Lay a slate patio.

Slate is the most distinctive natural-stone patio you can lay in a UK garden — deep blue-blacks, plum-purples, and slate greens that intensify when wet. It's harder than sandstone, slightly softer than granite, and has a natural riven texture that grips well underfoot. This guide covers what slate costs installed in 2026, the colour and origin options, and the install detail that prevents the one real failure mode: splitting along bedding planes.

Brazilian black, Indian copper, Chinese rustic, and Welsh blue-grey are the most common UK options. Welsh is the most expensive (and most prized), Indian/Brazilian the most affordable.

What Does the Work Involve?

• Excavation to 200 mm and standard sub-base prep.
• 100 mm compacted MOT Type 1 sub-base.
• Full mortar bed, semi-dry mix.
• Careful slab layout — slate's natural variation means each piece is unique.
• Slabs laid to a 1:80 fall.
• Resin or sand-cement jointing (resin recommended — slate's bedding planes don't like rigid joints).
• Optional enhancer to lift the colour (especially nice on blacks and greens).

Typical Costs

Welsh slate doubles the per-m² cost but is increasingly hard to source — most modern Welsh slate goes into roofing rather than paving.

How Long Does It Take?

• 15 m² patio: 3–4 days.
• 20 m² with cuts and edging: 4–5 days.
• Enhancer applied 1–2 weeks after pointing once fully dry.

DIY or Professional?

Slate is a moderate-difficulty material. The big risk is cutting — slate cleaves along its bedding planes, so badly aimed cuts cause "stepped" breaks that are hard to recover from. Hire someone with slate experience specifically; sandstone installers don't always have the cutting technique.

Choosing the Right Tradesperson

• Ask specifically about slate experience — request photos of slate jobs.
• Confirm they use a diamond wet saw for cutting (chop-saws chip slate).
• Check their jointing recommendation — flexible resin works far better than rigid mortar.
• Ask about enhancer products — some sealers darken slate permanently in a way you may not want.
• Get warranty in writing — 5+ years for the install, lifetime for the stone itself (slate is geologically ancient).

UK Regulations

• Standard patio planning rules: 5 m²+ impermeable surface in a front garden needs drainage.
• Welsh slate from listed quarries may have provenance documentation — keep it for property records.

Common Problems

• Splitting along bedding planes — natural cleavage planes can open up if the slab is bent during handling or laid on uneven mortar.
• White scuff lines — drag-marks from handling. They polish out with a damp cloth and time.
• Iron staining — some slates have natural iron deposits that rust to orange. Buy from a reputable supplier.
• Slippery polished surface — only an issue with smooth-honed slate. Riven natural cleft is grippy.
• Colour fade — UV bleaches slate over decades. An enhancer or sealer slows this dramatically.

Frequently Asked Questions