Retaining Walls in Burlington — Engineered, Permitted, Built to Hold

We build retaining walls across Burlington — from Aldershot slopes near the lake to Roseland’s mature lots, the terraced rear yards of Tyandaga, and escarpment-edge properties around Mount Nemo and Rattlesnake Point. Most Burlington walls we build are 0.6m to 2.4m tall, dealing with grade changes the original builder ignored. Walls over 1m exposed height typically need a Building Permit and engineered drawings under the Ontario Building Code. Call OCM at 416-317-3090 for a free site visit anywhere in Burlington.

Wall systems we build in Burlington

Burlington’s terrain ranges from flat clay flats south of Plains Road to steep escarpment shoulders north of Dundas, so we match the wall system to the load and the soil:

Segmental block (SRW) walls — Allan Block, Techo-Bloc Mini-Creta, Unilock Pisa. Best for 0.6m–2.5m on residential lots. Geogrid reinforcement on anything taller than ~1m.
Natural stone / armour stone — popular in Roseland and Tyandaga where homeowners want the wall to read as landscape, not infrastructure. Limestone blocks are 1–4 tonnes each; we set them with an excavator.
Poured concrete walls — when the load is high (driveway above, pool above) or the footprint is tight. Always engineered, always with proper rebar and weep drainage.
Timber / pressure-treated walls — short ornamental walls under 600mm only. We do not build tall timber walls; they rot and lean within 10–15 years.

Permits, OBC, and Burlington-specific overlays

The Ontario Building Code generally triggers a permit when a retaining wall exceeds 1.0m in exposed height. In Burlington, the permit goes through the city’s Building department. We prepare the application, coordinate the engineered drawings (P.Eng. stamp for the wall design), and meet the inspector on site.

Three Burlington-specific layers we screen for before digging:

Site Alteration By-law 064-2014 — regulates filling, grading, and excavation across Burlington. The Screening Checklist tells us whether the project needs a separate Site Alteration permit on top of the Building Permit.
Conservation Halton (Ontario Regulation 41/24) — if the lot is within 15–30m of a stable top of bank, a regulated watercourse, or floodplain, CH approval is required before any earthworks. Typical review is 30–90 days.
Niagara Escarpment Commission (Regulation 826/90) — Mount Nemo and Rattlesnake Point sit inside the NEC Area of Development Control. An NEC Development Permit is required for many works there. There is no fee to apply, but timelines run longer.

Burlington’s Private Tree By-law 040-2022 also kicks in inside the Urban Planning Area Boundary for trees 20cm DBH or larger. If our wall line is close to a protected tree, we adjust the alignment or apply for the tree permit before excavation.

How we build it — the OCM process

Site visit and survey check. We walk the slope, mark the wall line, and pull the lot survey to identify property lines, easements, and any escarpment or hazard overlay.
Engineered design for any wall over 1m, or any tiered wall system. The drawings go with the Burlington Building Permit application.
Locates and excavation. Ontario One Call locates take 5 working days minimum. Then we dig the footing trench — typically 150–300mm below frost depth for the wall base.
Base prep. 200–300mm of compacted ¾” clear stone, levelled to ±5mm across the run. This is where most failed walls failed — bad base.
Wall course and reinforcement. Block-by-block, with geogrid layers tied into compacted backfill every 2–3 courses on taller walls.
Drainage. Perforated 4″ drain tile at the base, wrapped in filter fabric, daylighted or tied to storm. Clear stone backfill behind the wall — never native clay against the back face.
Cap, restoration, grading. Cap units glued, surrounding grade pitched away from the wall, sod or seed reinstated.
Inspections and sign-off through the Burlington Building department.

What Burlington retaining walls typically cost

Costs vary with wall height, length, system, and access. Common Burlington ranges:

Short ornamental SRW wall (under 600mm, no permit) — usually a few thousand dollars depending on length.
Permitted SRW wall, 1m–1.8m with geogrid and drainage — mid five figures is common for a typical Roseland or Aldershot back-yard run.
Armour stone walls — priced per linear metre, with the stone itself a major cost driver.
Engineered poured concrete walls — the most expensive option, used where loads or geometry demand it.

We give a written, line-itemized quote after a site visit — no guesses over the phone.

Why Burlington homeowners hire OCM

We own the excavator, the compactor, and the truck. No subcontracted dig crew.
We handle the Burlington Building Permit, the Site Alteration screening, and the Conservation Halton or NEC paperwork when they apply.
We build walls that drain. Drainage is the difference between a 25-year wall and a 5-year wall.
We work across the GTA — see our full service areas — and we pair retaining wall work with land grading in Burlington when the lot needs both.

Frequently asked questions — Burlington retaining walls

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

Generally, yes once the exposed wall height exceeds 1.0m, under the Ontario Building Code. The City of Burlington Building department issues the permit, and the wall design needs a P.Eng. stamp. Walls under 1m, freestanding garden walls, may be exempt — but you still need to respect property lines, drainage, and any Site Alteration or Conservation Halton trigger on the lot.

Does Conservation Halton or the NEC affect my project?

It depends on location. Conservation Halton regulates lands within roughly 15–30m of a stable top of bank, watercourse, or floodplain under Ontario Regulation 41/24. The Niagara Escarpment Commission’s Regulation 826/90 covers properties on and around the escarpment, including Mount Nemo and Rattlesnake Point. We screen for both during the site visit and prepare the applications when they apply.

How long does a retaining wall take to build?

A typical 1.2m SRW wall, 10–15m long, runs about one to two weeks of on-site work once permits are in hand. Permits and engineered drawings add lead time before that — budget several weeks for a permitted job, longer if Conservation Halton or NEC review is needed. We give you a written schedule before we start.

How tall can a segmental block wall go?

Engineered SRW systems regularly go to 3m or higher with geogrid reinforcement, but in residential Burlington we recommend tiered walls rather than a single tall face when the slope allows it. Tiering reads better, drains better, and is often easier to permit. Anything above 1.0m exposed needs an engineer either way.

Can you replace a failing wall on a Tyandaga or Aldershot slope?

Yes. Most failures we see in Burlington are old timber walls or unreinforced block leaning forward because of bad drainage or no geogrid. We strip the old wall, rebuild the base, install proper drainage, and put up an engineered replacement. Where access is tight we use mini-excavators and skid-steers to protect mature landscaping.

Do you work the rural north end of Burlington?

Yes — we work everywhere from south Aldershot to the rural escarpment lots north of Dundas. The north end usually triggers the NEC overlay and sometimes Conservation Halton, so we factor those approvals into the schedule. The Private Tree By-law only applies inside the Urban Planning Area Boundary, so rural-zoned lots may not need a tree permit even where city lots would.

Get a quote on your Burlington retaining wall

If you have a failing wall, a slope that needs holding back, or a grading problem that a wall would solve, call OCM at 416-317-3090 or request a free quote. We’ll come out, walk the site, and tell you straight whether you need a permit, an engineer, a Conservation Halton review, or just a clean SRW build. Burlington homeowners get a written estimate within a few days of the site visit.