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01 · Ask
Repaint or full coating system?
Refresh existing paint, or apply a 15-year coating? Describe the house and the AI tells you which suits the substrate.
Install render & insulation.
External wall insulation under render — combined upgrade for thermal performance and weatherproofing.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Hire a weather-coating applicator. Primer, topcoat, dry weather.
Read the brief on substrates, breathability and weather conditions — then let Three local applicators quote.
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02 · Read the brief
Walk in informed
Silicone vs acrylic, breathability ratings, primer requirements, weather windows, BBA-certified systems. Know what 'guaranteed' means.
60 seconds
03 · Compare
Compare 3 applicator quotes
Three local applicators quote on the same spec — coating system, prep, scaffold, guarantee — so you compare cleanly.
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Top tips
Hiring a weather coatings, without the regret.
Four moves that separate a smooth job from a nightmare.
Test the substrate first.
Cement render, pebbledash, brick — different surfaces need different coatings. A proper applicator tests adhesion before quoting.
Insist on a primer + topcoat system.
Skipping the primer halves the lifespan. A coating system (primer + 2-coat topcoat) lasts 15+ years; topcoat-only fails in 5–7.
Don't apply in wrong weather.
Most coatings need >5°C and dry for 24 hours either side. Applicators who push on in November or April are setting up failure.
Check the breathability rating.
Solid walls need breathable coatings (vapour-permeable) — silicone-based, not acrylic. Sealing solid walls traps damp.
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)
£18–£40/m²
Silicone weather coating (per m²)
£35–£70/m²
Pebbledash repaint (per m²)
£25–£50/m²
Whole-house weather coatingSemi-detached
£3.5k–£9k
Render repair + coating
£4k–£12k
Scaffold hire (3 weeks)
£800–£2k
!
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
External rendering and wall insulation — major thermal upgrade for solid-wall homes. Expect to pay £3,500–£15,000 for UK render or EWI on average semi.
What Does the Work Involve?
Specialist installer. Scaffolding. Wall prep. Insulation board fitted (EPS, PIR, mineral wool). Base coat with mesh. Top coat render (silicone, silicate, mineral). Or render-only without insulation. 3-4 weeks.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Render only (per m²) | 40 | 100 | No insulation |
| External wall insulation EWI (per m²) | 80 | 200 | Insulated |
| Semi-detached EWI | 8,000 | 15,000 | Full house |
| Detached EWI | 12,000 | 22,000+ | Larger |
| Render-only semi | 3,500 | 8,000 | No thermal upgrade |
| K-Rend silicone render | 60 | 120 | Premium per m² |
| Monocouche render (per m²) | 30 | 70 | Coloured through |
UK Regulations
Building Regs Part L (thermal). Part B (fire — limited combustibles 18m+). PAS 2030/2035 for retrofit. BUS grant £7,500 for heat pump (combined with insulation).
Frequently Asked Questions
Render or EWI?
EWI adds insulation. Render-only cosmetic. EWI saves £200-£500/year heating, ROI 8-15 years.
Best render system?
Silicone (K-Rend): self-cleaning, breathable. Monocouche: coloured through, scratched finish. Mineral: traditional.
Solid wall house essential?
EWI most beneficial for solid wall pre-1930s. EPC F/G can become C/D.
ECO4 / GBIS grant?
If qualifying income/benefits: full funding possible. SUSPEND check eligibility.
How long does render last?
Quality: 25-30 years. K-Rend, silicone: lifetime guarantees.
Planning permission?
Replacement: permitted development usually. Listed/conservation: consent required.
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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