Plumber in Colindale

Plumbing in Colindale: what is different here

Leaks in new flats: where they usually start

Most leaks we are called to in modern flats start at a small number of places. Push-fit joints under a bath or behind a boxed-in panel can work loose if the pipe was not fully inserted or was not supported. Waste traps under basins, baths and showers loosen as the building settles. Shower trays and wet-room floors leak through failed sealant or grout long before any pipe fails.

Washing machine and dishwasher valves and hoses are another common source. Because pipes in new flats are hidden behind panels, finding the leak is most of the job, and we open as little as possible to reach it.

When the water reaches the flat below

In a block, the first sign of a leak is often a neighbour knocking on your door. Shut off your stopcock, which in a new flat is usually in a kitchen cupboard, a utility cupboard or near the hot water cylinder or heat interface unit, and tell the concierge or managing agent. Once we find the source, we tell you whether it is on your side of the boundary or in the communal pipework.

That matters, because the lease usually makes you responsible for leaks from inside your flat, while the freeholder deals with risers and shared pipes. Photographs and a written note of what we found help with the insurance claim, which in a block often goes through the building's policy.

Hot water without a boiler

In flats without gas, hot water usually comes either from an electric cylinder or, as at Colindale Gardens, from a communal heat network through a heat interface unit, a box in a cupboard with a plate heat exchanger and valves. If your flat has a heat interface unit, its maintenance is usually covered by the heat supplier or the managing agent, so call them first if the hot water or heating fails completely. We can deal with the plumbing around it, such as leaking valves on the flat side, taps, showers and radiators, but we do not service boilers or the heat network itself.

Hard water, even in a new building

Colindale is in Affinity Water's Colindale/Kingsbury zone, which served about 90,000 people in 2025 and measured 333 mg/l total hardness. A new building does not change the water, so scale shows up within a few years: thermostatic shower cartridges lose control, rain shower heads clog, WC fill valves stick, and taps stiffen.

Concealed shower valves and cisterns behind panels are common in new flats, so check where the access panel is before we arrive. Replacing a cartridge or a fill valve is usually a short visit.

Warranty, lease and who pays

Under NHBC's Buildmark, where it applies, the developer is responsible for defects reported in the first two years from legal completion, and shared parts of a block are covered by the policy too. A leak caused by poor installation in that period should go to the developer.

Outside it, or for wear such as a dripping tap, the leaseholder usually arranges and pays for repairs inside the flat. Landlords can authorise us directly, and for agents we work to an agreed spend threshold with photos before and after.

Grahame Park, the older 1970s homes and shared owners

Not every Colindale home is new. Grahame Park's original homes date from the early 1970s, and the ones that remain are being replaced in stages by the regeneration. Where a 1970s flat or house is privately owned, the plumbing is often a patchwork: original copper runs, a replaced bathroom, a combi in place of the old system. In those homes we check isolating valves and old joints before assuming a leak is new.

Shared ownership is more common here than in most of our areas, at 3.3% of households in Colindale North and 4.1% in Colindale South in 2021. Shared owners usually carry the same repair responsibility inside the home as a full leaseholder, so a dripping tap or a blocked basin is yours to arrange even though you own only a share. Check your lease if you are unsure.

Official sources

• Affinity Water AF057 report, 2025
• NHBC Buildmark cover
• Census 2021 accommodation type, Colindale wards (Nomis)
• Beaufort Park on Buildington
• Cambridge Network, September 2020: Colindale Gardens heat network

Last reviewed October 2026 by EliteShires Property Services.