Homeowner guide and building permit in Ontario

A Building Permit is your formal permission to begin the construction, demolition, addition, or renovation on your property.

Building services and permits - Town of Pelham

As part of the Building Permit process, Toronto Building staff must review your plans to ensure they comply with the Ontario Building Code, local Zoning By-laws, and other Applicable Law.

As the building owner, you are ultimately responsible for complying with all building requirements. Failure to obtain building permits can result in costly construction delays, legal action, and/or the removal of work already completed.

The following is a list of common projects that require a building permit. The list is not exhaustive. If you have any questions please contact Toronto Building.

  1. Construct a new building
  2. Construct an addition to an existing building, such as
    • second or third story additions
    • attached garages, carports
    • sunrooms
    • solariums, porches, decks
  3. Make structural or material alterations, such as
    • adding or removing walls (i.e., changing room sizes and/or uses)
    • new windows or doors where there were none before
    • enlarging or relocating existing windows or doors
    • enclosing an existing deck, porch or patio of any size
  4. Construct an accessory structure larger than 10 square metres* (108 square feet) in area, such as
    • Detached Garage
    • Workshop
    • Garden shed
    • Carport
    • Pool house or cabana
      • *Note: If you are constructing an accessory structure and it is attached to an existing building and/or has plumbing, regardless of its size, a building permit is required.
  5. Finishing a basement, if the work proposed includes any of the following,
    • structural or material alterations
    • installing or modifying the heating and or plumbing systems
    • excavating and/or constructing foundations
    • basement underpinning
    • constructing a basement entrance
    • adding a second suite
  6. Energy and environmental building improvements, such as
    • rooftop stormwater retention systems
    • green roofs
    • structures used in the support of a wind turbine generator with a rated output of more than 3kW
    • solar projects such as installation of solar collector systems and solar hot water systems
  7. Construct a deck more than 60 centimeters (24 inches) above ground
  8. Construct a retaining wall more than one metre (3 feet 3 inches) in height provided the retaining wall is on or adjacent to public property (including streets), building entrances, and on private property accessible to the public
  9. Constructing a tent that
    • covers more than 60 metres squared (646 square feet); and/or
    • is attached to a building; and/or
    • is within 3 metres (9 feet 10 inches) from another structure.
  10. Demolish or remove all, or a portion of a building
  11. Install or reconstruct a chimney or fireplace
  12. Install a wood burning stove or fireplace
  13. Install or modify heating and or plumbing systems
  14. Install a backwater valve
  15. Install a backflow prevention device
  16. Change a building’s use (i.e. from residential to office or single dwelling unit house to multi-dwelling unit house). Even if no construction is proposed, if a change of use is proposed a building permit is required.

For a detailed list of the process from start to finish can be found at Forever Homes Building a Home resource

Specifically, a permit is required when you are:

  1. Building a new structure that is larger than ten metres
    squared (108 square feet).
  2. Building any addition to an existing structure.
  3. Renovating, including alterations that affect your
    building’s compliance with building regulations (known
    as Material Alteration*).
  4. Demolishing all, or part of, a building.
  5. Installing new, or altering existing, mechanical or
    plumbing systems.
    *Material Alteration refers to alterations that will affect your project’s
    compliance with building regulations. For example, if a project involves
    alterations to the structural design of the building; mechanical, electrical,
    plumbing services; fire separations; and existing fire protection systems; and/or
    a change to the use of a building.

Work that requires a building permit:

Generally, all of the following work requires a building permit
before beginning construction:

• Carport/attached garage

• Interior renovations including

• basement finishes

• accessory apartments or the addition of a second suite

• new or altered plumbing or mechanical system

• Window/door (if a new opening is created or existing opening is enlarged)

• Drain repair

• Green roof

• Chimney/fireplace (other than direct vent gas fireplace)

• Recladding with brick or stone veneer

• An addition

• Backwater valve installation

• Exterior basement stairwell or entrance

• Pool fence enclosure

• Deck/porch/balcony (if the deck is more than 60 centimeters (24 inches) above the ground)

• Accessory structure (if greater than ten square meters, such as a garage)

Examples of when a permit is not required can be found online at www.toronto.ca/building-permit-required


The following are examples of work that do not require a building permit and are not subject to the provisions of the building code.

However, please note that this list is not exhaustive and judgment should be used depending on the situation and circumstances associated with the project. Even if a building permit is not required, compliance with the Zoning Bylaw is required.

  1. An uncovered platform (e.g. deck) provided:
    • its finished deck level is not more than 60 cm (24 inches) above the adjacent finished grade; and/or
    • it does not form part of an exit required under the building code; and
    • complies with the Zoning Bylaw.
  1. Installing a skylight in an existing building provided:
    • the building is a house or small building (3 stories or less) and
    • the installation does not require the removal of more than one rafter, joist, or another similar structural member (with the exception of a truss);
  2. Re-cladding of a house or small building (3 stories or less) with non-combustible material other than brick or stone veneer;
  3. Adding or replacing insulation;
  4. The replacement of windows or doors provided:
    • there is no change in the location or size of the window and/or door;
    • the structural support for the opening (i.e. lintel) is not affected; and
    • a new exit is not created;
  5. Replacing a furnace or boiler in a house;
  6. The installation of additional cooling systems, gas fireplaces, air cleaners, in-line humidifiers, or hot water tanks in a house;
  7. Repairing and replacing plumbing fixtures;
  8. Replacing existing roofing material provided no structural work is required;
  9. Finishing a basement of a house, if:
    • the work does not include structural or material alterations;
    • no additional dwelling unit(s) is (are) created (i.e. a second unit); and
    • the work does not include the installation of new plumbing;
  10. Undertaking waterproofing repairs to a basement;
  11. Installation of cabinetry and millwork.
  12. Plastic Sheet Covered Accessory Structures (i.e. snow canopies, driveway tents, automotive canopy) do not require a building permit if installed on or after October 15th and are removed on or before April 15th. Compliance with the Zoning Bylaw is required.
  13. Constructing a retaining wall that is on private property, not accessible to the public and/or where the height is less than 1 metre in height at any location.
  14. A building permit is not required to install a sump pump.


Note this guide is not the official guide, its reference from Toronto building permit. As a homeowner or builder, we highly recommend to visit the city website to confirm the information above.


PDF guide

City website

Request a permit

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