building Safety Act 2022 brought communal areas of multi-occupied residential buildings firmly into the FSO 2005 regime. Emergency lighting in stair cores, lobbies, and circulation areas is now treated with the same rigour as commercial premises. Annual 3-hour testing is the documented expectation.

Hotels: BS 5266-1 plus the local borough's fire-safety guidance for hotels. Maintained lighting required in guest corridors at all times, illuminated exit signs at every escape route junction, annual 3-hour test results retained for 5 years.

Schools and care homes: maintained lighting in stairwells and corridors, anti-panic lighting in halls and dining rooms, high-risk task lighting in DT/science/kitchen areas. Annual 3-hour testing during holiday windows aligns with EICR cycles.

Multi-storey commercial: per-floor escape route coverage, lobby coverage at lift cores, anti-panic in open-plan floor plates. Tenanted floors typically include emergency lighting in the lease as a landlord responsibility.

Our standard emergency lighting testing visit is £50.99 base fee covering up to 20 fittings. Additional fittings £1.50 each. The visit includes: monthly function test sweep (if not already in logbook), annual 3-hour discharge test, battery condition assessment, illuminance check at sample points using calibrated lux meter, certificate of testing matching BS 5266-1 reporting format.

Where the visit identifies failed fittings: same-visit fault report with replacement quote, typical LED bulkhead replacement £45-£65 fitted, exit sign replacement £55-£85 fitted. Battery-only replacement (NiCd or NiMH cell pack) £18-£28 per fitting where housing is reusable.

For multi-property landlords and managing agents we offer scheduled annual contracts covering EICR + emergency lighting + fire alarm testing at a bundle rate. The combined annual compliance visit for a typical small office or HMO is £180-£240 inclusive of all three certificates.