In Ottawa, building a garage typically costs $35,000 to $60,000 for a single-car detached garage and $45,000 to $95,000 for a standard two-car detached garage in 2026 — roughly $130 to $260 per square foot finished. A basic 12' x 22' single bay with a slab, vinyl siding, and one overhead door lands near the low end, while a 24' x 24' two-car build with a full frost-wall foundation, insulation, drywall, heat, and matching exterior finishes pushes toward the top. Attached garages generally cost 10–20% more per square foot than detached because they tie into the house structure, roofline, and oft...
The clearest way to budget is by finished square foot, which in Ottawa for 2026 runs about $130 to $260 depending on foundation type and finish level. A single-car detached garage of roughly 12' x 22' (264 sq ft) typically costs $35,000 to $60,000 built. A standard two-car detached garage at 20' x 20' or 24' x 24' (400–576 sq ft) generally runs $45,000 to $95,000. Oversized three-car or workshop-depth builds of 700+ sq ft commonly land between $95,000 and $150,000. Attached garages carry a 10–20...
Two identical footprints can differ by $30,000. Foundation type, roof pitch and shingle choice, siding material, insulation and drywall, electrical service, and whether the garage is heated account for most of the spread between a low and high quote.
Foundation is the single biggest local cost variable. Ottawa's frost depth is roughly 1.5 metres (about 5 feet), so any foundation that supports the structure must reach below it or sit on an engineered frost-protected design. A floating or thickened-edge slab is the least expensive option at roughly $9,000 to $18,000 for a two-car footprint and is common for unheated detached garages. A full frost-wall foundation — poured footings and walls down to 4–5 feet with a slab inside — runs about $18,0...
A building permit is required in Ottawa for any accessory building over 15 square metres (about 161 sq ft), which means essentially every garage. Permit fees for a residential detached garage typically run $300 to $900 depending on size, and you should budget another $1,500 to $4,000 if a site plan, lot grading plan, or drawings need to be prepared by a designer. Ottawa's Zoning By-law also caps how much of your rear yard accessory structures can occupy, sets maximum heights (commonly around 4.5...
Expect City inspections at footing, framing, and final stages. Your contractor should schedule these; delays between inspection bookings are a normal part of the six-to-twelve-week build timeline.
The shell price rarely includes the finishing that makes a garage genuinely usable through an Ottawa winter. Running a sub-panel and circuits to a detached garage — including the trench, buried feeder, and ESA inspection — typically adds $3,500 to $8,000, more if the run from the house panel is long or has to cross a driveway. Spray foam or batt insulation with drywall and paint runs about $6,000 to $14,000 for a two-car space. Heating options range from a $1,500 to $3,500 gas or electric unit h...
Detached garages are usually the lower-cost route per square foot because the crew builds a freestanding box without touching the existing house. Attached garages cost more upfront — tying into the home's wall, roof, and often its heating and electrical — but they're more convenient in January and can add more resale value in family neighbourhoods like Barrhaven or Orleans. Prefabricated or kit garages advertise attractive shell prices of $15,000 to $30,000, but that figure almost never includes...
The figures above are planning ranges — your real number depends on your lot, soil, and finish choices. When requesting quotes, provide your intended dimensions, whether the garage is detached or attached, whether you want it heated and insulated, the number and size of overhead doors, and how far the garage sits from your electrical panel. A good quote will separate foundation, framing and shell, roofing, siding, doors, electrical, insulation, permits, and site restoration as individual line it...
In 2026, building a garage in Ottawa typically costs $35,000–$60,000 for a single-car detached garage and $45,000–$95,000 for a two-car detached garage, which works out to roughly $130–$260 per finished square foot. Attached garages run about 10–20% more per square foot.
Across Ontario, a standard two-car detached garage generally costs $45,000–$95,000 in 2026. Ottawa sits in the middle of that range, though the region's 1.5-metre frost line and snow-load requirements add cost to the foundation and roof framing compared with milder parts of the province.
A 20' x 20' to 24' x 24' two-car detached garage in Ottawa typically costs $45,000–$95,000 built. The low end reflects a slab foundation with basic siding and one door; the high end includes a full frost-wall foundation, insulation, drywall, heat, and upgraded doors and finishes.
Yes. The City of Ottawa requires a building permit for any accessory building over 15 square metres (about 161 sq ft), which covers virtually every garage. Permit fees usually run $300–$900, plus $1,500–$4,000 if drawings, a site plan, or a lot grading plan are needed. Zoning also limits height, setbacks, and rear-yard coverage.
Running power to a detached garage in Ottawa typically adds $3,500–$8,000, including the trench, buried feeder cable, sub-panel, circuits, and the required Electrical Safety Authority inspection. Long runs or trenching under a driveway push the cost higher.