Site Preparation in Richmond Hill — New Build, Addition, Foundation

We do site preparation in Richmond Hill for new custom homes, second-storey additions, detached garages, slab-on-grade workshops, and accessory dwelling units. Strip topsoil, rough grade to design elevation, cut and fill, compact subgrade, and hand a clean pad to your framer or foundation crew. Richmond Hill is our home base — Yonge, Bayview Hill, Oak Ridges, South Richvale — so dispatch is fast. Call 416-317-3090 for a free site visit and a written scope before machines roll.

What site preparation actually covers

Site prep is everything between a surveyed lot and a footing-ready pad. On a typical Richmond Hill build, that is:

• Stripping 150–300 mm of topsoil across the building footprint and stockpiling it for re-spread.
• Cutting high spots and filling low spots to match the surveyor’s grading plan.
• Removing tree stumps, old slabs, buried fuel tanks, and forgotten field tile.
• Compacting the subgrade in lifts so the footing sits on dense, undisturbed bearing.
• Cutting basement, garage, or crawl-space excavations to design depth.
• Setting up sediment control, mud-mat driveway, and a clean site office pad.

A site prep contractor in Richmond Hill who skips the compaction step is the one your structural engineer phones about six months later. We compact in 200–300 mm lifts and proof-roll before we walk away.

Richmond Hill ground conditions we plan for

Richmond Hill is not one soil. West of Yonge through South Richvale and Mill Pond, we hit heavy clay that holds water and heaves in spring — drainage and proper sub-base matter more than the equipment list. Bayview Hill estate lots run sandier with steeper grade transitions; cut-and-fill volumes go up. North of Bloomington Road we are on the Oak Ridges Moraine, where slope, permeable cover, and vegetation rules shape every pad we cut. East-side ravine lots backing onto Don Valley tributaries fall under TRCA Regulation 41/24 — top-of-bank setbacks are not negotiable.

Permits, by-laws, and what we hand the city

Your building permit covers the structure. Site prep itself can trigger Site Alteration By-law 47-25 when fill volumes or grade changes are meaningful — common on South Richvale infill teardowns where the new pad sits 300–600 mm above original. We coordinate the grading plan with your surveyor and Richmond Hill Building Services so the topo, sediment control, and haul routing are approved before a tracked machine shows up. If your retaining context needs an exposed face over 1.0 m, that is a separate engineered design under the OBC — we will tell you up front, not after the fact.

Our process from quote to pad

1. Site visit. We walk the lot with your architect’s drawings and the surveyor’s SPP. Free, no obligation.
2. Written scope. Topsoil depth, cut/fill volumes, haul-off truckloads, compaction spec, sediment control. No vague allowances.
3. Locates and pre-start. Ontario One Call locates, tree protection fencing, and any required notice to the city.
4. Strip and stockpile. Topsoil to a designated corner, segregated from any unsuitable material.
5. Cut, fill, compact. Engineered fill where required, density-checked subgrade.
6. Foundation excavation. Footing trench or basement dig to elevation, square corners, clean bench.
7. Hand-off. Pad walk with your foundation contractor. We do not leave until they are happy.

Equipment we bring to Richmond Hill jobs

Tight Mill Pond lots and Observatory infills get compact track loaders and 3.5–8 tonne excavators. Bayview Hill estate cuts get 14–20 tonne machines and tandem haul trucks. Oak Ridges moraine pads often run with low-ground-pressure tracks to limit disturbance outside the building envelope. Whatever the lot, we size the iron to the access — we do not crush your neighbour’s curb getting in.

Why builders call OCM for site prep in Richmond Hill

• Richmond Hill home base — site visits within days, not weeks.
• One crew handles strip, grade, excavate, and backfill. No baton-passing between subs.
• Written scopes that match the surveyor’s numbers — your foundation contractor inherits a pad that fits the drawings.
• We coordinate directly with TRCA when the lot touches a regulated area.
• Clean site discipline — sediment control, mud-mat, daily street sweep.

See our broader excavation contractor work in Richmond Hill and the full GTA service area list.

Frequently asked questions

How long does site preparation take on a typical Richmond Hill build?

A standard infill teardown pad in South Richvale or Mill Pond runs 3–7 working days from strip to footing-ready, weather depending. Bayview Hill estate cuts with significant cut/fill or ravine constraints can stretch to two weeks. Additions and detached garages are usually 1–3 days. We give you a day count in the written scope, not after.

Do I need a permit for site prep before my building permit is issued?

Often, yes. Richmond Hill’s Site Alteration By-law 47-25 can trigger separate approval when you are moving meaningful fill or changing grade — even before the building permit lands. Topsoil strip and small grade tweaks usually do not. We review your specific scope against the by-law and tell you which path applies before quoting.

What if my lot backs onto a ravine or the Oak Ridges Moraine?

East-side Richmond Hill ravine lots fall under TRCA Regulation 41/24 — top-of-bank setbacks, sediment control, and sometimes a permit from TRCA in addition to the city. North of Bloomington Road, Oak Ridges Moraine rules layer on slope, vegetation, and permeable-cover protections. We have worked both. Send us the address and we will tell you what applies.

Can you haul off the excess soil, or do I arrange that?

We handle haul-off. Truckload counts are in the written scope, and we route to licensed receiving sites with proper documentation — important if your lot ever ends up in a soil-quality audit. Reusable topsoil is stockpiled on-site for landscape re-spread when the build wraps.

Do you work directly with my builder or with me?

Both. About half our Richmond Hill site prep work is sub-contracted to custom builders; the other half is direct to the homeowner who is acting as their own general. Either way, the written scope, locates, and city coordination are ours. Call 416-317-3090 and tell us which role you are in.

What separates good site prep from cheap site prep?

Compaction discipline, drainage thinking, and elevation accuracy. A cheap crew strips topsoil, dumps fill, and leaves. Six months later your footing has settled 25 mm on one corner and your framer is shimming. We compact in lifts, proof-roll the subgrade, and shoot elevations against the surveyor’s plan before we hand the pad over.

Book your Richmond Hill site preparation quote

If you are breaking ground in Richmond Hill — new custom build, second-storey addition, detached garage, slab-on-grade workshop — call OCM at 416-317-3090 or use our free quote form. Send the surveyor’s SPP and your architect’s site plan and we will come back with a real number, a real day count, and a written scope your foundation contractor can build on.

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