Retaining Wall Contractor in Toronto

We build retaining walls across Toronto — from a 600 mm garden tier in Riverdale to a 2.4 m engineered armour-stone wall holding up a Scarborough Bluffs back yard. OCM Excavation has been on Toronto sites since 2008. We handle the dig, the drainage, the engineering coordination, the Toronto Building permit, and the wall itself. If you’ve got a slope that’s moving, a back yard that’s eroding, or a grade change you want to terrace properly, call 416-317-3090 and we’ll come look.

Why Retaining Walls in Toronto Are Different

Toronto walls aren’t suburban walls. A few things change the job here:

• Scarborough Bluffs and top-of-slope. TRCA regulates the Bluffs hard. A new retaining wall inside the regulated area triggers an Ontario Regulation 41/24 permit, and in some setback bands TRCA can refuse a wall outright. Geotechnical input is usually mandatory.
• Don, Humber and Rouge ravine lots. If your property touches a Toronto ravine, Chapter 658 (Ravine and Natural Feature Protection) applies before any digging. Replacing an old wall, building a new one, or even regrading near the top-of-bank needs a ravine permit, and TRCA gets a say.
• Forest Hill, Rosedale, Lawrence Park grade. Estate lots here often drop 0.5 m to 3 m front-to-back. Walls aren’t decoration — they’re holding driveways, pools, and side yards.
• Chapter 813 and mature trees. Toronto’s private tree by-law protects any tree at 30 cm DBH or larger, with fines from $500 up to $100,000 per tree. Tree Protection Zones change where we can excavate and how the wall lays out.
• Heritage Conservation Districts. Cabbagetown, the Annex, parts of Rosedale and Riverdale — these favour natural stone and armour stone over engineered grey block. Material choice is part of the approval, not just aesthetics.
• Downtown access. A 4 to 5 ft side yard between Victorian semis means no skid steer and no full-size dump truck. Block, stone, and excavated soil move by wheelbarrow or a mini-loader, and that affects price.

Toronto Neighbourhoods We Build Walls In

Forest Hill, Rosedale, Lawrence Park, The Beaches, Cabbagetown, the Annex, Riverdale, Leaside, Scarborough Bluffs, Birch Cliff, Guildwood, Bayview Village, Willowdale, North York, Etobicoke, Long Branch, Mimico, High Park, Roncesvalles, Bloor West Village. If you’re inside the City of Toronto, we’ll get to you.

Types of Retaining Walls We Build in Toronto

• Segmental concrete block (Allan Block, Versa-Lok, Unilock). Our most common Toronto wall. Engineered systems with geogrid reinforcement, good for 0.5 m to 3 m heights, predictable cost, fast install.
• Armour stone. Big natural limestone blocks (300-1500 kg). Heritage Conservation Districts and ravine naturalization projects favour these — they read natural, they last forever, and TRCA tends to prefer them on Bluffs and ravine edges.
• Poured concrete. Heavy structural walls where a basement walkout, side-yard driveway, or pool deck has to hold serious load. Costs more, lasts longest.
• Gabion baskets. Wire cages filled with stone. Industrial look, excellent for drainage-heavy sites and the back side of Scarborough Bluffs properties.
• Pressure-treated timber. Short garden tiers under 600 mm only. We’ll build them where they make sense, but we won’t pretend they’re a structural answer.

Our Toronto Retaining Wall Process

1. Site walk and design. Measure the slope, check the soil, look at trees, check for ravine designation. We’ll tell you on day one whether this is a permit job or not.
2. Geotechnical review. Standard on the Scarborough Bluffs, common on Forest Hill and Rosedale estate slopes, often skipped on a 700 mm garden wall in Leaside.
3. P.Eng stamp. Required for any wall over 1.0 m exposed height under the Ontario Building Code and Toronto Building rules.
4. Toronto Building Permit. Anything above 1.0 m exposed needs one. We file it. We also pull the Chapter 658 ravine permit if you’re on a ravine lot, and the TRCA Ontario Regulation 41/24 permit on Bluffs or regulated ravine land.
5. Excavation and bench cut. We bench the slope, compact the base, lay 150-200 mm of clear stone leveling pad.
6. Drainage. Perforated drain tile behind the wall, wrapped in filter cloth, daylighted or tied to a storm connection. This is what separates a wall that lasts 40 years from a wall that bulges in 5.
7. Wall build and backfill. Block or stone laid, geogrid pinned every 2-3 courses, free-draining 19 mm clear stone backfill, capped, and graded out.
8. Restoration. Topsoil, sod, plantings, fence reset if needed.

What Affects Retaining Wall Cost in Toronto

• Wall height and length (cost climbs fast above 1.2 m because of engineering and geogrid)
• Material — segmental block is the cheapest per square foot, armour stone and poured concrete cost more
• Downtown side-yard access — a wheelbarrow job carries a surcharge over a skid-steer job
• Chapter 813 protected trees on site — Tree Protection Zones can add hand-dig and consulting arborist cost
• Ravine or Bluffs designation — TRCA review and Chapter 658 ravine permits add weeks and engineering hours
• Heritage Conservation District — material approval can mean armour stone where block would have been cheaper
• P.Eng fees on walls over 1.0 m
• Toronto Building Permit fees (City sets the rate, we pull the permit)
• Disposal — Toronto soil disposal isn’t cheap, and ravine-adjacent excavated soil may need analytical testing before it leaves site

For the full breakdown of how we build retaining walls across the region, see our retaining wall construction page. For sites where the wall is part of a bigger dig — pool, basement walkout, drainage — our Toronto excavation page covers the equipment side. Heritage and ravine projects often pair with our armour stone installation work.

Frequently Asked Questions

Do I need a permit for a retaining wall in Toronto?

Under the Ontario Building Code and Toronto Building rules, any retaining wall with an exposed height over 1.0 m above finished grade needs a building permit and engineered drawings. Walls under 1.0 m generally do not — but if you’re on a ravine lot under Chapter 658, or inside a TRCA regulated area on the Bluffs, you may need permits regardless of height.

What’s the rule near the Scarborough Bluffs?

The Bluffs sit inside TRCA’s regulated area under Ontario Regulation 41/24. New retaining walls, replacement walls, and regrading all need a TRCA permit, and walls inside the top-of-slope setback can be restricted or refused. Geotechnical engineering is effectively standard. Confirm your property’s status with TRCA staff before you commit to a design.

What material do you recommend for Forest Hill or Rosedale?

It depends on the slope and the look the property calls for. Engineered segmental block (Allan Block, Versa-Lok) handles heavy structural loads at the lowest cost. Armour stone reads more natural and tends to suit heritage streetscapes and estate landscaping. Inside the Heritage Conservation District side of Rosedale, expect material to be part of the approval conversation.

Will mature trees on my Toronto property affect the wall?

Yes. Toronto’s Chapter 813 private tree by-law protects any tree 30 cm DBH or larger, with fines up to $100,000 per tree. We plan the wall layout around Tree Protection Zones, hand-dig inside the root zone where required, and coordinate with Urban Forestry if the wall has to come close. Sometimes the wall alignment shifts a metre to save a tree — cheaper than the fine.

Call OCM for a Toronto Retaining Wall Quote

If you’ve got a slope that needs holding — anywhere from Long Branch to Guildwood — call 416-317-3090 or send the details through our free quote form. We’ll come out, walk the site, and tell you straight what the wall, the permits, and the disposal are going to run.

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