Deck Building

A building permit is required in the Town of Milton to build decks meeting these criteria:

  • a freestanding deck greater than 10 m2 (108 ft2)
  • a freestanding deck where the floor is higher than 0.6 m (2 ft) above finished grade at any point
  • any deck attached to a building. 

Follow the process outlined below to ensure that you meet all of the building permit requirements for your deck.

Is your property zoned for deck construction?

Under the Zoning By-law, the location of a deck (and any required stairs) on a property is regulated based on the property zoning and the height of the deck above grade. In addition, the installation of privacy screening on a deck is limited to maximum height of 1.5 m (4'-11") and the combined length of the privacy screen and house wall adjacent to the deck) cannot exceed 60% of the entire deck perimeter.

General Zoning By-law requirements for your property can be obtained by contacting the Zoning Department at (905) 878-7252 ext.2329 or by reviewing the Town of Milton Zoning By-law.

Are you in a new subdivision?

If your subdivision has not been assumed by the Town you will require a developer's clearance letter from the Builder to build your deck. To find out if your subdivision is assumed please contact Engineering Services at (905)878-7252 ext. 2500

Apply for your Building Permit

Complete building permit applications are accepted in person on the 2nd floor of Town Hall at 150 Mary St.  Building permit fees are payable by cash, cheque or debit at the time of application. Building permit fees include the review of drawings and all required inspections. 

Building permit applications require 2 types of submissions:

  1. Permit Application Forms
  2. Construction Drawings

Permit Application Forms 

1. Application for a Permit to Construct or Demolish - All sections of the form must be completed, including the full legal description (which can be found on your deed, tax assessment, survey, or is available from the public computer kiosk located on the main floor of Town Hall next to the Reception area).

2. Schedule 1 Designer Form  - This form is required when someone other than an Architect or Licensed Professional Engineer is taking responsibility for the design of the Deck.

This other person would be either:

  • the homeowner taking legal responsibility for the design, provided they understand and are willing to take responsibility for the applicable requirements of the Ontario Building Code
  • OR 
  • a registered designer with a Building Code Identification Number (BCIN) qualified in House or Small Buildings.  Drawings that are prepared by a registered designer (as defined in the Ontario Building Code) must include:
    • The qualified designer's name
    • The qualified designer’s registration number
    • The qualification identification number of the qualified designer (Building Code Identification Number: BCIN)
    • The qualified designer's signature
    • The stamp or statement that the qualified designer has reviewed and taken responsibility for the design activities. 

Construction Drawings

The following construction drawings are required for a Deck:

  1. Site Plan (Sample D-1)
  2. Deck Structural/Floor Layout (Sample D-2)
  3. Deck Section & Details (Sample D-3)

Sample Drawings

Refer to the enclosed sample drawings for specific drawing requirements, including the number of copies of each drawing required. Sample D-4 includes acceptable deck footings options as well as tables for sizing footings, joists and beams. Where steel helical pier/piles are used additional drawings and documentation is required (see Sample D-4).

Deck design printouts from large box stores are not acceptable construction drawings, and must be redrawn to meet the requirements shown in the sample deck construction drawings.

If any proposed guard components (post, top/bottom rail, baluster, etc.) are not wood, the drawings must include connection/construction details stamped by a Professional Engineer Licensed to practice in Ontario. These details are typically available from supplier or manufacturer’s websites. In addition, any privacy screen (wood or other material) that also serves as guard must be designed by a Professional Engineer. 

Drawing Submissions

  • Digital drawings are preferred, however paper submission is also accepted
  • Create 1 physical copy of the Site Plan or one digital copy.
  • Digital files must be in PDF format and generated directly from the software used to create them (AutoCAD, Softplan, Revit, etc.) using a PDF printer or converter (no scanned copies).
  • Digital PDF files must have the document properties/restrictions/security settings/permissions set to allow, “Printing” and “Adding Markups”.
  • Submit on CD, DVD, or USB flash drive in person at the time of building permit application.
  • All paper drawings must be submitted in black and white (min. 2 copies of all), drawn to an appropriate scale (min 3/16” = 1’ or metric equivalent), and clearly legible. Drawings in pencil shall be photocopied prior to submission, with the density adjusted so that all information is clear and legible.  Drawings must clearly differentiate between existing and proposed construction. Every page drawing shall include the project address and the designers information.

Book your Inspections

Typical Deck inspections can include (depending on the scope of work):

  • Footing
  • Framing
  • Final Building

Inspections are booked online or by calling the Building Division at (905) 878-7252 ext. 2396.

Rates and Fees

  • Typical homeowner related permit fees see our Residential Permit fees page.
  • For the complete list of Building Permit fees see our Rates and Fees by-law page.
  • All fees are required at the time of Permit Application (acceptable forms of payment include, Cash, Debit or Cheque).
  • Other charges may also apply.