Renovation Contractor in Oshawa & Durham Region
Property Management Partner
Repairs, renovations, unit turns, and insurance restoration across your whole portfolio — on a locked price, a scheduled finish date, and documented so you can show your owners exactly what they paid for. One number that gets answered. One crew that shows up.
Free to set up · Usually cleared to assign work within a day · Durham Region & the GTA
Repairs, renos, turns, and claims — one contact for your whole portfolio. We pick up and show up, so you're not left chasing a callback.
Your written price is locked once you sign. On projects of $15,000+ that run about a month or longer, you get a $300 credit for each day we run late for reasons within our control. Give your owner a number that holds.
Our jobs run on a live portal you can forward straight to the owner — photos, approvals, invoices. The answer in writing, not a guess.
Full renovations close out with an Owner's Manual and our 5-year workmanship warranty.
Every Empty Day Is Lost Rent
Managed buildings don't keep business hours — a tenant's burst pipe, a unit to turn between leases, a kitchen the owner finally approved, a fire claim that lands on a Friday. Most of it ends up being someone else's slow callback and your name on the line for it. Cornerstone is built to be the single vendor you can hand any of it — occupied or vacant, repair or rebuild — and not have to chase.
One contact for turns, renovations, and restoration across your whole portfolio. Built to commercial standards — that's Mike's background — so a rental unit gets the same discipline as a storefront. The more of your portfolio we handle, the tighter it runs: predictable scheduling and one clean trail of invoices instead of chasing five trades.
Your name with the owners you manage for. When an owner asks what happened in their building, you hand them the answer in writing — photos, approvals, and documents on a live portal, not a guess. A clean, documented job is a renewed contract.
What We Handle
From a single drywall patch between tenants to a full rebuild after a claim — one vendor, one number, one documented trail.
Drywall, paint, flooring, fixtures, and resets — the small everyday calls, done fast and clean. The easiest way to put us to work, and documented on your portal like our other jobs.
Managing one building? See maintenanceMove-out to move-in between tenants, turned around fast so the unit's earning again sooner. Punch lists cleared, documented, and handed back ready to lease.
Full kitchens, baths, whole units, and common areas — multi-trade under one contract. Where permits are required, we coordinate the BCIN-qualified drawings too. These close out with a complete Owner's Manual and our 5-year warranty for the owner's file.
See our renovation workWater, fire, and mould managed from demo to rebuild. We document the damage, build the rebuild scope, and support you and the owner while you work with the adjuster — so a claim doesn't become one more thing you babysit.
Explore insurance restorationWhat You Get With Cornerstone
When a Claim Hits the Building
Water, fire, or mould in a managed building turns into a scramble of adjusters, scopes, and deadlines. Cornerstone manages the rebuild end to end and works for the property owner, so the claim doesn't become the one more thing you have to babysit.
A documented damage scope and the full rebuild, managed from demo to done. We support you and the owner while you work with the adjuster.
One contractor for the whole claim, documented for the owner and the file, so the building comes back right and the paperwork is organized.
Common Questions
Meet the Owner
The person who answers is the person accountable for the work in your buildings. Book 15 minutes and talk it through directly.
From the Founder
"Property managers can't afford a contractor who goes quiet. I show up, communicate, and get the work done right — so your tenants stay happy and your phone stops ringing."
— Mike Brock, Founder, Cornerstone Construction
Durham Region's trusted renovation contractor. Led by Mike Brock since 2017. We Listen, We Build, We Deliver.
