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Fit an FD30 garage-to-house door.
Required between integral garage and house — fire-rated, intumescent strips, self-closer.
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Top tips
Hiring a doors, without the regret.
Four moves that separate a smooth job from a nightmare.
No threshold step
Many older garage doors are flush — water-stained skirting in the house is the giveaway that fuel could flow under.
Plasterboard ceiling missing
A garage ceiling that's just rafter underside is not 30-minute fire resisting. Insulating and boarding it is part of the upgrade.
Letterbox in the door
A common DIY error — any letterbox void the certification. There should be no penetrations through the door.
Wedged open
Homeowners often wedge the garage door open for ventilation. Fit a swing-free hold-open device with smoke detection linkage.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
White-paint FD30 slabMDF facing, Certifire-rated
£120–£250
Oak veneer FD30 slabReal oak finish
£200–£500
Hardwood FD30 lining setTo match slab
£60–£180
Intumescent strips, brush sealsAround perimeter
£15–£40
FD30 hinges (3x CE-marked)Grade 13 minimum
£25–£80
Self-closer (concealed)Briton, Perko
£40–£180
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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The internal door between an integral or attached garage and the house is the single most important fire door in any UK home. Building Regulations require it to be FD30 — holding back fire and smoke for 30 minutes. Expect to pay £250–£900 fitted in the UK, including the door, frame, ironmongery and threshold detailing.
What Does the Work Involve?
The whole assembly is a fire-resisting element — slab, frame, hinges, latch, smoke seals and intumescent strips are all tested as a system. The threshold must rise 100mm above the garage floor (Part J / Part B) to contain spilled fuel and prevent flame travel under the door. The walls and ceiling of the garage must also be 30-minute fire-resisting — this is usually a single layer of 12.5mm plasterboard properly taped and skimmed. A self-closer is good practice though not legally mandated for typical 2-storey dwellings.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| White-paint FD30 slab | 120 | 250 | MDF facing, Certifire-rated |
| Oak veneer FD30 slab | 200 | 500 | Real oak finish |
| Hardwood FD30 lining set | 60 | 180 | To match slab |
| Intumescent strips, brush seals | 15 | 40 | Around perimeter |
| FD30 hinges (3x CE-marked) | 25 | 80 | Grade 13 minimum |
| Self-closer (concealed) | 40 | 180 | Briton, Perko |
| Threshold step (100mm) | 40 | 120 | Hardwood or steel angle |
| Carpenter labour | 180 | 400 | Half a day total |
How Long Does It Take?
Replacement of an existing garage-to-house door is a half-day job. If the garage wall plasterboard or threshold step is non-compliant, allow another day for those.
DIY or Professional?
Professional. The whole system must be installed per manufacturer data sheet to maintain the FD30 rating. Cutting too much off the bottom voids the certification — the threshold step is usually what catches DIYers out.
Choosing the Right Tradesperson
Use a competent carpenter familiar with fire-door installation. For a thorough job they should also check the garage wall and ceiling for 30-minute fire resistance — a hollow stud-wall to a habitable room is non-compliant. Get the FD30 certification paperwork from the supplier.
UK Regulations
Approved Document Part B requires FD30 between an integral garage and any habitable room. Approved Document Part J requires the 100mm step. The garage wall and ceiling between the garage and the house must achieve 30 minutes' fire resistance (typically 12.5mm plasterboard with taped joints). Self-closers are best practice but not always mandatory for domestic 2-storey dwellings.
Common Problems
- No threshold step: Many older garage doors are flush — water-stained skirting in the house is the giveaway that fuel could flow under.
- Plasterboard ceiling missing: A garage ceiling that's just rafter underside is not 30-minute fire resisting. Insulating and boarding it is part of the upgrade.
- Letterbox in the door: A common DIY error — any letterbox void the certification. There should be no penetrations through the door.
- Wedged open: Homeowners often wedge the garage door open for ventilation. Fit a swing-free hold-open device with smoke detection linkage.
Frequently Asked Questions
Is my existing garage door FD30?
Look for a coloured plug or label in the top edge — Certifire orange, BM TRADA blue, or a CE mark. Most pre-2010 garage doors are not certified. If you can't find a label, assume not.
Do I need a self-closer?
Not legally required in 2-storey domestic dwellings — though it's strongly recommended. Required in flats and HMOs.
How high should the step be?
100mm minimum, measured from the garage floor to the door threshold. This contains spilled petrol or oil from flowing into the house.
Can I have a cat flap in the garage door?
No — any penetration voids the FD30 rating. Fit the cat flap in a non-fire-door elsewhere.
What if the garage was converted to a habitable room?
Then no fire door is needed at that location, but the conversion itself is Building Regs notifiable — Part L (thermal), Part F (ventilation), Part B (escape).
Does the door need a smoke seal?
Brush smoke seals are required to FD30S certification — the "S" denotes smoke seal. Most modern FD30s are sold as FD30S as standard.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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