1. Start with the basin arrangement
Identify each bowl position, tap position, waste fitting and the clearance needed around them. For an undermount basin, provide the selected sink model and cut-out information. For an integrated stone bowl, agree the bowl geometry, slopes and drain interface in the drawing.
2. Define visible edges and exposed faces
Mark which front, side, backsplash and apron faces will remain visible. Edge thickness may be a solid stone section or an assembled detail; the drawing should show the intended construction instead of relying on a visual reference.
3. Coordinate the support
A floating vanity needs a support and fixing strategy coordinated with the wall construction. A cabinet-supported top needs confirmed cabinet dimensions, level bearing surfaces, drawer clearances and exposed ends. The project team should approve the structural arrangement for the actual load and site conditions.
4. Place seams deliberately
Large or complex assemblies may need joints. Review slab size, transport limits, bowl construction, vein direction and installation access before deciding seam locations. Record the agreed joint positions on the approved drawing.
5. Separate the supply scope
List stone tops, bowls, aprons, backsplashes, returns and cabinetry separately. Identify taps, wastes, brackets, sealants and installation work supplied by others so the quotation and site responsibilities are clear.