Distinguish material thickness from the visible edge
Ask how the proposed edge will be made and whether its apparent depth matches the thickness of the main surface. Record the answer on the quotation and drawing.
On a replacement, check how a changed height would meet the sink, hob, existing tiles and surrounding units. Ask the installer to assess the junctions rather than assuming a thicker or thinner option drops straight into place.
Discuss joints before choosing a pattern
Ask where joints are proposed and how a directional pattern will meet across them. A large photographic view can help explain your preference, but it does not establish what a particular slab and layout will allow.
If the design includes a waterfall end or a splashback, ask to see how the pattern and edge detail will meet at that change of plane. Make sure the agreed treatment is included in the price.
Leave support limits to the product specification
For a breakfast bar, island or opening, ask the fabricator to confirm the proposed support and the relevant manufacturer requirements. This guide deliberately gives no universal overhang dimension.
Keep those decisions with the kitchen plan so a cabinet designer or installer can coordinate them. Do not remove supports or order a new base arrangement on the strength of an inspiration photograph.
Planning a breakfast bar or waterfall end? Include it in your kitchen island enquiry with the current layout.
Common questions
Can I choose any edge on any material?
Ask the fabricator to confirm the proposed edge for the exact product, thickness and layout. A photograph of another kitchen is not a technical specification.