Trenching Services in Markham — Utility, Drainage, Pool Lines

OCM Excavation runs trenching crews across Markham — from heritage Unionville to estate lots in Cathedraltown, the new builds in Berczy and Greensborough, and the rear-lane homes in Cornell. We cut clean, straight trenches for gas lines, electrical conduit, water service, weeping tile, downspout drains, and pool gas/electrical runs. Bedding goes in correct, conduit sits at the proper depth, and we backfill in lifts so the trench doesn’t sink on you a year later. Free quote: 416-317-3090.

Trenching jobs we run in Markham

Most of our trenching work in Markham falls into a few buckets, and we set up the dig differently for each:

• Pool gas and electrical trenches — heater gas from the meter, bonded pump electrical from the panel, low-voltage for lighting. Typically 18-24 inches for residential gas, 24 inches for electrical conduit. We coordinate with the pool builder so the trench is open when trades arrive.
• Drainage trenches — weeping tile, perimeter drains to a sump or street, downspout extensions buried to daylight. On Markham’s clay-loam, downspout drains keep basements dry through spring melt.
• Water service replacement — old galvanized or lead service from the curb stop to the house. We trench the front yard, the City does the curb-stop side.
• Utility trenches to a detached structure — garage, garden suite, pool house. Gas, electrical, water, data combined with proper separation.

How we trench in Markham — and why the backfill matters more than the dig

Step one is locates. We call ON1Call and wait for clearance before any blade touches dirt — Enbridge gas, Alectra hydro, Markham water, Bell/Rogers. On heritage Unionville streets we hand-dig the last few feet around marked utilities since locate paint isn’t precise enough to trust with a bucket.

For the cut, we match the machine to the job. Tight Berczy or Greensborough side-yards with 4-foot gates get our mini-excavator (see mini excavator services in Markham). Open Cathedraltown or new-construction Box Grove builds get a full-size machine. Either way, walls are straight, spoil is set on one side, and the bottom is graded flat.

Bedding is 4 to 6 inches of granular A or sand. Conduit, gas line, or pipe lays in, locator tape goes on top, then we backfill in 12-inch lifts and compact as we go. Markham’s clay-loam — especially in 2000s-2010s subdivisions on engineered fill — will settle hard if you dump the dirt back loose. We’ve been called to too many yards where someone else’s trench turned into a 6-inch trough six months later.

Markham neighborhoods we work in regularly

Each Markham pocket has its own access and soil quirks:

• Unionville — heritage district, mature trees protected under Markham Tree By-law 2023-164 (20cm DBH), tight side-yards.
• Cathedraltown — estate lots with rear access, long trench runs for pool and garden-suite utilities.
• Berczy and Cornell — landscaped backyards, 4-6 ft gates; Cornell’s rear-lane housing lets us stage from the lane.
• Greensborough, Box Grove, Markham Village — newer east-Markham subdivisions on engineered fill where compaction discipline matters, plus older Markham Village yards on natural clay.

If your property sits near the Rouge River corridor (parts of Box Grove and Cornell), TRCA Regulation 41/24 may apply and a permit is needed before digging. We handle the application.

What trenching costs in Markham

Pricing turns on linear footage, depth, soil, access, and whether the cut runs through interlock, concrete, or asphalt. Short utility runs to a backyard pool heater come in low. Long water-service replacements with 60+ feet of trench, interlock removal, and full restoration sit higher. We quote a fixed price after a site visit — call 416-317-3090.

Why Markham homeowners and builders call OCM

We’re a working excavation outfit, not a sub-of-a-sub. The crew that shows up is the crew that quoted the job. We carry our own equipment — mini-excavators for tight Markham yards, full-size machines for the open lots — and coordinate with the gas fitter, electrician, or plumber directly. See our full service-areas page for the rest of the GTA.

Frequently Asked Questions

How deep does a gas line trench need to be in Markham?

Enbridge’s residential standard is a minimum of 18 inches of cover, though the gas fitter installing the line specifies the exact depth for inspection. We dig to that depth and grade the bottom flat so the line lays without stress points.

Do I need a permit to trench across my own front yard in Markham?

Trenching on private property usually does not need a Markham building permit, but the work being installed — gas, electrical, plumbing, sewer — almost always does. If the trench crosses the City boulevard or hits the water-service curb stop, a separate City of Markham road-cut or service-connection permit is required.

Can you trench in a narrow Berczy or Unionville side-yard?

Yes. Our mini-excavator fits through gates as narrow as 36 inches and we hand-dig anything tighter. Mature trees in Unionville need root protection — Markham Tree By-law 2023-164 protects trees 20cm DBH or more.

What happens to the soil you dig out?

Spoil from utility trenches is usually clean enough to go right back in as backfill after we screen rocks and debris. If we’re cutting old fill or clay that won’t compact, we haul it off and bring in granular A. Markham Site Alteration By-law 2011-232 and Ontario’s O. Reg. 406/19 cover hauling.

Do you restore the lawn and hardscape after backfilling?

Yes. Rough-grade the trench line, top with screened topsoil, seed or sod. Interlock, concrete, or asphalt restoration is quoted line-by-line on the original estimate.

Do you locate utilities or do I have to?

We call ON1Call for every job — that’s on us, not the homeowner. Public utilities only. Private locates (gas to a pool heater, low-voltage to a shed) are extra and we flag if your property needs one.

Get a Free Trenching Quote in Markham

Whether it’s a single gas run to a pool heater in Unionville or a full utility trench for a new garden suite in Cathedraltown, we’ll come out, measure, check access, and quote a fixed price. Call OCM at 416-317-3090 or use our free quote form.

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