Building Permit Application

To apply for a building or demolition permit, you must use the Province of Ontario's Application to Construct or Demolish. You will also need to submit the plans and documents that relate to your project.

Before a permit is issued, Town staff review the submitted plans and documents (such as architectural, structural, mechanical, plumbing, and fire protection drawings) to make sure they meet the requirements of the Ontario Building Code. Detailed submission requirements can be found in the Town's Building By-law.

Building permit fees must be paid when you submit your application.

View a complete list of fees

Download & submit your application

The Town of Halton Hills exclusively accepts building permit applications electronically. To apply online, download the Building Permit Application. When complete, submit the application via our online form.

Ontario Building Code

The 2024 Ontario Building Code (O. Reg. 163/24) came into effect on January 1, 2025. Only drawings and documents prepared to meet the current Code will be accepted for review.

Applicable laws & agency approvals

Before a building permit can be issued, your project must comply with all applicable laws identified in the Ontario Building Code. This may require approvals from other agencies, such as conservation authorities. When applying for a building permit, please submit a completed Applicable Law Declaration Form. 

Additional forms & requirements

Depending on your project, you may need to submit additional forms:

• Water Service Sizing Forms – Required to determine the correct water service pipe size for new houses and for additions, alterations, or accessory dwelling units.
• Commitment to General Review Form – Required for all Part 3 building designs.
• Alternative Solution Application Form – Required if your project proposes an alternative solution under the Ontario Building Code.
• Owner’s Authorization Form – Required if someone other than the property owner is submitting the application.

Changes after a permit is issued

If you make changes to approved drawings or documents after a permit has been issued, you must submit a Revision Application Form. All proposed changes must be clearly identified and highlighted on the revised drawings.