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Phasing construction in an operating hospital means dividing the work into controlled stages that keep clinical services safe and usable—not simply building one area at a time. The hospital should set each phase through a multidisciplinary team and a documented infection-control risk assessment (ICRA), then use that assessment to define containment, airflow, access, patient moves, utility protections, monitoring, and return-to-service requirements. No sequence can guarantee zero disruption; the goal is to identify and control risks before work starts, and to change course when controls or care needs change.
How do you renovate a hospital while it is open?
Start by treating patient care as a constraint on the construction plan, not a downstream scheduling issue. Before mobilization, connect infection prevention, facilities engineering, clinical operations, construction leadership, and the departments affected by the work. CDC recommends a multidisciplinary team that includes infection-control staff and calls for a summary of the team’s activities. The wider role list is a practical way to make sure clinical capacity, building systems, and construction logistics are considered together.
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The team should define the project scope and clinical conditions, conduct an ICRA, and translate its findings into a written plan for each phase. That plan should say where work is allowed, how the work zone is separated from care areas, how air and water systems will be protected, how people and materials will move, what will be monitored, and what happens if a control fails. CDC’s environmental infection-control recommendations provide the infection-control framework; they do not prescribe a universal schedule or phasing sequence for every hospital.
“Without disrupting patient care” should not be read as a promise that no service, route, room, or schedule will ever change. A safe plan may require temporary moves, access detours, or carefully coordinated service interruptions. The hospital should make those decisions explicitly, with the affected clinical teams, rather than allowing construction logistics to determine them by default.
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What is an ICRA for hospital construction?
An infection-control risk assessment is a preconstruction review of how construction, renovation, repair, or demolition could expose susceptible patients to dust or moisture. Its purpose is to identify the risks and determine the containment and preventive measures the project needs before work begins.
CDC’s guidance says an ICRA should consider the type and extent of work, the patients who may be exposed, dust and moisture, and the spaces around the project. That includes adjacent patient-care and supply areas as well as spaces on floors above and below. Airflow patterns and pressure differences can affect whether contaminants travel beyond the work area, so the assessment should consider the building’s actual layout and systems rather than relying on a floor plan alone. See the CDC’s air-control guidance and its Guidelines for Environmental Infection Control in Health-Care Facilities.
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The ICRA is a project-specific decision tool, not a standard phase calendar. It does not itself supply a hospital-specific patient-relocation threshold, acceptable pressure reading, or commissioning protocol. The hospital’s infection-prevention, engineering, clinical, construction, and compliance leads must define those details for the site and applicable requirements.
What should the team decide before work starts?
Before mobilization, the team should convert the ICRA into practical controls, responsibilities, and contingencies. A useful preconstruction checklist includes:
- Work scope and boundaries: Identify the tasks, locations, adjacent spaces, and likely dust or moisture pathways for the phase. Define where construction ends and patient-care or support operations begin.
- Patients and services at risk: Identify susceptible patient populations and critical clinical functions near the work. Consider whether any affected service or patient needs to move, and coordinate the decision with clinical leadership.
- Air and water systems: Identify relevant HVAC and water-system components, how the work could affect them, how performance or integrity will be monitored, and who responds to an interruption or damage.
- People, supplies, and debris routes: Set construction access, worker routes, pedestrian detours, and debris-removal arrangements so they do not conflict unnecessarily with patient-care traffic or essential supplies.
- Containment and monitoring: Specify barriers and airflow controls, how their integrity will be checked, who performs the checks, and what triggers corrective action or a pause in work.
- Communication and training: Determine which workers and affected staff need training, what notices will be posted, and how clinical teams will receive updates when routes or conditions change.
- Contingencies and authority: Document responses to containment failure, HVAC interruption, water-system damage, or unexpected dust or moisture. Name who can require correction or stop work when controls are not being maintained.
- Cleaning and handback: Set expectations for daily cleanup, controlled debris removal, terminal cleaning, and verification under facility procedures before an affected area returns to use.
CDC recommends incorporating infection-control adherence requirements into construction contracts and defining mechanisms for timely correction. That makes the plan more than a set of intentions: workers, supervisors, and hospital staff need a shared understanding of the required controls and how deviations will be handled.
