Home additions

The 10 Best Home Addition Contractors in Oakville, ON

Updated 109 firms checked10 ranked

This list ranks 10 home addition contractors in Oakville, ON. It starts from Google Maps searches for home additions and related building work in Oakville: 109 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 3 carry a badge for what each suits best, and places 4 to 10 run in order. Ratings and review counts are Google's, checked October 14, 2026. How we rank

Georgian Custom Homes

Best overall

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

Updated

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 Oakville
Visit website Call 437-747-6859
5.0 from 29 Google reviews

Rock Cliff Custom Homes

Best for additions to heritage homes

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
Visit website Call 905-965-6655
4.9 from 48 Google reviews

Onelife Design & Build

Best for design-build additions

Oakville design-build firm doing custom homes, home additions and renovations, from planning and design through construction.

Updated

Why it ranks here

  • Has been in business for 12 years, with 84-plus completed projects.
  • Brings architecture, interior design, demolition, construction and project management under one roof.
  • Clients deal directly with its in-house designers, coordinators, managers and builders.
Home additions · Custom homes · Renovations · Interior design · Design-build Oakville
Visit website Call 905-336-0347
4.8 from 23 Google reviews

Albo Homes

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

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  • 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 Oakville
Visit website Call 416-891-8900
5.0 from 6 Google reviews

Oakville Renovation

Greater Toronto Area general contractor doing kitchen and bathroom remodels, additions, new construction, outdoor carpentry and project management.

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  • Founder Denis Putiyenko started the company in 2002 after working for Mattamy Homes from 1996.
  • From 2005 to 2010 the founder taught hundreds of students at the York Construction Academy.
  • Reports hundreds of projects, large and small, completed across the Greater Toronto Area.
  • Can be hired as project manager, taking on trade scheduling, material purchasing, site supervision and quality control.
Kitchen remodelling · Bathroom remodelling · Home additions · Project management · Outdoor carpentry Oakville
Visit website Call 647-839-1378
5.0 from 43 Google reviews

Ranks 07 to 10

Title Building Group

Custom home builder

5.0 647-999-5748CallWebsite

EverOak Homes

Custom home builder

5.0 905-469-9000CallWebsite

Profile Custom Homes

Custom home builder

4.5 905-822-7070CallWebsite

Supreme Custom Build & Design

Custom home builder

5.0 647-303-3547CallWebsite

Compare the firms

FirmBest forServicesGoogle ratingArea
01Georgian Custom HomesDesign-build with architecture in-houseHome additions · Custom homes · Major renovations · Design-build · Interior design5.0Oakville
02Rock Cliff Custom HomesAdditions to heritage homesHome additions · Custom homes · Heritage restorations · Renovations · Cottages4.9Oakville
03Onelife Design & BuildDesign-build additionsHome additions · Custom homes · Renovations · Interior design · Design-build4.8Oakville
05Albo HomesNew custom homes designed in-houseHome additions · Custom homes · Garden suites · Design-build · Architectural drawings5.0Oakville
06Oakville RenovationRenovations needing a hired project managerKitchen remodelling · Bathroom remodelling · Home additions · Project management · Outdoor carpentry5.0Oakville

What to check before hiring a home addition contractor in Oakville

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

    Building permits for homes in Oakville come from the Town of Oakville, 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 Oakville

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 builders6

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

Design-build firms3

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 Oakville: 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 Oakville 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 Oakville?

Building permits for homes in Oakville come from the Town of Oakville. 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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