How to Schedule a Shutdown Around a Business Day

Why this matters

Turning off water, power or gas in a house inconveniences a family for an hour. Turning it off in a building with businesses inside stops sales, sends customers home and, in the wrong building, spoils product or leaves a fire system impaired. Most outage complaints are not about the outage. They are about the outage nobody planned: the tenant who was not told, the espresso machine that would not restart, the two-hour job that ran four. This article is the procedure for planning one so the businesses barely notice it. How long a given business can actually tolerate being without a service is its own subject; see related: What a Business Cannot Shut Down and for How Long. This is about fitting the work into that tolerance.

Step 1: Ask each occupant for their dead hours

The dead hours are the window when the business is closed, or open but not using the service you will interrupt. Ask the occupant, every occupant, and do not infer them from a sign on the door. A coffee shop that closes at 18:00 may have a baker in at 04:00. A clinic open until 19:00 may run its sterilizer after the last patient. A restaurant "closed Mondays" may be prepping all day Monday.

Why ask: the posted hours are when customers come; the dead hours are when nobody needs the water. Those are different windows. If skipped: you shut the water off on the overnight baker, who has dough proofing and no way to wash.

In a multi-tenant building the usable window is the overlap of every affected tenant's dead hours, which is often much shorter than any one of them.

Step 2: List exactly what loses service, and look for the hidden ones

Find the isolation point you will use and walk everything downstream of it. For water: restrooms, hand sinks, the water heater, and the equipment plumbed in directly, such as an ice machine, an espresso machine, a dishwasher, a dental or medical device, a humidifier. For power: the panel schedule is a starting point, not the answer, because schedules are wrong; ask what is on the circuits and check the refrigeration, the alarm panel, network equipment and any medical or lab device on them.

The one to check every time on water: whether the building's fire sprinkler system is fed through, or upstream of, the valve you will close. A sprinkler system taken out of service is an impairment, and NFPA 25, in the edition your authority having jurisdiction has adopted, sets an impairment procedure that binds the building owner: notifying the fire department and the insurer, and often a fire watch. That decision belongs to the building owner or their impairment coordinator, not to you. If your shutdown impairs the sprinklers, stop planning and route it to them.

Why: the list in this step becomes the notice in step 4 and the restore check in step 7. If skipped: the restore check misses equipment nobody listed, and that is the one that fails.

Step 3: Name the person on site, and the person who can call it off

Get two names with numbers that answer during the window: the person who will be on site or reachable while the service is off, and the person who can approve extending the outage or calling it off if the work goes wrong. In a multi-tenant building that is usually the property manager plus one contact per tenant.

Why two: the person who unlocks the door at 19:30 is rarely the person who can decide, at 21:15, that the outage may run past midnight. If skipped: the go/no-go decision in step 6 has nobody to make it.

Step 4: Notify in writing, with times and a to-do

Send each occupant a written notice: the date, the start and end times, what will be off, what will stay on, what they should do beforehand (fill pitchers, shut down machines that draw water, finish the sterilizer cycle), and what you will check before you leave. A week ahead for a multi-tenant building is a good default; 48 hours is the floor. Ask for a reply.

Why written: a phone call reaches one person; a notice reaches the night baker and the weekend manager too. Why a to-do: businesses that know to shut an espresso machine down before the water goes off do not end up with a machine that dry-fires. If skipped: you will hear "nobody told us" from the tenant who was told by phone.

Step 5: Stage the work so the outage is short, and test the isolation ahead

Everything that can be done with the service on is done before the window: parts on site and checked against the existing pipe or equipment, two of anything whose failure would stop the job, fittings dry-fitted, the work area cleared and protected. The outage should contain only the work that truly needs the service off.

Test the isolation point in advance. An old valve that will not close fully turns a two-hour outage into an all-night one. Where the valve is the building's, exercise it ahead with the occupants' agreement for a minute or two. Where it is the utility's (a curb stop for water, a meter valve for gas, a transformer or meter disconnect for power), only the utility operates it in most places: ask them to check it before the date.

Why: the outage clock starts when the service goes off, not when you start working. If skipped: the first discovery of the night is a seized valve, at the worst possible time.

Step 6: Run the window against a clock, with a go/no-go point

Write the timeline before you start: off, drain or prove dead, the work, restore, test, handback. Set a go/no-go point: the time by which the irreversible step must be done, and after which you stop, restore with what you have, and reschedule. Tell the decision-maker from step 3 the time in advance.

