How Are Old Schools Converted Into Apartment Buildings?

Schools become apartments by subdividing classroom wings along their existing corridor layout, verifying the structure for residential loads and seismic requirements, replacing institutional MEP with residential systems — plumbing, HVAC, electrical per unit — and adding fire separations, accessibility, and energy upgrades. Gymnasiums and auditoriums become amenities or specialty units with their own structural and systems engineering. The reason school conversions pencil out is that the expensive unknowns are fewer. The structure is usually adequate, the layout is already close to residential, and the building envelope is sound. The money goes into systems and finishes — predictable scopes — rather than structural heroics.

The MEP scope is where a school stops being a school. Domestic water gets completely reworked: new service sized for residential demand, new distribution, new stacks. The waste system is rebuilt for the same reason — classroom buildings don't have the fixture density of apartments, and the new underground work has to thread through existing foundations and slabs. HVAC is a design decision with real consequences. The existing central plant is usually wrong for apartments — residents expect individual control. I typically design either unit-level systems or a zoned central system with individual metering, depending on the building geometry and the owner's operating model. Electrical follows the same logic: new service, new distribution, panels per unit. And fire protection is non-negotiable — full sprinkler coverage for residential occupancy, designed around the existing structure.

School conversions reward thorough pre-design investigation. The buildings are straightforward, but the institutional systems hide surprises. What I confirm before design starts.

• Structural verification: floor capacity, lateral system, and seismic triggers for the occupancy change
• Plumbing feasibility: stack locations, underground routing, and service upsizing at the street
• HVAC strategy: unit-level vs. zoned central, decided before architectural layouts lock
• Fire and egress: separations, second exits, and sprinkler design for residential occupancy
• Specialty volumes: gym and auditorium evaluated for their new use and any inserted structure