Add a Unit to the Side

The side addition case study involves adding a distinct living unit by building a new structure connected to the side of the existing structure of the house. The only changes made to the existing building are to the adjoining side wall which now acts as the fire separation and unit demising wall. Unit access to the side addition exists off the front of the addition. Major considerations include allowable building area, construction implications, and plumbing.

Design Specifications

# of Units: 1

Ground Floor Area = 117.9 sqm
Basement Floor Area = 117.1 sqm
4 Bed / 2 Bath
235.0 sqm

# of Units: 2

Unit 1 – Existing House
3 Bed + Den / 2 Bath
235.0 sqm

Unit 2 – Side Addition
1 Bed / 1 Bath
31.8 sqm

Cost Considerations

*This sample design might cost somewhere in the range of $313,000 - $681,000

Whenever you are deciding what type of unit to add, it is important to understand what the major cost considerations are. For a side addition, these are:

Unit Access
Fire and Sound Separation
Site Work
New Construction