Renovating an empty building is a construction problem. Renovating one that stays open is an operations problem with construction inside it. The store still has to trade, the office still has to work, the clinic still has to see patients. Every shutdown, every noisy day and every dusty corridor lands on people who didn't sign up for a construction project.
Owners who do this well plan the building's operations as carefully as the construction. This guide covers phasing, shutdowns, infection control in health care settings, after-hours work and the communication that holds it together.
Start with what the building can't stop doing
Before anyone draws a phasing plan, write down what must keep working and at what level. For a retail property, that's customer access, fire exits, washrooms, loading and point-of-sale systems. For an office, it's power, data, heating and cooling, and a reasonable noise level during working hours. For a health facility, it's clinical services, protected air and water, and safe routes for patients and staff.
That list becomes the set of rules the design and the contractor have to work within. It also sets the budget conversation. Every operating requirement adds cost: temporary partitions, after-hours premiums, temporary services, extra phases. On programs we've supported, the expensive surprises came less from construction than from operating requirements nobody wrote down until the contractor had priced the work.
Phasing: moving people and work around each other
Phasing divides the renovation into zones that are worked on one at a time while the rest of the building operates. The common approaches:
- Swing space. Build or lease temporary space first, move one group into it, renovate their area, move them back, and repeat. It's the cleanest approach and often the slowest.
- Zone by zone. Close a floor, a wing or a section of the sales floor, renovate it behind hoarding, then reopen it and close the next.
- Overnight and weekend work. Keep the building fully open during operating hours and do the work when it's closed. Common in retail and offices, but costly and slow.
Most projects combine all three. The phasing plan should show, for each phase, which zones are occupied, which are under construction, where the hoarding goes, and how people, deliveries and debris get in and out without crossing.
View the data
| Area | Phase 1 | Phase 2 | Phase 3 | Phase 4 |
|---|---|---|---|---|
| Swing space | Construction | In use | In use | In use |
| Zone A | Occupied | Construction | Renovated | Renovated |
| Zone B | Occupied | Occupied | Construction | Renovated |
| Zone C | Occupied | Occupied | Occupied | Construction |
Every phase boundary is a risk. The contractor demobilizes and remobilizes, inspections have to be passed before people move back, furniture and IT have to be ready, and the next zone can't start until the last one is handed back. Put the moves, inspections and owner activities in the schedule as activities with logic, not as notes. Each extra phase adds handovers, so test whether fewer, larger phases would work.
Shutdowns: the riskiest hours on the project
Tying new work into existing systems means shutting things off: power, water, sprinklers, fire alarm, ventilation, the building automation system. In an occupied building, a shutdown that overruns or doesn't come back cleanly is the most visible failure a project can have.
Treat each shutdown as its own small project, with a written plan, approvals and a fallback. A good shutdown plan answers:
- What exactly is being shut off, which areas does it affect and for how long?
- Who has to approve it: facilities, the tenant, the fire safety team, infection control?
- Who is notified, how far ahead, and by whom?
- What temporary measures are needed while it's off?
- How is the system restored and tested, and who confirms it's back?
- What happens if the work overruns: who decides to stop and restore?
Fire protection shutdowns need special care. The University of Toronto's facilities guidance, for example, says a fire watch is needed when a building's fire alarm or sprinkler system is out of service, with the affected area patrolled every hour, each patrol logged, and hot work such as welding prohibited until systems are back. Your fire safety plan and local requirements set the rules for your building, so involve your fire safety lead early.
View the data
| Step | What it covers |
|---|---|
| Request | Scope, areas, duration |
| Approve | Facilities, fire IPAC, tenants |
| Notify | Occupants told in advance |
| Protect | Fire watch, temp. services |
| Execute | After hours, with fallback |
| Restore | Test, confirm systems back |
Infection control in health care facilities
In hospitals, long-term care homes and clinics, construction dust and water disruption aren't just a nuisance. They can carry fungal spores and bacteria that are dangerous to vulnerable patients. In Canada, the governing standard is CSA Z317.13, Infection control during construction, renovation, and maintenance of health care facilities, now in its 2022 fifth edition.
