A below-grade entrance combines exterior site work with an opening in the house foundation. Its location should be designed before excavation begins.
Check the Property
- Legal survey and property lines
- Side-yard width and grading
- Utilities and exterior equipment
- Adjacent foundations and structures
- Conservation authority or other approvals
Coordinate the Interior Layout
The exterior door must arrive at a usable interior location with appropriate headroom, circulation and unit relationship.
Design the Foundation Opening
Foundation material, footing depth, wall loads and the proposed door size determine the structural detail. Do not assume an existing window can be enlarged without design.
Control Water
The stairwell collects rain and snow. Drainage, waterproofing, grading and maintenance must work together at the bottom landing and foundation wall.
Build Safe Exterior Access
- Consistent stairs and landing
- Guards and handrails
- Exterior lighting
- Door threshold and weather protection
- Snow and ice maintenance
Remember the Complete Unit
A separate entrance is only one part of a legal basement apartment. It does not replace the remaining permit, safety, registration or licensing requirements.
Request a basement assessment
Share the current condition, intended use and the type of help you need.