Cold water storage tanks are usually located in loft spaces and supply water to gravity-fed systems in the home. Replacing or installing a cold water tank can be physically demanding work, often involving lifting tanks through small loft openings, working in restricted spaces, and draining the system before disconnecting pipework. The time required usually depends on loft access, the size of the tank, and the condition of the existing installation.
Below is a general guide to labour costs for cold water tank installation and replacement.
Cold Water Tank Replacement
Replacing an existing loft tank with a similar tank in the same position often involves draining the system, disconnecting pipework, safely removing the old tank, and installing the new one in the loft.
Typical labour cost: £320 — £550
Time: around 4–6 hours
New Cold Water Tank Installation
Installing a new cold water tank where pipework needs adjusting, supports need strengthening, or access is limited will usually take longer.
Typical labour cost: £420 — £700
Time: around 5–8 hours
Float Valve Replacement
Replacing a faulty float valve inside a loft tank is normally a shorter job when access to the tank is safe and clear.
Typical labour cost: £100 — £180
Time: around 1 hour
Cold Water Tank Cleaning
Cleaning a cold water tank involves draining the tank, removing debris or sediment, cleaning the interior safely, and refilling the system.
Typical labour cost: £160 — £300
Time: around 2–3 hours
When costs can vary
Loft tank work can take longer depending on access and safety conditions. Additional time may be required if:
loft access is small or restricted
there is limited safe working space in the loft
the tank needs to be carried through a loft hatch
the old tank is heavy or difficult to remove
pipework needs adjusting or replacing
tank supports or boarding need strengthening
insulation needs removing or replacing
All prices shown are labour-only estimates intended as a general guide. The final cost is confirmed after seeing the job and checking the existing installation.
