How much does a detached garage cost in Ottawa?

A basic single-car unheated garage with a gravel or basic concrete pad often starts in the low tens of thousands, while a heated, insulated two-car garage with drywall, electrical, and upgraded siding can run considerably higher. Lot conditions, foundation type, and finish level are the biggest swing factors, so get itemized quotes from at least two or three builders before comparing totals.

Do I need a permit to build a detached garage in Ottawa?

Yes. The City of Ottawa requires a building permit for a detached garage, and the application reviews setbacks from property lines, maximum size and height, and lot coverage rules. A reputable builder will handle this application as part of the job or clearly tell you if it's on you to arrange.

How long does a typical detached garage build take?

Once permitted, most single- or double-car detached garages take a few weeks of active construction, though weather, concrete curing time, and material lead times (especially for garage doors) can stretch the schedule. Winter builds in Ottawa often take longer due to frost and slower concrete cure times.

How do I judge the quality of a garage builder before hiring?

Ask to see photos or addresses of completed garages you can drive by, check that they carry WSIB coverage and liability insurance, and confirm the concrete slab spec (thickness and reinforcement) rather than accepting a vague verbal answer. A builder who walks you through the permit and inspection process without being asked is usually a good sign.

Detached Garage Construction in Ottawa

A detached garage is a full build, not an add-on. It starts with a permit application to the City of Ottawa, which checks setbacks, lot coverage, height limits, and how close you can build to a property line or existing structure. From there the work runs through excavation and footings, a concrete slab, framing, roofing, siding to match or complement the house, and finally doors, windows, and electrical if you want lighting, outlets, or a sub-panel for tools and a car charger. Some owners add insulation and drywall to use the space as a workshop or heated storage, which changes the scope and cost significantly.

We list 20 companies in this category that build detached garages around Ottawa, from single-bay backyard structures to larger two- or three-car builds with loft storage. Before you hire, ask who pulls the permit, whether the quote includes site prep and disposal of excavated soil, what the concrete spec is (thickness, rebar, vapor barrier), and how they handle grading so water runs away from the foundation rather than toward it. Get a clear breakdown between structure, siding, doors, and electrical, since these are often quoted separately.

Our ranked guide to detached garage builders in Ottawa scores companies on the factors above, weighted using the approach described in our methodology, so you can compare builders on more than just price.

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All detached garage construction in Ottawa, ranked by score and relevance

We found 20 businesses offering detached garage construction in Ottawa; 11 met the criteria for the scored directory. The order weighs each business's overall score by how much of its reviewed work is detached garage construction, so a lower-scored specialist can rank above a higher-scored generalist.

Magnolia Design & Build

4.8(125)✓ Google-verified

Joey and his team handle complex projects with calm problem-solving, from basements carved out of bedrock to multi-bathroom renovations. They answer calls on weekends, explain honest trade-offs, and keep sites clean for families. Named staff (Richard, Faraz, Pierre, Michelle, Giuseppe, Stacy) appear consistently across projects, showing stable operations over years. Basement work, bathroom renos, and home additions dominate the reviews. One project ran two weeks over but reviewers called it worth the wait. Multiple customers are repeat clients. Pricing stays within quoted budgets, a rarity clients emphasize. Their website lists broader services (kitchen, custom homes, commercial), but the Google reviews focus on residential renovations and basements.

Detached Garage ConstructionGarage Additions & ConversionsCustom Finishes & Heated Garages

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Capital Homes

4.9(112)✓ Google-verified

Capital Homes executes kitchen, bathroom, and multi-room renovations with visible attention to detail and reliable timelines. Clients consistently praise named project managers Conor, Ammar, and Moe for transparent estimates, on-budget work, and hands-on follow-up even months after completion. Minor delays from external suppliers have occurred but the team works to resolve them without cost impact. Most projects stay on schedule and budget, with crews keeping worksites clean and handling existing fixtures carefully. Their background spans rental property work, major home renovations, and custom finishes, all completed to the same standard. A few clients note projects took slightly longer than expected, though the final quality made the wait worthwhile.

Detached Garage ConstructionGarage Additions & Conversions

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Cooper Builds

5.0(32)✓ Google-verified

Every reviewer gives Calvin five stars. Work ranges from bathrooms and kitchens to decks, fences, and custom woodwork. He quotes clearly, finishes on schedule, communicates promptly, and produces results that match or exceed what homeowners imagined. Dust control and daily cleanup are habits. His craftsmanship earns trust across both small emergency fixes and major renovations.

Detached Garage ConstructionGarage Design & Permit Drafting

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The Assembly Experts

4.7(153)✓ Google-verified

Over three years of repeat work, Assembly Experts earns consistent five-star praise for punctual arrival, polished professionalism, and durable builds that hold up without loosening or shifting. Work that takes homeowners days finishes in hours-gazebos, pergolas, sheds, and solariums-with staff who clean up and welcome inspection before leaving. Two isolated one-star reviews flag payment-method chaos and a roofing panel failure, though the payment complaint centers on unclear terms communicated after arrival rather than the work itself. The business's response to the panel failure showed defensiveness rather than accountability. These remain outliers in a 92% five-star spread.

