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
  • 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 permits page 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