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Decks, Porches and Stairwells

Decks and Porches

Decks and porches are features of many residential properties. If you are planning to construct a new porch or deck first determine your property's zoning designation so that you can review the corresponding zoning regulations.

Notwithstanding any of the regulations, encroachments and/or projections are not permitted within a minimum required setback to a Greenbelt zone as identified in Table of Zoning By-law 0225-2007, as amended. You can find these, and other regulations, pertaining to decks in Part 4 : Residential Zones of the Zoning By-law.


Decks (504kb)
A deck is defined in the Zoning By-law as a platform, with at least one (1) side open, and with direct access to the ground.

The illustration (link at left) outlines the minimum required setbacks to a deck.


Porches (396kb)
A porch is defined in the zoning by-law as a platform, with or without a foundation and/or basement with at least one (1) side open, that may be covered by a roof or other structural element, with or without a foundation, and with direct access to the ground.

The illustration (link at left) outlines the maximum permitted encroachment of a porch, inclusive of stairs.

Section 4.1.8 - Minimum Setbacks to Greenbelt Zones The minimum setback for all buildings, structures, parking areas and swimming pools in Residential Zones to all lands zoned G1 or G2 Base Zone, shall be the greater of 5.0m or the required yard/setback. (0179-2018) The setback for an outdoor swimming pool shall be measured from the inside wall of the swimming pool to a G1 or G2 Base Zone or a G1 or G2 Exception Zone. (0179-2018)

Any information contained herein is strictly for information purposes only and should be reviewed in conjunction with Zoning By-Law 0225-2007, as amended. In the case where the information provided conflicts with that of the text contained in Zoning By-law 0225-2007, as amended, the text shall prevail. It should not be relied on when making decisions in connection with real estate transactions, development proposals or building permits.

Please visit the Mississauga Civic Centre, between 8:30 a.m. and 4:30 p.m. to review the Official Zoning By-law and to speak with staff before making important decisions.

A list of amendments passed by Council but not yet incorporated into the office consolidation copy can be found on the Unconsolidated Zoning By-law Amendments document. 

Copies of Zoning By-law Amendments are available at:
Office of the City Clerk
Corporate Services Department, 2nd Floor.