A site plan is the first sheet of an Ontario building permit package and is required for a complete application under OBC Div C 1.3.1.3. Setbacks, lot coverage, and building height are municipal zoning — not the OBC. The OBC's own property-line rule is spatial separation: under a 1.2 m limiting distance a house wall may have no unprotected openings and needs a 45-minute fire-resistance rating (OBC 9.10.15; non-combustible cladding is added only under 0.6 m). A shed up to 15 m² is permit-exempt under OBC Div C 1.3.1.1.(6), though most municipalities require a permit over 10 m². A Class 4 septic leaching bed sits 15 m from a drilled well and 3 m from a property line (OBC Table 8.2.1.6.-B). Pool fencing is a municipal pool-enclosure by-law, not the OBC — Part 9 section 9.40 is Reinforced Concrete Slabs.
The first page of any residential permit package is the site plan. Every plans examiner in Ontario opens the folder, flips past the cover sheet, and looks at the site plan first. If the site plan is wrong, the rest of the drawings do not matter — the application comes back incomplete and the clock under OBC Div C 1.3.1.3 does not start. Here is what a site plan actually has to carry, what the OBC says about it, and what your municipality is going to say on top.
A complete site plan under OBC Div C 1.3.1.3 is a scaled top-down drawing of the lot. At the minimum the reviewer wants: every property line, dimensioned to two decimals of a metre (or to the nearest half-inch imperial); the front, rear, and side setbacks dimensioned from every existing and proposed building face to the nearest property line; every existing structure on the lot — house, attached and detached garage, shed, deck, porch, pool, driveway, walkway, septic tank, leaching bed, well, even the shed you forgot about in the back corner; the proposed structure drawn in a clearly contrasting style (hatched, shaded, or bolder line); a north arrow; the drawing scale and a scale bar so a PDF printed at the wrong size still reads correctly; a title block naming the owner, municipal address, legal description (Lot / Concession / Plan 12M-XXXX), the zoning designation, and the drawing date. Many municipalities also want the existing and proposed grades at each corner of the lot, the locations of any easements or rights-of-way, and the driveway culvert detail if the lot abuts a rural road.
A lot of first-time applicants treat "permit rules" as one big pile. They are not. The Ontario Building Code (OBC) is a provincial construction standard — how thick the footings, how tall the guards, how far apart the studs. The zoning by-law is a municipal land-use document — where on the lot you can put the house, how close to the street, how tall, how much of the lot the roofs can cover. Both documents apply to every permit. The plans examiner will check both. The Plot Plan Builder keeps them separate by design. Setbacks, lot coverage, and maximum height are entered as zoning values because that is what they are — your municipality's numbers. The tool then applies the OBC checks on top: accessory-structure exemption under Div C 1.3.1.1.(6), spatial separation under 9.10.14 and 9.10.15, and septic clearances under 8.2 (Table 8.2.1.6.-B). Pool-enclosure fencing is checked against the municipal pool-enclosure by-law — the OBC does not regulate residential pools. Each check is labelled with its source so the plans examiner can see where the number came from.
Every Ontario municipality publishes its zoning by-law online. Search for "[your city] zoning by-law" and the first hit is usually the official document plus a zoning map. Residential zones are numbered — R1 is typically the largest lot with the deepest setbacks, R2 and R3 tighten as density increases, and rural and agricultural zones have their own numbers (RU, A1, A2). Read your lot's zone off the map, then find the corresponding row in the zoning schedule. Typical Ontario residential setbacks fall in these ranges — but check yours before you design: R1 front 6 m / rear 7.5 m / side 1.5 m; R2 front 4.5 m / rear 7.5 m / side 1.2 m; rural front 15 m / rear 7.5 m / side 4.5 m. Corner lots get two front yards. Lots under the minimum frontage are undersized and may need a minor variance or extra relief. Accessory structures — sheds, detached garages, pool houses — usually have their own relaxed setback section; that is where a shed can legally sit at 0.6 m from the rear property line even though the house has to sit 7.5 m off.
Lot coverage is the percentage of the lot covered by buildings when viewed from above. The zoning cap is typically 30–45% in Ontario residential zones. Driveways and walkways usually do NOT count; decks over a certain height sometimes do. The trap is that every existing structure counts. A 1960s bungalow with a detached garage, an attached porch, and a backyard shed can already be at 32% coverage before you draw a new addition. Adding a 400 sq ft addition on a 4 500 sq ft lot adds almost 9 percentage points — you are at 41% and the zoning cap was 40%. Minor variance, six weeks of delay, public notice to the neighbours, committee of adjustment fee. The Plot Plan Builder shows a live coverage readout as you place each structure so you can see the cap approaching before you commit to drawings.
