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Coat & protect render.
Existing render sealed with silicone weather coating — stops water ingress, restores look, 15 years of life.
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Costs, timelines, pitfalls and the right questions to ask before any weather coatings starts on wall Coating & Render Protection.
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Hiring a weather coatings, without the regret.
Four moves that separate a smooth job from a nightmare.
Cheap coating peels
Bargain coatings fail in 3-5 years. Quality 15-25 years.
Damp trapped
Non-breathable on solid walls causes damp. Breathable essential.
Cracks ignored
Coat over without fixing. Re-cracks.
Wrong substrate
Pebble dash needs specific coating.
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
Masonry paint repaint (per m²)Standard
£15–£40/m²
Specialist wall coating (per m²)15-25 year
£30–£80/m²
Semi-detached coatingWhole house
£1.5k–£4k
Detached coatingLarger
£2.5k–£6k
Insulating coatingPer m² premium
£40–£100/m²
External wall insulation + coatingPer m² full system
£80–£200/m²
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Weather Coatings briefing.
Infographic
Weather Coatings quick-view
Video guide
Weather Coatings explained
Wall coating protects exterior walls from weather, damp, and decay. Premium systems include insulation. Expect to pay £1,500–£6,000 for UK wall coating on average semi.
What Does the Work Involve?
Specialist applicator. Scaffolding. Pressure-wash and prepare walls. Apply primer/stabiliser. Two coats of specialist coating (silicone, smartwall, microporous). Cracks filled. 25-year guarantees common. 3-7 days work.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Masonry paint repaint (per m²) | 15 | 40 | Standard |
| Specialist wall coating (per m²) | 30 | 80 | 15-25 year |
| Semi-detached coating | 1,500 | 4,000 | Whole house |
| Detached coating | 2,500 | 6,000 | Larger |
| Insulating coating | 40 | 100 | Per m² premium |
| External wall insulation + coating | 80 | 200 | Per m² full system |
| Scaffolding (1 week) | 500 | 1,500 | Often included |
How Long Does It Take?
Standard coating: 3-5 days. Premium with prep: 5-7 days.
DIY or Professional?
Masonry paint DIY possible. Specialist coating: applicator-trained installer.
Choosing the Right Tradesperson
BBA-certified system. Specialist applicator. Insurance-backed guarantee. NABMA (National Association of Building Maintenance Approved).
UK Regulations
Building Regs Part C (weather). Listed buildings: consent. Conservation areas: planning advice.
Common Problems
- Cheap coating peels: Bargain coatings fail in 3-5 years. Quality 15-25 years.
- Damp trapped: Non-breathable on solid walls causes damp. Breathable essential.
- Cracks ignored: Coat over without fixing. Re-cracks.
- Wrong substrate: Pebble dash needs specific coating.
Frequently Asked Questions
Masonry paint or wall coating?
Paint: 5-10 years. Coating: 15-25 years guaranteed. Coating cheaper long-term.
BBA certification essential?
Yes — independently tested. Guarantees mean something.
Insulating coating worth it?
Slim insulation gain. Better to upgrade with EWI £80-£200/m² for real thermal improvement.
Breathable on solid walls?
Essential — solid walls need to breathe. Silicone or microporous systems.
How long does coating last?
Quality: 15-25 years. Insurance-backed guarantees.
Best UK brands?
Wethertex, K-Rend, Sandtex, Weatherwall. BBA-certified preferred.
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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