Emergency Excavation in Markham, ON | OCM Excavation

Call OCM at 416-317-3090 now if sewage is coming up through your Markham basement drains, a sinkhole has opened in your yard or driveway, or water is gushing out of the ground between the street and your house. Our 3-person crew mobilizes with a Yanmar SV40 mini-excavator, and we are on-site at most Markham addresses within one to two hours of dispatch. This page lays out what we handle, what it will cost, and what you need to do in the next ten minutes.

What Emergency Excavation Covers in Markham

Markham is a tale of two infrastructures. Markham Village, Unionville, and the original Thornhill side still run on 1960s-era sewer laterals — many of them clay, many of them past their service life. Cornell, Berczy, and the newer Wismer builds are all-PVC and rarely fail. The emergency calls we see in Markham concentrate on the older neighbourhoods and look like this:

• Sewer line collapse with backup through basement floor drains — overwhelmingly the most common call from Markham Village and Unionville.
• Water main break on the private lateral, often at the curb stop or where the line transitions from copper to plastic.
• Sinkhole formation in the yard or driveway from a broken old sewer pipe washing fill away beneath grade.
• Foundation crack with active water intrusion in older Markham homes during heavy rain, where the original parging and weeping tile have both failed.
• Failed weeping tile after a heavy storm — water builds against the foundation faster than the choked drain can move it.

How Fast We Get To You

For Markham calls received before 2 PM on a weekday, we put a crew on-site the same day for about 90% of emergency dispatches. After-hours and overnight calls are scheduled for first thing the next morning unless the situation is actively destroying property, in which case we mobilize an after-hours crew at premium rates. The 404 and 407 get us into Unionville, Cornell, Markham Village, and Cathedraltown quickly. The SV40 is on the float and rolling within thirty minutes of address confirmation.

Emergency Pricing in Markham

Emergency work is priced differently from scheduled jobs. Permits need expediting, crews work overtime, and we cannot pre-stage materials. Plan for an emergency response fee of $1,500 to $5,000, plus $200 to $350 per hour of crew time, plus materials and permits. A typical Markham sewer lateral replacement runs $9,000 to $24,000 depending on depth, run length, and surface restoration. Interlock and stamped concrete cost more to break and rebuild than asphalt. You receive an itemized invoice formatted for an insurance claim.

What You Need To Do Before We Get There

• Call OCM at 416-317-3090 and stay on the line so we can walk you through what to do in the next few minutes.
• If it is a water main break, shut your water off at the main valve where the line enters the basement.
• If it is a sinkhole or suspected sewer collapse, call the City of Markham contact centre at 905-477-7000 so the municipality can dispatch their crew for the street-side portion of the lateral.
• Take photos and short videos of the damage from multiple angles for your insurance claim.
• Move valuables and electronics off the basement floor. Stay out of standing sewage water.

The Insurance Picture

Most Markham homeowner policies cover sewer backup only when you carry the specific rider, and limits are often capped well below actual remediation costs. The structural repair itself — the broken lateral, the excavation, the new pipe — is typically not covered. Sinkhole subsidence is a rare add-on. We do not bill insurance directly. We provide a detailed itemized invoice with photos, dimensions, and material specs, so your broker can evaluate and process a clean claim.

FAQ — Emergency Excavation in Markham

How fast can you reach Unionville or Markham Village?

Generally one to two hours during business hours, slightly longer for Cathedraltown and the east end of Cornell. After-hours dispatches are scheduled for the following morning unless property is being actively destroyed. We work weekends for true emergencies at premium rates.

Who handles the city-side repair?

The City of Markham handles failures on their side of the property line. Call 905-477-7000 to report. They only accept reports from the property owner, not from contractors. We coordinate with their crew once they are on-site.

Will insurance cover the dig?

Usually not the structural pipe repair. Finished-basement water damage is often covered if you carry the sewer-backup rider. We provide claim-ready documentation so your broker has the best chance of partial reimbursement for the cleanup portion.

Can you dig in deep winter?

Yes. Markham frost depth runs around four feet. We bring frost rippers and heated enclosures and dig year-round. Winter work costs more because production slows, but emergencies do not pause for the season.

My Cornell home is brand new. Why would my line fail?

Newer Markham homes rarely have full collapses. When they do, it is almost always at a fitting, a transition, or a point where the bedding settled unevenly during backfill. We cut out the failed section and re-pipe with new PVC.

Call OCM Now

If sewage is rising, the yard is sinking, or water is pouring out somewhere it should not be, call 416-317-3090 now or request a callback through our free quote page. See our full service areas, sibling emergency pages in Richmond Hill and Vaughan, our French drain page for Markham, and our Markham excavation contractor page for non-emergency work.

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