Ordering natural stone is not like ordering paint. The colour you fall for on a sample board may not be the colour that arrives on a pallet six weeks later, and a finish that looked beautifully soft under showroom spotlights can read quite differently in a north-facing kitchen. None of that is a disaster if you ask the right questions at the start. These ten cover the points that most often lead to delays, extra cost or a floor you never quite warm to.
Where has the stone come from, and who is selling it?
Start with origin. Not because imported stone is a problem, but because provenance tells you how much control your supplier has. A quarry owner or direct importer usually knows what is in the next container. A merchant buying from a wholesaler may not.
Ask which quarry or region the material comes from, and which family it belongs to: limestone, sandstone, marble, granite, slate, quartzite or travertine. Trade names are marketing, not geology, and the difference matters. A stone sold as marble may be a limestone that etches when lemon juice lands on it, and a "quartzite" can be softer than the word suggests. Ask for the technical data sheet and read the water absorption figure alongside any abrasion or slip-resistance classification. If the stone is going on a bathroom floor or into a commercial space, that data is not optional.
What finish are you actually being quoted?
Finish affects slip resistance, maintenance and price, so get it specified in writing. Honed, polished, brushed, sandblasted, bush-hammered, flame-textured, split-faced and tumbled all behave differently underfoot and all show marks differently. Polished marble in a hallway is a very different proposition from the same stone honed.
Ask where the finish is applied — at the quarry, in the supplier's workshop, or on site — and whether edges are machined, hand-finished or left as sawn. Check whether the stone arrives pre-sealed or needs sealing after installation, and whether the supplier's recommendation is compatible with the sealant your fitter prefers. Two products that fight each other can leave a patchy finish that is very hard to undo.
A note on samples
A 100 mm sample square is a colour reference, not a finish reference. If texture matters to you, ask for an offcut big enough to hold, so you can feel the surface and watch how it responds to light through the day.
Thickness, sizing and tolerance
Nominal sizes are not actual sizes. A tile described as 20 mm thick may arrive at 18 mm, and a "600 x 300" can be a few millimetres out in either direction. That is normal in natural stone, but it has consequences for joints, thresholds and the height of your finished floor.
- Calibrated or not? Calibrated stone has been machined to a consistent thickness, which speeds up laying and helps where stone meets a different floor covering.
- What tolerance do they work to? Ask for a figure, not an assurance.
- Are cut edges square? This matters for butt joints and mitred returns.
- Who measures? If the supplier cuts to size, find out who carries the risk if a measurement is wrong.
- How much does it weigh? Relevant if the stone is going upstairs, onto a wall, or through a narrow side return.
Can I see the actual batch?
Batch variation is a feature of natural stone, not a fault. The crate in the warehouse will not match the sample in your hand exactly, and it may not match a crate delivered six months later if you run short.
Ask to view the slabs or tiles you are buying, in daylight, before you pay. If you cannot get to the yard, ask for photographs of the actual bundle with a tape measure and a colour card in shot. Then request that the batch is reserved against your order and that the batch reference appears on the paperwork. For a large area, buy around ten per cent extra from the same batch and keep it — you cannot match it later.
Lead times, delivery and access
Get dates in writing, and be clear about what triggers them. Stone held in a UK warehouse may ship in days; a special order cut to size can take several weeks, and cutting usually starts once the order is confirmed.
Then talk about the delivery itself. Most suppliers deliver kerbside on a tail-lift vehicle, which means the pallet is left at the edge of the property. Ask about vehicle size, whether a pallet truck will be available, and how the stone is packed. Crates and A-frames are heavy, so plan for help. Book your fitter after the stone has landed, not before, and inspect the delivery before signing. Count the pieces, check for chips and cracks, and compare crates against each other for shade. Photograph anything that concerns you and note it on the delivery paperwork.
Returns, replacements and the small print
Natural stone is often sold as non-returnable, particularly once it has been cut, sealed or ordered specially. That is a reasonable position for a supplier to take, but you should know exactly where you stand before money changes hands.
Ask what can be returned and in what condition — usually unopened crates with all packaging intact. Ask how long you have, who pays carriage in both directions, and whether a restocking charge applies. Then ask what happens if a piece arrives damaged or a shade is wrong: is it replaced from the same batch, and what if that batch has sold out? If the answers matter to your project, have them confirmed by email rather than over the phone.
The ten questions, on one page
- Which quarry or region is this stone from, and what type is it geologically?
- Can I see the technical data sheet — absorption, abrasion, slip resistance?
- Exactly which finish is quoted, and where is it applied?
- Is the stone calibrated, and what thickness tolerance should I expect?
- Can I view and reserve the actual batch before ordering?
- What is the lead time, and does cutting to size change it?
- How is it delivered, and will the driver bring it inside?
- What is the returns policy on full crates and on cut material?
- What happens if a piece arrives damaged or the shade is wrong?
- Which details will appear on the order confirmation — batch, finish, sizes, quantities?
Before you pay the deposit
Read the order confirmation properly. The batch reference, finish, nominal and actual sizes, quantities including your overage, lead time, delivery terms and returns policy should all be on it. If something is missing, ask for it in writing before you commit.
Then keep a spare tile or two somewhere dry, with the batch reference written on the back in pencil. If you ever need a repair, a matching piece from the same batch is worth far more than the discount you might have haggled for.Photo: manfredrichter / Pixabay
