Building and Renovating

Building and Renovating in Mississauga

Before you start a building or renovation project in Mississauga, you need to find out:

  • What you are allowed to build on your property, and

  • If you need a building permit

Your property's zoning will determine what you can build on your property. For example, the City's Zoning By-law sets out what uses are permitted; how far a structure must be from the lot lines; and, the amount of parking required. A permit is usually needed if you are building and renovating, making interior alterations to an existing building, putting up a sign, or opening a business in a new location.

When is a building permit for residential construction required?

  • Construct/demolish a house or an addition to an existing house

  • Construct/demolish an attached or a detached garage

  • Construct a deck, greater than 10m2 (107.64 ft2) in area, and all decks attached to the house which are greater than 600mm (2 ft) above the adjacent grade

  • Construct a porch or a balcony

  • Construct a basement walkout

  • Construct/demolish a detached accessory structure greater than 10m2 (107.64 ft2)

  • Construct a heated or unheated sunroom

  • Erect tents greater than 60m2 (645.85 ft2) or all tents erected within 3.0 m (9.8 ft) of a building

  • Construct roofing with structural work (i.e.- adding new dormers, skylights)

  • Create new openings for, or increase the size of, doors and windows

  • Excavate a basement to increase existing headroom/ underpinning foundation walls

  • Install, change, remove or repair load-bearing walls and other structural components

  • Install or modify HVAC (Heating, Ventilation and Air Conditioning) systems

  • Install, replace or repair plumbing, drainage or sewer systems

  • Construct a chimney serving a solid fuel fire appliance

  • Change a building's use

  • Install, replace or repair a private sewage system

  • Replace a furnace that is changing fuel type, efficiency or capacity

  • Install a gas fireplace as a heating appliance

  • Fire damage repair (structural & mechanical)

When is a building permit for non-residential construction required?

  • Erect, alter or repair structures over 10 m2 (107 ft2)

  • Change the use of an existing space

  • Undertake tenant improvements

  • Alter interior partitions or the install of skylights, windows or doors

  • Create a patio or covered areas

  • Erect garden centres, tents, air supported structures

  • Erect, alter or repair loading docks

  • Repair balconies and parking structures

  • Alter exterior facades

  • Construct or install accessory structures such as garbage enclosures

  • Construct or install designated structures such as retaining walls, tanks, solar panels and communication towers

  • Undertake mechanical alterations

  • Install commercial kitchen exhaust and suppression systems

  • Install spray booths, dust removal systems

  • Install rooftop HVAC (Heating, Ventilation, and Air Conditioning) replacements

  • Install a structure of any size which contains plumbing

  • Install wood burning fireplaces, ovens, unit heaters and other heating appliances including the alteration, replacement or extension of ductwork

  • Install geothermal systems

  • Undertake site servicing

  • Install new, alter or extend existing plumbing, heating or fire protection systems

  • Install maglocks

When is a building permit not generally required?

  • Construct/demolish a detached accessory structure under 10m2 (107.64ft2) with no plumbing and with a maximum height of 3.0m (i.e. garden/utility shed/gazebo)

  • Construct/demolish an uncovered deck less than 10m2 (107.64ft2) and less than 600mm (2 ft) above adjacent grade

  • Construct/demolish a non load-bearing basement wall (i.e. finishing basement with no plumbing or HVAC [Heating, Ventilation or Air Conditioning])

  • Replace doors and/or windows that are the same size as the existing

  • Install siding on a house, garage or accessory building

  • Re-shingle a roof

  • Install eavestroughs, provided the drainage is contained within the property

  • Damp-proof basements

  • Paint or decorate

  • Install kitchen or bathroom cupboards without plumbing

  • Carry out minor repairs to masonry

  • Erect a fence

  • Carry out landscaping work

  • Install a decorative gas fireplace

  • Fire damage repair (non-structural & non-mechanical

Note: Building permits are not required for residential pools serving 6 or fewer residential housing units. However, a pool enclosure permit is required and can be obtained from the Compliance and Licensing Section, By-law Enforcement Division of the Transportation and Works Department located on the Ground Floor of the Civic Centre.

How long will it take?

If your application is deemed to be a complete submission, review times are legislated based on the type of application. This means that the City of Mississauga will make every effort to meet the following legislative processing times.

10 Days  -  Residential housing type applications, new construction and alterations

15 Days  -  Part 9 scope buildings, other than residential housing

20 Days  -  Part 3 scope buildings, new construction and alterations

30 Days  -  Complex buildings

It is important to remember that processing time is the time to complete the initial review of your application; it does not mean that your building permit will be issued within the legislative processing times.

How do I get help?

  • Call Centre 3-1-1 available during normal business hours (Monday to Friday). Our Call Centre representatives can answer general questions concerning your building permit application. They can also respond to some technical inquiries. Where your inquiry requires a more detailed response, a request will be forwarded to Planning and Building and one our staff will get back you within 2 business days.

  • The City's website is open 24/7 and contains lots of detailed information. The answer to many of your questions can be found online.

  • Email any questions to A response will be provided within 2 business days.

  • Planning and Building Customer Services Centre is located on the 3rd floor (facade side) of the Civic Centre. We are open Monday to Friday between 8:30 am and 4:30 pm to answer any of your questions.

How much will it cost?

Fees for building permit applications are required to be paid in full at the time of application. Most building applications fees for new construction (creating new floor area space), or alterations are calculated by multiplying the area by a cost per square metre.

Please note that there are penalties for starting work before obtaining your permit.

There may be additional fees associated with your building permit application that will need to be paid prior to issuance, depending on the type and scope of your application. The types of fees that may be applicable can be found in the Typical Development Cost Guidelines.

Featured Articles:

  • Paper Submissions for Building Permits
    The following building permit types are still available for paper submission at the counter - fire damage repair, motor vehicle impact repair, backwater valves, emergency plumbing repairs, sewer conversions and revisions to existing paper submissions.


  • Second Units Update
    The Licensing By-law for Second Units has been repealed so the need to obtain a license is no longer required. However, you still need to obtain a building permit to ensure that your unit meets the current building code and/or fire code requirements. We are in the process of developing a new By-law that will require that your unit be on a Registry. To be on the Registry, you will need to have a completed building permit.

    Note: the requirement to obtain a Zoning Certificate in conjunction with License is also no longer required, just a building permit.

    Click the PDF link (4.37 MB) (pdf) to access a document containing the main points for design consideration when preparing drawings for permit submission in conjunction with a second unit. This document contains excerpts from Parts 9 and 11 of the Ontario Building Code to aid the designer by illustrating compliance regulations of the Ontario Building Code.

    This is not meant to be a complete list of all the code requirements.


  • Backwater Valve Permits
    Mississauga City Council passed a resolution waiving building permit fees for the installation of backwater valves for residents affected by the flood on July 8th, 2013.

  • Temporary Tents
    The Ontario Building Code requires building permit approval for Tents and Air-Supported Structures, like those rented for school fairs or other community events. To assist you, find an outline of the typical information to be submitted with your application.

  • Building a Deck
    Building permits for residential uncovered decks are not always required. This article explains conditions in which a building permit is required with respect to deck construction.

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