Ottawa's 2024 garden suite reforms unlocked thousands of properties for detached secondary suite construction. This guide covers what's permitted as-of-right vs requires Minor Variance, by R-zone, with 2026 setback and height rules.
A garden suite is a self-contained detached dwelling unit on a residential lot, separate from the main house. Garden suites differ from coach houses (which are above a garage) and laneway houses (which face a rear lane). Ottawa's 2024 zoning by-law updates allow garden suites as-of-right on most R1, R2, R3, and R4 lots, subject to setback, height, and lot coverage rules.
Rear yard setback: 1.2m minimum from rear lot line (one-storey suite); 2.5m (two-storey). Side yard setback: 1.2m minimum from side lot line. Separation from main house: 5m minimum (allows fire access, light/air). Front yard: garden suites cannot be in the front yard (rear-yard placement only). Corner lots: additional flanking street setback typically 3m.
Maximum size: 80m² (860 sq ft) gross floor area for as-of-right approval. Larger possible via Minor Variance. Maximum height: 4m (one-storey, flat roof); 5.5m (one-storey, pitched roof); 6.7m (two-storey). Building footprint counts toward total lot coverage limit (typically 50-55% for R1 zones). Minimum lot size for garden suite: varies by zone — typically 360m² for R1 lots, lower for R2/R3.
Permitted: residential occupancy (primary dwelling, secondary suite, rental). Not permitted: short-term rental in some specific zones (verify; STR bylaw also applies). Owner does not need to occupy main house or garden suite. Both main house and garden suite can be rented separately. Up to one additional secondary suite WITHIN main house is also permitted (so a single lot can have main house + interior secondary suite + garden suite = 3 dwelling units).
As-of-right: meets all standard zoning rules (setbacks, height, size, lot coverage). Permit process: building permit only, 6-12 weeks. Minor Variance: exceeds one or more standard rules by minor amount (e.g., 90m² instead of 80m², 1.0m setback instead of 1.2m). Process: Committee of Adjustment application ($1,200-$2,500 fee, 4-6 months to decision) + building permit. Major variances (significantly exceeding standards): often denied or require formal zoning amendment ($5K+ fees, 8-14 months).
Building permit ($1,800-$5,500 typical for garden suite). Electrical permit (ESA). Plumbing permit. Heritage permit if in heritage district (most heritage districts now allow garden suites with design review). Conservation Authority permit if lot is in regulated area (waterfront, flood plain, ravine). Tree preservation: lots with significant trees often require arborist report ($800-$2,500) and tree protection during construction.
Yes — Ottawa's 2024 zoning by-law updates permit garden suites as-of-right on most R1, R2, R3, and R4 residential lots subject to setback, height, and size limits. Approval is a standard building permit process (6-12 weeks) if your project meets all zoning rules.
Maximum 80m² (860 sq ft) gross floor area for as-of-right approval. Larger possible via Minor Variance through Committee of Adjustment ($1,200-$2,500 application fee, 4-6 month timeline). Two storeys up to 6.7m height permitted.
Rear: 1.2m (one-storey) or 2.5m (two-storey). Side: 1.2m. Separation from main house: 5m minimum. Front yard placement prohibited. Corner lots typically need 3m flanking street setback.
Yes — building permit always required ($1,800-$5,500 typical fee). Plus electrical (ESA), plumbing, and HVAC permits. If project requires variance, Committee of Adjustment approval needed before building permit.
Yes — long-term rentals are permitted on all garden suites. Short-term rental (Airbnb) is restricted by Ottawa's STR bylaw — generally only permitted if it's the operator's principal residence. Verify STR rules separately.