Contractors are about to begin work on new public toilet facilities at the Mayfield Domain.

The old concrete building is to be demolished and replaced with a modern four-cubicle toilet block, and the project should be complete in about a month.

Temporary portaloos are onsite at the entrance to the domain, off Arundel Rakaia Gorge Road, so visitors and travellers will still be able to make a pit stop.

Security fences are being put up around the old toilets to create a safe work zone.