Property Management Partner

One Vendor for Every Building You Manage

Repairs, renovations, unit turns, and insurance restoration across your whole portfolio — on a locked price, a firm date, and documented so you can show your owners exactly what they paid for. One number that gets answered. One crew that shows up.

Set Up Your Vendor File

Free to set up · Usually cleared to assign work within a day · Durham Region & the GTA

One Number, Answered

Repairs, renos, turns, and claims — one contact for your whole portfolio. We pick up and show up, so you're never the last to know.

Locked Price + $300/Day

Budget locked from day one; we pay $300 a day if we miss the finish date. Give your owner a number that holds.

Documented for the Owner

Every job runs on a live portal you can forward straight to the owner — photos, approvals, invoices. The answer in writing, not a guess.

Backed in Writing

Full renovations close out with an Owner's Manual and a 5-year workmanship warranty — long after we hand the unit back.

Every Empty Day Is Lost Rent

The One Number You Call for Anything a Building Throws at You

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 never have to chase.

Why PMs Use Cornerstone

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.

What It Protects

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

Everything, Under One Contract

From a single drywall patch between tenants to a full rebuild after a claim — one vendor, one number, one documented trail.

01

Repairs & Maintenance

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 every other job.

02

Unit Turns & Make-Readies

Move-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.

03

Renovations & Capital Work

Full kitchens, baths, whole units, and common areas — multi-trade under one contract. These close out with a complete Owner's Manual and our 5-year warranty for the owner's file.

See our renovation work
04

Insurance Restoration

Water, fire, and mould managed end to end to IICRC S500/S520, coordinated with the adjuster, working for the owner from demo to done — so a claim doesn't become one more thing you babysit.

Explore insurance restoration

What Every Job Includes

The Cornerstone Certainty Stack

Price Lock + $300/DayBudget locked from day one; we pay if we miss the finish date.
Price Lock $300/Day
Live Client PortalTrack approvals, photos, and documents — and forward straight to the owner.
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Daily Cleanup + HEPAOccupied buildings stay clean and dust-free; tenants next door aren't disrupted.
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5-Year WarrantyWorkmanship on full renovations backed in writing.
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Owner's ManualRenovations close out with finishes, specs, and warranties in one handover.
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Licensed, Insured & WSIBA compliant Ontario corporation on every job, big or small.
See the full Certainty Stack

When a Claim Hits the Building

Restoration That Works for the Owner

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.

What Cornerstone Does

Fast mitigation through full rebuild — structural drying to IICRC S500/S520, a documented scope, and the work coordinated with the adjuster from demo to done.

What You Get

One contractor for the whole claim, documented for the owner and the file, so the building comes back right and the paperwork is already done.

See how Cornerstone handles restoration

Get Set Up

Set Up Cornerstone as a Vendor

One number, answered. Insurance, WSIB, and references on file so you're cleared to assign work — usually within a day. Hand us your first job and see how it runs before you hand us the portfolio.

Set Up Your Vendor File Call or Text 1-888-404-7383

Licensed & insured Ontario corporation · WSIB compliant · Serving Durham Region & the GTA since 2017

Durham Region's trusted renovation contractor. Led by Mike Brock since 2017. We Listen, We Build, We Deliver.

Service Areas

  • Oshawa, ON
  • Whitby, ON
  • Bowmanville, ON
  • Clarington, ON
  • Ajax, ON
  • Pickering, ON
  • Newcastle, ON
  • Scarborough, ON
  • Whitchurch-Stouffville, ON
  • Port Perry, ON
  • Peterborough, ON
  • Port Hope, ON
  • Cobourg, ON
  • Northumberland County, ON
© 2026 Cornerstone Construction. All rights reserved. Licensed & Insured Ontario Corporation Serving Durham Region Since 2017
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