How to Plan Evacuation Lighting for Your Premises

When the mains supply fails during a fire, a familiar corridor can quickly become a hazard. Knowing how to plan evacuation lighting means looking beyond fitting a few emergency luminaires: the system must help people identify escape routes, negotiate changes in level and reach a place of safety without panic or delay.

For UK duty holders, emergency lighting is a practical part of fire safety management. It supports evacuation arrangements, protects staff and visitors, and provides evidence that reasonable precautions have been considered. The right design will depend on the building, its occupants, the risks identified and how the premises operate after hours.

Start with the fire risk assessment

Emergency lighting should not be planned in isolation. Begin with a current fire risk assessment and review the building's fire strategy, escape plan and fire alarm arrangements. This identifies who may need to evacuate, where they will travel, and where a loss of normal lighting would create unacceptable risk.

Consider more than the obvious corridors and final exits. A warehouse with marked pedestrian routes has different needs from a school, care setting, office block or retail unit. Night workers, lone workers, contractors, customers unfamiliar with the building and people with limited mobility may all need additional consideration.

The assessment should establish whether occupants can leave immediately on alarm, whether there are phased evacuation arrangements, and whether any areas are used when the building is otherwise closed. It should also account for changes to layouts, storage, partitions or use of rooms. A lighting design that was suitable before a refurbishment may no longer cover the actual route people use.

Map every part of the escape journey

A useful plan follows the evacuation route as a person would. Start at each occupied area, then trace the route through corridors, stairways, lobbies and exits to the external place of relative safety. Emergency lighting is needed not only along the route itself, but also where people must make decisions or overcome hazards.

Particular attention is normally required at changes of direction, intersections, staircases, ramps, changes in floor level, fire alarm call points, firefighting equipment and exit doors. Lighting should also help occupants safely operate emergency escape devices where these form part of the route.

Open areas need consideration too. In larger rooms, people may need enough light to locate a defined escape route rather than simply move towards a visible door. Toilets, plant rooms, first-aid rooms, lift cars where relevant, refuge areas and rooms larger than a small cupboard can also require emergency provision depending on the risk and occupancy.

Do not confuse escape lighting with signs

Internally illuminated or externally lit escape signs tell people which way to go. Emergency luminaires provide illumination for the route and the hazards within it. Many premises require both, particularly where an exit is not immediately apparent or where visitors may not know the layout.

Sign positions, viewing distances and directional arrows should match the agreed evacuation strategy. A well-lit sign pointing towards a route that is blocked, altered or poorly illuminated creates a false sense of safety.

Select the right emergency lighting arrangement

The main choice is often between maintained and non-maintained emergency lighting. Maintained fittings operate as part of the normal lighting installation and remain illuminated if the mains fails. They are commonly used where the public is present, such as cinemas, shops, hotels and entertainment venues.

Non-maintained fittings only operate when the normal supply fails. They can be appropriate where normal lighting is regularly on while the building is occupied, including many offices and industrial premises. The correct approach depends on the fire risk assessment, building use, existing lighting controls and whether occupants may be present when normal lights are switched off.

A professional design may use a combination of self-contained fittings and a central battery system. Self-contained units can be straightforward to install and maintain in smaller premises. Central systems may suit larger or more complex sites, but require careful design, monitoring and battery-room considerations. Neither is automatically better - whole-life cost, access for testing, expansion plans and the site’s maintenance capability all matter.

Choose duration around the building's needs

Emergency lighting must operate for long enough to allow safe evacuation and any necessary safety procedures. Three-hour duration is widely used because it provides resilience where premises may be reoccupied before batteries have fully recharged, or where evacuation could take longer. Shorter durations can be suitable in some circumstances, but should be justified by the fire risk assessment and system design.

Do not assume that a fitting marked as emergency lighting will provide suitable coverage or duration. Its light output, mounting height, beam distribution, battery performance and position all affect the result.

Design to recognised British Standards

Emergency escape lighting should be designed and installed in line with the relevant standards, most notably BS 5266-1 and the illumination principles in BS EN 1838. These standards help designers establish lighting levels, positioning, duration, testing and documentation requirements.

As a guide, escape routes up to two metres wide are generally designed to achieve at least 1 lux along the centre line, while open-area or anti-panic lighting is generally designed to achieve at least 0.5 lux across the core area. Higher-risk task areas may need significantly more illumination so that people can complete a shutdown or safety action before leaving. The exact design must account for the layout and the luminaires selected, rather than relying on broad rules of thumb.

Photometric design calculations are particularly valuable in premises with high ceilings, complex layouts, racking, mezzanines or long travel distances. They demonstrate whether the proposed fittings will achieve the required illumination where it is needed, not just whether enough units have been installed.

Plan the system around real operating conditions

A compliant drawing is only one part of a dependable installation. Think about what happens during normal trading, cleaning, maintenance and power disruption. Emergency fittings must not be obstructed by new signage, racking, displays or suspended services. Decorative lighting, daylight and reflective surfaces can also conceal poor coverage until an emergency occurs.

Where external escape routes are used, assess the need for emergency lighting beyond the final exit. A route across a yard, car park or service road may be safe in daylight but unsuitable in darkness or poor weather. The boundary of the emergency lighting system should be based on where people can reach a safe location, not simply where the building ends.

For multi-site organisations, consistency can make compliance easier to manage. That does not mean copying one layout across every building. It means maintaining clear standards for surveys, records, testing, remedial works and reporting while tailoring each system to its premises.

Build testing and maintenance into the plan

Emergency lighting is only protective if it works when normal power fails. The plan should therefore include access for inspection, functional testing and replacement of batteries or luminaires. Fittings installed above racking or inaccessible ceilings can turn routine testing into disruption and expense.

Routine monthly functional tests and a full annual duration test are commonly required as part of an emergency lighting maintenance regime, with results recorded in a logbook. Tests should be managed carefully so that the building is not left without adequate emergency cover, and failed fittings should be repaired promptly.

Automatic testing systems can reduce the manual burden, particularly across larger estates, but they do not remove the need for competent review. A reported fault still needs investigation, rectification and a record of the action taken. Maintenance records should sit alongside design information, test certificates and any changes to the escape plan.

Use a competent survey and design process

The most reliable route is a site survey by a competent fire safety specialist who can assess the building, produce a design and coordinate installation with your wider fire protection measures. This avoids common problems such as gaps around stairwells, incorrect sign directions, unsuitable fittings in dusty or damp areas, and emergency units connected to circuits that do not behave as expected during a failure.

Before work starts, agree the scope, access arrangements, programme and how disruption will be controlled. On completion, ask for clear handover documentation, including drawings, test information, operating instructions and details of future servicing requirements. If the system is taking over an existing installation, identify any legacy defects rather than assuming old fittings meet current needs.

A properly planned emergency lighting system is not simply a compliance item on a checklist. It gives people a clearer, safer route out when visibility and familiarity disappear. For premises with changing layouts, multiple sites or complex risks, a competent survey can turn that responsibility into a practical, maintainable plan - and give duty holders confidence that the system will perform when it matters.