Add a Unit to the Top and Convert

The top addition & subdivision case study involves creating distinct living units by subdividing the existing structure of the house in the vertical axis AND adding an addition to the top of the existing home. Interior walls are added to create the necessary rooms within each unit and demising walls are added between units to create necessary fire separations. The project introduces new kitchens and bathrooms for each unit. Major considerations include plumbing, fire separation, and unit access.

Design Specifications

# of Units: 1

Existing House
4 Bed / 2 Bath
107.3 sqm (+107.3 sqm basement and garage)

# of Units: 5

Unit 1 – Ground Floor – Front
1 Bed / 1 Bath
52.1 sqm

Unit 2 – Ground Floor – Rear
1 Bed / 1 Bath
49.3 sqm

Unit 3 – Top Addition
2 Bed / 1 Bath
60.5 sqm

Unit 4 – Basement
2 Bed / 1 Bath
75 sqm

Shared Spaces
Laundry
Mechanical Room

Cost Considerations

*This sample design might cost somewhere in the range of $800,000 - $1,442,000

Whatever you are deciding what type of unit to add, it is important to understand what the major cost considerations are. For a top addition and conversion project, these are:

Unit Egress
Fire and Sound Separation
New Bathroom(s)
New Kitchen(s)
Site Work
New Construction