Selecting Natural Stone Without Being Surprised on Site

The slab you approve and the slab that arrives should be the same slab. Treat each point as a check rather than a rule — the right answer depends on your room, and the value here is in knowing which question to ask before a decision becomes expensive to reverse. This is written from projects rather than from a general principle, which is why it names specific dimensions and specific failure modes rather than staying at the level of advice. Where your own room differs from the assumption behind a point, the point still applies — just adjust the number. Nothing here requires taking our word for it; each point is the kind of thing you can verify yourself on a site visit or ask a contractor to confirm in writing. That verification is usually the difference between advice that gets followed and advice that gets nodded at and ignored. A few of these points contradict what gets repeated as conventional wisdom. Where that happens we say so directly and explain why, because the conventional version is usually true in general and wrong for the specific case it gets applied to.

It is easy to treat this as a minor decision because it does not show up in a rendered image. In practice it is one of the decisions that determines whether the finished room actually works the way it was intended to, independent of how it looks. None of the points below meaningfully change the budget on their own — they change whether the budget you already have is spent on the right things. Getting them right does not cost more; getting them wrong costs a rework later that was never in the original estimate. The right moment to act on any of this is whichever comes first: the design drawing that fixes it, or the trade on site that executes past it. After either, changing course gets progressively more expensive.

Approve the actual slab, not a sample

Natural stone varies enormously within a quarry. A 100mm sample tells you the colour family and nothing about the veining you will live with. Photograph the slab and mark it.

Ask about the block, for book-matching

Book-matched slabs must come from consecutive cuts of the same block. If the supplier cannot confirm that, you are not getting a book match.

Understand the finish before you choose

Polished shows every mark and scratch. Honed hides more and feels better underfoot. Leathered hides the most and is the practical choice for a dark counter.

Plan the joints on the drawing

Where a joint has to fall on a long run, decide it on the elevation rather than letting the fabricator choose on site. It is the difference between a detail and a compromise.

Budget for the wastage

Mitred edges, sink cut-outs and vein matching all increase the slab area needed. A 30-40% allowance over net area is normal and is where stone budgets get missed.