In late January 2020, as COVID-19 cases surged in Wuhan, China began construction on two emergency hospitals built extensively from prefabricated structural and room units. Huoshenshan Hospital was completed in approximately ten days and began receiving patients on 3 February 2020, with 1,000 beds; its larger sister facility, Leishenshan, followed later that week with roughly 1,600 more beds — a combined 2,600 beds. Published duration figures vary depending on whether planning, mobilisation, physical construction, handover, or patient admission defines the programme boundaries.

The engineering interest here is sequencing, not novelty: modular construction let prefabricated ward and diagnostic-room units be produced off-site while foundations, site infrastructure, and MEP connections advanced on site in parallel, compressing a build that would otherwise take months into days — intensive on-site groundworks, connections, fit-out, and commissioning ran alongside the modular fabrication, not in place of it.

2
Hospitals
~2,600
Combined beds
10 days
Huoshenshan build
12 days
Leishenshan build
~7,000
Workers, Huoshenshan
Stage 1
Parallel module fabrication and site works
While foundations and site infrastructure were prepared, prefabricated ward, diagnosis-room, and medicinal-material-library modules were produced off-site in parallel, each built to standard dimensions for rapid on-site connection.
Stage 2
Rapid on-site module installation
Roughly 7,000 workers assembled Huoshenshan's modules around the clock, connecting structure, MEP systems, and negative-pressure ventilation appropriate to an infectious disease facility — work that in conventional hospital construction would be sequenced over a far longer schedule.
Stage 3
Commissioning under operational pressure
Huoshenshan began receiving patients on 3 February 2020, roughly ten days after work began; Leishenshan followed later that week. Published programme totals vary depending on which milestones — planning, mobilisation, physical construction, handover, or patient admission — are counted. Both facilities were staffed in part by military medical personnel deployed alongside the construction handover.
Why modular, specifically

Modular construction was the method that made the schedule possible at all: producing prefabricated ward and diagnostic-room units off-site while foundation and MEP works advanced on site compressed the sequential dependency that would otherwise govern a conventional hospital build — overlapping work a conventional delivery would perform more sequentially — turning what is typically a months-long process into days.

The schedule wasn't achieved by working faster on a normal sequence. It was achieved by overlapping work that conventional delivery would perform more sequentially — advancing site preparation, unit production, installation, and services in parallel wherever interfaces allowed.

Huoshenshan and Leishenshan remain among the clearest demonstrations of modular installation's core commercial proposition: when the fabrication and site-works sequence can run in parallel rather than in series, schedule compression of this scale becomes possible.

For further reading, see Erection Engineering for Modular Installation, which covers the sequencing logic behind parallel fabrication and installation.

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Sources: Engineering News-Record — contractor (China Construction Third Engineering Bureau) and peak workforce figures; CGTN — 24-hour design window, 33,900 m² floor area, and the hospital's 73-day operational life; Hospital Management — prefabricated module layout and the Xiaotangshan precedent. Published figures vary: floor area is given as both 33,900 m² and roughly 60,000 m² depending on whether auxiliary facilities are included, and Leishenshan's bed count as 1,500 or 1,600.