When is safety glass required?

If you are specifying glazing for a home, extension or commercial project, you will encounter the term safety glass. In the UK, certain locations demand glazing that either withstands impact without breaking dangerously or retains fragments if it does break. The rules protect people from cuts and from glass falling on them — a particular concern with roof lights installed overhead.

This beginner guide explains when safety glass is required, the main types and how the rules apply to skylights. It is general information, not legal advice; your supplier and building control body confirm requirements for your project.

What is safety glass?

Safety glass is glass that has been processed or constructed to reduce injury risk. The two types you will encounter most often are:

• Toughened glass — heat-treated for high strength; breaks into small granular pieces. Governed by BS EN 12150.
• Laminated glass — two or more panes bonded with an interlayer that holds fragments in place. Governed by BS EN 14449.

Both are classified under BS EN 12600 for impact performance. Wired glass and some plastic glazing systems also appear in specific applications but are less common in modern roof lights.

Critical locations defined in BS 6262

The code of practice BS 6262 sets out which glazing situations are critical locations requiring safety glass. Approved Document K reflects these principles in the Building Regulations guidance for England. Critical locations include:

• Glazing in doors and in side panels within 300 mm of the door edge.
• Low-level glazing in walls — typically within 800 mm of the floor (exact dimensions are in the standard).
• Glazing in walls between 800 mm and 1,500 mm from the floor in certain high-traffic or vulnerable areas.
• Glazing adjacent to stairs, ramps and ladders where impact risk is elevated.
• All overhead glazing — including roof lights, roof lanterns and glazed ceilings.

The height thresholds for walls and doors exist because people — especially children — can fall against or through ordinary glass at low level. Overhead glazing is always critical because gravity turns broken glass into a hazard for anyone below.

What roof lights need

A typical residential roof light uses a toughened outer pane (for weather resistance and impact from external debris) and a laminated inner pane (so if the glass breaks, it stays in the frame rather than falling into the room). This build-up is standard industry practice and aligns with BS 6262 for overhead glazing.

Single toughened panes alone are not sufficient for the inner leaf because toughened glass does not retain — it falls as small pieces. Lamination provides post-breakage retention.

Marking and identification

Safety glass panes must carry a permanent mark — usually a kitemark or manufacturer’s logo — applied during production. After installation, the mark should remain visible in at least one corner. This allows building control inspectors and homeowners to verify that safety glass was supplied. Do not accept unmarked glass for critical locations.

Wired glass and old installations

Older buildings may have wired polished plate glass in roof panels. Wired glass is largely obsolete for new work and does not meet modern impact classifications. Replacement roof lights should use current safety glass build-ups tested to EN standards.

What about small units and glazing bars?

Very small panes divided by glazing bars (Georgian bar aesthetics) may fall under exceptions in BS 6262 based on pane size. Most modern roof lights use comparatively large glass areas without subdivisions. Confirm with your manufacturer if a decorative bar pattern affects the safety classification.

Practical advice for homeowners and specifiers

1. Never cut corners on overhead glazing — safety glass is non-negotiable in roof lights.
2. Ask your supplier for a written specification of the glass build-up (e.g. 6 mm toughened outer + 1.52 mm PVB + 6 mm toughened inner).
3. Ensure the frame and beads are designed to retain laminated glass if both leaves are damaged.
4. Retain certificates and markings for future building control or insurance queries.

Quality roof light manufacturers supply safety glass as standard. Configure your opening through custom roof lights with confidence that the unit is specified for UK regulatory context.

Vant Glass manufactures premium roof lights and glazing in Aintree, Liverpool — made in Britain, 20-year guarantee, free UK mainland delivery. Explore all products or call 03330 902 592.