Best Home Renovation in Cornwall, Ontario

Cornwall is the city at the centre of Stormont, Dundas and Glengarry, and the home renovation companies in Ontario on this page describe their territory in those terms. Millennial Contracting Inc. serves Cornwall and the surrounding SD&G communities. Ground Level Construction names Long Sault, Ingleside, Morrisburg and Martintown. Windmill Construction has worked across Stormont, Dundas and Glengarry since 1997. This page carries 13 companies, two of them based in South Stormont.

What stands out in Cornwall is how many companies pair renovation with something adjacent. Iron Fort Construction & Renovation combines water and fire damage restoration, foundation repair, waterproofing and emergency plumbing with kitchen and bathroom renovations and basement finishing. It holds 4.3 from 65 reviews, the largest body of feedback here. When a flood or leak is followed by a rebuild, one team can cover both stages.

Older, established firms sit alongside newer ones. Menard & Robertson is a third generation home builder tied to the Menard Group, which has done residential construction since 1955, and it keeps a Design Centre for clients choosing finishes. John Gordon Construction has been a general contractor in the Cornwall area since 1911, with industrial, commercial and institutional work such as church restoration and Seaway Lock structures, plus some residential renovation. TrueCon General Contractors Ltd. was established in 2024 and frames homes, additions and garages and installs metal roofing and siding.

Additions and secondary units are a visible part of the trade. Millennial Contracting Inc. takes on accessory dwelling units, coach houses, garage construction, sunrooms and multi-unit conversions, and holds 4.9 from 44 reviews. Ground Level Construction does basement apartments and secondary suites. Cornwall Renovations JSM Elite adds condo renovations, sheds, gazebos, pergolas and custom wood staircases to its list, and offers financing.

Featured home renovation companies in Cornwall

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Best home renovation companies in Cornwall

GRD Renovations

5.0· 20 Google reviews

771 Walton St, Cornwall

  • Renovates homes
  • Kitchen renovations
  • Bathroom renovations
(613) 870-0246

Wilson Construction

5.0· 4 Google reviews

Serves Cornwall (based in South Stormont)

  • Renovates homes
  • Kitchen renovations
  • Bathroom renovations
(613) 362-6699

Windmill Construction

4.2· 5 Google reviews

16024 Losey Rd, Cornwall (based in South Stormont)

  • Renovates homes
  • Kitchen renovations
  • Bathroom renovations
(613) 551-3838

Iron Fort Construction & Renovation and Windmill Construction also build new custom homes. The Home Construction Regulatory Authority licenses people who build or sell new homes in Ontario, and that licence covers new homes, not renovations of existing homes, so it matters for a new build and not for a kitchen remodel.

Several firms position themselves around a single strength. Baqi renovations works on full home renovations, entire basement apartments, kitchens and countertops, and toilet, bathtub and shower installation, and has 5.0 from 3 reviews. Nxtgen Construction - Cornwall Contractor is a young team that does excavation, heavy equipment work, steel stud framing and window and door installation for commercial and residential clients. Wilson Construction, based in South Stormont, does full house renovations, basement finishing and custom decks, and has 5.0 from 4 reviews.

Smaller names carry strong marks on fewer reviews. GRD Renovations has 5.0 from 20 reviews and JSM Elite Contracting has 5.0 from 21, a family run general contractor that builds decks in pressure treated wood, cedar and composite. TrueCon General Contractors Ltd. shows 3.0 from 2 reviews. Nearby pages cover Alexandria, North Stormont, Morrisburg, North Dundas and Metcalfe, so a project in the countryside around the city may also suit the companies listed there.

Common questions about home renovation companies in Cornwall

Who handles water or fire damage and the rebuild in Cornwall?

Iron Fort Construction & Renovation responds around the clock to floods and leaks, then handles the rebuild, including kitchen and bathroom renovations and basement finishing. Across 65 Google reviews it averages 4.3 out of 5.

Which Cornwall companies build additions or accessory dwelling units?

Millennial Contracting Inc. does additions, extensions, accessory dwelling units and coach houses. Ground Level Construction does basement apartments, secondary suites and home additions. Cornwall Renovations JSM Elite does house additions and garage remodels.

Who works in South Stormont, Long Sault or Morrisburg?

Wilson Construction and Windmill Construction are based in South Stormont. Ground Level Construction serves Long Sault, Ingleside, Morrisburg and Martintown from Cornwall. Windmill Construction works across Stormont, Dundas and Glengarry.

Is financing offered by any Cornwall renovators?

Cornwall Renovations JSM Elite and Millennial Contracting Inc. both offer financing. Cornwall Renovations JSM Elite also handles permits through the construction process, while Millennial Contracting Inc. is a design and build company.

Who does commercial or institutional work in Cornwall?

John Gordon Construction takes on industrial, commercial and institutional projects, including tenant fit-ups and concrete work. Windmill Construction does commercial and industrial projects, including ICF supply and installation. Menard & Robertson also builds for commercial clients.

Home Renovation near Cornwall