Hazards on the way down: before draining a water system, turn off any water heater or tankless unit that could fire or heat with its tank or exchanger partly empty, and tag it. Before working on power, isolate and lock out per the shop's procedure and prove the circuit dead with a tested meter. Before closing gas, list every appliance downstream; each will need relighting by someone qualified when gas is restored.

Why the go/no-go point: without one, a job that is going badly keeps going, and the outage runs past opening.

Step 7: Test before you reopen

Restore slowly and prove each item on the step 2 list, in order. For water: refill with fixtures open to bleed air, check every joint you made for leaks over at least 15 minutes, flush each branch until it runs clear before reconnecting equipment, then confirm each plumbed appliance fills or runs. For power: confirm each circuit on the list is live and each sensitive load (refrigeration, alarm, network) has come back up. For gas: leak-test, then relight each appliance and confirm it is venting properly.

Why in this order: sediment knocked loose by the work goes wherever the water goes first; flushing before reconnecting keeps it out of an ice machine's inlet. If skipped: you leave a building that looks restored and an occupant who finds the problem at opening.

Step 8: Hand back with a note and a confirmation

Leave each occupant a note: what was done, when service came back, what was tested, anything still open. Text the same to the contacts from step 3. See related: The Business Lockup and Handback SOP.

A worked example: a main valve under two tenants

A plumber is replacing the leaking main shutoff valve in a two-tenant building: a coffee shop and a physical therapy clinic, both fed through that valve. The work needs about 1.5 hours with water off.

Dead hours (step 1). The coffee shop is open 06:00 to 18:00, with the opener in at 05:15. The clinic is open 07:00 to 19:00, and the last laundry cycle for towels runs until about 19:30. The overlap of their dead hours is 19:30 to 05:15. The plumber books 19:30 to 22:00 on a Tuesday.

The list (step 2). Restrooms in both; the coffee shop's espresso machine, ice machine and three-compartment sink; the clinic's washer and a hydrotherapy tub; one shared electric water heater. The fire sprinkler riser is on a separate service line entering beside the domestic line, upstream of nothing the plumber will touch, which the property manager confirms. No impairment.

Contacts (step 3). The property manager can extend or cancel. The coffee shop manager and the clinic director each give a number.

Notice (step 4). Sent eight days ahead: water off 20:00 to about 21:30, coffee shop to power down the espresso and ice machines at close, clinic to finish the laundry by 19:30. Both reply.

Staging (step 5). The upstream valve is the utility's curb stop. The plumber asks the water utility to check it; their crew finds it seized, replaces it four days before the job, and confirms it holds.

The night (step 6). Go/no-go point: if the new valve is not in and tight by 21:30, rejoin the line with the straight coupling staged for exactly that, restore water by 22:00 without a building valve, and reschedule the valve.

The go/no-go point passed with the valve in at 21:05. Water was off from 20:00 to 21:15, 1 hour 15 minutes, inside the 1.5 hours planned.

Restore (step 7). At 21:45, after the 15-minute leak watch, the plumber flushed the clinic branch and the coffee shop's hand sink, ran a hot tap until it flowed steadily with no air, which proves the heater tank is full, then restored the water heater breaker. The coffee shop manager, there to check, reconnected the ice machine. It filled slowly. Its inlet screen was half blocked with scale: the coffee shop branch had been flushed at the hand sink, which is on a different run from the ice machine's line, and that run was never flushed. With the manager's agreement the plumber closed the machine's supply valve, cleaned the screen, flushed the line into a bucket for two minutes and reconnected it. The machine filled normally by 22:20.

What the example shows. The plan worked, and the one miss was step 7 flushing at a convenient faucet rather than on each branch that feeds an appliance. The plumber added "flush each appliance line, not just the nearest faucet" to the shop's notes. The job ran 20 minutes past the 22:00 booking, which the manager agreed to on the spot.

What would change the plan. A business with no dead hours at all (an assisted living building, a 24-hour gym, a data closet) gets a different plan: a temporary supply or bypass so the service never fully goes off, or a short outage with the occupant's own contingency in place. See related: Working in Assisted Living and 55-Plus Communities.

References

• NFPA 25, in the edition your authority having jurisdiction has adopted, for sprinkler impairment procedures
• See related: What a Business Cannot Shut Down and for How Long
• See related: The Business Shutdown Notice SOP
• See related: The Business Lockup and Handback SOP