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Install slate roofing.
Welsh, Spanish or Brazilian slate — supplied, batten-fixed and ridge-detailed by a specialist slater.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any roofer starts on slate Roofing.
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Wrong slate for the climate
Cheap Chinese slate doesn't survive UK frost cycles. Welsh or quality Spanish is the durable choice.
Iron nails corroding
Steel nails in slate corrode and slates slip. Always use copper or aluminium nails.
Inadequate head lap
Slates need 75–100mm head lap. Cheap installs reduce this to save material — water penetrates.
Lead theft on slate roofs
Lead valleys and flashings are theft target. Aluminium or terne-coated stainless are theft-resistant alternatives.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Spanish slate per m²Most affordable natural slate
£40–£80/m²
Welsh slate per m²UK premium heritage slate
£120–£250/m²
Brazilian/Chinese slate per m²Budget option
£30–£60/m²
Installation labour per m²Skilled work
£40–£90/m²
Standard terraced slate re-roof50–70 m²
£9k–£18k
Semi-detached slate re-roof80–120 m²
£14k–£28k
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
Semi-detached full re-roof · week by week
Typical
4 phases · 3 wk
4 phases · 3 wk
W1
W2
W3
Scaffold erection
Strip + felt + battens
Tile + ridge + verge
Flashings + snags
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
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Natural slate is the longest-lasting UK roof material — quality Welsh slate lasts 100–150 years. Heritage and listed properties usually require slate. Expect to pay £80–£250 per m² fitted in the UK depending on slate grade.
What Does the Work Involve?
Slates are laid in horizontal courses with side and head laps for waterproofing. Each slate is fixed with two copper or aluminium nails through pre-drilled holes. Heads of slates above are positioned to cover the nails of the slate below. Verges, hips, and ridges are formed with specific slate-and-mortar or zinc/lead detailing. Skill required is high — slate is hand-graded, sized, and fitted.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Spanish slate per m² | 40 | 80 | Most affordable natural slate |
| Welsh slate per m² | 120 | 250 | UK premium heritage slate |
| Brazilian/Chinese slate per m² | 30 | 60 | Budget option |
| Installation labour per m² | 40 | 90 | Skilled work |
| Standard terraced slate re-roof | 9,000 | 18,000 | 50–70 m² |
| Semi-detached slate re-roof | 14,000 | 28,000 | 80–120 m² |
| Heritage slate replacement (listed) | 20,000 | 50,000+ | Welsh slate, salvage |
How Long Does It Take?
Terraced slate re-roof: 7–10 days. Semi-detached: 10–14 days. Heritage repair: variable, often weeks.
DIY or Professional?
Professional only. Slate work is the most skilled trade in roofing — requires apprenticed roofers. NFRC heritage slate certification is the UK standard.
Choosing the Right Tradesperson
NFRC heritage slate specialist. SPAB-accredited for listed buildings. Confirm slate grade and source — quality Welsh slate from Penrhyn (Bangor) or Ffestiniog quarries; quality Spanish slate from Galicia. Avoid no-grade Chinese imports for premium roofs.
UK Regulations
Listed buildings require like-for-like slate replacement. Conservation areas may require slate where present. Building Regs Part L thermal upgrade applies to re-roofs.
Common Problems
- Wrong slate for the climate: Cheap Chinese slate doesn't survive UK frost cycles. Welsh or quality Spanish is the durable choice.
- Iron nails corroding: Steel nails in slate corrode and slates slip. Always use copper or aluminium nails.
- Inadequate head lap: Slates need 75–100mm head lap. Cheap installs reduce this to save material — water penetrates.
- Lead theft on slate roofs: Lead valleys and flashings are theft target. Aluminium or terne-coated stainless are theft-resistant alternatives.
Frequently Asked Questions
Welsh or Spanish slate?
Welsh: most expensive (£120–£250/m²), 100–150 year life, listed building standard. Spanish: mid-range (£40–£80/m²), 80–100 year life, excellent value.
Can I salvage and reuse old slates?
Yes if undamaged and from a quality source. Salvage slate is sold by specialists (CSC Slate, Burlington Slate). Reused with new fixings.
How long does a slate roof last?
Welsh: 100–150 years. Spanish: 80–100 years. Brazilian: 30–60. Chinese: 25–50 (highly variable).
Slate or tile for a heritage home?
If original was slate and the property is listed/in conservation area: slate is required. Modern equivalent: synthetic slate (cement fibre or fibre cement, 40–60 year life) is sometimes accepted.
Why are slates falling off?
"Nail sickness" — steel or iron nails rust and fail. Re-fixing with copper or aluminium nails extends roof life 50+ years. Whole re-slate often more cost-effective.
Can I add solar to a slate roof?
Yes — but use slate-specific roof hooks (Schletter, K2). Specialist installation required. Expect 15–25% premium over tile-roof solar install.
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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