According to CSA, the standard specifies a risk assessment process and preventive and remedial measures to stop exposure to agents released by construction work, and applies to all health care facility projects regardless of delivery method. CSA lists updates in the 2022 edition including a pre-construction checklist, clearer infection control risk assessment (ICRA) and infection control plan requirements, updated hoarding requirements, and guidance on water shutdown and disinfection.
Public Health Ontario's infection prevention and control checklist for construction gives a sense of what an ICRA considers in an existing building: disruption to essential services, how debris moves, traffic flow and clean-up, water systems that limit Legionella, interim heating, ventilation and water supply, and relocating patients based on their risk. It notes that work such as asbestos removal calls for a higher level of preventive measures.
For owners, the practical points are simple. Involve the facility's infection prevention and control team from design, not from mobilization. Price ICRA measures into the contract, because hoarding, negative air and daily clean-up aren't free. And require trades working in the facility to be trained in the measures they'll be inspected against.
After-hours work
Night and weekend work keeps the building open but brings its own costs: premium labour rates, lower productivity, more supervision, and fatigue. It also needs the owner's own people: security to open the building, facilities staff for shutdowns, and someone to sign off the area before it reopens in the morning.
Check the noise rules too. In Toronto, the City's noise bylaw says construction noise that's clearly audible isn't permitted on weekdays from 7 p.m. to 7 a.m., on Saturdays before 9 a.m. or after 7 p.m., or at any time on Sundays and statutory holidays, subject to an approved noise exemption permit. Work that's quiet enough to stay inside your walls may be fine; demolition that neighbours can hear at 2 a.m. may not.
The most common failure is the morning handback. Night work that leaves dust, open ceilings or blocked exits for the morning shift destroys occupants' patience quickly. Make the condition of the area at opening part of the contractor's obligations, inspected daily.
Put the operating rules in the contract
A contractor can only price what it's told. If the tender documents say "building remains occupied" and nothing more, every bidder makes its own assumptions, and the lowest bidder usually assumes the least disruption cost. The gap turns into change orders once the work starts.
Spell out the rules in the tender documents: the phasing plan, permitted working hours by area, noise and vibration limits during operating hours, shutdown notice periods and approval steps, protection and clean-up standards, the routes for deliveries and debris, and the condition each area must be in at handback. In health care settings, include the infection control requirements and who inspects them.
Then budget for it realistically. Occupied work is slower and more expensive than work in an empty building, and the contingency should reflect it. Owners who budget as if the building were empty usually end up paying the difference anyway, through change orders and delay.
Communication: the part that decides how it feels
Occupants will put up with a lot if they know what's coming. They won't forgive surprises. A workable communication plan includes:
- A single owner contact for occupants and tenants, not the contractor's superintendent
- A regular look-ahead notice covering noisy work, shutdowns, access changes and moves for the next few weeks. Our post on three-week look-ahead schedules covers the planning behind it.
- Firm notice periods for shutdowns, agreed with occupants at the start of the project
- A way to complain that gets a response the same day
- Signage and wayfinding for changed routes and entrances, kept current
What owners should do
- Write down the building's operating requirements before design, and make them part of the contract documents.
- Build a phasing plan with the schedule, including moves, inspections and owner activities as scheduled work.
- Require a written plan and approval for every shutdown, with temporary measures, restoration testing and a stop-and-restore rule.
- In health care facilities, bring infection prevention and control in at design and price the ICRA measures into the contract.
- Price after-hours work realistically and check local noise rules before you plan night work.
- Run communication as a workstream, with a named owner contact and a regular look-ahead notice to occupants.
The bottom line
In an occupied building, the measure of success isn't only on time and on budget. It's whether the building kept doing its job while the work happened. Owners who plan operations, shutdowns and communication with the same care as the construction get through it with their tenants, staff and patients still on side.
Planning a renovation in a building that has to stay open? Book a 30-minute call with Benjamin R. Consulting.
Sources: CSA Group, CSA Z317.13:22 Infection control during construction, renovation, and maintenance of health care facilities, product page; Public Health Ontario, CRMD Checklist: Infection control risk assessment; City of Toronto, Noise bylaw; University of Toronto Facilities & Services, Fire watch. The phasing and shutdown examples are illustrative. This article is general information, not legal advice.