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Install air bricks.
Underfloor ventilation that prevents damp in suspended timber floors — single bricks or telescopic vents.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any damp proofer starts on air Bricks & Ventilation Bricks.
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Air bricks paved over
Modern paving raised above DPC blocks air bricks. Common in pre-1980 properties. Periscope vents fix.
Internal vents missing
Some homes have external air bricks but missing internal vent grilles. Air doesn't reach sub-floor.
Insulation blocking
Insulation pressed against external wall blocks air brick from inside. Maintain gap.
Bird/rodent entry
Cheap air bricks let pests in. Fit anti-bird mesh or use brick with built-in grille.
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
Replace single air brickSame opening
£40–£120
Install new air brickNew opening cut
£80–£250
Periscope vent (vertical reach)Y-shape inside cavity
£80–£200
Clay air brick (each)Traditional finish
£15–£40
Plastic air brick (each)Modern
£5–£15
Stainless steel air brickPremium
£20–£60
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Damp Proofer briefing.
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Damp Proofer explained
Air bricks ventilate cavity walls and crawl spaces. Without adequate airflow, damp builds up and timber rots. Expect to pay £40–£250 per UK air brick for installation or replacement.
What Does the Work Invovle?
Mortar joint cut out for the existing brick. New air brick (clay, plastic, or stainless steel) inserted. Mortar repointed around. Plastic Periscope vents (Y-shaped vent that reaches into the cavity from a brick course higher up) used where ground level rises above natural airbrick height. Periodic clearing of debris and vegetation.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Replace single air brick | 40 | 120 | Same opening |
| Install new air brick | 80 | 250 | New opening cut |
| Periscope vent (vertical reach) | 80 | 200 | Y-shape inside cavity |
| Clay air brick (each) | 15 | 40 | Traditional finish |
| Plastic air brick (each) | 5 | 15 | Modern |
| Stainless steel air brick | 20 | 60 | Premium |
| Whole-house air brick refurbishment | 400 | 1,800 | 20+ bricks |
How Long Does It Take?
Single replacement: 1 hour. Multiple installs: 1 day. Periscope vent: 2–3 hours each.
DIY or Professional?
DIY-able for confident DIYer with masonry experience. Most homeowners hire bricklayer or general builder.
Choosing the Right Tradesperson
Bricklayer or general builder. For specific damp remediation, PCA-qualified specialist.
UK Regulations
Building Regs Part F (ventilation rates). 1 air brick per 1.5m of external wall recommended. Listed buildings need consent.
Common Problems
- Air bricks paved over: Modern paving raised above DPC blocks air bricks. Common in pre-1980 properties. Periscope vents fix.
- Internal vents missing: Some homes have external air bricks but missing internal vent grilles. Air doesn't reach sub-floor.
- Insulation blocking: Insulation pressed against external wall blocks air brick from inside. Maintain gap.
- Bird/rodent entry: Cheap air bricks let pests in. Fit anti-bird mesh or use brick with built-in grille.
Frequently Asked Questions
How many air bricks do I need?
Building Regs guide: one per 1.5m of external wall on each elevation. Most pre-1980 houses are under-vented by current standards.
What's a periscope vent?
Y-shaped plastic vent that connects an air brick (high on the wall, above paving) to the cavity (below paving). Allows ventilation despite raised external ground level.
Clay or plastic air bricks?
Clay: traditional look, suits heritage. Plastic: cheap, easy install. Both equally effective ventilation.
Are air bricks just for crawl spaces?
No — cavity wall homes have air bricks at multiple levels for cavity ventilation. Modern fully-filled cavities (insulation) often have different ventilation strategy.
Will air bricks let cold air in?
Yes — small amount. Trade-off: ventilation prevents damp. Insulated floor above the crawlspace minimises heat loss.
Should I block air bricks in winter?
No — ventilation needed year-round. Blocking causes condensation, damp, rot. Modern guidance is continuous ventilation.
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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