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Install air bricks.
Underfloor ventilation for suspended timber floors — stops damp, rot and musty smells.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Four moves that separate a smooth job from a nightmare.
Blocked air bricks
— leaves, soil, render. Annual clear-out.
Too few air bricks
— common in older houses. Add more.
Damp in floor void
— usually inadequate ventilation.
Cavity sleeve missing
— water bridges into wall.
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
Single air brick installCut and fit
£50–£140
Air brick + cavity sleeveFor cavity walls
£80–£200
Premium ventilator grilleDecorative finish
£30–£120
Multiple air bricks (4–8 brick install)Bulk pricing
£400–£1.2k
Surveying/diagnosisIf damp suspected
£100–£400
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Quote spread is typically ± 18% — always get 3 quotes.
At a glance
InfographicThe Bricklayer briefing.
Infographic
Bricklayer quick-view
Air bricks are perforated bricks installed in external walls below floor level — providing ventilation to the void under suspended timber floors. Adequate ventilation prevents damp and rot. Insufficient air bricks (or blocked ones) are a common cause of UK damp problems. This guide covers what air brick installation costs in 2026, how many you need, and where they go.
Most pre-1960 UK houses with suspended timber floors need air bricks. Modern solid floors don't.
What Does the Work Involve?
- Survey of existing air bricks and ventilation.
- Calculation of required ventilation area.
- Position selection (regular spacing along walls).
- Cutting out existing brick.
- Air brick installed with appropriate fittings.
- Sleeving where needed (through cavity wall).
- Internal cover/grille fitted.
How Many Air Bricks?
- One per 1.5–2 m of external wall.
- Distributed across opposite walls for cross-flow.
- Building Regs spec depending on house age and floor type.
Typical Costs
| Item | Low £ | High £ | Notes |
|---|---|---|---|
| Single air brick install | 50 | 140 | Cut and fit |
| Air brick + cavity sleeve | 80 | 200 | For cavity walls |
| Premium ventilator grille | 30 | 120 | Decorative finish |
| Multiple air bricks (4–8 brick install) | 400 | 1,200 | Bulk pricing |
| Surveying/diagnosis | 100 | 400 | If damp suspected |
How Long Does It Take?
- Single brick: 1–2 hours.
- Whole house ventilation upgrade: 1–2 days.
DIY or Professional?
Cutting through external walls is achievable for capable DIYers. For cavity walls, cavity sleeves matter — easier to hire.
Choosing the Right Tradesperson
- Discuss survey first if damp suspected.
- Confirm cavity sleeve detail.
- Air brick type — clay or plastic.
- External and internal grille style.
UK Regulations
- Building Regs Approved Document C: ventilation requirements.
- Listed properties: heritage-matching grilles.
Common Problems
- Blocked air bricks — leaves, soil, render. Annual clear-out.
- Too few air bricks — common in older houses. Add more.
- Damp in floor void — usually inadequate ventilation.
- Cavity sleeve missing — water bridges into wall.
- Cold draughts inside — air bricks correctly working; insulate floor separately.
Frequently Asked Questions
How do I know if I need more air bricks?
Damp in floor void, musty smell from underfloor area, rot in timbers. Survey confirms.
Will air bricks make house colder?
Slightly — floor void is colder than outside. Insulate the floor itself rather than block air bricks.
Should I block them in winter?
No — damp damage costs more than the heat loss.
Can I install them myself?
Yes for solid walls — cutting and fitting is straightforward. Cavity walls need sleeve detail.
How long do air bricks last?
50–100 years. Plastic ones may shorter due to UV; clay almost permanent.
What about modern airtight homes?
Modern solid floor construction doesn't need air bricks. Older suspended-floor properties do.
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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