Cornerstone Construction — General Contractor in Oshawa, Ontario
Cornerstone Construction is an Oshawa-based renovation contractor covering Durham Region homeowners who want one team handling a project from demo through finish. The company focuses on full-home renovations alongside smaller interior upgrades, which is the useful mix when a bathroom refresh quietly turns into a layout change. Their public-facing site is at cornerstoneconstruction-inc.com.
Services
- Full-home renovations — gutting, layout changes, and rebuild-to-code work where structure and finishes both need attention.
- Kitchen renovations — cabinetry, counters, appliances, and the electrical/plumbing rework that usually comes with them.
- Bathroom renovations — tile, fixtures, waterproofing, and minor layout shifts.
- Interior remodelling — flooring, trim, doors, and paint refreshes when the bones are already sound.
- Additions & basements — finishing lower levels or adding usable square footage.
Service Area
Oshawa is the home base, with Durham Region coverage extending to Whitby, Ajax, Pickering, Courtice, and Bowmanville — the corridor where the majority of east-GTA reno demand sits.
Why it’s on home.renovation.reviews
Durham pros are under-represented in most Toronto-centric directories. We keep a separate lane for east-GTA contractors so Oshawa and Whitby homeowners aren’t stuck filtering through Mississauga-only listings. Cornerstone fits that slot — a local-first GC with a straightforward service list.
More from home.renovation.reviews
- Related Durham listing: CCR Renovations (Whitby)
- Reno-planning reference: Modern Bathrooms 2026 Design Guide
- Main site: LF Builders — renovation services