2026-09-16 · HawkSwift Ltd

Emergency Lighting Regulations UK: BS 5266-1 Requirements, Testing and Logbook

When the mains fails, the emergency lighting is what lets people find the exit. In the UK it is a legal requirement in most workplaces, shops, restaurants, HMOs and blocks of flats — and the standard that defines compliance changed on 31 October 2025.

The Regulatory Reform (Fire Safety) Order 2005 (RRO) requires the responsible person to provide emergency lighting where necessary, keep it in working order, and prove through records that it has been tested. The recognised benchmark for meeting that duty is BS 5266-1, and the 2025 edition introduces a brand-new obligation: a measured photometric verification every five years. Most buildings have never had one.

This guide covers the legal duties, what changed in BS 5266-1:2025, where lighting is needed, the testing schedule and the records you must keep.

Is emergency lighting a legal requirement in the UK?

Yes, wherever the fire risk assessment identifies the need. There is no blanket "every building must have emergency lighting" rule — the requirement follows risk. But for most non-domestic premises and the common parts of residential buildings, the assessment will conclude that escape routes need illumination if the normal lighting fails — and emergency lighting then becomes a legal duty, not a recommendation.

The requirement is anchored in the Regulatory Reform (Fire Safety) Order 2005, which applies to workplaces, shops, offices, restaurants, care homes, schools, places of assembly, and the common areas of flats and HMOs in England and Wales. Three articles matter most:

Article 14(2)(h) — emergency routes and exits requiring illumination must be provided with emergency lighting of adequate intensity in case of failure of their normal lighting. This is the core duty.
Article 17(1) — every fire safety device, including emergency lighting, must be maintained in efficient working order and good repair.
Article 9 — the fire risk assessment decides *whether* and where emergency lighting is needed. That is why every compliant system starts with a fire risk assessment, not a lighting catalogue.

The consequences are criminal. Under article 32, failing fire safety duties where anyone is put at risk of death or serious injury carries, on conviction on indictment, an unlimited fine, up to two years' imprisonment, or both. Enforcement or prohibition notices (articles 30 and 31) can also be served, and insurers routinely void claims where emergency lighting was not maintained and recorded.

Who is the responsible person?

The responsible person is whoever has control of the premises — usually the employer, building owner, occupier, or managing agent for shared buildings. The duty follows the role, not the person: it cannot be delegated, only the work; a contractor carries out the tests, but the responsible person remains accountable for ensuring they happen and are recorded. Our guide to who is the responsible person under the RRO 2005 explains the role in full.

BS 5266-1:2025 — the standard that defines compliance

BS 5266-1 is the UK code of practice for emergency lighting: design, installation, commissioning, testing and maintenance. It is not itself law, but it is the benchmark enforcing authorities, insurers and courts use to judge whether the RRO duty has been met.

The 2016 edition was withdrawn on 31 October 2025, replaced by BS 5266-1:2025. If your paperwork still cites the 2016 edition, your compliance evidence is formally out of date. The 2025 edition is designed to be read with two updated European standards:

BS EN 1838:2024 — lighting applications: emergency lighting (performance values, including illuminance)
BS EN 50172:2024 — emergency escape lighting systems (system requirements)

The 2025 edition also broadens its scope to three types: emergency escape lighting (getting people out), emergency local area lighting (high-risk task areas where someone must shut down a dangerous process before leaving), and standby lighting (letting normal activity continue through a power failure).

What changed in BS 5266-1:2025

Four changes matter most:

Full-width escape route illumination. The 2016 edition measured 1 lux along the centre line. The 2025 edition, aligned with BS EN 1838:2024, requires at least 1 lux across the full width of the escape route floor — the edges count now, not just the middle. Open (anti-panic) areas need at least 0.5 lux at floor level.
Photometric verification every five years. A completely new requirement: actual light output must be measured with a calibrated lux meter — not just calculated from design — at commissioning and at intervals of no more than five years. A system can pass every monthly and annual test yet still fail to deliver enough light at floor level because of partitions, added storage or ageing fittings. If your system was installed under the 2016 standard, this check has probably never been done.
High-risk task area lighting. Where someone must stop a dangerous process before evacuating, lighting must deliver at least 10% of normal lighting, never less than 15 lux, within 0.5 seconds.
Circuit resilience. On centrally supplied systems, no more than 20 luminaires may be affected by a single circuit fault.

