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Your basement apartment has a building permit and passed inspection. This is the kind of rule Almost Passive flags before it becomes a problem.
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Your basement apartment passed inspection. You have the building permit. You think you're ready to rent.
Then the City of London stops you: the unit isn't registered.
This catches landlords off guard because building permits and second unit registration are two separate municipal processes. Many landlords assume the permit covers everything. It doesn't. Without registration, your rental unit licence can't be issued, your insurance may deny claims, and you're operating outside the law.
This guide walks you through London's second unit registration requirement step by step — what it is, who needs it, how to apply, and what happens if you skip it.
What Is London's Second Unit Registration Program?
The City of London's second unit registration program is a formal municipal process that records the legal existence of a second residential dwelling on a property.
Under London's Zoning By-law (ZBL-1) and its Official Plan — updated to comply with provincial legislation (Bill 23, the More Homes Built Faster Act) — most residential properties can now have one second dwelling unit as of right. That means a basement apartment, above-garage suite, coach house, or garden suite is legally permitted.
But "permitted" doesn't mean "automatically rentable." The city must:
- Assign the unit its own municipal address (e.g., "45 Main Street, Unit B")
- Confirm it meets Ontario Building Code and fire safety minimums
- Link it to the Rental Housing Licensing system so you can secure your rental licence
That's registration.
Who Must Register a Second Unit in London?
You must register if you own a self-contained residential unit inside or attached to your primary home that you rent — or plan to rent — to a tenant.
This includes:
- Basement apartments — finished basement with separate kitchen, bathroom, and exterior entrance
- Above-garage suites — self-contained living unit built over a detached or attached garage
- Garden suites / coach houses — separate small dwelling on the same lot as the primary residence
- Side-door suites — portion of a house converted to separate dwelling with independent entrance
Important: Age doesn't exempt you. If your basement apartment was built 10 years ago and you're renting it, it still needs to be registered under current rules. The requirement applies to existing units already in use, not just new builds.
Registration vs. Permit vs. Rental Licence — What's the Difference?
Three separate municipal processes govern second units in London. Confusing them is the #1 landlord mistake.
| Process | Purpose | Issued By | Timing |
|---|---|---|---|
| Building Permit | Approves construction or conversion of the dwelling unit | City of London Building Division | Before construction begins |
| Second Unit Registration | Creates official city record; assigns municipal address; confirms code compliance | City of London Planning & Development | After construction completed; before rental |
| Rental Unit Licence | Annual operating licence to rent a residential unit | City of London Municipal Compliance | After registration confirmed |
You need all three. Registration must come before your rental licence application.
For basement apartments built before the registration requirement existed, you may need a retroactive building permit as well. Check with the Building Division.
6 Steps to Register a Second Unit in London
Step 1: Confirm Your Zoning Allows a Second Unit
Most R1 through R6 zones in London now permit one second unit under ZBL-1. Some zones have restrictions based on lot size or density.
Check your property's zoning using the City of London's interactive mapping tool at london.ca. Search your address and confirm the zoning designation.
If your property is not in a permitted zone, you'll need a formal zoning amendment — a longer, more expensive process. Don't skip this step.
Step 2: Verify Your Unit Meets Building Code Standards
Registration triggers a city inspection. Before you apply, ensure the unit meets these Ontario Building Code and fire code requirements:
Ceiling height:
- Minimum 1.95 metres (6'5") in all habitable rooms
- Bathrooms and hallways can be lower
Egress windows (sleeping rooms only):
- Minimum opening: 0.35 square metres
- No single dimension less than 380mm
- Must allow emergency escape without tools
Fire separation:
- Minimum 30-minute fire-rated assembly between units (typically drywall both sides)
- No shared walls without proper fire rating
Smoke and CO alarms:
- Interconnected smoke alarms in all bedrooms, hallways outside sleeping areas, and every storey
- Carbon monoxide alarms on each storey
Separate entrance:
- Independent exterior entrance that does not pass through primary dwelling
- Must be directly accessible from outside
Plumbing and utilities:
- Functioning kitchen and bathroom with separate hot and cold water supply
- Separate electrical panel (or clearly designated circuits)
If your unit was built and passed final inspection with permits, it likely meets these standards. If it was built without permits — common in older London properties — you may need retrofits or a retroactive permit inspection before registration can proceed.
Step 3: Request a Municipal Address
The second unit cannot be registered without its own civic address. Contact the City of London Addressing Department (part of Development Services):
Phone: Check london.ca for current contact What to provide: Your property address and confirmation that this is for a second unit registration
The city assigns a unit identifier (Unit A/B, "½", "lower", etc.) and issues formal address confirmation. This address goes on your lease, utility accounts, and rental licence application.
This step is quick — typically 1–2 weeks.
Step 4: Gather Documents and Submit Your Registration Application
Submit your application to the City of London Planning and Development department via the building permit portal or in person.
