Site Preparation in Markham — New Build, Addition, Foundation

We handle site preparation in Markham from the first walk-through to the day the forms go in. New custom home in Cathedraltown, a two-storey rear addition in Unionville, or a foundation dig in Cornell — we strip the lot, drop the trees you have a permit for, demo what’s standing, rough-grade for drainage, and hand you a clean pad ready for footings. Call 416-317-3090 for a free site visit and a written quote.

What site preparation in Markham actually covers

“Site prep” is a catch-all word, and on every Markham job it means something different. On a Berczy infill it’s a tight-access tear-down and a careful dig around a neighbour’s fence. On a Cathedraltown estate lot it’s clearing a full acre, stripping topsoil, and grading for a 6,000 sq ft footprint. Here’s what we typically roll into a site prep scope:

Demolition — full tear-down of the existing house, garage, shed, or pool. Disconnects coordinated with Alectra, Enbridge, and the City before the machines arrive.
Tree removal and protection — Markham’s Tree Preservation By-law 2023-164 protects any tree 20 cm DBH or larger. We pull the permits, drop what’s approved, fence what stays.
Clearing and grubbing — brush, stumps, root mats, old concrete, asphalt driveways, buried debris.
Topsoil strip and stockpile — black earth pulled and stored on-site for re-spread, or hauled off under O. Reg. 406/19 if you’re tight on space.
Rough grading and cut/fill — set the pad to the engineer’s elevations, slope for surface drainage, prep for the foundation contractor.
Excavation — full basement dig, crawl space, slab-on-grade, or addition footings. See our excavation contractor Markham page for the dig detail.
Servicing trenches — water, sanitary, storm, gas, hydro routed in before the slab pours.
Erosion and sediment control — silt fence, mud mats, catch-basin protection per the City’s site plan.

How a site prep contractor Markham project runs

On a typical Markham custom home or major addition, the sequence we run is straightforward. Day one we walk the lot with your designer or builder, pull utility locates, and stake the building envelope. Locates take 5 business days minimum — book early. Once Ontario One Call clears, we set up hoarding, silt fence, and a tracking pad at the curb so we don’t drag mud onto the street and trigger a City order.

Demolition runs 2 to 5 days for a typical Markham bungalow or two-storey. Clearing, grubbing, and topsoil strip is another 1 to 3 days depending on lot size. Excavation for a full basement on a standard Markham lot is usually 2 to 4 days in clay; longer if we hit fill, water, or shale. Rough grading and backfill prep wraps the prep phase. Plan on 2 to 4 weeks total from demo permit to ready-for-footings on most residential builds.

Markham neighbourhoods we work in

Every pocket of Markham has its own quirks, and we plan equipment and access around them:

Unionville — heritage district, mature protected trees, narrow side yards. Mini-excavator and tracked dumpers, careful tree-protection fencing, and slow demolition to keep neighbouring brick walls intact.
Cathedraltown — estate lots with room to swing a full-size excavator. Larger dig volumes, more spoil to haul, but easier staging.
Cornell — rear-lane housing means we can sometimes stage from the lane, keeping the front street clear. Tight setbacks, careful demo.
Berczy Village — 2000s-2010s subdivisions, landscaped backyards, 4-6 ft gates. Mini-excavator territory; sometimes a fence panel comes out and goes back in.
Box Grove and Greensborough — east Markham subdivisions near the Rouge. TRCA Regulation 41/24 may apply if you’re close to the valley — we check the screening map before we quote.
Markham Village and Milliken — mixed mature housing stock, varied soil conditions.

Permits, by-laws, and what trips up Markham builds

Three things stop more Markham site prep jobs than anything else: tree permits, site alteration approvals, and TRCA screening. Tree By-law 2023-164 protects anything 20 cm or larger at 1.37 m height — that’s a thinner tree than most homeowners assume. If you remove without a permit, fines run into the thousands per tree. Markham’s Site Alteration By-law 2011-232 governs how much soil you can move and where it goes; we work it together with O. Reg. 406/19 Excess Soil Management for hauling.

If your lot backs onto the Rouge corridor — most of east Markham, Box Grove, parts of Cornell — TRCA Regulation 41/24 likely applies. That means a TRCA permit on top of the City building permit, with valley setbacks, slope-stability work, and erosion control all reviewed. We’ve walked these files through before. Call 416-317-3090 and we’ll tell you on the first visit whether TRCA is in play.

Why Markham builders and homeowners hire OCM

We’re a contractor crew, not a sales office. The estimator who walks your Markham lot is the same person running the machines. We own our excavators, trucks, and breakers, so we’re not waiting on a sub to show up. We coordinate directly with your architect, structural engineer, surveyor, and foundation crew so the pad is at the right elevation the first time. And we know Markham — the inspectors, the planning office, the soil. Browse our other GTA service areas or jump straight to a free quote.

Frequently asked questions

Do I need a permit for site preparation in Markham?

You’ll typically need a demolition permit if a structure is coming down, a building permit for the new construction, a tree permit under By-law 2023-164 if any protected trees are affected, and a site alteration approval under By-law 2011-232 if significant soil is moved. TRCA permits apply near the Rouge corridor. We help coordinate the paperwork with your designer.

How long does site prep take on a Markham custom home?

For a typical Markham residential build — demolition, clearing, topsoil strip, full basement excavation, and rough grade — plan 2 to 4 weeks from the day we mobilize to ready-for-footings. Tight access in Unionville or heritage tree protection can stretch it. Estate lots in Cathedraltown move faster on the dig but have more material to haul. We give you a written schedule with your quote.

Can you work around protected trees in Unionville?

Yes. Markham’s Tree By-law 2023-164 protects trees 20 cm DBH and larger, and Unionville’s heritage district adds another layer. We install tree-protection hoarding outside the drip line, switch to hand-digging or air-spade work inside the root zone, and stage equipment off the protected area. If a tree must come down, we apply for the permit first — never after.

What does site preparation in Markham cost?

It depends on lot size, demolition scope, soil type, tree work, haul distances, and whether TRCA is involved. A simple Berczy infill prep is very different from a Cathedraltown estate clear. We don’t quote ballparks over the phone because they’re always wrong. Book a free site visit at 416-317-3090 and we’ll send a written, itemized quote within a few days.

Do you haul the excess soil and debris?

Yes. We haul demolition debris, concrete, asphalt, brush, stumps, and excavated soil. Soil hauling is handled under Ontario Regulation 406/19 Excess Soil Management — that means tracked source sites, receiving sites, and proper documentation. Markham’s Site Alteration By-law 2011-232 ties into this. We keep the paperwork so it doesn’t come back on you later.

Do you coordinate with my foundation contractor?

Always. We talk to your foundation, framing, and servicing crews before the dig starts so the pad elevation, over-dig allowance, and trench routing match what they need. On a tight Markham infill that coordination is the difference between a clean handoff and a week of standby charges. Your project manager keeps everyone on the same page.

Ready to break ground in Markham?

If you’ve got a Markham new build, a major addition, or a foundation project coming up, we’d like to walk the lot with you. Call 416-317-3090 or request a free quote and we’ll book a site visit. Bring your drawings if you have them — if not, we’ll work from a survey or a property map.