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Commercial Office Building → Apartment Building
Convert an underutilized commercial office building into residential apartments — a growing trend as remote work reshapes real estate demand in city centers.
Cost Range
$200,000 – $1,000,000
Timeline
26–78 weeks
Materials Cost
$172,000
Permits Cost
$37,500
Hire a development consultant to assess viability. Verify zoning allows residential use or apply for a variance. Evaluate the floor plate — buildings under 80 feet wide convert best for natural light.
Estimated time: 30 days
Design apartment layouts maximizing window access. Each unit needs a kitchen, bathroom, bedroom, and living area. Plan shared hallways, stairwells, and elevator access per residential code.
Estimated time: 45 days
Add floor penetrations for residential plumbing stacks. Reinforce as needed for new partition walls and bathtub loads. Cut new window openings if the existing facade allows.
Estimated time: 30 days
Run new plumbing risers for kitchens and bathrooms in each unit. Install individual water heaters or a central hot water system. This is typically the most expensive and disruptive phase.
Estimated time: 45 days
Rewire for individual metering per unit. Convert commercial HVAC to residential systems. Upgrade fire safety with residential sprinklers, smoke detectors, and carbon monoxide detectors in every unit.
Estimated time: 45 days
Frame walls, install drywall, flooring, kitchen cabinets, appliances, bathroom fixtures, and lighting in each unit. Install interior doors and closets.
Estimated time: 60 days
Finish hallways, lobby, mailroom, laundry room, and any amenity spaces. Pass all inspections and obtain certificate of occupancy for residential use.
Estimated time: 30 days
| Material | Est. Cost | Required |
|---|---|---|
| Plumbing Infrastructure (per unit average) | $8,000 | Required |
| Electrical Rewiring (per unit average) | $5,000 | Required |
| HVAC Conversion | $50,000 | Required |
| Kitchen Cabinets and Appliances (per unit) | $6,000 | Required |
| Bathroom Fixtures (per unit) | $3,000 | Required |
| Flooring (per unit) | $2,000 | Required |
| Fire Safety System Upgrade | $30,000 | Required |
| Drywall and Framing (per unit) | $3,000 | Required |
| Common Area Finishes | $25,000 | Required |
| Elevator Modernization (if needed) | $40,000 | Optional |
Required for commercial-to-residential conversion. May require planning commission or city council approval.
$10,000
Comprehensive permit covering structural, mechanical, plumbing, and electrical work across the building.
$25,000
Full review of fire safety systems, egress, and sprinkler compliance for residential occupancy.
$2,000
Final approval to occupy the building as residential units.
$500