Topmount and undermount are different jobs
A topmount sink usually covers the cut edge with its rim. An undermount sink leaves the internal edge visible and may require detailed finishing and new support. Changing from one style to another cannot be priced as a simple enlargement without checking the installation.
Confirm the template and cabinet
Provide the sink’s manufacturer template and overall dimensions, plus photos of the cupboard below. A larger bowl can conflict with cabinet walls, waste pipes or drawers. Tap holes may also need to move, and unwanted holes cannot simply be made invisible.
Know when replacement makes more sense
Removing a double sink and filling the original opening usually leaves a visible result. Where the new layout cannot work with the existing hole, a replacement benchtop section may give a better outcome. We explain the likely appearance before quoting the work.
Request a written cutting quote
Send your suburb, photographs, existing and required dimensions, and the appliance or fitting model. We confirm suitability, the scope of finishing, access requirements and the agreed price before booking. Work on legacy engineered stone is considered only within permitted scope and applicable controls.
Related planning information
Questions, answered.
Can a topmount sink opening be used for an undermount sink?
Not automatically. An undermount installation exposes the opening’s edge and needs suitable support and finishing. The sink template, existing hole and cabinet must be assessed together.
What does the quote include?
Your written quote sets out the agreed cutting and finishing. Appliance, gas, electrical, plumbing and cabinet work are separate unless explicitly included.