Should I seal an Indian sandstone patio?

It depends on the stone. Lighter, more porous types such as Modak benefit from sealing to resist staining. Grey and Raj Green often look better left to weather. Sealing needs redoing every three to five years, so it is a choice rather than a requirement.

Why does my sandstone patio look different from the samples?

Natural stone varies by batch, block and quarry. We lay from several packs at once and mix them across the patio so the variation reads as character rather than patches of colour.

How thick should the mortar bed be?

Typically 35–50mm of full wet bed over a compacted sub-base, adjusted slab by slab because natural stone varies in thickness. Spot bedding on dabs of mortar is the main cause of rocking and cracked slabs.

Will a sandstone patio go green?

Any shaded, damp surface grows algae, and natural stone is more porous than porcelain. An annual clean in spring keeps it under control, and improving airflow and drainage around the terrace helps more than any chemical.

Is sandstone slippery?

The riven surface gives good natural grip when clean. Slipperiness on natural stone is almost always algae rather than the stone itself, which is why regular cleaning matters on north-facing terraces.

How long does a sandstone patio take to install?

A typical 30–40m² terrace takes around five to eight working days including excavation, sub-base, laying, steps and pointing. We give you a written schedule before starting.

Patios

Sandstone Patios in Guildford

Warm, riven natural stone with genuine colour variation — the material that still looks most at home against Surrey brick and flint.

Get a free quote 07457 401492

Indian sandstone remains the most popular natural stone patio material in Guildford because it is beautiful, affordable and forgiving to walk on. It is a natural product, though, which means shade variation, thickness variation and a genuine need for correct bedding and pointing.

Why natural sandstone

No manufactured product replicates the depth of a riven sandstone surface — the subtle banding, the shifts of grey into buff into rust across a single patio. Against period brickwork in Godalming or a flint wall in Compton, it settles in immediately in a way that a perfectly uniform slab never does.

It is also naturally slip-resistant thanks to its riven face, comfortable underfoot, and available in mixed-size packs that let us lay a random-coursed pattern with real character.

Genuine natural material with unique colour variation
Riven surface gives good natural grip
Excellent value compared with most natural stones
Available in mixed-size packs for random or coursed layouts

Indian sandstone patio installed in Guildford, Surrey

Colours and how they weather

Grey sandstone reads cool and contemporary and silvers slightly with age. Raj Green and Autumn Brown blends carry green, rust and buff together and suit traditional houses. Modak and Rippon buff bring a pink-cream warmth that flatters red brick. Kandla grey and black limestone give the sharpest modern contrast.

All natural stone changes over the first two or three years. Colours mellow, iron in the stone can bloom faintly, and lichen appears on shaded edges. That weathering is the point — if you want a surface that stays exactly as delivered, porcelain is the better choice.

Patterns and layout

Mixed-size packs allow a random pattern with no repeating grid, which is the traditional look and works best on larger terraces. Single-size slabs in coursed or stack bond feel more formal and modern.

We set out every patio from the house line and the main sightline from your rear doors, so full slabs land where they are seen and cuts fall at the edges. Circle features, borders in a contrasting stone and sett-course edges are all options we detail on the survey.

Preparation, bedding and falls

Sandstone is laid on a full wet mortar bed over 100–150mm of compacted MOT Type 1. Because natural stone varies in thickness by several millimetres, each slab is individually bedded and tapped down to the level rather than laid to a fixed screed.

Falls of about 1:80 run away from the house, and the finished surface stays at least 150mm below the damp proof course. Where an existing terrace sits too high against the wall, we lower it or fit a threshold drain — bridging the DPC is how damp problems start.

We prime the back of dense stone where needed and never spot-bed. Hollow bedding is the reason so many patios have that one slab that rocks and cracks in year three.

Jointing, sealing and drainage

Joints are typically 10–15mm on riven stone and pointed with a proper jointing mortar or a slurry-applied compound. Both do the same job: a fully filled, well-compacted joint that keeps water out of the bed.

Sealing is optional and genuinely useful on lighter, more porous stones such as Modak, where it slows staining from barbecues and planters. On grey sandstone we often advise letting the stone weather naturally. A sealer needs reapplying every three to five years, so it is a commitment rather than a one-off.

Where a terrace sits against a lawn or slopes towards the house, we build in a slot drain or channel and take the water to a soakaway.

Maintenance

Brush regularly, wash with warm soapy water, and treat algae in spring with a dedicated patio cleaner rather than bleach. Keep pressure washers on a wide fan at moderate pressure — high pressure erodes the soft riven face and blasts out pointing.

Repointing a section every decade or so is normal on any natural stone terrace, and much easier than people expect.

Recent work

Sandstone Patios projects across Guildford & Surrey

Work completed across Guildford, Godalming, Woking, Farnham, Cranleigh, Haslemere, Shalford, Merrow, Burpham, Ash, Normandy, Ripley and the surrounding Surrey villages.