Residential additions

Building a residential addition

As a home owner, you’re allowed to prepare the drawings for your project.  However, you’ll need to be familiar with any codes and by-laws applicable to your project.

Additions can be quite complex, and often require the services of a qualified designer.  If you’re not familiar with the Building Code, or any applicable by-laws (including the Zoning By-law), you may need to hire a qualified designer.

Zoning regulations

The zoning by-law regulates the use of land, including the distance required to property lines.  Consulting with Zoning Services staff is recommended prior to applying for a building permit in order to confirm all zoning requirements are being met. Zoning Services can be reached by email at or by calling 519-837-5615.

Applying for a building permit


An Application for a Permit to Construct or Demolish is required to be submitted with every building permit application.  All four pages are required to be completed.  The person taking responsibility for the design is required to complete page three. (Schedule 1: Designer Information)  This is typically the qualified designer, or in some cases, the home owner.

An Energy Efficiency Design Summary (EEDS) form is also required to be submitted.  This form is typically completed by the designer.


All drawings must be drawn to a recognized scale (e.g.: ¼” = 1’-0”) and dimensioned to the outside of exterior walls.  Single line drawings will not be accepted.

The following drawings are required to be submitted:

  • A survey or site plan illustrating the lot width and depth, the location of the proposed addition (including setbacks to property lines), the size of the addition, and all existing buildings or structures on the property
  • Foundation plan of the addition and the existing house
  • All floor plans of the addition and the existing house
  • Roof framing plan or truss layout of the addition
  • Engineered floor system layout (if applicable)
  • All elevations
  • Building and/or wall section(s)


All building permit fees are required to be paid when the application is submitted.

Read more on Building Permits