What is the difference between FD30 and FD60 fire doors?

FD30 doors provide 30 minutes of fire resistance and FD60 doors provide 60 minutes. FD30 is standard for most domestic and low-rise applications (flat entrance doors, corridor doors). FD60 is required for higher-risk locations such as staircase enclosures in buildings over 18m, plant rooms and some commercial applications.

What ironmongery is needed on a fire door?

At minimum: 3 x CE-marked steel hinges (100mm), intumescent strip (and cold smoke seal if required), and a self-closing device. The closer must be CE marked to at least power size 3. All ironmongery must be tested as part of a fire door assembly or have separate fire test evidence.

What gap should be around a fire door?

The standard gap specification is 3mm (+/- 1mm) at the head and both jambs when the door is closed. The threshold gap should not exceed 8mm (10mm for some test evidence). Consistent gaps are critical because the intumescent strip must expand to fill the gap in a fire.

Can you fit a letterbox in a fire door?

Letterboxes can be fitted to FD30 fire doors if a fire-tested letterbox plate is used, but they are generally not permitted in FD60 doors or doors to protected stairways. The letterbox must have an intumescent liner and meet the test evidence for the door assembly.

How much does a fire doorset cost in the UK?

A complete FD30 doorset (door, frame, intumescent seals, 3 hinges, overhead closer) typically costs £350-£550 supply and install. FD60 doorsets cost £500-£800. Glazed fire doors add £150-£300. These prices include fitting but not decoration.

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Fire Door Specification Calculator

Specify fire doors to Approved Document B and BS 476/EN 1634 standards. Calculate costs for complete fire doorsets including ironmongery, seals and self-closers.

Fire Rating

FD30 for most domestic, FD60 for higher risk

Door Type

Solid timber is the standard domestic option

Location

Determines minimum spec requirements

Number of Doors

Total fire doors needed

Price per Door Leaf

Door leaf only (excl. ironmongery)

How We Calculate This

This calculator specifies fire doors to Approved Document B and calculates the total cost including all required ironmongery.

The formula

Doorset cost = Door leaf + Ironmongery + Installation

Door leaf cost varies by rating (FD30/60/90/120) and type
Ironmongery: closer + hinges + seals + lock furniture
All components must have compatible fire test evidence

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.