Glazed Fire Doors: Costs, Glass Types and Specification
By the DC Fire & Security engineering team — installing and maintaining fire and security systems since 2010. Updated June 2026.
Quick answer
A vision panel adds £150–£400 per door over the solid equivalent, using fire-rated glass in a certified glazing system. The options run from Georgian wired (integrity-only, cheapest) through ceramics like Pyran (clear) to laminated intumescent types like Pyrostop, which add insulation ratings. Corridor and classroom doors take glazing for supervision and borrowed light — but the certification scope dictates what sizes and systems you can actually use.
Glass types and their jobs
Integrity (E) holds flame/smoke; insulation (EI) also blocks heat transfer — escape routes alongside high fire-load rooms and certain compartment lines specify EI, which is where laminated intumescent glass earns its premium.
| Glass | Rating character | £ relative | Notes |
|---|---|---|---|
| Georgian wired | Integrity (E) only | £ | The traditional look; impact-safety questions in critical locations |
| Ceramic (Pyran/Keralite-class) | Integrity, clear views | ££ | Modern default for E-rated vision panels |
| Laminated intumescent (Pyrostop/Pyrobel-class) | Integrity + insulation (EI) | £££ | Blocks radiant heat — where EI ratings or escape-route protection demand |
| Rated + safety combinations | Per spec | ££–£££ | Impact classes (EN 12600) layered with fire — schools/public buildings |
Where glazing belongs (and its rules)
The functional cases: corridor doors (borrowed light + collision avoidance — institutional standard), classroom/office doors (supervision sight-lines — safeguarding and management both), stair doors (seeing smoke/people before opening), and reception/circulation doors where blank leaves feel carceral. The rules threaded from the glazing guide: apertures only within tested scope (size/position limits per door certification), certified glazing systems (beads, intumescent liners, fixings as tested — not putty-and-hope), safety-glass impact classes where children/public traffic (wired glass's quiet retirement from schools follows), and replacement discipline (broken panels reglazed to system spec by competent fitters — the general-glazier float-glass swap being the inspection failure that keeps giving). Stamps in corners are the audit trail — unstamped glass in fire doors is unproven glass.
Costs and procurement notes
Money: factory-glazed doorsets carry vision panels at £150–£400 over solid (size/glass-type dependent — EI laminates at the top); retrofit aperture creation in existing certified doors is certification-scope surgery (possible within tested configurations via certificated installers — £250–£500 where permitted; refused where not, per the modification rules); reglazing failed panels £150–£400 by system. Specification advice: order glazing factory-fitted wherever programmes allow (the doorset logic — tested, documented, warranted), match glass to the actual requirement (E vs EI per fire strategy — paying Pyrostop prices for corridor borrowed-light that E-class serves wastes budget; the reverse fails compliance), and document glass types per door in the schedule (future reglazing inherits the spec — the records habit). Schools note: impact-class layering is non-negotiable in pupil traffic — the manufacturers guide's spec-tier makers certify the combinations cleanly.
Frequently Asked Questions
Can we add a window to an existing solid fire door?
Is Georgian wired glass still compliant?
Why did our 'fire glass' fail inspection?
EI glass everywhere to be safe?
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