How much does a garage addition or conversion cost in Toronto?

A basic garage conversion (insulation, drywall, electrical, flooring) typically runs from the mid five figures upward, while adding a full second dwelling unit with plumbing and a separate entrance costs more and depends heavily on whether the existing structure needs foundation or structural upgrades. A new detached garage addition varies by size and whether it's built to match the house's finishes. Get itemized quotes from at least two or three builders before comparing, since scope definitions vary widely between contractors.

Do I need a permit to convert my garage in Toronto?

Yes. Any change of use from garage to living space requires a building permit from the City of Toronto, and if you're creating a legal second dwelling unit or garden suite there are additional zoning and egress requirements. A contractor who suggests skipping permits is a red flag, since unpermitted work can complicate insurance and resale.

How long does a garage conversion typically take?

A straightforward conversion of an existing single-car garage usually takes a few weeks of active construction once permits are approved, but permit approval itself can add several weeks to months depending on the scope and whether it involves a second dwelling unit application. Additions that require new foundation work take longer.

What should I check to judge the quality of a garage builder?

Ask for references from recent, similar-scope jobs, confirm they carry WSIB coverage and liability insurance, and check whether they handle the permit application themselves or expect you to. Also ask how they manage drainage and grading changes, since poor grading around a new or converted garage is one of the most common sources of water problems afterward.

Garage Additions & Conversions in Toronto

Garage Additions & Conversions in Ontario

Garage additions and conversions cover two different jobs that often get lumped together. An addition means building a new attached or detached garage onto a property, tying into the existing structure, roofline, and grading. A conversion means turning an existing garage into livable space (a rental unit, home office, gym, or garden suite) which usually involves insulation, drywall, electrical upgrades, and sometimes a full foundation review if the slab wasn't built for year-round living. Both require permits from the City of Toronto, and conversions in particular need to meet Ontario Building Code requirements for egress, ceiling height, and fire separation if they're going to be used as a second dwelling unit.

We track 6 businesses doing this work across Toronto. When comparing them, look past the marketing photos and check whether they pull permits themselves, how they handle grading and drainage against neighbouring properties, and whether their quotes separate structural work from finishing work. A contractor who won't put a line-item breakdown in writing is worth a second look before you sign.

Our ranking weighs verified reviews, licensing, permit history, and how consistently a builder finishes projects on the timeline they quote. See the full ranked list of Toronto garage addition and conversion builders, and read our methodology for how we score and verify each one.

Read the ranked guide: Best garage additions & conversions specialists in Toronto View all on map →

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All garage additions & conversions in Toronto, ranked by score and relevance

6 businesses, scored on recent reviews. The order weighs each business's overall score by how much of its reviewed work is garage additions & conversions, so a lower-scored specialist can rank above a higher-scored generalist.

Violet Build Toronto

5.0(58)✓ Google-verified

Every single review is five stars, and reviewers consistently describe a team that shows up on schedule, communicates clearly, and delivers polished work. Ali and Mozhdeh lead operations with honesty about costs and willingness to handle permit headaches or add finishing touches without padding invoices. Homeowners across Toronto, Richmond Hill, and Aurora praise their skill in complex work: accessible bathroom design for wheelchair users, structural moves like wall removal, basement entrance permits, and specialty finishes such as pot lights and glass railings. They back their work with a 2-year warranty and maintain relationships well after the job ends.

Detached Garage ConstructionGarage Additions & Conversions

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Piatek Homes

5.0(24)✓ Google-verified

Matt and his team deliver framing, underpinning, waterproofing, and renovation work on schedule and within budget. Reviewers consistently praise their professionalism, knowledge, and willingness to explain decisions and handle permits alongside the build itself. Every review is five stars over two years. The business stays in regular contact with homeowners, catches problems early, and treats each project as their own. Their reputation centers on being honest about scope, delivering what they promise, and making the process stress-free.

Garage Additions & ConversionsDetached Garage ConstructionCarriage House & Laneway Garages

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Nicks Developments

4.7(29)✓ Google-verified

Most customers speak of a personal, attentive building experience where Nick stands out for clear communication, honest problem-solving, and pride in finishing details. The team delivers on timeline and budget while managing complex projects smoothly; clients return for real estate advice and multiple builds over years. Staff members Bilal and Roland are named for responsiveness. Website claims over 20 years in business, WSIB registration, licensed trades, and $5M liability coverage. One outlier complaint exists with minimal detail; all substantive reviews emphasize professional follow-up after occupancy on minor defects.

Custom Finishes & Heated GaragesDetached Garage ConstructionGarage Additions & Conversions

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78 low data

Woodsmith Construction Inc

5.0(16)✓ Google-verified

All 14 reviews are five-star. Reviewers praise Chris Smith and Woodsmith consistently for design-build expertise spanning major renovations (third-floor additions, basement underpinning, open-concept reconfigurations), detailed kitchen and bathroom work, and garage additions. Communication stands out: cost reports weekly, availability throughout, permits handled end-to-end, no surprises. Team professionalism and site cleanliness earn mention repeatedly. No negative themes appear in the review set.

Detached Garage ConstructionGarage Additions & Conversions

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77 low data

ODIMA Construction

5.0(32)✓ Google-verified

Every review gives five stars. Clients praise Reza and his crew for responsiveness, professional trades, clean work, and staying within timelines and budgets. Many mention custom details, upgrades, and a family-like experience with tradespersons who know their craft.

Detached Garage ConstructionGarage Additions & Conversions

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54 low data

Home Services at The Home Depot

2.8(4)✓ Google-verified

Two recent one-star reviews describe service as incompetent and dismissive of customer concerns. Limited positive evidence from four reviews total; recent track record skews heavily negative.

Detached Garage ConstructionGarage Additions & ConversionsGarage Doors & Openers

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When you submit an enquiry through our forms, we may share it with partner providers who can do the work, and we may receive a referral fee. Our rankings and scores are based on our published scoring method only and are not influenced by referral fees.

Common questions about garage additions & conversions

How much does a garage addition or conversion cost in Toronto?: A basic garage conversion (insulation, drywall, electrical, flooring) typically runs from the mid five figures upward, while adding a full second dwelling unit with plumbing and a separate entrance costs more and depends heavily on whether the existing structure needs foundation or structural upgrades. A new detached garage addition varies by size and whether it's built to match the house's finishes. Get itemized quotes from at least two or three builders before comparing, since scope definitions vary widely between contractors.
Do I need a permit to convert my garage in Toronto?: Yes. Any change of use from garage to living space requires a building permit from the City of Toronto, and if you're creating a legal second dwelling unit or garden suite there are additional zoning and egress requirements. A contractor who suggests skipping permits is a red flag, since unpermitted work can complicate insurance and resale.
How long does a garage conversion typically take?: A straightforward conversion of an existing single-car garage usually takes a few weeks of active construction once permits are approved, but permit approval itself can add several weeks to months depending on the scope and whether it involves a second dwelling unit application. Additions that require new foundation work take longer.
What should I check to judge the quality of a garage builder?: Ask for references from recent, similar-scope jobs, confirm they carry WSIB coverage and liability insurance, and check whether they handle the permit application themselves or expect you to. Also ask how they manage drainage and grading changes, since poor grading around a new or converted garage is one of the most common sources of water problems afterward.

Garage Additions & Conversions in Toronto

All garage additions & conversions in Toronto, ranked by score and relevance

Violet Build Toronto

Piatek Homes

Nicks Developments

Woodsmith Construction Inc

ODIMA Construction

Home Services at The Home Depot

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Common questions about garage additions & conversions