A garage addition means building new garage space onto or beside a house, usually to replace a carport, add a second bay, or create storage and workshop room where none existed. A garage conversion goes the other direction: turning an existing garage into livable space such as a rec room, home gym, in-law suite, or income-generating secondary unit. Both jobs touch structural work, insulation, electrical, sometimes plumbing, and in Mississauga, a trip through the city's permitting and zoning process for setbacks, driveway access, and (for conversions) habitable space requirements. We've listed 17 businesses in this category that handle these projects across the city.
Our scoring weighs review volume and rating consistency, how a business responds to complaints, licensing and insurance signals, and how long they've been operating in the Mississauga market. See the full ranked list of garage addition and conversion contractors for how these 17 businesses compare, and read our methodology for the full breakdown of how we score and rank.
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We found 17 businesses offering garage additions & conversions in Mississauga; 10 met the criteria for the scored directory. 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.
M & D Buildings handles large and small renovations with consistent professionalism. Homeowners praise Mike's responsiveness, his team's attention to detail, and reliable timelines, with many returning for second projects. The operation covers structural work, kitchens, bathrooms, basements, and finishes, backed by daily cleanup and clear communication.
Most work gets completed on time with crews arriving when promised and finishing to high standards. The 4-layer proprietary system and nanospartic coating are praised for durability, and staff including Chris, Will, Jeff, Heiner, Braydon, Fabyan, and Juan are named for professionalism and detail. However, a minority of customers reported coating cracks and peeling after 2-4 years; while one reviewer noted the company ultimately resolved their issues after initial warranty friction, another felt their longstanding problems were dismissed.
Koulani Contractors earns consistent praise for finishing bathroom and kitchen renovations efficiently and to a high standard. Yaser (the principal) and his team are noted for polished workmanship, keeping sites clean, meeting timelines, and transparent pricing across the GTA.
Garage Solutions 4 Less excels at floor coatings and wall systems. Twenty of 22 reviews are five-star, with customers praising the team's professionalism, punctuality, and clear communication throughout projects. One early complaint noted a rude initial phone interaction, but the bulk of evidence shows responsive staff like Marc, Teddy, and Fabyan who keep customers informed and deliver lasting results.
Happy Valley Home Builders earns consistent 5-star praise for basement conversions, legal units, and permit work in Mississauga and the GTA. Reviewers cite on-time delivery, affordable rates, professional crew leadership (named Ali and Tony), and stress-free permit handling as standout strengths. No significant complaints recorded.
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Adam and his crew deliver finished work that meets city code and keeps schedules. Reviewers praise quick responses, clear communication through projects, and fair pricing on home additions, conversions, and detached garages. No complaints surface across the reviews.
Maki Construction delivers high-quality renovations with strong attention to detail. Mario's team consistently finishes on time and on budget, though older reviews hint at occasional follow-up issues after completion.
Garage One earns strong praise for speed, fair pricing, and skilled technicians who fix problems on the same day or within hours. Reviewers name Hamza, Ahmed, and Muhammed as reliable installers and repair specialists. However, a minority report being stood up or ignored after service goes wrong, raising questions about consistency.
Only one recent review is available. A customer waited over 10 minutes to use a QR code system for power tools, received no useful help from staff, and left frustrated. Review evidence is too limited to draw firm conclusions about overall service quality.
Review data is minimal (one five-star rating only). Their website states they are a licensed, insured contractor with WSIB certification and $1M liability insurance, operating out of Mississauga. They offer AC, HVAC, furnace, heat pump, water heater, and insulation installation, plus carpet, window, and cabinet work.
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.
Last updated 2026-09-16