Where to place safety signs: a UK building owner's guide

The principles behind placement

BS 5499-4:2013 — the UK code of practice for safety signs and escape route signing — sets out the principles. They reduce to three:

1. At the action point or hazard. Signs work where the action needs to happen. Fire equipment signs above the equipment. Mandatory PPE signs at the entry to PPE-required zones. Warning signs near the hazard. Don't put signs at the building entrance for actions that happen elsewhere.
2. In line of sight before the decision. The viewer needs to see the sign before they make the relevant decision. For escape routes: at every change of direction, so the viewer always has a sign in line of sight pointing to the next sign or to the exit. For prohibition: visible from the approach so the prohibited action is never started.
3. At a height that works under real conditions. Above head height in a crowd (typically 1.7-2.4m top edge), but not so high that it's outside the natural eye line for someone walking briskly. For accessible signage, at handle height (1500mm) for tactile use.

Mounting height: the detail

BS 5499-4:2013 recommends:

• Standard interior placement: top edge 1.7-2.4m above floor. Above head height in a crowded space; low enough to be in normal eye line.
• Above doorways: just above the door frame, so the sign is visible when the doorway is approached.
• Above equipment (fire extinguisher, hose reel, alarm call point): top edge approximately 2m above the floor (just above the equipment itself).
• Floor-level supplementary signs: 0.15-0.45m above floor, used in high-smoke-risk environments (hotels, sleeping accommodation) to supplement higher signs.
• Tactile / accessible signage: centre at 1500mm above floor (handle height) for accessible toilet identification, lift identification, and key destination signs. Mounted on the latch side of doors so it's reachable without crossing the door swing.
• Outdoor monolith or assembly point: 2.5-3m above ground, mounted on post or monolith, visible from a distance.

Line of sight and visual obstruction

Signs only work if they're visible. Common visual-obstruction failures:

• Signs hidden behind doors when doors are open (common for fire exit signs above corridors)
• Signs blocked by post-installation fittings (notice boards, vending machines, racking)
• Signs faded or damaged (vinyl yellowing, paint flaking, glass etching wearing off)
• Signs at the wrong height for the typical viewer (too high, too low, or behind a counter)
• Too many signs clustered together causing visual overload

Periodic visual audit — typically annual as part of the fire risk assessment review — should check sign visibility against current building layout.

Sign size by viewing distance

The 1-in-200 rule: minimum character height should be at least 1/200 of the maximum viewing distance. So sign size scales with how far away the viewer typically is:

• Up to 5m viewing distance → 100×150mm or 200mm circle
• 5-15m → 200×300mm or 300mm circle
• 15-25m → 300×400mm or 400mm circle
• 25-40m → 400×600mm or 600mm circle
• Over 40m → custom larger sizes

See our viewing distances guide for the full size recommendations.

Where placement gets specific

For specific sign types, see the targeted guides:

• Fire exit sign regulations — illumination, height, placement detail
• No smoking sign requirements — Health Act 2006 placement
• Construction site signage — CDM 2015 placement