Outside Tap Installation London — From £149

Outside tap installation in London costs £149–£280 depending on the tap type and how far the installation point is from the existing cold water supply. A standard brass bib tap with double check valve, isolation valve and wall plate — installed close to an existing kitchen cold supply — costs £149–£180 fully installed. A frost-proof tap (which automatically drains when turned off, preventing freeze damage in winter) costs £180–£220. If the supply pipe needs to run through a long external wall or beneath flooring to reach the installation point, additional labour adds £50–£100. All our installations include the mandatory double check valve required by the Water Supply (Water Fittings) Regulations 1999.

You do not need planning permission to install an outside tap. However, under the Water Supply (Water Fittings) Regulations 1999, all outside taps must be fitted with a double check valve (backflow prevention device) to prevent contaminated garden water from siphoning back into the mains supply. This is a legal requirement — not just best practice. If you live in a listed building or a property within a conservation area, check with your local council whether any external works (such as drilling through a façade) require listed building consent, though in practice this is rarely required for a single tap.

In most London terraced and semi-detached houses, the outside tap is connected to the kitchen cold water supply pipe — the pipe that feeds the kitchen sink cold tap directly from the mains. This is the most accessible point and keeps the run short. We fit a T-piece and isolation valve on this supply, then run a 15mm copper or plastic pipe through the external wall to the tap. In flats, we typically connect to the cold supply serving the kitchen or bathroom, depending on which wall is external. We assess the best connection point during the visit and confirm the route before drilling.

For London properties, a frost-proof tap is worth the extra £30–£40. A standard bib tap leaves water in the pipe between the isolation valve and the tap itself — this short section can freeze and burst during London's occasional hard frosts (typically a few nights per year below -3°C). A frost-proof tap (also called a self-draining or anti-frost tap) incorporates a long spindle that shuts off the water inside the heated part of the wall, letting the external section drain automatically. If you choose a standard tap, isolate and drain it every October by turning the isolation valve off and opening the tap to release water from the external section.

Yes, but it depends on your lease and building permissions. Ground-floor flats with direct garden access can typically have an outside tap installed on the external wall — but you should check your lease first, as some freeholders or management companies require written consent before any external works. Upper-floor flats without a private garden generally cannot have a traditional outside tap, but we can install a utility tap or hose connection point inside a utility room or on a balcony connected to the cold supply. Contact us and describe your property — we can advise on the best solution.

A standard outside tap installation in a London terraced or semi-detached house takes 1.5–2.5 hours. This includes: isolating the supply, fitting the T-piece and isolation valve, drilling through the external wall, running the supply pipe, fitting the wall plate and tap, testing for leaks, and making good. Complex installations (long pipe runs, through multiple walls, or supply point in a different room) may take 3–4 hours. We give a fixed price before starting — no hourly rate surprises.