The 2025 edition also expects at least 5 lux vertical illuminance at manual call points, first-aid points and fire-fighting equipment, and tightens commissioning and handover documentation — the logbook is now unambiguously part of the compliance evidence.

Where emergency lighting is required

BS 5266-1 sets out the locations that typically need emergency escape lighting:

Escape routes — every defined route, including changes of direction and level, and every flight of stairs
Open areas larger than 60 m², or smaller areas where people assemble with no defined route
Every final exit and the area outside it
Near fire-fighting equipment — extinguishers, manual call points, first-aid points
Windowless toilets over 8 m² and disabled toilets
Plant and equipment rooms, including their switchboards
Passenger lifts — a lobby must not be left in darkness if the mains fails
Refuges and areas for disabled occupants
Covered car parks and pedestrian escape routes through them

The exact locations come from the fire risk assessment and system design — there is no fixed "number of fittings" rule, but no point on a covered escape route may be left in darkness.

Types of emergency lighting

By mode:

Non-maintained — off normally, comes on when the mains fails; the standard choice for escape routes.
Maintained — runs continuously on the normal supply and stays lit when it fails; used where a permanent presence is wanted (cinemas, nightclubs) and for exit signs.
Combined/sustained — a luminaire with two lamps (one normal, one emergency), or one lamp at reduced output normally and full output in an emergency.

By power supply:

Self-contained — each luminaire has its own battery and charger. The most common approach for smaller premises.
Centrally supplied (slave) — luminaires fed from a central battery system, common in larger buildings.

Duration: one hour or three?

BS 5266-1 sets the minimum rated duration — how long the system must stay lit on battery alone:

3 hours — the standard for most non-domestic premises and for sleeping accommodation (HMOs, blocks of flats, hotels, care homes), where evacuation is slower and people may shelter in place, and where premises may be re-occupied before batteries have recharged.
1 hour — acceptable only where premises are evacuated immediately on mains failure and not re-occupied until the batteries have fully recharged (up to 24 hours). Laboratories and certain factories are the classic examples; it is not appropriate for sleeping accommodation.

Emergency lighting for HMOs, flats and rented homes

The RRO applies to the common parts of premises that contain dwellings — stairwells, corridors, lobbies and the area outside the final exit of a block of flats or HMO need emergency lighting where the risk assessment says so. In practice:

HMOs — emergency lighting is a near-universal licence condition, particularly where there are internal corridors, windowless stairwells, basements or three or more storeys; it almost always goes with a Grade A fire alarm system.
Blocks of flats — purpose-built and converted: communal hallways, stairways, lobbies and covered car parks; converted houses with shared escape routes are often higher risk.
Mixed-use buildings — a flat above a shop with a shared residential entrance: the escape routes serving the residential part need lighting.
Single-family rented houses — usually none needed: there are no common parts for the RRO's duty to bite on, though a complex layout or basement may justify it.

For high-rise residential buildings (18 metres or more, or seven or more storeys), the Fire Safety (England) Regulations 2022 monthly checks cover fire detection and alarm systems, evacuation alert systems and automatic door release mechanisms — emergency escape lighting is not on that list — but the RRO duty under article 14(2)(h) still applies to the common parts.

Testing and maintenance schedule

The RRO creates the duty (articles 14 and 17); BS 5266-1 sets the routine:

| Test | Frequency | Carried out by | |---|---|---| | Functional "flick test" — brief simulated mains failure, confirm every luminaire and exit sign illuminates | Monthly | Responsible person or competent staff, via test key or test switch, never by isolating the supply | | Full-duration discharge test — system runs on battery for its full rated duration (typically 3 hours) | Annual | Competent engineer; unoccupied building or occupants notified | | Photometric verification — measured lux survey against the design specification | At commissioning, then at intervals of no more than 5 years | Competent engineer with calibrated lux meter |

The monthly functional test is the one most premises get wrong. Each fitting is switched to emergency mode via its test key or test switch and confirmed to illuminate within about five seconds, with exit signs visible. It is brief by design — long enough to prove the changeover, short enough not to significantly discharge the battery.

