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Building a shed in Welland comes down to two questions: do you need a building permit, and where on the lot can it go. The second one applies even when the answer to the first is no. The permit question. Ontario's Building Code exempts a shed from a permit only if it is not more than 15 m2 (about 161 sq ft), is one storey, is not attached to any building or structure, is used only for storage, and has no plumbing (Division C, Article 1.3.1.1.(6)). Welland's own homeowner guide to accessory buildings, dated March 23, 2018, draws the line lower: "In general a Building Permit is required for all buildings and structures greater than 107 ft2 (10 m2) in area." That guide does not mention the 15 m2 storage-shed exemption, and we could not find a current City page that says which line the Building Division works from today. So here is how it sorts out. Under 10 m2, a 10x10 for example (100 sq ft, about 9.3 m2), both rules say no permit. Over 15 m2, a 16x16 for example, both rules say you need one. Between the two, which takes in a 10x12 (about 11.15 m2) and a 12x12 (about 13.4 m2), call the Building Division before you build rather than guess: 905-735-1700 ext. 2251 or 2257, devserv@welland.ca. The fee. Welland's 2026 building fees list "Garage, deck, shed, and sunroom" at a flat $199, which is also the City's minimum permit fee. Building first and applying later costs more. The 2018 guide lists increased permit fees (a minimum $166.00 extra charge), possible demolition, a possible $400.00 ticket, and a court fine of up to $50,000.00 for a first offence. Those are the guide's 2018 figures, so treat them as a guide, not a current schedule. Where it can go. Welland's Zoning By-law 2017-117 (the consolidation as amended by By-law 2024-99, dated November 5, 2025) sets these for every accessory building, permit or no permit. A shed goes in an interior side yard or the rear yard only (s.5.3.2(a)(i)), which rules out the front yard and, on a corner lot, the side yard along the street. It sits at least 0.9 m from any side or rear lot line (s.5.3.2(a)(ii)) and at least 0.9 m from the house (s.5.3.2(b)). It can be no closer to a street line than the house is required to be, and a detached garage needs at least 5.5 m to a street line (s.5.3.2(a)(iii)). It cannot sit in a required planting strip (s.5.3.2(a)(iv)). In a residential zone it can be no taller than 6.0 m (s.5.3.3). And all accessory buildings and structures on the lot together can cover no more than 10% of it; decks and open-air pools do not count toward that 10% (s.5.3.4(a)). Sea cans. A shipping container is not a shed in Welland. The by-law does not allow a storage container, portable storage unit, intermodal container or a repurposed vehicle as an accessory building outside an industrial zone, and a "sea can" only in the Agricultural A1 zone or an industrial zone (s.5.3.1(a)(iv)-(v)). The one exception is temporary: s.5.7(a) allows a storage container on a construction site only for as long as the work needs it. Building it. The 2018 guide says a building under 55 m2 (592 sq ft) and one storey can sit on wood mud sills or a concrete floating slab instead of a 4-foot-deep foundation, as long as it is not masonry, and that a wall less than 1.2 m from a property line can have no windows or glazed doors. Plan the door side with that in mind if the shed is going near the fence. For how the 15 m2 test plays out in Niagara Falls, St. Catharines and Niagara-on-the-Lake, see /shed-permit-guide/.
Most shed sellers in Niagara build in a shop and deliver a stock size, which is fine for a standard garden shed. Peter builds on-site and to measure instead. That matters more in Welland than you might think: with the shed held 0.9 m off the side and rear lines and 0.9 m off the house, a lot with a narrow back yard often fits an odd size better than a stock one. Size and material choices are covered on /shed-size-material-guide/.
Under 10 m2 (107 sq ft), no. Over 15 m2 (about 161 sq ft), yes. In between, check with the City first. Ontario's Building Code exempts a one-storey, unattached, storage-only shed with no plumbing up to 15 m2, but Welland's 2018 homeowner guide says a permit is "in general" required over 10 m2, and no current City page settles which line applies. Building Division: 905-735-1700 ext. 2251 or 2257, devserv@welland.ca.
Possibly. A 12x12 is 144 sq ft, about 13.4 m2. That is under the Code's 15 m2 storage-shed exemption but over the 10 m2 line in Welland's 2018 guide, so ask the Building Division before you build. A 10x12 (about 11.15 m2) is in the same spot. A 10x10 (about 9.3 m2) is under both.
0.9 m from any side or rear lot line, and 0.9 m from the house (Zoning By-law 2017-117, s.5.3.2). It has to be in an interior side yard or the rear yard, not the front yard, and no closer to the street than the house is required to be.
The by-law sets no count. It caps area instead: every accessory building and structure on the lot combined can cover no more than 10% of the lot, with decks and open-air pools left out of that total (s.5.3.4(a)). A detached garage already on the lot uses up part of the same 10%.
Not in a residential zone. Welland's zoning by-law allows a "sea can" container only in the Agricultural A1 zone or an industrial zone, and other storage containers only in an industrial zone (s.5.3.1(a)(iv)-(v)). A container on site during construction is allowed for as long as the work needs it (s.5.7(a)).
Welland's 2026 building fees list "Garage, deck, shed, and sunroom" at a flat $199, the same as the City's minimum permit fee.
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