Home additions

The 10 Best Home Addition Contractors in Mississauga, ON

Updated 85 firms checked10 ranked

This list ranks 10 home addition contractors in Mississauga, ON. It starts from Google Maps searches for home additions and related building work in Mississauga: 85 firms were checked, and building and renovation firms with their own website and an open Google listing went forward. Firms are weighed on their Google rating, the number of reviews behind it, how closely their services match home addition work, and their portfolio. The strongest firm overall sits at place 1, places 2 to 4 carry a badge for what each suits best, and places 5 to 10 run in order. Ratings and review counts are Google's, checked October 14, 2026. How we rank

Rock Cliff Custom Homes

Best overall

Family-run builder of custom homes, cottages, renovations and heritage restorations in Oakville, Burlington, Mississauga and the Muskoka region.

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Why it ranks here

  • A family-run builder with over 20 years in new homes, cottages, renovations and restoration work.
  • Works on a 100% open-book policy and offers a full design and build service.
  • Past projects include a 3,800 sq ft heritage addition and restoration in Oakville and a 5,850 sq ft Nobleton estate.
  • Works mainly in Oakville, Burlington and Mississauga and also takes on clients in the Muskoka region.
  • Builds in small volumes to keep the team focused on each project.
Home additions · Custom homes · Heritage restorations · Renovations · Cottages Oakville, serves Mississauga
Visit website Call 905-965-6655
4.9 from 48 Google reviews

Vision Homes

Best for additions with custom millwork

Clarkson-based Mississauga renovator doing kitchens, bathrooms, basements, additions and custom millwork across Mississauga, Oakville, Etobicoke and Burlington.

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Why it ranks here

  • Carpenter Jonathan Cabak leads every project personally and brings 18 years of custom building and renovation work.
  • Keeps design and construction in-house through to the final walkthrough, with one crew working under one contract.
  • Based in Clarkson in west Mississauga, it also works in Oakville, Etobicoke and Burlington.
  • Makes custom millwork such as built-ins, wall panelling and storage alongside its renovation work.
  • Basement projects include extra living space, home theatres and in-law suites.
Home additions · Full home builds · Kitchen renovations · Basement renovations · Custom millwork Mississauga
Visit website Call 647-449-9574
5.0 from 30 Google reviews

Albo Homes

Best for garden suites

Custom home builder with in-house architects, building new homes, additions and garden suites across Toronto, Mississauga, Oakville and Burlington.

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Why it ranks here

  • Keeps architects in-house to prepare preliminary drawings for new homes, additions and renovations, with 3D rendering on offer.
  • Interior renderings of kitchens and bathrooms are available before construction, so changes can be made early.
  • Clients can ask the project manager to arrange a visit to a home under construction to see work in progress.
  • Recent builds span North York, Etobicoke, Mineola in Mississauga, Kerr Village in Oakville, Burlington and Vaughan.
  • Pre-build consulting covers home size and complexity, timing and even buying land for a new house.
  • Also designs and builds garden suites and additions, including a full renovation and addition in Old Mill, Etobicoke.
Home additions · Custom homes · Garden suites · Design-build · Architectural drawings Mississauga
Visit website Call 416-891-8900
4.9 from 15 Google reviews

Georgian Custom Homes and Additions

Best for architect-designed additions

Toronto design-build firm doing custom homes, major renovations and additions across the GTA, with architecture and interior design in-house.

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Why it ranks here

  • Has over 60 years of experience, with the Georgian company history going back to 1966 in Mississauga.
  • Is affiliated with both BILD and RenoMark.
  • Backs its work with a 5-year warranty and 24-hour support.
  • Takes each build through a 10-step process that begins with a feasibility study.
  • Has an in-house design team, with Michelle Mawby as principal designer, and a showroom on Castlefield Avenue in Toronto.
Home additions · Custom homes · Major renovations · Design-build · Interior design Mississauga
Visit website Call 437-747-6859
4.6 from 30 Google reviews

Cozy Casa

Greater Toronto Area design-build studio doing custom homes, full home renovations, basements and secondary suites, plus commercial fit-outs.

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  • Works as a design-build studio, treating design and construction as one process from the first day of a project.
  • Residential work spans custom homes, full renovations and additions, lifestyle basements and legal secondary rental suites.
  • Leads the design itself and brings in architects, engineers and interior designers when a project needs them.
  • Portfolio includes a custom home and a lifestyle basement in Mississauga, a legal basement in Oakville and a Toronto condo remodel.
  • Commercial jobs cover offices, retail units, tenant fit-outs, restaurants and wellness facilities.
Custom homes · Lifestyle basements · Design-build · Legal secondary suites · Home additions Mississauga
Visit website Call 905-789-5665
5.0 from 70 Google reviews

Ace Build Contracting

Mississauga design-build general contractor handling custom homes, second-storey additions, legal basements and major renovations across the Greater Toronto Area.

