Flagstones – Llandraw Sandstone (External)

Our premium quality natural sandstone flooring comes from our own quarry at the foot of the Black Mountains. Grey-green in colour with some russet tones, our Llandraw flagstones are hand-split to create a traditional riven surface.


These traditional sandstone flags can be used outdoors for patio slabs, courtyards or garden paths.

The Llandraw flagstones have sawn edges and are hand split for a natural riven surface. Depending on the various seams in the quarry, they vary in thickness from 30mm – 70mm. These flagstones are hard wearing, beautifully finished and widely versatile. Due to this being a rare commodity lead times will be longer, please inquire about current lead times.

What sizes are available?

We usually supply our Llandraw Sandstone Flagstones in one or two widths, with random running lengths to keep wastage to a minimum. However since this stone comes from our own quarry we can be flexible with sizes: you can request specific measurements, minimum lengths or widths, or completely random sizes to create a truly traditional flagstone floor.

We have an in-house cutting service for all of our products; please call or email us to discuss your requirements, and we’ll give you quote and a lead time.

Different uses for flagstones in the house and garden

Llandraw sandstone flagstones are suitable for both interior and exterior flooring. Indoors, these flagstones work really well with underfloor heating, spreading and retaining the warmth throughout the stones. Outdoors, they are perfect for courtyard gardens, patios, pathways, seating areas and stepping stones.

Laying the flagstones

Outdoors, these flagstones can be laid on a sand and cement bed. Ensure the bed is level, and if needed use a sub-base. Spot bedding is not recommended as its makes the flagstones unstable and susceptible to fracturing.

Indoors, the flagstones can also be laid on a sand and cement base (depending what surface they’re going on to), or you can use a flexible adhesive.

Joint widths are a personal decision, but a 12mm gap is standard. We recommend Jointex Easy as a fixing mortar. It’s ready mixed, easy to use, doesn’t stain the flagstones and creates a very neat professional finish. It is permanently water permeable, resistant to high pressure cleaners and helps prevents weeds. Just empty the tub onto wet flagstones and work it into the joints, making sure they are firm and compact; then wait for it to dry (see the Jointex Easy Data Sheet for full details).

Looking after the flagstones

Personally we don’t seal flagstones for outdoor use, because we think they improve with weathering. However you can seal them if you prefer.

Indoors we would definitely recommend sealing flagstones, to protect them from grease marks and household staining. It is essential to use a sealant specially made for natural stone, and we sell a range of high quality sealants for you to choose from. Some of the flagstones are more porous than others so the number of coats required will differ from one type of flagstone to another.

Should your flagstones become stained with oil, grease or ingrained dirt we recommend LTP Grimex. This is a special cleaner for indoor or outdoor areas, and brings the stone up a treat.

Products to match

Stone lifted from our Llandraw Quarry splits naturally into layers. As well as our traditional flagstones we cut and hand-finish this stone into crazy paving, cobbles, lintels, cills, steps, edging, wall coping and pier caps. All products are available in standard sizes or can be bespoke cut to your spec.

Llandraw sandstone is identical in colour and texture to the building stone produced a few miles down the road at our Tybubach Quarry. The latter is ideal for building and walling, and would create a perfect match.

We also source a range of flagstones, cobblestones, lintels and cills from responsible suppliers throughout the world, to provide our customers with a wider choice of colour, finish and prices.

For external landscaping we produce a range of rocks and stones from all of our quarries, with a choice of BMQ grey-green sandstone (to match the Llandraw sandstone), plus Callow red sandstone, and Cornish silver-grey granite. These are available in various sizes from small rockery stones to 12 tonne boulders.

An important note about natural stone

Whilst we have done our utmost to ensure the stone and colours displayed on our website are accurate, they are to be used as a guide only. Because stone is a natural product, texture and colour will vary from piece to piece. As we work through the quarry, seams will yield slightly different coloured and shaped stones.

The way in which flagstones are laid, and the amount, colour and type of grout used will all impact the look of the finished design. Please bear this in mind when ordering stone samples and products.


Price per Sq metre
From £100.00 ex VAT
From £120.00 inc VAT