Section 9.10.14 (general) and 9.10.15 (houses) of the OBC set the fire-safety rules on how close a wall with windows can sit to a property line. Under a 1.2 m limiting distance the exposing building face may have no unprotected openings — Table 9.10.15.4 reads 0% at that distance — and has to carry a 45-minute fire-resistance rating (OBC 9.10.15.5). Non-combustible cladding (stucco, fibre cement, brick, metal) is only required once the limiting distance drops below 0.6 m; between 0.6 m and 1.2 m the 45-minute rating alone satisfies 9.10.15.5.(1.1). From 1.2 m up, the permitted glazed-opening percentage grows with the limiting distance squared — roughly 8% at 1.5 m, 21% at 2.5 m for a small face — and beyond about 2.5 m most residential lots are in the clear. This is not a zoning rule — even if the zoning setback lets you build at 1.0 m, the OBC will not let you put a window on that wall. The Plot Plan Builder auto-flags any proposed structure within 2.5 m of a property line and cross-links to the dedicated OBC Spatial Separation tool for the full Table 9.10.15.4 lookup.
Rural lots on private services — well water in, septic bed out — have their own clearance matrix in OBC Division B Table 8.2.1.6.-B (minimum clearances for the distribution piping and leaching chambers of a Class 4 leaching bed). The numbers the plans examiner checks hardest: the tile bed sits at least 15 m from a drilled well (watertight casing to a depth of at least 6 m), 30 m from any other well, 15 m from a lake, river, stream or spring, 5 m from any structure, and 3 m from a property line. Small rural lots often cannot meet 15 m to the well plus 3 m to the property line plus 5 m to the house while still respecting the zoning side setbacks — that is why infill on small rural lots frequently needs a holding tank (Table 8.2.1.6.-C) or a tertiary treatment unit rather than a conventional tile bed. Enable the rural / septic & well option on Step 1 and the tool runs the clearance checks as soon as you place the bed, the tank, and the well.
No — and this trips people up. The OBC regulates only public pools (Division B Section 3.11), and its scope explicitly excludes pools serving fewer than six dwelling units. Your backyard pool is not in the OBC. Residential pool fencing is set by the municipal pool-enclosure by-law, passed under section 7 of the Building Code Act, 1992. Do not cite "OBC 9.40" for a fence — Part 9 section 9.40 is Reinforced Concrete Slabs. What the municipal by-law typically requires is consistent across Ontario: any pool that can hold water more than about 60 cm deep needs an enclosure at least 1.2 m high (many municipalities bump to 1.52 m / 5 feet), a gate that is self-closing and self-latching with the latch at least 1.5 m off the ground, no opening in the fence greater than 100 mm so a small head cannot pass, and no climbable horizontal rails on the pool side. The by-law usually adds a separate pool-permit application and an inspection before the pool can be filled. Above-ground pools with wall height over 1.2 m sometimes count as their own enclosure — that is a local call. Call your municipality before the truck shows up.
OBC Division C 1.3.1.1.(6) exempts a storage shed from the building permit if it is 15 m² or less, one storey, detached, used only for storage, and has no plumbing. That is the OBC giving you relief. Every Ontario municipality, however, tightens that in practice. Most draw the line at 10 m² (108 sq ft) even though the OBC exempts up to 15 m². Zoning setbacks still apply to every shed. Any plumbing, heating, or use as a workshop / bunkie / pool house voids the exemption. Detached garages always require a permit — no exemption. When the tool flags a shed over 10 m² it warns you that you are in the OBC-exempt-but-often-municipally-permitted zone, and it flags a shed over 15 m² as permit required with the citation.
Plans examiners see the same mistakes every week. Setbacks dimensioned to the wrong feature (the fence, the sidewalk, the edge of the garden bed — not the actual surveyed property line). No scale bar on the drawing, so when the PDF prints at 92% the dimensions no longer work. Missing existing structures (the plans examiner pulls the aerial photo and sees the garage that is not on your plan). Driveway not shown. Septic not shown on rural lots. No legal description. North arrow missing. Title block without the zoning designation. Proposed and existing drawn in the same style so the reviewer cannot tell them apart. The Plot Plan Builder is designed to avoid all of those — it produces a two-page printout with title block, legend, north arrow, scale bar, clearly differentiated existing (grey) and proposed (blue hatched) structures, and a compliance checklist citing the exact OBC clauses the tool checked against.
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Verified against the Ontario Building Code 2024 (O. Reg. 163/24, January 16, 2025 amendment) — Division C 1.3.1.1.(6), 1.3.1.2, 1.3.1.3; Division B 8.2 (Table 8.2.1.6.-B), 9.10.14, 9.10.15. Setbacks, lot coverage, height, and residential pool-enclosure fencing are municipal by-law, not OBC-published (Part 9 section 9.40 is Reinforced Concrete Slabs). Last verified 2026-04-21 by a Red Seal Carpenter (Ontario Certificate of Qualification).
Per OBC Div C 1.3.1.3, a complete site plan shows: lot boundaries with dimensions, front/rear/side setbacks dimensioned to every property line, ALL existing structures (house, garage, shed, deck, driveway, septic, well) with dimensions, proposed structures in contrasting style, a north arrow, drawing scale (typically 1:200 or 1:250 metric), and a title block with address, owner, zoning, and date.
By the ToolFluency team · Updated July 2026
Free wizard that builds a scaled, printable site plan + material list for an Ontario building permit: lot dimensions, zoning setbacks, existing + proposed structures, live OBC checks. Verified against OBC 2024 (Div C 1.3.1.1.(6) shed exemption, 8.2 Table 8.2.1.6.-B septic, 9.10.14/9.10.15 spatial separation). Pool fencing flagged as municipal by-law.
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