The most common re-roofing decision on North Wales properties: should you re-roof in reclaimed Penrhyn Blue slate or switch to concrete interlocking tile? An honest comparison.
| Factor | Penrhyn Blue Slate | Concrete Interlocking Tile |
|---|---|---|
| Material cost | High (£35–£60/m²) | Low (£8–£18/m²) |
| Expected lifespan | 80–120+ years | 30–50 years |
| Appearance | Authentic period character | Modern, standardised |
| Conservation area | Usually required | May not be permitted |
| Coastal suitability | Excellent — salt air resistant | Good — surface erodes over time |
| Re-roof cost (semi) | £8,000–£14,000 | £5,500–£9,000 |
Key fact: Properties within the Llandudno Conservation Area are generally required to use matching materials on visible elevations under Conwy County Borough Council conservation-area guidance. Source: Conwy County Borough Council conservation-area guidance
Properties within the Llandudno Conservation Area are generally required to use materials consistent with the original construction on visible elevations. For Victorian and Edwardian properties, this typically means Welsh slate on street-facing slopes. Concrete tile is generally not an acceptable substitute in these designations.
Free survey and honest recommendations based on your property's condition, planning context and budget.
📞 Call 01492 339 101Outside conservation areas, switching from slate to concrete tile is generally permitted development. Within the Llandudno Conservation Area, a material change on visible elevations typically requires planning consent and may not be permitted.
Yes — we carry reclaimed Penrhyn Blue slate in standard and non-standard sizes. For large whole-house re-roofs, we source additional stock before confirming the project.
Yes — modern concrete interlocking tile performs well in coastal conditions when correctly specified. The main coastal-specific consideration is ridge tile fixing: we use mechanical fixings rather than mortar-only on all exposed coastal properties.
Over a 60-year period, the economics of slate versus tile are closer than the upfront cost difference suggests. A concrete tile roof re-installed at year 40 (mid-life for concrete) brings the total 60-year cost closer to the once-only slate installation. On a well-maintained property held for generations, reclaimed Welsh slate is the more economic choice over a 100-year horizon. For properties being sold within 15 years, the calculus is different — the re-roof should protect the property's value during the ownership period, and concrete tile at lower cost achieves this.
When repairing a Welsh slate roof in Llandudno, the material match matters — not just aesthetically but practically. Penrhyn Blue slate has a specific thickness profile, cleavage grain and water absorption characteristic. Substituting Spanish slate or fibre cement in a repair section changes the drainage behaviour of the surrounding tiles and creates a visible mismatch on street-facing elevations that may affect conservation area compliance. We carry reclaimed Penrhyn Blue specifically for repair work on North Wales period properties.
No call-out fees. No obligation. An honest quote from a local roofer who knows Llandudno properties.
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