Uncovered Residential Wood Decks
Unless there are other specific requirements (ie: Conservation Authority, site specific zoning, Greenbelt restrictions, etc), the following information shall apply to the construction of all uncovered residential wood decks:
A Building Permit is required for all decks which are more than 600 mm (2 ft.) above adjacent average grade and are attached to a building;
A Building Permit is required for all decks which are more than 600 mm (2 ft.) above average adjacent grade and are greater than 10 m² (107.64 sq.ft.) in area;
All footings are to be located on undisturbed soil, minimum 1.2m (4 ft) below finished grade. Both foundation and deck structure shall be designed in accordance with Division B Part 9 of the Ontario Building Code.
City of Mississauga Zoning By-law 225-2007, as amended:
→ (Article 22.214.171.124) A porch or deck, located at and accessible from the first storey of the dwelling, inclusive of stairs, may encroach a maximum of 1.6 m into a required front and/or exterior side yard;
→ (Article 126.96.36.199) A porch or deck, located at and accessible from the first storey of the dwelling, inclusive of stairs, may encroach a maximum of 5.0 m into a required rear yard provided that the porch or deck shall have a minimum setback of 1.5 m to the rear lot line. For a lot with a dwelling requiring a 0.0 m interior side yard, the setback to that interior side lot line from a porch or deck, inclusive of stairs, shall also be 0.0 m. For a lot with a dwelling requiring more than a 0.0 m interior side yard, the setback to the interior side lot line from a porch or a deck, inclusive of stairs, shall be 0.61 m; *
*Applies to a porch or deck located in the rear yard only.
→ (Article 188.8.131.52) Any portion of a porch or deck that is located in a rear yard, does not exceed 0.3 m in height above grade at any point and is uncovered, is permitted an unlimited encroachment into the required rear yard;
→ (Article 184.108.40.206) A freestanding deck may be located in a rear yard provided that it does not exceed 1.2 m in height above grade at any point, is uncovered and is not closer than 0.61 m to any side lot line and 1.5 m to any rear lot line.
→ (Article 220.127.116.11) Decks and/or balconies are not permitted on top, above or projecting from any part of an accessory building or structure;
Questions concerning the above information should be directed to the Building Division through our Call Centre at 3-1-1; if calling from outside of Mississauga, please dial 905 615-4311. Questions may also be e mailed to firstname.lastname@example.org
♦ General Information for Open Wood Decks
♦ Sample Construction Detail Sheet: Decks and Porches