Retaining walls built to hold
Edwards Landscape & Construction is a North Bay contractor building retaining walls across the Nipissing district and into Muskoka. Walls run $3,000 to $35,000 depending on height, length and ground conditions, quoted in writing after an on-site visit. Height is the number that matters most: in North Bay a wall under 1 metre needs no building permit, and above that it does. Near water, a wall of any height can need conservation authority approval.
When a retaining wall needs a permit
This is where most retaining wall projects go wrong on paper rather than in the ground. Three separate thresholds can apply, and they are not the same rule.
| Situation | Threshold | What it means |
|---|---|---|
| City of North Bay building permit | Under 1 metre high | No building permit required. At or above 1 metre, one is. |
| Ontario Building Code designated structure | Over 1,000 mm exposed height, next to public property, building access, or property the public is admitted to | Must be engineered under Part 4, and guards are required where there is open space at the top. |
| Conservation authority permit | Any height, inside a regulated area | NBMCA names hardscape and retaining walls as permit-triggering. Regulated areas include shoreline, valleys, flood and erosion hazard land, and within 30 m of a wetland. |
| Muskoka, Huntsville, Sturgeon Falls | No conservation authority at all | Rules come from the municipality instead. Huntsville’s planning permit covers grading and fill town wide. |
| North Bay, Trout Lake shoreline | Named shoreline work | The City lists retaining walls among shoreline work needing approval before it starts. |
| Walls along a Muskoka District road | Material is specified | Must be heavy precast or reinforced cast-in-place concrete, and sit entirely on the property they retain. |
Zoning still applies even where no building permit is needed, and on projects where Edwards is the contractor the permits and approvals are handled as part of the job rather than left to the homeowner.
Why retaining walls fail
A retaining wall holds back soil, but the thing that actually pushes it over is water in that soil. Saturated ground behind a wall weighs far more than dry ground and exerts hydrostatic pressure the wall was never designed to take. Almost every leaning, bulging or blown-out wall traces back to one of four things.
- No drainage behind the wall. A clear stone drainage zone and a perforated pipe at the base give water somewhere to go. Without them, pressure builds every time it rains.
- A base above frost. Northern Ontario freeze-thaw heaves anything not founded deep enough, and a wall that lifts unevenly never sits back down square.
- Fill eroding from behind. On shoreline walls this is documented locally: the conservation authority’s Callander Bay study records that fill behind retaining walls erodes when waves surcharge the top of the structure, and that runoff off the slope above adds to it.
- Too steep a face, or no batter. The same study found older shoreline treatments built at steep slopes showing clear evidence of failure, while newer ones designed around a stable 3:1 slope held.
The fix is not a heavier block. It is drainage, a base below frost, proper compaction in lifts, and geogrid tied back into the retained soil once the wall gets tall enough to need it.
When a wall is the wrong answer
Worth saying plainly, because it will save some people money: a hard retaining wall is not always the right solution. North Bay’s own Trout Lake guidance points owners toward sloped rock rubble instead of a hard wall, and a floating dock instead of an in-water beach, because lower-impact treatments are easier to approve and behave better over time near water.
Where rip rap is the right call, it is not just dumped stone. The local guidance is specific: a wide gradation of stone sizes, and fines included so shoreline vegetation has a growing medium. Sometimes the correct answer is regrading the slope rather than walling it, and that gets said during the site visit rather than after the quote is accepted.
How much does a retaining wall cost in North Bay in 2026
Retaining wall projects run between $3,000 to $35,000 depending on height, length, access and ground conditions. What moves the number:
- Height. The single biggest driver. Crossing 1 metre can bring in a building permit and, in the wrong location, a stamped engineered design.
- Ground. Rock at or near the surface changes excavation from digging to breaking, which is common across Muskoka and around Mattawa.
- Access. A back garden a machine cannot reach is a wheelbarrow job, and that shows up in labour.
- Drainage and backfill. Clear stone, pipe and geogrid are not where to save money. They are the reason the wall is still straight in ten years.
- Approvals. Conservation authority or shoreline work adds time before a shovel moves.
Every quote is fixed and in writing after an on-site visit, with conditions flagged before the number is given. Edwards Landscape & Construction holds a 5.0 rating across 20 Google reviews and backs every build with a 3-year workmanship warranty.
Where Edwards builds retaining walls
North Bay is home base, and Edwards travels up to 150 km. The rules change as you go: North Bay has the 1 metre threshold, Callander and Corbeil sit under the conservation authority, and Muskoka, Huntsville and Sturgeon Falls have no conservation authority at all. See the full service area list.
Retaining walls are part of the wider hardscaping service, which also covers interlock driveways, paver patios, walkways and steps. Where a wall is really a grading or drainage problem, that sits with excavation and drainage.
Retaining wall questions, answered
Do I need a permit for a retaining wall in North Bay?
The City of North Bay lists retaining walls under 1 metre in height among the projects that do not require a building permit. Above 1 metre a permit is required. That threshold is only the municipal side: a wall near water can also need conservation authority approval regardless of height.
When does a retaining wall need to be engineered?
Ontario’s Building Code treats a retaining wall over 1,000 mm in exposed height as a designated structure when it is adjacent to public property, to access to a building, or to private property the public is admitted to. Designated structures must be designed under Part 4 of the Code, which means engineered, and guards are required where there is open space at the top.
Does a retaining wall near a lake need conservation authority approval?
Usually yes, in the areas that have a conservation authority. The North Bay-Mattawa Conservation Authority names landscaping that includes filling, re-grading and adding hardscape or retaining walls on its list of permit-triggering activities, and its regulated area covers shoreline, flood and erosion hazard land, valleys, wetlands and everything within 30 metres of a wetland.
Why do retaining walls fail?
Water, almost always. A wall holds back soil, but it is the water in that soil that generates the pressure. Walls fail when there is no drainage layer or perforated pipe behind them, when the base is not below frost, or when fill behind the wall erodes. On shoreline walls, waves overtopping the structure wash out the fill behind it, which is a documented failure mode on Callander Bay.
How much does a retaining wall cost in North Bay in 2026?
Most retaining wall projects run between $3,000 to $35,000 depending on height, length, ground conditions and whether the wall needs engineering. Height is the biggest driver: crossing the 1 metre mark can bring in a permit and, in some locations, a stamped design. Every quote is fixed and in writing after an on-site visit.
Rated 5.0 across 20 Google reviews
Kayden did an amazing job on our home renovation! He painted our home and updated our kitchen cabinets, and everything turned out beautifully. He was friendly, professional, and took great pride in his work. I would definitely recommend him to anyone looking for quality work!
The guys did a great job. Very happy with the end result. Highly recommend. Hard workers!
I'm very proud to say Kayden takes pride and satisfaction in the quality of work he does, from lawn care to landscaping.
Very professional and more than competitive in pricing!
Great service, super quick to respond and show up. Really appreciated their help. Did a great job.
Had Kayden from Edwards come over to aerate, feed and fertilize our backyard to continue his wonderful work from last year.
Got a slope that needs holding?
Send the basics and Kayden will get back to you personally, usually the same day during build season. Or call or text (705) 358-1169.
Free quotes. Fixed price in writing after an on-site visit.