How should a hospital divide work into phases?
There is no CDC-mandated sequence for every hospital. A practical sequence is to plan, prepare, execute one controlled phase at a time, respond to deviations, and deliberately close out each area before handback. The appropriate size and order of phases depend on the ICRA, the clinical services involved, building systems, and the hospital’s ability to maintain controls.
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- Plan: Assemble the multidisciplinary team, define the clinical and construction scope, and document the ICRA. Map susceptible patients, adjacent spaces, air and water systems, and likely dust or moisture paths. Identify contingencies before setting a start date.
- Prepare: Confirm work boundaries, barriers, airflow controls, worker training, notices, detours, and construction access. Decide whether patients or services should move. Include infection-control requirements in contracts and identify who checks compliance and directs corrections.
- Execute the phase: Keep the agreed controls active and monitor them. Check airflow and barrier integrity, maintain routes that separate workers and debris from patient-care traffic, clean work zones and entrances daily, and monitor HVAC performance. Communicate changed conditions to affected teams.
- Respond to deviations: Follow the documented response if containment fails, dust or moisture appears unexpectedly, HVAC is interrupted, or water-system damage occurs. Escalation thresholds should be set by the hospital for its own conditions; CDC does not supply a universal threshold.
- Close and hand back: Remove debris in a controlled manner, complete terminal cleaning, and verify system integrity and room readiness under facility procedures. Return the space or service to use only after the hospital’s applicable checks are complete.
For a large project, the same logic applies to successive work areas: a new phase is not ready merely because the previous construction task is finished. The hospital must account for containment, cleaning, building-system condition, and clinical readiness before the next area is opened or the prior area is returned to service. The exact handback criteria belong to facility procedures and applicable requirements; there is no single CDC release test for every project.
How do hospitals control dust during renovation?
They separate the work zone from occupied care areas, control airflow where needed, manage routes and debris, and check that the controls continue to work. CDC recommends barriers to keep dust out of patient-care areas and negative pressure in work zones next to patient-care areas. It also recommends monitoring airflow and barrier integrity, controlling worker and pedestrian routes, and cleaning daily.
These measures work as a coordinated system. A barrier that is damaged or poorly maintained may no longer separate the work from care; an airflow control that is not monitored may not provide the intended direction of movement. The team should define who checks barriers and airflow, how often under the project plan, how results are communicated, and what correction follows a failure. The available data does not establish a universal pressure value or monitoring interval, so those specifications must come from facility engineering and the site-specific assessment.
Construction equipment can support the plan, but it cannot replace it. A HEPA air scrubber or negative-air machine may be considered as part of work-zone controls, subject to engineering review and the ICRA. CDC does not endorse a particular brand or model, and the presence of a machine alone does not establish that containment is adequate.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsBarriers and routes also have to work safely in an occupied building. CDC notes that barriers must comply with fire codes. The hospital should coordinate barrier placement, access changes, and any affected egress arrangements with the appropriate facility and safety authorities rather than treating infection control as the only design constraint.
When should patients or services be moved?
Use the ICRA to decide whether relocation is needed, especially when work is in or next to a protective-environment area or another space serving highly susceptible patients. CDC does not specify one universal relocation threshold or sequence. The decision should weigh the exposure risk against the clinical and operational consequences of moving patients or services.
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Before a move, the clinical team should establish where care will continue, how access and support services will work, and how the change will be communicated. Those operational details are hospital-specific; the CDC infection-control framework does not provide a department-by-department relocation plan. If a move is not appropriate, the team should identify what additional containment, access, monitoring, or scheduling controls are needed, and determine whether the work can proceed safely under those conditions.
When choosing between alternative phase sequences or containment approaches, compare them against the same questions:
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- How reliably can the approach control dust, moisture, and airflow?
- What effect will it have on essential clinical capacity, access, and patient movement?
- Could it interrupt or damage HVAC or water systems?
- Can staff maintain and monitor the controls throughout the phase?
- What burden will relocation, cleaning, and return to service place on clinical operations?
This is a decision framework synthesized from CDC risk factors and controls, not a CDC scoring tool. A sequence with a smaller work area is not automatically safer if it makes containment unreliable or creates an unacceptable clinical bottleneck.
