Which valve needs attention?
An internal stopcock, an appliance isolation valve and an external boundary stop tap are not the same thing. Describe the location and what happens when it is operated. Do not force a seized valve: the fitting or connected pipe can be damaged.
How will the supply be isolated?
A replacement needs a safe, agreed way to stop the upstream supply. Shared supplies, apartment buildings and unclear boundary arrangements may need the owner, managing agent or water supplier involved. Responsibility for external assets must be established before work is accepted.
Make future access practical
A valve hidden behind fixed cabinetry may need an access opening or a different position. We can discuss suitable accessible arrangements, with cabinet changes and making good identified separately. Tell us if a business or occupied building has restrictions on water shutdown times.

