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Calculating Building Height

Average Grade, Established Grade & Calculating Building Height

During the City's review of your application staff may ask you to verify, the height or number of storeys of the proposal.

Building height can be measured from either the established grade or the average grade. Which grade applies to your project depends on the building type.

Steps to take:
  • determine which grade requirement applies
  • calculate the grade elevation
  • provide a dimension from the grade to the applicable building height. Ensure the height complies with the maximum heights permitted in Zoning By-law 0225-2007.

The two types of grade within the zoning by-law are:

Average grade

Average Grade (101kb)
Average grade - detached, semi-detached , duplex or triplex dwellings: the average of eight (8) grade elevations, six (6) of which are taken along the side lot lines of a lot and two (2) of which are taken at the centre line of the street on which the lot has frontage. The first two (2) grade elevations shall be taken at the points of intersection of the front lot line and each side lot line. The second two (2) grade elevations shall be taken along each side property line at the minimum front yard setback requirement of the zone in which the property is located. The third two (2) grade elevations shall be taken along each side property line at a distance of 15.0 m back from where the second two (2) grade elevations were measured. The last two (2) grade elevations shall be taken at the points of intersection of the street center line and the projections of the side lot lines.

Calculating average grade information sheet


Established grade

Established Grade (600kb)
Established grade means, with reference to a building, structure or part thereof; the average elevation of the finished grade of the ground immediately surrounding such building or structure and when used with reference to a street, means the elevation of the street, established by the Municipality or other designated authority. In certain instances an applicant may be requested to provide established grade in order to confirm the location of the "first storey" in addition to either of the grade calculations.

Calculating established grade information sheet 


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.