Detached Garage ConstructionGarage Additions & ConversionsCustom Finishes & Heated Garages

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OakWood Designers & Builders

4.5(105)✓ Google-verified

Projects consistently finish on schedule with transparent costs and responsive design teams. Dan Lavigne, Mike Ortis, and other named staff earn repeated praise for patience through design decisions, clear planning, and collaborative problem-solving on complex builds. Custom homes and kitchen renovations show meticulous execution; one reviewer noted higher-than-expected site costs but credited OakWood for working through the challenge collaboratively. OakWood operates as both design firm and builder, handling everything from 3D renderings to final finishes. Their website lists LEED certification and services since 1956. The review base skews heavily five-star, with no complaints about workmanship, timeliness, or professionalism. One caveat: large custom builds may involve site variables that require financial contingency planning upfront.

Detached Garage ConstructionCustom Finishes & Heated Garages

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76 low data

Ottawa Carleton Construction

5.0(12)✓ Google-verified

Five-star ratings consistently reflect Frank Porcari's hands-on leadership, knowledge of Ottawa building codes, and ability to deliver custom homes and multi-unit projects on schedule and within budget. Reviewers praise workmanship quality, responsive follow-up, and a collaborative design process.

Garage Additions & ConversionsDetached Garage Construction

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Ottawa General Contractors

4.4(233)✓ Google-verified

Strong reviews praise Murad, George, Roger, and Adam as project managers who keep clients informed through photos and daily updates, coordinate multiple trades smoothly, and deliver finished homes on or ahead of schedule. Yet multiple one-star reviews cite unfinished work, surprise invoices, contract gaslighting, and a practice of offering compensation credits only if clients sign NDAs preventing negative comments. The disparity suggests two very different customer experiences depending on project scale or execution. Suitable for large interior renovations with a named project manager. Hire with eyes open to potential scope creep and have clear contract language before signing. Check past client references directly, not just reviews.

Detached Garage ConstructionGarage Additions & ConversionsCustom Finishes & Heated Garages

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69 low data

PR Builder

5.0(25)✓ Google-verified

All 25 Google reviews rate PR Builder five stars, though specific details about their detached garage work are limited. The business operates in Nepean and surrounding Ottawa areas; review evidence does not yet clarify which services reviewers praised most.

Detached Garage Construction

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Monaco Construction

4.1(58)✓ Google-verified

Most work is completed with solid craftsmanship and many projects finish on time and on budget. The crew is often professional and responsive during the job itself. However, significant delays, spotty communication, and follow-up issues plague the experience for some customers, particularly during longer projects. Worksite cleanliness and accountability for post-completion problems vary widely. A repeat customer praises their deck and window well work as timely and reliable. Kitchens, bathrooms, decks, and concrete work appear strong suits. One elderly customer reported unpaid work and incomplete delivery. Another faced a three-month project with weeks of silence, poor site management, and cracked cement steps that required patching months later.

Detached Garage Construction

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#10

71 low data

Holland Homes & Renovations Inc.

5.0(16)✓ Google-verified

Holland Homes delivers on major additions and renovations with owner Robert and project manager Scott driving consistent praise for design input, site responsiveness, and budget honoring across 16 five-star reviews. Strength lies in managing old-home challenges, coordinating trades, and keeping homeowners informed throughout.

Carriage House & Laneway GaragesDetached Garage ConstructionGarage Additions & Conversions

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#11

56 low data

Ottawa Home Pros

4.1(8)✓ Google-verified

Most five-star reviews praise clean, fast work and easy project navigation; older negative reviews cite slow starts, imprecise finishes, and poor communication during construction. Limited detail available on recent work quality or current operations.

Detached Garage ConstructionGarage Additions & Conversions

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When you submit a quote or contact form here, your enquiry may go to partner providers who can do the work, and we may earn a referral fee. Our rankings and scores come from our published scoring method only, never influenced by referral fees.

Common questions about detached garage construction

How much does a detached garage cost in Ottawa?: A basic single-car unheated garage with a gravel or basic concrete pad often starts in the low tens of thousands, while a heated, insulated two-car garage with drywall, electrical, and upgraded siding can run considerably higher. Lot conditions, foundation type, and finish level are the biggest swing factors, so get itemized quotes from at least two or three builders before comparing totals.
Do I need a permit to build a detached garage in Ottawa?: Yes. The City of Ottawa requires a building permit for a detached garage, and the application reviews setbacks from property lines, maximum size and height, and lot coverage rules. A reputable builder will handle this application as part of the job or clearly tell you if it's on you to arrange.
How long does a typical detached garage build take?: Once permitted, most single- or double-car detached garages take a few weeks of active construction, though weather, concrete curing time, and material lead times (especially for garage doors) can stretch the schedule. Winter builds in Ottawa often take longer due to frost and slower concrete cure times.
How do I judge the quality of a garage builder before hiring?: Ask to see photos or addresses of completed garages you can drive by, check that they carry WSIB coverage and liability insurance, and confirm the concrete slab spec (thickness and reinforcement) rather than accepting a vague verbal answer. A builder who walks you through the permit and inspection process without being asked is usually a good sign.

Detached Garage Construction in Ottawa

All detached garage construction in Ottawa, ranked by score and relevance

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Common questions about detached garage construction