The nice weather is here, and it's easy to picture yourself lounging on a deck in your own backyard. Summer is short around here, so it's worth making the most of it. But if you're planning to build a new deck or repair an existing one, you may be wondering whether you need a building permit first. Renovating or replacing projecting structures like decks means complying with your municipality's bylaws, and in many cases, that means pulling a permit. Here's what to know about building or repairing terraces, balconies, porches, and decks.
Maintenance and minor repairs
In most cases, no permit is needed just to maintain or repair an existing terrace, balcony, porch, or deck. That said, if you plan to use different materials than the originals for the repair, it's important to notify the city and get proper utility locates first — ideally before you even buy materials, especially if any digging is involved. Every municipality has its own rules, and the last thing you want is to be told to take apart work you just finished.
Construction, modification, and replacement
Building, enlarging, modifying, or replacing a terrace, balcony, deck, or porch almost always requires a permit before work starts, with only rare exceptions. Several things get checked in the process: the distance between your structure and the property line, its dimensions, how high the floor sits above the ground, guardrail height, spacing and orientation of the rails, approved screen and material types, the number of balconies allowed per facade, and the size and number of windows underneath the structure.
Generally, you don't need a permit for a terrace, balcony, porch, or deck under 60 cm (24 inches) in height above the ground. Anything taller typically requires a scaled plan with elevations and sections, along with the information needed to confirm compliance with local regulations. If the work is happening at a condominium, you'll also need written authorization from every co-owner, or a resolution from the condo corporation.
Either way, it's worth checking with your city or a qualified contractor before you start — they can walk you through the exact steps needed to get the deck you're picturing done right.