Request a Free QuoteNiagara Region, Ontario · LANE: SHED PERMIT GUIDE
Fence and Deck Building & Repair Experts
Here is the shed permit question, in order. Step 1: check the footprint against 15 m2 (about 161.5 sq ft). In Ontario, a shed is generally permit-EXEMPT only if it meets all four conditions together: (1) up to 15 m2 in footprint, (2) one storey, (3) standalone, not attached to the house or another structure, and (4) storage-only (ancillary use), with no plumbing and no hard-wired electrical. At 15 m2 or larger, a building permit is required, no matter the other three conditions. Step 2: check the other three conditions. A shed under 15 m2 that is two storeys, attached to the house or another structure, or used for anything beyond storage (or fitted with plumbing or hard-wired electrical) is not exempt just because it is small. Step 3: run the worked examples against your own plan. A 10x10 shed (100 sq ft) and a 12x12 shed (144 sq ft, about 13.4 m2) both fall under the 15 m2 threshold and are usually exempt if the other three conditions hold; a shed sized 16x16 (256 sq ft, well over 15 m2) or larger needs a permit outright. Step 4: check zoning setbacks and height rules even if you are permit-exempt. Being under 15 m2 exempts you from the building-permit requirement, not from zoning setback or height rules, which still apply. Step 5: confirm with your own municipality before you build. Niagara Falls, St. Catharines, and Niagara-on-the-Lake each administer their own building department and process, so the exempt-or-not answer above is the Ontario-wide starting point, not a substitute for checking locally.
This page walks through the permit-exemption test step by step; it does not cover material choice or cost. Most Niagara shed sellers build shop-built or prefab sheds off-site and deliver them, a good fit for a standard stock-size garden shed. Peter builds on-site and custom instead, the better fit when a shed is larger, attached to an existing structure, garage-scale, or otherwise doesn't match a delivered model's stock dimensions -- see the sheds page for that full comparison.
Up to 15 m2 (about 161.5 sq ft), as long as it is also one storey, standalone (not attached to your house or another structure), storage-only, and has no plumbing or hard-wired electrical. At 15 m2 or bigger, you need a building permit regardless of the other conditions. Zoning setbacks and height rules apply either way.
Usually no. A 10x10 shed is 100 sq ft, well under the 15 m2 permit-exempt threshold, so it is typically exempt if it also meets the other three conditions: one storey, standalone, and storage-only with no plumbing or hard-wired electrical.
Usually no. A 12x12 shed is 144 sq ft (about 13.4 m2), still under the 15 m2 permit-exempt threshold, so it is typically exempt if it also meets the other three conditions. Zoning setbacks still apply. Check those with your municipality before building.
Yes. A 16x16 shed is 256 sq ft, well over the 15 m2 exemption threshold, so it needs a building permit regardless of the other three conditions.
Yes. Even a shed under 15 m2 loses its permit-exempt status if it has hard-wired electrical or plumbing, or is used for anything beyond storage. All four conditions (footprint, one storey, standalone, storage-only with no plumbing/hard-wired electrical) have to hold together for the exemption to apply.
FRESHNESS Last reviewed:
The shop