Suites, Coach Houses and What Your Lot Can Legally Hold

Start with the count. The Township amended Zoning Bylaw 1987 No. 2500 on 18 November 2024 by Bylaw No. 6020, defining small-scale multi-unit housing development as "up to four (4) dwelling units, which may be attached or detached, located on a single lot." Four is the ceiling; the Township wrote no six-unit transit tier. Section 102 attaches conditions: inside the urban containment boundary, under 4,050 square metres, on both municipal sewer and water, no heritage designation, outside the Willowbrook Transit-Oriented Area, no driveway onto an arterial. Fail one and the Township's own page is explicit, one residential unit plus one secondary suite or one accessory dwelling unit. Four units if the lot clears every gate; two if it does not. Bill 25 moved the provincial deadline to 30 June 2026, and on 5 August 2026 the Township's page still called the 2024 amendments current.

The suite and the detached unit are one permission, spent two ways. Sections 401.2, 402.2, 410.2, 301.2 and 303.2, R-1A, R-1B through R-1E, R-2, SR-1 and SR-3, carry identical wording: one small-scale multi-unit housing development, or one single family dwelling plus one accessory dwelling unit where the house contains no secondary suite. The definitions are not interchangeable. A secondary suite is one "as defined by and in compliance with the British Columbia Building Code," capped at 120 square metres. An accessory dwelling unit is "a dwelling unit within an accessory building", the detached form, whatever the listing calls it. A coach house is narrower: one "located only within the second storey of a detached garage." Since Bylaw No. 6147, adopted 21 July 2025, suites are also permitted in semi-detached dwellings, manorhomes, townhouses and rowhouses, which the Township's own suite guide still denies.

Height and parking decide whether the detached unit is buildable. Section 401.6 sets three ceilings: infill within 6.0 metres of the rear lot line at 4.5 metres, except coach houses fronting a lane; all other dwelling units at 9.0 metres; and "accessory buildings and structures that are not dwelling units" at 3.75 metres. That last figure is the one owners quote at us, and it governs the shed, not the building containing a dwelling. In the suburban zones floor area binds instead, 135 square metres of non-agricultural accessory building in SR-1 and SR-2, 80 in SR-3, SR-3A and SR-3B. Parking under Bylaw No. 6020 is one space per unit, minimum two per lot, waived only inside the Willowbrook Transit-Oriented Area; a suite adds one more. The provincial ban on parking minimums attaches to a six-unit tier the Township never wrote.

Legal means a permit, a code, and an accepted final inspection. The Township requires a building permit for every secondary suite. The Building Code sets room height at 2.1 metres under Article 9.5.3.1, a bedroom egress window at 0.35 square metres with no dimension under 380 millimetres, and sound separation at STC 43. Fire separation is a trade rather than a number, 45 minutes with ordinary alarms, 30 with additional interconnected photoelectric alarms, 15 where every alarm in the house is photoelectric and interconnected, none in a sprinklered building. Langley Building Bylaw 2008 No. 4642 forbids occupancy "until an accepted final inspection has been undertaken by the Building Inspector and occupancy has been authorized by the Building Inspector in writing," penalty to $10,000, each day a separate offence. The suite then costs $448.93 a year under Utility Rate Bylaw No. 6107, being 30 per cent of the 2026 flat water and sewer rates. The Township requires no business licence to rent it; the City of Langley does.

An unauthorised suite is not a discount; it is a transferred liability. Insurers treat a suite as a change in how the home is used, and brokers and the Insurance Bureau of Canada describe non-disclosure as putting the whole policy at risk, not merely the suite. Lending is explicit: the federal mortgage insurance changes effective 15 January 2025 allow refinancing to add units to 90 per cent of as-improved value below $2 million over 30 years, but the Canada Gazette wording requires them to be "fully self-contained units" that "meet municipal zoning requirements." Question 3Q of Property Disclosure Statement form BC1002, revised July 2025, asks "Do the Premises contain unauthorized accommodation?", and in Sewell v. Abadian, 2025 BCCA 158, the Court of Appeal held that striking a question out is itself a representation of no knowledge. Removal is physical: second kitchen and laundry out, 220-volt wiring cut at the panel and at each outlet, plumbing capped inside the walls, locks off the connecting door, then an inspection.

Inside the Agricultural Land Reserve the Township's numbers do not govern. The Agricultural Land Commission Act caps a principal residence at 500 square metres. Section 34.3 of the ALR Use Regulation permits an additional residence without an ALC application only where the parcel held one residence when construction began, the two are detached, and the second is 90 square metres or less on parcels of 40 hectares or less, 186 above that. Section 31 allows a secondary suite only inside the principal residence, so any detached unit is an additional residence. Rural Zone RU-1 permits two single family dwellings per lot, which is not agreement: sections 46(4) and (5) make a bylaw allowing what the Act does not of no force or effect, and the Commission said so expressly of the small-scale legislation in July 2024.

Verify it in the file, not in the remarks. The Township runs a Building Records Search, $30 non-refundable, a stated goal of seven business days, requested by the owner or an authorised applicant. It returns the permits, drawings, site plan, septic field location, and the item that settles the question: the date of the accepted final inspection. A permit issued and never finalled is not a legal suite. Ask for that date, the permit number and the drawing set, and read them against what is physically in the basement or over the garage. The Township issued permits for 81 new secondary suites between January and 31 July 2026, against 135 in the same period of 2025. We condition on the file, before subjects come off.

Sourced from Township of Langley Zoning Bylaw 1987 No. 2500 sections 102, 301 to 305, 401, 402 and 410 as amended by Bylaws No. 6020 and No. 6147, the Township's small-scale multi-unit housing, secondary suites, building records, utility rates and business licence pages, its Guide to Secondary Suites and Secondary Suite Removal Requirements, Langley Building Bylaw 2008 No. 4642, Bylaw Notice Enforcement Bylaw 2008 No. 4703 and Utility Rate Bylaw No. 6107, the City of Langley Zoning Bylaw, 2025, No. 3300 and its business licence schedule, the Province's small-scale multi-unit housing page and Bill 25 policy bulletin of 28 November 2025, British Columbia Building Code guidance published by the Fraser Valley Regional District, the Regional District of Central Okanagan and the City of Nanaimo, the Agricultural Land Commission's Information Bulletin 05 and its July 2024 housing note, Canada Gazette Part II SOR/2025-55 and the Department of Finance release of October 2024, BCREA's Legally Speaking of 3 October 2025 and Property Disclosure Statement form BC1002, and Aldergrove Star permit reporting of 11 August 2026, all verified 25 August 2026. This report describes and informs; it is not legal, building code or financial advice, and a specific parcel, its zoning and its permit history deserve specific verification. Do you want to know whether your lot can take a detached unit, and whether the suite already in it was ever finalled?