Sign Size Guide – Get the Right Safety Sign for Maximum Visibility

Choosing the correct size for your safety signs is essential to ensure your message is seen, understood, and acted upon—especially in environments where speed and clarity can save lives. Whether you’re installing fire exit signs, hazard warnings, or construction site safety signage, visibility and readability must meet regulatory and practical needs.

Why Sign Size Matters

Under UK Health & Safety guidelines (including HSE and BS EN ISO 7010), all signs must be clearly visible and easily understood by those for whom they are intended. The size of a sign directly affects how quickly a person can identify it—particularly in an emergency.

Small signs may be missed in larger spaces, while oversized signs may be impractical for tight areas like corridors, stairwells, or office doors. Correct sizing also helps businesses meet insurance and audit requirements.

Standard Safety Sign Sizes (Based on Viewing Distance)

• 150 x 200 mm
  Best for close-range use (up to 3–5 meters)
  Suitable for small rooms, offices, or next to equipment.

• 200 x 300 mm
  Optimal for viewing from 7–9 meters
  Most common choice for general indoor safety signage.

• 300 x 400 mm
  Designed for 14 meters viewing distance
  Effective in warehouses, corridors, or busy work areas.

• 450 x 600 mm
  Appropriate for 21–28 meters visibility
  Recommended for outdoor areas, loading bays, or open-plan spaces.

• 600 x 800 mm and above
  Necessary for long-range visibility (up to 57 meters)
  Used for construction sites, roadworks, or external hazard alerts.

  

How to Choose the Right Sign Size