Coquitlam's 2025 small-scale residential zones (R-1 to R-4, adopted June 9, 2025) cover most standard single-family lots, and the bylaw's definition of small-scale residential expressly includes detached forms. Lots that kept legacy Part 22 RS zoning — notably inside Transit-Oriented Areas, which retained their existing zoning — do NOT permit a detached suite: a secondary suite there must be inside the main house. Two site factors matter a lot here: building on or near a slope steeper than 18 degrees (32%) requires a Slope Hazard Assessment, and lane access flips the rear setback from 6.0 m down to 1.2 m.
Rules verified 2026-08-02 · Pre-screening only, not a permit determination.
Each statement below was read from the document it links to, on the date beside it. Where the wording is precise, that is because the bylaw is.
The 10 zone codes we have mapped for Coquitlam, and the reading recorded for each. The list can include commercial, industrial, agricultural and site-specific codes, so its length is not necessarily a count of residential zones. This is a statement about the zone, not a verdict on any particular lot, and it is not the whole bylaw — a zone that is not listed here has not been read individually.
Likely the reading recorded for this zone is favourable. Conditional favourable in principle here; whether one fits is a lot-level question. Needs review this zone has to be read on its own, usually because it is site-specific. Unlikely the reading recorded for this zone is not favourable.
| Zone | Detached suite | Why |
|---|---|---|
| R-1 | Likely | Small-Scale Residential (s.1002) — one or more principal buildings permitted per lot, so a detached rear dwelling is lawful; it is a PRINCIPAL building at up to 3 storeys / 11.0 m with 6.0 m separation (not the 3.7/4.6 m accessory-shed cap). FAR 0.65 for 1-2 units, 0.75 for 3-4. |
| R-2 | Likely | Compact Small-Scale Residential (s.1003) — up to two principal buildings; FLAT 0.75 FAR (not a 0.65-0.75 band); min lot 465 m2, min width 12.5 m; 3 units where lot <=280 m2. |
| R-4 | Conditional | Intensive Small-Scale Residential (s.1005) — more than one principal building may be located on a lot, but the zone requires a MINIMUM of three dwelling units (s.1005(3)(a)) on a minimum 930 m2 lot (s.1005(4)(a)); height 9.5 m / 11.0 m pitched. Not an 'add one suite' zone. |
| RT-3 | Conditional | Legacy MULTIPLEX Residential (Part 22 s.2207) — principal use is multiplex residential: three or more principal dwelling units in attached, DETACHED or semi-detached forms (min lot 930 m2, FAR 0.85). No carriage-house/garden-cottage accessory use, but the detached form is available through multiplex itself. |
| RT-1 | Needs review | Legacy Infill Residential (Part 22 s.2206) — the one legacy zone that expressly permits a carriage house or garden cottage, BUT only on lots designated Neighbourhood Attached Residential or Baycrest Low Density Residential in the Partington Creek Neighbourhood Plan (NE Coquitlam). RT-1 lots elsewhere in the city do not carry that designation, and we cannot read the plan designation from records yet — so a specialist confirms it rather than us calling it. Where it applies: one carriage house OR one garden cottage (not both), max 90 m² or the principal building's floor area, rear yard only. |
| R-3 | Unlikely | Transitional Small-Scale Residential (s.1004) — s.1004(7) permits only ONE principal building per lot, and detached accessory buildings are capped at 3.7/4.6 m, so a detached laneway home is not permitted here. The zone's 2 principal + 2 accessory units (FAR 0.50) must be carried in attached forms. |
| RS-1 | Unlikely | Legacy One-Family Residential (Part 22 s.2203, lands zoned RS-1 as of June 30, 2025 — notably in Transit-Oriented Areas, which retained existing zoning). Only one principal building per lot, and any secondary suite must be contained WITHIN the principal building, 'not in a detached accessory building' (s.2202(2)) — the bylaw already says no to a detached laneway home. |
| RS-2 | Unlikely | Coquitlam Bylaw 3000 s.1001(9)(a): "An accessory dwelling unit must be contained within a principal building for a single-detached dwelling use", and s.1001(7) permits no more than one principal building per lot — so RS-2 allows an interior suite only, never a detached one. Corrected 2026-08-06 from primary text; this entry previously read 'conditional' on the basis that RS-2 allowed one accessory dwelling unit, which is true but not of a DETACHED one. |
| RS-3 | Unlikely | Legacy One-Family Residential (Part 22 s.2204, min lot 555 m2) — same rule as RS-1: suite inside the principal building only; no detached unit. |
| RS-4 | Unlikely | Legacy One-Family Compact Residential (Part 22 s.2205, min lot 375 m2) — same rule as RS-1: no detached unit. |
R-1/R-2: a detached dwelling is a principal building — up to 3 storeys / 11.0 m with a 6.0 m separation between principal buildings (9.0 m where both are three storeys at the facing wall); FAR 0.65-0.75 (R-1) or flat 0.75 (R-2) site-wide. Setbacks in R-1: front 5.5 m; rear 6.0 m without a lane but 1.2 m along a lane; interior side 1.2 m. Slope: no building on or near the crest/toe of a slope steeper than 18 degrees (32%) without a Slope Hazard Assessment (Part 5 s.519(3)). Servicing: connection to municipal services required (s.511(2)); private septic ADU only with written capacity confirmation (s.508(2)). Provincial SSMUH exemptions (lots >4,050 m2, no municipal water+sewer, heritage, certified hazard) sit on top.
| Build | Planning estimate |
|---|---|
| One bedroom | $365,000 |
| Two bedroom | $495,000 |
| Utility connections, on top | $30,000 – $80,000 |
These are KYRAX's own mid-range planning figures, not Coquitlam's and not a quote. They are for working out whether the idea is worth pursuing. Real quotes for a completed build in this region have ranged from roughly $275,000 to $840,000 depending on size, site access, servicing and finish, and only a site visit narrows that.
| Suite | Indicative band |
|---|---|
| One bedroom | $2,050 / month |
| Two bedroom | $2,600 / month |
Indicative band for Coquitlam as of 2026-07, drawn from: Zumper Coquitlam asking rents, July 2026 (1BR $2,088 / 2BR $2,683); CMHC RMS Oct 2025 Tri-Cities zone purpose-built average 1BR $1,708 / 2BR $2,177 cited as the conservative floor No survey measures laneway suites specifically, so these describe comparable rentals rather than laneway homes as a class.
