Shed Permit Guide in Niagara Region, Ontario

Here is the shed permit question, in order. Step 1: check the footprint against 15 m2 (about 161.5 sq ft). Ontario's shed exemption is a specific, five-condition test -- Ontario Building Code, Division C, Article 1.3.1.1.(6) -- quoted here verbatim, since almost nothing else online cites the actual article: a shed is exempt from the permit requirement only if it (a) is not more than 15 m2 in gross area, (b) is not more than one storey in building height, (c) is not attached to a building or any other structure, (d) is used only for storage purposes ancillary to a principal building on the lot, and (e) does not have plumbing. The same sentence goes on to say what passing gets you: such a shed "is exempt from the requirement to obtain a permit under section 8 of the Act and is exempt from compliance with this Code". That second half is why, for a small shed, the town zoning rules in Step 4 are what is left to check. At more than 15 m2, a building permit is required, no matter the other four conditions. This article lives in the CURRENT Building Code, adopted by O. Reg. 163/24 s.1: the National Building Code of Canada 2020, as amended by "Ontario Amendments to the National Building Code of Canada 2020", now the edition dated October 1, 2026 under O. Reg. 325/26, which this page has not yet re-checked; it was checked against the July 17, 2026 edition put there by O. Reg. 242/26. The predecessor regulation, O. Reg. 332/12, was revoked January 1, 2025, but this exemption's text carried over unchanged, at the same article number, into the current edition. One correction to how this is sometimes summarized elsewhere: condition (e) is plumbing ONLY -- hard-wired electrical is NOT part of this exemption test. Adding electrical does not, by itself, remove the building-permit exemption, but it does trigger its own separate approval through the Electrical Safety Authority, a different process from this permit exemption. Step 2: check the other four 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, 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 four conditions hold. A 10x12 shed (120 sq ft, 11.15 m2) also falls under the 15 m2 threshold -- this is the exact size where the shed-vs-not-shed line first matters: as a storage-only shed it is exempt (subject to the other four conditions), but if that identical 11.15 m2 footprint were used for anything other than storage -- a gazebo, a bunkie, a small workshop -- it would fail condition (d), lose the shed exemption entirely, and fall back to the Building Code Act's own 10 m2 definition of a "building," which it exceeds. Same footprint, opposite answer, depending on use. A shed sized 16x16 (256 sq ft, well over 15 m2) or larger needs a permit outright. Step 4: check zoning setbacks, height rules, AND cumulative lot coverage -- even if you are permit-exempt. Being under 15 m2 exempts you from the building-permit requirement, not from these three separate zoning tests, and none of them are answered by the 15 m2 shed test above. Here are the real numbers, not just a "check with your municipality" deferral. In Niagara Falls, Zoning By-law 79-200, s.4.13 (urban zones; the rural and open-space zones fall under s.4.13.1-4.13.3 instead), sets an accessory-structure setback of 0.45 m from any lot line in a rear yard, 1.2 m from an interior side lot line, and 4.5 m from the side lot line abutting a street or reserve on a corner lot, plus a maximum height of 3 m to the walls or supporting posts (4.6 m to the peak of a pitched roof). In St. Catharines, By-law 2013-283, s.2.1, sets 0.6 m from an interior side or rear lot line for a structure 4.5 m tall or under (1.2 m if taller), and a maximum height of 4.5 m to the walls (6 m to the peak). In Niagara-on-the-Lake, By-law 4316-09, s.6.1, sets 1.2 m from the main building and a maximum height of 6 m to the peak. On distance from the house: Niagara-on-the-Lake's 1.2 m is s.6.1(a)(2), and Welland sets 0.9 m from the house (Zoning By-law 2017-117, s.5.3.2(b); see /welland-shed-guide/). Niagara Falls' s.4.13 and St. Catharines' s.2.1 give no separate distance from the house, so ask the City before you set a shed right beside it. None of Niagara Falls, St. Catharines or Niagara-on-the-Lake generally allows an accessory building in a front yard. And there is a THIRD test beyond setback and height, one this page has never named until now: all three towns cap how much of the WHOLE lot every accessory building and structure combined -- not just this shed -- may cover. Niagara Falls: 15% of the lot area or 93 m2, whichever is lesser, in its R1A-R1F, R2 and R3 zones (s.4.13(g)). St. Catharines: 10% of the total lot area, excluding in-ground pools (s.2.1(c)). Niagara-on-the-Lake: 8% of the lot area, for lands inside its urban boundary only -- Virgil, Old Town, Queenston, St. Davids, and Glendale (s.6.1(a)(1)); rural NOTL uses a different by-law this page does not cite a figure from. That cumulative cap is the honest answer to a different, more common question than "is this one shed under 15 m2": there is usually no fixed COUNT limit on how many sheds a property may have, but there is very much a coverage limit, and an existing garage or shed already on the lot counts against the same cap a new one would use up. See /permit-guide/ for the same figures in the site's full per-municipality context. Step 5: confirm with your own municipality before you build, and take one caveat with you. Welland's 2018 homeowner guide draws the permit line lower than the Code does, at 107 ft2 (10 m2), and does not mention the 15 m2 storage-shed exemption. St. Catharines' older accessory buildings guide says the same at 108 ft2 (10 m2), but the City's current "Do I need a Building Permit" page lists "accessory buildings such as sheds that are more than 15 m2", matching the Code. A shed under 10 m2 is clear either way. If yours falls between 10 and 15 m2 in Welland, a 10x12 or a 12x12 for example, ask the City which line it applies before you build. Niagara Falls' own accessory-buildings page states the 15 m2 storage-only test for detached, semi-detached and row homes. If you do need a permit, the 2026 fees are: Niagara Falls, $7.55 per m2 for an "Accessory Building (garage or shed)" with a $243.00 minimum permit charge; St. Catharines, $1.64 per sq ft before surcharges on the row its fee by-law labels "Each attached garage or carport, shed, decks, open porch, balcony", with a $185.80 minimum; Welland, a flat $199 (see /welland-shed-guide/ for Welland's setbacks and its sea-can rule). Each town runs its own building department, so the exempt-or-not answer above is the Ontario-wide starting point, not a substitute for checking locally.