Water leak prevention checklist for retail facilities managers

Most leaks in shops are found late. A meter nobody reads, a stop tap nobody has touched since the fit-out, a gutter full of leaves above the stock room. The damage builds quietly for weeks and then arrives all at once, usually on a Saturday.

A few routine checks catch most of it early. Use the list below as a starting point and adapt it to your estate, whether that is one unit or two hundred.

Stop taps: find them, label them, test them

In a 2021 survey of 500 non-domestic building owners and managers, WaterSafe found that 64% do not check they know where their internal stop tap is. When a pipe bursts at three in the morning, knowing where it is can be the difference between a mop and a refit.

Find the main internal stop tap. In most properties it sits close to where the supply pipe enters the building.
Label it clearly and add its location to the store’s emergency information and your helpdesk records.
Test it on a routine schedule. WaterSafe’s advice is to check it actually shuts off the supply, and never to force it. A valve that will not turn needs a plumber before you need it in anger.
Map the local isolation valves too: washrooms, staff kitchens, cleaners’ sinks, drinks machines and water-fed chillers.
In shared buildings, confirm with the landlord or centre management which valves and meters serve your unit.

Meter reads: the cheapest leak detector you have

MOSL’s customer guidance for the business water market recommends taking regular meter readings, where it is safe to do so, to avoid high bills and spot leaks. It also suggests fitting meters on private pipework so you can see how water is used in different parts of a site.

A simple routine:

Read the main meter at the same time each week and log it.
Once a month, run a no-use test. Turn off every tap, appliance and water-fed machine, then take two readings a known number of hours apart with nothing running in between. Dŵr Cymru Welsh Water’s business guidance explains that if the dials are still moving with everything off, you probably have a leak.
Compare each month with the same month last year. A step change with no change in trading deserves a closer look.

Speed matters. In England’s business water market, MOSL’s guidance says leaks on the supply pipe should be repaired within 30 days of your becoming aware of them, and leaving a leak unrepaired after a formal notice from the water company can rule out a leak allowance altogether. The same guidance says only one allowance will normally be granted in any 24-month period, which makes stopping a repeat worth the effort.

Winter protection

WaterSafe’s advice is to insulate pipes in unheated areas with lagging. It also notes that insurers are paying more attention to escape of water claims after pipes freeze and burst, so commercial premises should check their policies for specific provisions.

Lag exposed pipes in roof spaces, service yards, external toilets and unheated stores.
Check the heating has a frost setting, and that it works, before the cold arrives.
If a pipe freezes, turn off the water at the stop tap. Scottish Water’s advice is never to thaw pipes by switching on an immersion heater or central heating boiler. Warm frozen sections gently, for example with a heated cloth, and check for leaking joints or bursts.
Read your policy for conditions on unoccupied or closed premises before a winter closure starts.

Temporary closures and refits

A shut shop with the water left on carries two risks. Leaks go unseen, and water sitting still in little-used pipework raises the legionella risk.

Before a closure, agree with a competent plumber whether to isolate and drain down, or keep the system live with regular checks.
Flush little-used outlets. HSE’s legionella guidance recommends a regular flushing programme, weekly, for infrequently used outlets, and removing dead ends from the system. Your legionella risk assessment should set out what applies to your site.
After a refit, ask for the new pipe layout on a drawing. The Water Supply (Water Fittings) Regulations 1999 say no water fitting may be embedded in a solid floor or wall, joints must not be concealed, and every water system must be tested and flushed before it is first used. Scotland has its own byelaws covering water fittings.
Remove capped-off dead legs the old layout left behind.

Contractors

Drills, fixings and floor grinders find the pipes nobody drew. A few habits cut the risk.

Share pipe routes and drawings with any contractor who will drill into floors, walls or ceilings.
Use a permit to work for intrusive jobs. HSE’s brief guide to using contractors covers sharing risk information, agreeing controls and coordinating the work, including permits to work.
Check the asbestos register first. HSE advises assuming that a building built or refurbished before 2000 contains asbestos.
Ask for plumbing work to be done by a WaterSafe approved plumber, and keep the paperwork.

Washrooms

Washrooms are full of fittings that can fail without anyone noticing.

Listen for cisterns refilling when nobody has flushed.
Check urinal flush controls stop flushing when the store is shut.
Look for staining and soft flooring around pans and behind panels.
Fix dripping taps and failed seals promptly.

Persistent damp or unexplained loss here calls for a washroom leak survey.

Roofs and gutters

Flat roofs with internal outlets are common on retail units, and a blocked outlet can put water inside the building instead of down the pipe.

Clear gutters, outlets and rainwater pipes before autumn and after storms.
Check around roof plant, flashings and roof lights.
Look up at the ceiling tiles in back-of-house areas, where nobody else does.

A leak that only shows in wet weather points to the roof or drainage rather than the supply pipe. See roof leak detection.

Your escalation plan

Write this down before you need it and give every store manager a copy.

What someone sees	First action	Who to call
Water pouring from a pipe or ceiling	Turn off the stop tap, cordon the area, keep water away from electrics	Emergency plumber, then landlord or centre management
Water near electrical equipment	Keep people away and do not touch it	Electrician
Meter moving with everything off	Photograph two readings and note the times	A leak detection company
Damp or staining with no visible source	Photograph it, note the date, check next door and upstairs	Landlord or centre management, then a leak survey
Heating pressure keeps dropping	Log the readings	A heating engineer or leak detection company

Before a leak happens, check who pays for what. GOV.UK’s guidance for business tenants is that your lease should say who is responsible for repairs and maintenance of the property.

The checklist at a glance

How often	Check
Weekly	Meter reading logged, washrooms walked, little-used outlets flushed where your risk assessment requires it
Monthly	No-use meter test, stop tap and isolation valves checked
Each season	Gutters and roof outlets cleared, roof plant and ceilings checked
Before winter	Lagging checked, frost settings tested, closure plans agreed
Before any works	Drawings and asbestos register shared, permit issued

If the checks turn up a leak you cannot find, call 0333 567 2615. The number is also on our contact page. Our engineers cover England, Scotland and Wales.

Frequently asked

How often should a shop read its water meter?

There is no fixed rule. MOSL's guidance for business customers recommends regular readings where it is safe to take them. Weekly readings, plus a monthly test with everything switched off, mean a new leak shows up in your own records well before the next bill does.

Do we need to keep flushing taps while the store is closed?

Often, yes. HSE's legionella guidance recommends a weekly flushing programme for outlets that are used infrequently. The right approach for your site should come from its legionella risk assessment, and for a long closure draining down may suit better, so take advice from a competent person.

Who pays to fix a leak on the pipe between the meter and the shop?

Usually the customer or the landlord. MOSL's guidance says the customer, or their landlord, is normally responsible for pipework from the property boundary, while the wholesaler owns the mains and communication pipes. Your lease should say who is responsible for repairs.