Exterior doors must meet most of the same performance requirements as windows for heat, air and moisture control. Doors should be located under overhang protection (roof eaves, recessed under floors above, or canopies), whenever possible.

Choose doors that are insulated to reduce heat loss and that have durable seals and weatherstripping.

Manufactured exterior doors, frames, locks, latches and hinges meet a standard for resistance to forced entry. Any site-built exterior doors must also resist forced entry.

Consider installing wide or double doors if you have exceptionally large appliances or furniture (such as a piano), or to make a house accessible to wheelchairs.

Doors for wheelchair access should have special thresholds of 12 mm (1⁄2 in.) or less in height.

Source : Canada Mortgage and Housing Corporation (CMHC)