How should HVAC and water systems be protected?
Treat building systems as active project controls, not background infrastructure. Coordinate ventilation work with facilities engineering, monitor HVAC performance during the phase, and protect water-system integrity. CDC says not to shut down HVAC systems in patient-care areas except for specified circumstances, so a construction schedule should not assume that a routine shutdown is acceptable.
Before work begins, the team should identify relevant equipment and pathways, understand how planned work could affect them, and agree on who monitors system performance and responds to a failure. If work could affect a water system, the plan should address protection and the response to damage. CDC guidance supports these controls but does not prescribe a project-specific commissioning protocol, operating limit, or universal test for return to service.
Unexpected HVAC interruption or water-system damage should be treated as a deviation from the plan, not as a minor scheduling issue. Follow the hospital’s documented escalation process, determine the effect on affected spaces and services, and correct the condition before those spaces are used as planned. The response and release criteria must be established by the hospital’s qualified teams for the actual system and clinical setting.
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What should happen if containment or operations are affected?
Every phase needs a response plan for foreseeable failures and unexpected conditions. CDC calls for contingency planning and identifies circumstances such as HVAC or water-system problems, dust or moisture exposure, and suspected airborne infection as relevant to infection-control planning. The hospital should set site-specific escalation thresholds, responsibilities, and communication paths before work starts.
If a barrier or airflow control fails, the immediate response should follow the facility’s plan: notify the designated leads, assess whether dust or moisture may have reached occupied areas, and make the required correction before proceeding. The CDC recommendations support monitoring and timely correction but do not set one universal stop-work rule or exposure threshold. Those decisions must be explicit in the project plan.
If an HVAC interruption, water-system issue, or suspected airborne infection occurs, involve the appropriate engineering, infection-prevention, and clinical personnel under the hospital’s response procedures. CDC notes that surveillance for airborne environmental disease may be appropriate for immunocompromised patients. That is a context-dependent consideration, not a requirement for identical surveillance in every project.
Communication matters during a deviation: affected clinical units need to know whether routes, rooms, services, or precautions have changed. Keep a record of the team’s decisions and corrective actions. CDC recommends maintaining summary statements of the multidisciplinary team’s activities, which helps preserve accountability as phases and personnel change.
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How should the hospital return an area to service?
Complete a controlled closeout before patients, staff, or supplies return to an affected space. CDC supports daily cleanup, terminal cleaning, debris removal, and attention to system integrity before use. The hospital should apply its own facility procedures to confirm that the area and relevant systems are ready; CDC does not publish one universal release threshold for construction handback.
At minimum, the project team should confirm that debris has been removed without carrying it through patient-care traffic, the work zone and entrances have been cleaned, terminal cleaning is complete, and relevant HVAC or water-system concerns have been resolved. The clinical or operational lead should confirm that the room or service can resume its intended function under facility procedures. If a check fails, keep the area out of service and follow the site’s correction and reassessment process.
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CDC guidance provides infection-control recommendations, not a complete construction-delivery manual or jurisdiction-specific code interpretation. Local fire and other applicable requirements still matter. Older CDC guidance also notes that references to the AIA Facilities Guidelines have been superseded by Facilities Guidelines Institute guidance; confirm the current standards and local requirements that apply to the project.
Frequently Asked Questions
Does an ICRA replace building permits or code review?
No. An ICRA addresses infection-control risks from construction activity; it is not a substitute for permits, fire-code review, or other applicable approvals. The project team should confirm requirements with the relevant authorities and facility specialists.
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No. CDC provides infection-control recommendations, not a universal phase count, duration, or department-by-department sequence. Hospitals need to set those details around the project scope, patient risks, services, systems, and local requirements.
Does CDC give a required negative-pressure reading for a construction zone?
The cited recommendations call for negative pressure in work zones next to patient-care areas and monitoring of airflow, but the available data does not specify a universal pressure value. The project’s engineering and infection-prevention teams must set suitable site-specific controls and response criteria.
Can construction continue during a hospital outbreak?
The cited CDC material does not establish a blanket rule for continuing or stopping construction during an outbreak. The hospital should reassess the project’s risks and controls with infection prevention, engineering, and clinical leadership in light of current conditions.
