Best garage additions & conversions companies in Mississauga

★★★★★4.9 (85 reviews)score 89/100

M & D Buildings holds a 4.9 rating across 85 reviews, with Mike and his team handling design, permits, and every trade in-house so projects move without handoff gaps. Reviewers consistently describe work landing on schedule and on budget, with daily site cleanup and steady communication from start to finish.

• One-stop service: design, permits, and all trades in-house
• Owner Mike involved from start to finish
• Consistent on-time and on-budget delivery
• Proactive communication and daily site cleanup

Services: garage additions conversions, garage permits design, detached garage construction, custom finishes heated garages

★★★★★4.9 (311 reviews)score 93/100

With 311 reviews at a 4.9 average and the highest confidence score on this list, Garage Floors 4 Less HQ has the deepest track record here. Crews explain each step, work around obstacles with precision, and back every job with a 15-year transferrable warranty on their four-layer Nanospartic coating system.

• Proprietary four-layer epoxy system with Nanospartic coating
• 15-year transferrable warranty
• On-site quotes with a minimal 10% deposit
• Named techs (Chris, Wil, Juan, Alex, Dean) praised for professionalism

Watch out: One reviewer flagged an early colour mix-up, but the team corrected it right away.

Services: garage doors openers, detached garage construction, garage additions conversions

★★★★★4.9 (52 reviews)score 87/100

DL Builds ltd earns a 4.9 rating from 52 reviews, with Darren's crew (Richard, Jersey, Andrew, Darryl, Lucas) turning out finished spaces reviewers call stunning and flawless. Weekly photo updates, dust control, and daily cleanup back up a reputation for landing projects on time and on budget.

• Weekly photo updates and clear communication
• Consistent on-time, on-budget delivery
• Meticulous attention to finishing details
• Darren actively involved and responsive on-site

Watch out: Review volume is smaller than the top two on this list, so the sample is thinner.

Services: detached garage construction, garage additions conversions

★★★★★4.8 (22 reviews)score 77/100

Garage Solutions 4 Less shows 20 of 22 reviews at five stars for its floor coating and wall system work, with Marc, Teddy, and Fabyan named repeatedly for keeping customers informed through the project. The review count is small, so treat the sample as an early but strongly positive signal.

• Garage floor prep and polyaspartic coating expertise
• Named team (Marc, Teddy, Fabyan, Victor) known for reliability
• Daily communication updates during projects
• Turns neglected concrete into durable, attractive finishes

Watch out: One review cited a rude initial phone interaction and inflexible scheduling.

Services: detached garage construction, garage doors openers, garage additions conversions

★★★★★5 (13 reviews)score 75/100

Marathon Consultancy holds a perfect 5.0 rating, though from a small pool of 13 reviews. Reviewers point to Adam's quick responses and fair pricing on additions, conversions, and detached garages, with the team handling city permits and approvals directly and no complaints on record.

• Responds quickly to enquiries
• Manages city permits and approvals
• Finishes on schedule
• Sources honest, reliable subcontractors

Services: detached garage construction, garage additions conversions

★★★★★4.6 (39 reviews)score 66/100

Maki Construction Inc carries a 4.6 rating over 39 reviews, with Mario's team praised for detailed coordination and finishing complex, multi-phase jobs on time and on budget. The review history skews older, and a couple of accounts mention issues that surfaced after handover.

• Detailed project coordination from estimate to completion
• Efficient timelines on complex multi-phase work
• Hands-on owner involvement and design guidance

Watch out: Some reviews mention weaker follow-up after the project wrapped, including one hidden basement leak.

Services: detached garage construction, garage additions conversions

★★★★☆4.2 (131 reviews)score 77/100

Garage One Inc. has the largest review base on this list at 131, with Ahmed and Hamza named often for skilled, efficient work and same-day turnaround. About three-quarters of reviews are five-star, and long-term customers mention sticking with the company for over a decade.

• Same-day service availability
• Named expert technicians (Ahmed, Hamza, Muhammed)
• Fair, transparent pricing with discounts
• Long-term customer retention (12+ years mentioned)

Watch out: A handful of reviews describe broken promises and difficulty getting a response afterward.

Services: garage doors openers, detached garage construction, custom finishes heated garages, garage additions conversions

★★★★★4.5 (2 reviews)score 58/100

This Home Depot Home Services location carries a 4.5 average, though from just two reviews, so treat it as a light signal. Its main draw is the Home Depot backing itself: licensing, insurance, and $1M liability coverage baked into the service.

• Licensed and insured
• Home Depot affiliated backing and accountability

Watch out: Only two reviews exist, so there is little independent evidence of garage-specific work quality.

Services: detached garage construction, garage additions conversions

score 26/100

This second Home Depot Home Services listing in Mississauga has no reviews yet, so there is no customer evidence to weigh beyond its claim of licensed, insured contractor work through the Home Depot network. It's included here as an option to research further rather than a proven performer.

• Backed by the Home Depot brand and network
• Claims licensed, insured contractor work
• Operates within the Mississauga service area

Watch out: No customer reviews exist yet, so garage-specific work quality can't be verified.

Services: detached garage construction, garage additions conversions