Building Permits


Building Department

395 Mulock Drive, Newmarket,

905-953-5300 x 2400

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​​​​​​​​​​​​​The Ontario Building Code requires that you obtain a Building Permit before you start work on a new house, an addition or any significant alterations to an existing house. The Building Code sets out the minimum requirements for such work and is particularly concerned with your health and safety and that of other homeowners, building occupants, future owners and the community.

​Forms​Documents​Helpful Links

​When do I ne​ed a permit?​

Permits are normally required when:

  • Building any detached structure larger than 108 square feet​
  • Building any additio​​​n to your home
  • Raised porches or decks
  • Carports or garages
  • Structural alterations
  • Moving or lifting your house
  • Installing a wood stove or fireplace
  • Partitioning a basement or adding a basement entrance
  • Creating an apartment in your house
  • Altering or adding any plumbing
  • Demolishing a house

When are permits not usually required?

  • Detached structures 108 square feet or less in an area
  • New non-load bearing interior walls, floor or ceiling finishes
  • Repairs to chimneys, porches, decks or roofs
  • Waterproofing repairs to basement (no plumbing involved) 
  • Replacement of furnace (no building alterations) 

View our 'How to obtain a Building Permit' page for more information on applying for a Building Permit.