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Scheduling

Phasing

In Plain English

Dividing a project into separate stages so parts of a building can be occupied or used while work continues.

Definition

Phasing is the division of a construction project into distinct phases or stages, each with its own scope, schedule, and sometimes budget, typically to allow partial occupancy, minimize disruption to ongoing operations, or manage project risk. Phased construction is common in hospital renovations, campus projects, and large infrastructure programs. Phasing requires careful coordination between active construction and occupied areas.

Why It Matters in Bidding

Phasing changes the cost and risk profile of a bid because dividing work into stages adds repeated mobilization, temporary partitions and protection, after-hours or off-season work, and coordination with occupied areas, all of which an estimator must price rather than assume a single continuous build. On hospital, school, and campus projects, the owner's phasing requirements often dictate the schedule logic and infection-control or life-safety measures, so misreading the phasing plan can severely understate a bid.

Example

The school renovation was phased over three summers so one wing could be completed each off-season, and the estimator added temporary partitions, repeated mobilization, and premium summer labor to cover the phased sequence.

Related Terms

Fast-TrackingMilestoneSchedule CompressionCertificate of Occupancy

Frequently Asked Questions

Phasing usually raises cost because each phase can require its own mobilization, temporary walls and dust protection, separate inspections, and sometimes premium or after-hours labor to avoid disrupting occupants. It can also extend the overall schedule and general conditions. Estimators must price these recurring soft costs explicitly, since a phased project rarely costs the same as building it all at once.
Phasing divides a project into sequential stages, often to allow partial occupancy or limit disruption, while fast-tracking overlaps design and construction to compress the schedule, such as starting foundations before the upper floors are designed. They can be combined, but phasing is about staged delivery and occupancy, whereas fast-tracking is about accelerating an overlapping schedule and carries different risk.
Hospitals and schools usually cannot fully close during renovation, so phasing lets parts of the facility stay operational while others are rebuilt. This protects revenue and continuity but requires strict coordination, infection-control or life-safety measures in healthcare, and barriers between active and occupied zones. Owners often spell out the required phasing plan in the bid documents, which contractors must price and follow.

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