Do I need a permit or an engineer for a retaining wall in BC?
The council's bylaws decide: Kamloops and Abbotsford ask for a building permit and an engineer's design for a wall over about 1.2 m, or stepped walls close together.
Opens the report at this answer. A PID always finds the lot; an address needs an exact match.
What the answer means
A retaining wall holds back a slope so a house, driveway or yard can sit level. Walls fail when they aren't built for the ground and its water, and a tall one that fails can take the yard, the driveway or the neighbour's with it, so many councils want an engineer to design and check the tall ones.
- Whose rule it is
- No single BC height decides it: the council's building bylaw says when a wall needs a permit, and its zoning bylaw where a wall may stand and how high (our reading; ask the building department). Where a registered professional designs a wall, councils ask for the BC Building Code's letters of assurance (Schedule B), which commit them to the design and to reviewing the work.
- Kamloops, as one example
- The City of Kamloops asks for a registered professional to design and field-review the construction and drainage of a retaining structure over 1.2 m high, a sequence of walls of any height closer than two horizontal to one vertical, a wall that supports another building or structure, and where the City finds drainage or geotechnical concerns. Its permit application asks for a title search with the charges on title, a site plan and sealed drawings.
- Abbotsford, as another
- The City of Abbotsford asks for a building permit and a geotechnical or structural engineer for a wall 1.2 m or higher, or a series of walls over 1.2 m in all. Stepped walls need neither when both together are under 1.2 m, or each is under 1.2 m and set back twice the height of the one below. A wall over 1.2 m added after the lot's grading plan was approved keeps the zone's setbacks for accessory structures, and a fence within 1.0 m of a wall counts with it (Zoning Bylaw s. 140, as the City's page says).
- Hazard areas and covenants
- A steep slope or hazard development permit area can need a permit before any wall (see development permit areas), a covenant on title can forbid walls outright, and on land that may slide or erode the building inspector can ask for a geotechnical report (Community Charter s. 56; see geotechnical reports).
- Fill, streams and the ALR
- Soil brought in behind a wall on ALR land counts toward the fill the ALR allows (see fill and soil), and a wall by a stream or lake meets the streamside rules (see streamside setbacks).
- On the lot line
- A wall belongs to the owner of the land it stands on (the City of Abbotsford says so of walls between neighbours). One that crosses the line is an encroachment, which a court can settle by easement, transfer or removal (Property Law Act s. 36; see encroachments).
- What it means for a buyer
- A tall wall with no permit or engineer's letter is a question to settle before you remove subjects: rebuilding one to a design costs far more than a fence (our reading). Look for bulging, cracks, leaning and water seeping through, and have an engineer look at a wall that worries you.
Our summary of the City of Kamloops' retaining wall permit page, the City of Abbotsford's retaining walls FAQ and the Community Charter (SBC 2003, c. 26, s. 56) and Property Law Act (RSBC 1996, c. 377, s. 36) on BC Laws, read 2026-10-21. Other councils set their own heights and rules; that no BC height decides it is our reading.
Sources, read 2026-10-21 and summarised in our words unless marked otherwise: Residential retaining wall permit, City of Kamloops; Retaining walls: frequently asked questions, City of Abbotsford; Community Charter, s. 56 (requirement for geotechnical report); Property Law Act, RSBC 1996, c. 377, s. 36.
Before you buy: who to ask
- The seller or their agent
- Who built the retaining walls and when, was there a building permit, and is there an engineer's design and field review letter?
- The local government
- Is there a permit for the walls on file, and what height needs a permit and an engineer here?
- Your lawyer or notary
- Does a covenant on title limit walls or grading, and does any wall cross the lot line?
- Your home inspector or a specialist
- Is any wall bulging, cracked, leaning or seeping, and should an engineer look at it?
Look up the lot above: its report gives the slope across the lot, terrain stability where it's mapped, and the development permit areas over it.
See also steep lots, geotechnical reports, fences between neighbours, fill and soil, encroachments and building permits.