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  • Founded in 2018, the company reports 1800+ projects completed.
  • Addition work covers second-storey additions and rear extensions planned around the house that is already there.
  • Legal basement projects come with coordinated drawings, inspections, entrances, kitchens and bathrooms.
  • Design-build jobs bring architectural design, engineering, project management and construction together under one team.
  • Its service list also includes garden suites, commercial renovations and project management.
Custom homes · General contracting · Home additions · Legal basements · Garden suites Mississauga
Visit website Call 905-904-3511
4.9 from 147 Google reviews

Ranks 07 to 10

Title Building Group

Custom home builder

5.0 647-999-5748CallWebsite

Amaar Homes

Custom home builder

4.8 647-779-3022CallWebsite

Woodcastle Homes Management

Custom home builder

4.7 905-891-0200CallWebsite

Build It

Mississauga commercial builder fitting out restaurants, retail stores, hotels and healthcare spaces across Canada with its own trades and millwork shop.

4.9 905-696-0486CallWebsite

Compare the firms

FirmBest forServicesGoogle ratingArea
01Rock Cliff Custom HomesCustom homes and heritage home restorationsHome additions · Custom homes · Heritage restorations · Renovations · Cottages4.9Oakville, serves Mississauga
02Vision HomesAdditions with custom millworkHome additions · Full home builds · Kitchen renovations · Basement renovations · Custom millwork5.0Mississauga
03Albo HomesGarden suitesHome additions · Custom homes · Garden suites · Design-build · Architectural drawings4.9Mississauga
04Georgian Custom Homes and AdditionsArchitect-designed additionsHome additions · Custom homes · Major renovations · Design-build · Interior design4.6Mississauga
05Cozy CasaCustom homes and legal basement suitesCustom homes · Lifestyle basements · Design-build · Legal secondary suites · Home additions5.0Mississauga
06Ace Build ContractingCustom homes and second-storey additionsCustom homes · General contracting · Home additions · Legal basements · Garden suites4.9Mississauga
10Build ItRestaurant, retail and hospitality build-outsGeneral contracting · Commercial fit-outs · Millwork · Project management · Design services4.9Mississauga

What to check before hiring a home addition contractor in Mississauga

Five things to confirm with any firm, on this list or not, before you sign. The rules below are Ontario's and Mississauga's.

  1. Registration with the WSIB

    Ask the firm for a clearance certificate from the WSIB, which confirms it is registered for workers' compensation and its account is in good standing. The certificate confirms the firm is registered with the WSIB and up to date on its premiums, so check its dates cover your job.

  2. Liability insurance

    Ask for a certificate of insurance that names the firm and shows commercial general liability coverage in force for the dates of your job, and check that the subcontractors it brings in are covered too.

  3. The building permit from Mississauga

    Building permits for homes in Mississauga come from the City of Mississauga, and every addition needs one, and often a zoning review first. Agree in writing who applies for the permit and books the inspections.

  4. A written contract

    Get the scope of work, the payment schedule tied to stages of the work, start and finish dates, how changes are agreed and priced, and who handles permits and cleanup, all in one signed contract before any work starts.

  5. The warranty

    A renovation is not a new home, so the new home warranty rules usually do not apply: get the firm's own workmanship warranty in writing, with what it covers and for how long. Renovators in RenoMark, the Canadian Home Builders' Association program, offer a minimum two-year warranty on their work.

Types of home addition contractor in Mississauga

The 10 firms on this list fall into 3 groups, read from what each firm's own site says it does and how it is listed on Google.

Home builders5

Home builders build new houses as their main work, and some take on additions and major renovations too.

Design-build firms4

Design-build firms design the project and build it under one contract, so one firm answers for the drawings and the work.

General contractors1

General contractors run building projects of many kinds and bring in the trades each job needs.

Home additions in Mississauga: common questions

Do I need a permit for a home addition?

Yes. An addition changes the footprint or height of the house, so it needs a building permit and often a zoning review for setbacks and lot coverage. Plans are usually drawn by a designer or architect before the permit application goes in.

Can I add a second storey to my house?

Often, but the existing foundation and walls have to carry the new load. An engineer checks the structure before design starts, and the contractor builds to those drawings.

What happens before an addition is built?

A survey of the lot, a check of the zoning rules for setbacks, height and lot coverage, drawings by a designer or architect, an engineer's review where the structure is affected, and the building permit. Ask the firm which of these steps it handles and which it expects from your designer.

Can I live in my house while an addition is built?

Often. Most of the work happens outside the existing walls until the new space is joined to the house. Expect noise and dust, and a few days without power or water when the addition is tied in.

How do I check that a contractor in Mississauga is registered with WSIB?

Ask the firm for a clearance certificate from the WSIB. The certificate confirms the firm is registered with the WSIB and up to date on its premiums, so check its dates cover your job.

Who issues building permits in Mississauga?

Building permits for homes in Mississauga come from the City of Mississauga. For home addition work, every addition needs one, and often a zoning review first. Many firms apply for the permit as part of the job, so agree who does it before you sign.

Before you get quotes

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