The annual full-duration test discharges the batteries completely — typically three hours — so plan it when the building is unoccupied or with occupants warned. Batteries may need up to 24 hours to recharge after a full discharge, so test one area or circuit at a time and stagger tests so the building is never left wholly unprotected.

The five-year photometric verification is the new obligation. A competent engineer measures the actual illuminance at floor level across escape routes and open areas and certifies it against the design specification. If your system has been running under the 2016 standard, this has never been done — and the five-year clock starts at the first verification.

Defects found at any stage should be rectified as soon as reasonably practicable, with temporary controls (torches, additional signage, closing an area) until repairs are done. A known defect left unrepaired is a breach of article 17 — and, if someone is put at risk, a criminal matter.

The emergency lighting logbook

BS 5266-1 is explicit: an untested or unrecorded system is a non-compliant system. Every monthly test, annual discharge test, photometric verification, fault, repair and battery replacement must be recorded in the fire safety logbook (paper or digital) — the absence of records is treated as a failure to test.

It should show the date of each test, the fittings or circuits tested, the result, defects and rectification, and who carried it out. Keep it alongside your fire alarm logbook and make it available to the enforcing authority on request.

Common compliance failures

No monthly test, or the same fitting tested every month — every luminaire must be exercised
Testing by isolating the supply instead of using the test key — drains batteries and risks leaving the building unprotected
No logbook records — treated as non-compliance
Annual discharge test never done — the flick test does not prove battery capacity
Photometric verification never carried out — the new five-year duty
Batteries past their service life — typically replaced every three to four years
Fittings painted over, boxed in or blocked by storage
One-hour fittings in sleeping accommodation — HMOs and flats need three hours

If any of these sound familiar, fix the immediate issues, then have the whole system surveyed against BS 5266-1:2025 and start a clean logbook.

Where to start

Emergency lighting compliance starts with the fire risk assessment — it determines whether you need a system, where, at what duration, and in which mode. From there: have a competent designer produce a BS 5266-1 compliant scheme, commission it with handover documentation, set up the monthly flick test rota and logbook, and calendar the annual discharge test and five-year photometric verification.

Our compliance document templates include logbooks and record sheets you can adapt, our fire safety courses cover responsible person duties, and we can point you to competent testing contractors. For the rest of the equipment picture, see our guides to fire alarm regulations UK and fire extinguisher types UK — and if you want a second opinion on whether your emergency lighting would stand up to inspection, book a call with our team.

FAQ

Is emergency lighting a legal requirement in the UK? In non-domestic premises and the common parts of blocks of flats and HMOs, yes, wherever the fire risk assessment shows it is needed. The RRO 2005 requires emergency routes and exits needing illumination to have emergency lighting of adequate intensity if the normal lighting fails.

How often should emergency lighting be tested? A brief monthly functional (flick) test of every luminaire and exit sign, an annual full-duration discharge test running the system on battery for its full rated period (typically three hours), and — new under BS 5266-1:2025 — a measured photometric verification at commissioning and at least every five years.

What are the emergency lighting regulations UK? The Regulatory Reform (Fire Safety) Order 2005 creates the legal duty; BS 5266-1:2025 (with BS EN 1838:2024 and BS EN 50172:2024) is the code of practice that defines how to meet it. Approved Document B of the Building Regulations also requires it in specified buildings, such as the common areas of blocks of flats.

Who is responsible for testing emergency lighting? The responsible person — the employer, owner, occupier or managing agent with control of the premises. The monthly flick test can be carried out by a competent member of staff, but the annual discharge test and five-year photometric verification need a competent engineer; the legal duty to ensure testing, maintenance and records cannot be delegated.

Does an HMO need emergency lighting? Most licensed HMOs do, in the common parts — hallways, stairwells, landings, internal corridors and the area outside the final exit. It is a near-universal HMO licence condition, and a 3-hour duration is standard for sleeping accommodation. A single-family rented house with no common parts normally does not need it.

What changed in BS 5266-1:2025? The 2016 edition was withdrawn on 31 October 2025. The new edition requires 1 lux across the full width of escape routes, introduces a measured photometric verification every five years, extends scope to high-risk task and standby lighting, and limits centrally supplied circuits to 20 luminaires per fault.

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