A building permit is required in Milton to build certain decks. If your deck meets the following criteria, you need to apply for a building permit:

  • A freestanding deck greater than 10 m² in area
  • A freestanding deck with the floor higher than 0.6 m² above finished grade at any point
  • Attached to a building or structure

Apply for a permit

In order to add a deck to your property, and before any construction has started, you’ll need to apply for a building permit.

Application forms

You’ll need to submit the following forms:

Construction drawings

Please submit the following construction drawings with your application:

  • Site Plan (sample D-1)
  • Deck structural/floor layout (sample D-2)
  • Deck section and details (sample D-30)
  • Sections and wall/ceiling/fire separation construction details (sample A-7)
Refer to the sample drawings for specific drawing requirements, including the number of copies for each drawing required. Review our drawing submission guidelines.


Refer to the building by-law fee schedule for the associated fees:

  • Unenclosed Deck or Porch fee
  • Deck Alterations Building Permit fee

Zoning regulations

Review the Zoning By-law before applying to make sure you follow all building guidelines for your property. This includes regulations for the:

  • Height of the deck
  • Installation of privacy screening
  • Location of the deck
  • Stairs

New subdivisions

If your subdivision hasn’t been assumed by the Town of Milton, you will need a developer’s clearance letter from the builder to build a deck. Contact your builder to get the letter.

You can give us a call at 905-878-7252 x2500 to find out if your subdivision has been assumed by Milton.

Book a building inspection

You need to book a building inspection to ensure your deck meets all Building Code and zoning regulations. Typical deck inspections include:

  • Footing
  • Framing
  • Final building