The Ottawa Zoning By-law 2008-250 is the single document that controls what you can — and cannot — build on your property. Before you finalize an addition, plan a secondary suite, replace a fence, or buy a property with renovation intent, you need to know its zone, its setbacks, its height limit, and its permitted uses. This guide translates the by-law into plain English, walks through the official City of Ottawa zoning map (GeoOttawa), and gives you a printable quick-reference you can keep at the kitchen table during your project. We've also linked our free printable Ottawa zoning quick-refer...
Open the GeoOttawa map at https://maps.ottawa.ca and search your municipal address. Click your parcel — the side panel shows your zone code (e.g., R1FF, R2G[1234], R4UC[H(11.0)]). The bracketed numbers are 'exception zones' that modify the base rules. The text in square brackets after the H is your specific height limit in metres. If your panel shows an overlay (heritage, mature neighbourhoods, infill 1, infill 2, urban design priority area), each carries additional rules layered on top of the b...
Zone codes follow a pattern: family letter (R = residential, I = institutional, AM = arterial main street, GM = general mixed use), density number (1 = lowest, 5 = highest), and optional subzone letter that fine-tunes setback and lot size requirements. R1 is single-detached only on larger lots. R2 a...
Three overlays catch most homeowners off-guard. (1) Mature Neighbourhoods Overlay — covers central Ottawa neighbourhoods built before 1945 and triggers tighter front-yard setbacks, building height tied to neighbour average, and design review for new builds. (2) Heritage Conservation District — cover...
R1 — single-detached dwelling, secondary dwelling unit (basement or detached coach house, subject to setbacks), home-based business at limited scale, group home (small). Minimum lot size varies by subzone from 360 m² to 1,000 m². R2 — everything R1 plus duplex (two units stacked or side-by-side). R3 — everything R2 plus townhouse (up to 4-6 units in a row), planned unit development, three-unit dwelling. R4 — everything R3 plus low-rise apartment building (up to ~4 storeys, exact limit set by H n...
Setbacks are the minimum distance from your property line to any building. For most R1 lots: front-yard 6.0 m (often less in mature neighbourhoods, based on neighbour average), rear-yard 7.5 m or 25% of lot depth (whichever is less), interior side-yard 1.2 m on one side and 0.6 m on the other for lots ≤12.0 m wide, 1.2 m both sides for lots 12.0-15.0 m wide, and 1.5 m+ for wider lots. Corner-lot exterior side-yard is typically 3.0 m. Decks more than 0.6 m above grade need full setbacks; ground-l...
Standard R1 height limit is 8.0 m measured from average grade. R2 generally allows 8.5-9.5 m. R3 ranges 11.0-14.5 m. R4 height is specified in the zone code (e.g., R4UC[H(11.0)] = 11.0 m maximum). Mature neighbourhoods cap height at the average of the two neighbouring buildings — a hard cap that fre...
As of 2020, every residential zone in Ottawa permits a secondary dwelling unit by-right (no rezoning required) — either inside the main dwelling (basement apartment, in-law suite) or as a detached coach house in the rear yard. Coach house rules: maximum 80 m² floor area or 40% of main dwelling, whichever is less; maximum height 6.7 m; minimum setbacks 1.2 m from rear and side property lines; one parking space required (can be tandem); separate utility services optional but recommended. The Canad...
When your project violates the by-law in a minor way (e.g., setback 0.3 m short, height 0.5 m over, lot coverage 2% over), apply for a minor variance through the Committee of Adjustment. Application fee: $1,800 in 2026. Hearings happen monthly. You'll need a complete site plan, architectural drawings, written explanation against the 'four tests' (minor in nature, desirable, maintains by-law intent, meets Official Plan intent), and notice to neighbours within 60 m. Typical approval rate for well-...
(1) Building a deck assuming the by-law setback is 0.6 m when it's actually 4.0 m because the deck is over 0.6 m above grade. (2) Adding a third storey in a mature neighbourhood without realizing the height cap is tied to neighbour average. (3) Adding a secondary suite in a property with insufficient parking. (4) Installing a fence taller than 2.13 m in a rear yard without an over-height fence permit. (5) Building an accessory structure (shed, gazebo) in the front yard. (6) Operating a home-base...
Go to https://maps.ottawa.ca (GeoOttawa), search your address, click the parcel, and your zone code appears in the side panel. The code combines a family letter (R = residential), density number (1-5), optional subzone letter, and any exception numbers in square brackets.
R1 permits single-detached dwellings, one secondary dwelling unit (basement or coach house), small-scale home-based business, and small group homes. Duplexes, townhouses, and apartments are NOT permitted in R1 without a rezoning application.
As of 2020, every residential zone permits a coach house by-right, subject to size limits (80 m² max or 40% of main dwelling), height limit (6.7 m), setback rules (1.2 m rear and side), and one required parking space. Lot must be physically large enough to accommodate the structure and setbacks.
It is the city-wide by-law adopted in 2008 that establishes every zone, every permitted use, and every dimensional rule for development on private property in Ottawa. The full text and amendments live at ottawa.ca/zoning and on the city's GeoOttawa portal.
A minor variance is an approval from the Committee of Adjustment that lets your project deviate slightly from the zoning by-law. Application fee is $1,800 in 2026, hearings happen monthly, and you must demonstrate the four tests: minor in nature, desirable for the property, maintains the by-law's general intent, and meets the Official Plan's intent.