This page is the rule for the zone. Your lot is specific — its width, what is already built on it, and how it is serviced all change the answer. The check reads Coquitlam's own zoning and parcel data for your address, then tells you which of those things it could and could not confirm.
Coquitlam's 2025 small-scale residential zones (R-1 to R-4, adopted June 9, 2025) cover most standard single-family lots, and the bylaw's definition of small-scale residential expressly includes detached forms. Lots that kept legacy Part 22 RS zoning — notably inside Transit-Oriented Areas, which retained their existing zoning — do NOT permit a detached suite: a secondary suite there must be inside the main house. Two site factors matter a lot here: building on or near a slope steeper than 18 degrees (32%) requires a Slope Hazard Assessment, and lane access flips the rear setback from 6.0 m down to 1.2 m.
R-1/R-2: a detached dwelling is a principal building — up to 3 storeys / 11.0 m with a 6.0 m separation between principal buildings (9.0 m where both are three storeys at the facing wall); FAR 0.65-0.75 (R-1) or flat 0.75 (R-2) site-wide. Setbacks in R-1: front 5.5 m; rear 6.0 m without a lane but 1.2 m along a lane; interior side 1.2 m. Slope: no building on or near the crest/toe of a slope steeper than 18 degrees (32%) without a Slope Hazard Assessment (Part 5 s.519(3)). Servicing: connection to municipal services required (s.511(2)); private septic ADU only with written capacity confirmation (s.508(2)). Provincial SSMUH exemptions (lots >4,050 m2, no municipal water+sewer, heritage, certified hazard) sit on top.
As a planning estimate, around $495,000 for a two-bedroom build and $365,000 for a one-bedroom, plus utility connections. These are KYRAX's own mid-range figures for budgeting, not Coquitlam's and not a quote — real quotes in this region have ranged from roughly $275,000 to $840,000.
An indicative band for Coquitlam is about $2,050 a month for a one-bedroom and $2,600 for a two-bedroom, as of 2026-07. No survey measures laneway suites specifically, so that is drawn from comparable rentals: Zumper Coquitlam asking rents, July 2026 (1BR $2,088 / 2BR $2,683); CMHC RMS Oct 2025 Tri-Cities zone purpose-built average 1BR $1,708 / 2BR $2,177 cited as the conservative floor
The reading recorded as favourable covers R-1, R-2. Others are conditional, need individual review, or are not favourable; the table above lists all 10 zones that were read. Which zone your lot is in is what the address check resolves.
When you enter an address, the check reads Coquitlam's own parcel and zoning data for that specific lot. It resolves the parcel, reads the zone, and tests whether a suite of the size the bylaw permits fits behind the existing house once coverage and setbacks are taken out.
It reports what it could not establish as plainly as what it could. A favourable answer requires a real zoning read — the absence of an objection is not treated as a permission. Pre-screening only, not a permit determination.
BC Building Code 2024 · checked 2026-09-10
Outside the City of Vancouver, a laneway home in the Lower Mainland is designed to the BC Building Code 2024, which took effect on 8 March 2024 and is based on the National Building Code of Canada 2020. It applies to projects whose building permit was applied for after that date, so the edition that governs your build is fixed by when you apply, not by when you break ground.
The 2024 edition's earthquake design and adaptable dwelling requirements did not arrive with the rest of it. The 2018 rules stayed in force for permits applied for up to 9 March 2025, and from 10 March 2025 the 2024 requirements apply to all new projects. A set of drawings prepared under the older seismic rules is therefore only still usable if the permit application beat that date.
Projects already in stream when the edition changed can qualify for an extended exemption running to 8 March 2027. If a design has been sitting for a couple of years, which edition it was drawn to is worth confirming before it goes any further.
Coquitlam is not listed in the provincial table. The City publishes its own values and requires building permit applications to use them. Its guide puts the 1-in-50 ground snow load at 2.6 kPa between 0 and 100 m, rising band by band to 5.7 kPa between 401 and 425 m — more than double within the one municipality. Above 425 m it sends designers to the appropriate agencies for data.
The guide is dated March 2021, and its snow table is titled for the BC Building Code 2018 and dated June 2019. The City had not published a version for the 2024 code when this page was checked, so confirm with the City which values apply before design starts. For comparison, at the stations the provincial table lists elsewhere in the region, the ground snow load runs from 1.3 kPa at Ladner to 2.9 kPa at Burnaby (Simon Fraser Univ.) — more than double.
These are ground loads for a band of elevation, not the load on a roof: the code derives roof loads from them. The designer of record works out the value for the actual site.
Code editions, effective dates and station design values. The values for a specific building are for its designer of record. www2.gov.bc.ca · verified 2026-09-10 · www2.gov.bc.ca (PDF) · verified 2026-09-10 · coquitlam.ca · verified 2026-09-10
The documents the statements above were read from, with the date each was last checked.
The rules change at every city line. These pages are built from the same bylaw reads.
This page describes Coquitlam's rules as they read on 2026-08-02. Bylaws change. Nothing here is a permit determination or legal advice, and only the municipality can approve a build.