Legalizing a Secondary Suite in the Lower Mainland: What to Know Before You Start
Got a basement suite that was built years ago without permits? Or thinking about turning part of your house into a rental? You're not alone. Legalizing a suite is a common goal for homeowners across the Lower Mainland. The good news: it's in many cases doable. The catch: it takes planning, paperwork and usually some upgrades. Here's a plain-language look at what municipalities across the Lower Mainland are looking for.
Requirements vary by municipality, so always confirm the details with yours.
What counts as a "legal" suite?
Generally, a suite is legal when it meets your municipality's zoning and the building code, has a building permit, and has passed final inspection. Vancouver puts it simply: a suite is "not considered legal until the final inspection has been passed."
A few things that don't make a suite legal:
Paying a suite utility fee. New Westminster says it outright: paying the suite utility charge "does not mean a suite is authorized."
Having had a tenant for years. Age alone doesn't count, though older units may be treated as legal if they met the rules when they were built.
Also worth knowing: where the BC Building Code applies, a suite can't be stratified or sold separately from the house. It can sit above, below or beside the main home, but not in an apartment building or where another, separate unit is above or below. Halves of side-by-side duplexes and row houses can qualify when separated by a fire wall. Rules for duplexes vary, so confirm with your municipality.
Since BC's small-scale housing changes (Bill 44), most single-family lots in BC municipalities must allow at least one extra unit (subject to exceptions), and many allow more. So a suite may now sit alongside a laneway home or be part of a multiplex. How many suites you can have still depends on your municipality's zoning.
The steps, from first look to final inspection
Here's the typical path to a legal suite. The first four steps are where most of the paperwork, and most of the mistakes, happen. That's the part Archivolt takes off your plate.
Confirm your zone allows a suite. We check your zoning and tell you up front whether a suite is allowed on your lot, before you spend anything on drawings.
We arrange a pre-inspection or pre-application meeting where the municipality offers one, including a historical review.
Prepare submittal drawings. Each municipality has its own submission drawing requirements, and we prepare drawings to meet them. We handle all municipal records and the title search, perform all site measurements and record observations, coordinate with engineers, and ensure updated, correct forms are completed.
Apply for the building permit and pay the fees. We prepare, file and track the application, and answer the municipality's questions as they come up.
Guide you or your General Contractor through the trade permits for electrical, plumbing and gas, from the municipality or Technical Safety BC depending on your municipality. This includes guidance through the Final Inspection phase.
Assist you to register or declare the suite for utility fees, and get a business licence where required.
How the rules differ by municipality
A few sourced examples of how much this varies:
Vancouver: one suite per primary dwelling. You need a business licence to rent long-term (not if family lives there), and an unapproved suite isn't eligible for a rental licence.
Burnaby: an existing unpermitted suite needs a building permit. Renting out a suite without registering it for Burnaby's suite utility charges can bring a $1,000 fine. A business licence is needed if you rent but don't live on the property.
Surrey: all suites must be registered. The municipality bills a $1,000 charge for each unregistered suite it finds, and there's currently an annual $893 per suite service fee. Registering a suite for fees doesn't by itself make it legal.
Richmond: the suite must be inside the main home, not in a detached building (Zoning Bylaw 8500, s.5.4.1). The municipality's suite bulletin also says the suite's entry door shouldn't face the main street.
Coquitlam: you need a plumbing permit, and owners can't do the suite plumbing themselves. Unauthorized suites face a higher utility surcharge.
City of North Vancouver: in one-unit residential zones, a suite is allowed only where the owner lives on the property (Zoning Bylaw 6700, s.507(11)). Properties in the new Ground Oriented Zone (adopted December 2025) have different rules, so check with the municipality.
New Westminster: one authorized suite per single detached house, and the municipality's suite page also lists a Tree Permit as a requirement.
West Vancouver: suites must be registered and licensed.
Not on this list? Ask your municipality directly, and ask whether development cost charges or a water/sewer service upgrade apply to your project.
Common problems inspectors flag
Bedroom egress: unless the suite is sprinklered, each bedroom needs a window or exterior door that opens from inside without keys or tools. A window must give at least 0.35 m² of clear opening, with no side under 380 mm. If it opens into a window well, you need 760 mm of clear space in front of it (BC Building Code 9.9.10.1).
Headroom: low basement ceilings are the classic sticking point. In Vancouver, if your house was built under a permit issued before June 22, 2004, existing headroom can be reduced to 1,950 mm over 80% of the suite and all exit routes, with at least 1,850 mm elsewhere and 2,000 mm in shared corridors and exits. Confirm with the municipality.
Smoke and CO alarms: interconnected smoke alarms as required by code, plus CO alarms where there's a fuel-burning appliance or attached garage.
Heating and ventilation: a shared forced-air system needs extra smoke-control measures; a separate system is often simpler.
Separation between units: since September 21, 2026, where the BC Building Code applies, it lets a suite be separated from the main home either with fire separations or with a smoke-tight barrier of at least 12.7 mm drywall, plus extra safety measures. The smoke-tight option is limited to suites no larger than 80 m² or 80% of the main unit, whichever is less. Vancouver uses its own building by-law, so this option may not apply there; check with the municipality. Which option fits depends on the whole house.
Sound separation between units.
And the cost of skipping permits? In Vancouver, if work starts without a permit, the owner pays double the permit fee, at least $500 and at most $20,000. That's a fee, not a fine. Confirm with the municipality. The municipality also says homeowners pay these costs themselves, even if a contractor said permits weren't needed. In Vancouver, buyers are also responsible for unpermitted work done by past owners, including suites.
If you're a contractor
Check permits before you quote. If the job touches a suite, find out if it's permitted. In Vancouver, the owner is responsible for penalties even if a contractor said no permit was needed. That's a conversation you want early.
Don't start before the permit is issued. Where a building permit is required, it must be issued before work begins.
Know the trade rules. Trade and gas permits come from the municipality or Technical Safety BC, depending on where you are (Vancouver issues its own gas permits). In Coquitlam, owners can't do the suite plumbing themselves.
Check what was approved. If the space looks altered from what the municipality approved (a converted garage, basement or storage area, moved walls, added rooms, a changed use), check the permit history and build permit research and drawings into your schedule and price.
For further information, see our guide for contractors: Found Illegal or Unpermitted Work on a Job Site? A Contractor's Guide for the Lower Mainland
FAQ
Does paying a suite utility fee make my suite legal? No. Legal means zoning, building code, permit and passed final inspection.
Can I legalize a suite that's already rented? Often, yes, through a building permit for the existing suite. Expect upgrades and inspections.
What if my suite was altered from what the municipality approved? It's common for spaces to change over the years, like a garage or storage area converted to living space, walls moved or rooms added. We check the permit history to see what was approved and prepare measured as-built drawings of what's there now, so the application deals with the difference. Confirm the requirements with your municipality.
Does every municipality have the same rules? No. Requirements vary by municipality; confirm with yours.
Let's talk about your suite
Legalizing a suite is a lot easier with a clear plan and good drawings. Archivolt is a permits and drafting company. We help homeowners and contractors across the Lower Mainland with suite legalization drawings and permit applications.
It starts with that first call or email: Call 604-442-4255 · Text/WhatsApp 604-649-2425 · Email info@archivolt.ca · Web archivolt.ca
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