Can I reuse an existing tap hole for a new mixer?

Use the exact model drawing, not the visible base size

Locate the installation sheet for the new mixer and note its required mounting opening, permitted mounting thickness and fixing arrangement. A broad decorative base does not establish that the shank and fixing will fit your stone. Different models can have different requirements. Send the full model number and drawing with your enquiry, rather than a screenshot showing only the finished appearance.

Establish what is already there without disconnecting it

Photograph the tap from above, including the sink and splashback, and show the fixing area inside the cupboard if accessible. If the tap is still fitted, the base may conceal the actual opening. Do not estimate the hole from the cover diameter or dismantle the fitting to get a measurement. Tell us which dimensions are known and which are concealed; your plumber can coordinate any required removal and confirmation.

Check mounting thickness and access underneath

The fixing must work through the complete mounting build-up, not just the visible edge profile. Show the underside of the stone, any backing, the sink bowl, cabinet rails, clips and existing hoses. There needs to be workable access for the fixing and connections. A model that accepts the hole diameter can still be unsuitable if its fixing cannot reach, sit correctly or be accessed below. Confirm product-specific requirements before committing to the fitting.

Allow room for the handle and everyday use

Check the manufacturer drawing for the tap position and operating movement. Consider the splashback or wall behind it, the sink rim beside it and where the outlet will discharge. A handle that moves backwards may need clearance that the old mixer did not. Pull-out hoses and their operating arrangements also need space underneath. Provide a wide photo of the cupboard as well as a close-up of the existing tap.

Distinguish a matching opening from an enlargement

If the existing hole and mounting arrangement suit the new model, stone cutting may not be required. If a larger opening is specified, suitability for enlargement must be assessed against the material, condition, nearby openings and access. An existing hole cannot be made smaller by drilling. A cover or alternative fitting may be considered, but must suit the product and installation; do not assume the new base will conceal or adequately support an oversized opening.

Moving a tap leaves another decision behind

A new position usually leaves the old hole visible unless a separate agreed solution addresses it. A repair or cover can remain noticeable, and a new hole also needs a suitable relationship to the sink, stone edges and support below. Before choosing a new location, send both the existing and proposed positions with the product drawing. Ask what the finished result will look like at the old opening, rather than considering only the new mixer.

Coordinate the plumber and stone alteration scope

Ask your plumber to confirm the selected mixer and plumbing requirements. If stone work is necessary, obtain a separate written scope stating the intended opening, material assessment, access and finishing. Confirm who removes and reinstalls the tap and when the opening will be measured. This avoids a visit being arranged around a concealed dimension or an appliance that has not yet been selected. This guide is for planning a professional service, rather than instructions for drilling stone.

What to send with a tap-hole enquiry

Send your suburb and postcode, the existing tap and sink photos, an accessible underside photo, the new model number and its installation sheet. Include any confirmed opening measurement, the mounting thickness if known and whether the tap is still connected. Tell us whether you want to keep the same position or add another fitting. The quote can then address a verified change rather than a nominal hole size.

Manufacturer reference

Franke: installation instructions and tap fit questions

Questions, answered.