Required documents:
- Proof of property ownership (title or recent property tax assessment)
- The newly assigned municipal address
- Scaled floor plan showing:
- Room dimensions
- Kitchen and bathroom locations
- Egress window locations and sizes
- Fire separation walls
- Smoke and CO alarm locations
- Separate entrance location
- Building permit and final inspection records (if the unit was built with permits)
Application fee: Varies annually; check london.ca for current rates (typically $200–$500).
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Your basement apartment has a building permit and passed inspection. This is the kind of rule Almost Passive flags before it becomes a problem.
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Processing time: Initial review takes 1–2 weeks. The city then schedules an inspection.
Step 5: Pass the City Inspection
A city inspector will visit to verify:
- Unit meets minimum building code and fire code standards
- Egress windows are present and correctly sized in all sleeping rooms
- Smoke and CO alarms are installed and interconnected
- Fire separation meets minimum 30-minute rating
- Separate entrance is functional and independent
- Kitchen and bathroom are operational
Inspection typically takes 30–45 minutes. Bring:
- Your building permit paperwork (if applicable)
- Photos of egress windows, fire separation, and alarm installations
- Proof of separate electrical service (if applicable)
If the inspector identifies deficiencies, you'll receive a written list. Common issues:
- Egress window too small
- Smoke alarms not interconnected
- Fire separation incomplete or missing
- Entrance not properly independent
Fix these issues and request a re-inspection (usually 1–2 weeks later). Re-inspection fees apply.
Step 6: Registration Confirmed — Apply for Your Rental Unit Licence
Once registration is approved, the city updates its records and the unit appears in the municipal address database. You can then apply for your Rental Housing Licence.
Your rental licence cannot be issued without proof of registration. Once you have both, you're legally cleared to rent.
Timeline: How Long Does Registration Take?
Best case (unit built with permits, no deficiencies): 4–6 weeks
- Address assignment: 1–2 weeks
- Application processing: 1–2 weeks
- Inspection and approval: 2–4 weeks
More typical case (minor deficiencies requiring repair): 8–12 weeks
- Add 2–4 weeks for repairs
- Add 1–2 weeks for re-inspection
Worst case (unit built without permits, major code issues): 12–20+ weeks
- Retroactive permit process adds substantial time
- Multiple inspections and repairs
Plan ahead. Start registration 3–4 months before your intended tenant move-in. Don't wait until a tenant is signed and ready to occupy.
What the City Inspects — Checklist
Use this checklist before your inspection to avoid deficiencies:
- All sleeping rooms have egress windows ≥0.35 sq m
- Egress windows open freely without tools
- Fire separation wall(s) between units are complete on both sides
- Smoke alarms in all bedrooms, hallway outside sleeping area, all storeys
- CO alarm(s) on each storey
- All alarms are interconnected (wired or wireless)
- Separate entrance exists and is independent (doesn't pass through primary unit)
- Kitchen has functioning sink, hot and cold water
- Bathroom has functioning toilet, tub/shower, sink with hot and cold water
- Ceiling height ≥1.95m in all habitable rooms
- No shared utilities (separate electrical panel preferred)
If you're uncertain about any of these, hire a building inspector to pre-inspect before your city inspection. The $300–$500 cost is worth avoiding deficiency delays.
What Happens If You Don't Register?
Operating a second unit without registration creates legal, financial, and insurance problems:
Municipal bylaw violations The city won't issue your rental licence without registration. Operating without a licence violates the Municipal Code. Fines start at $500 and can reach $25,000 under the Municipal Act. Bylaw officers investigate when they receive complaints or during property standards inspections.
Insurance denial Most homeowner and rental insurance policies explicitly exclude rental income from unregistered, unpermitted units. A fire, liability claim, or damage claim in an unregistered unit can result in a denied claim — leaving you personally liable. Review your policy now; don't find out during a claim.
Rental Housing Licensing audit The city conducts periodic audits of registered rental units. If you don't have a licence for a unit you're renting, the audit flags it. You'll be ordered to register and licence retroactively, and fines apply.
LTB complications If you ever file an N4 notice, L1 application, or other Landlord and Tenant Board proceeding against your tenant, an unregistered unit status can weaken your position. Tenants raise it as a defence, and the LTB may refuse to hear your case on grounds of illegality.
Property standards enforcement If the city opens a property standards file on your property and discovers an unregistered second unit, they'll require immediate registration before closing the file. You'll also face potential orders for other deficiencies discovered during inspection.
Retroactive fines and back licence fees The city can assess retroactive rental licence fees covering years of unregistered rental activity, plus penalties.
Frequently Asked Questions
Q: Does a building permit automatically count as registration? A: No. The building permit approves construction. Registration is a separate municipal process through Planning and Development that creates an official city record and assigns an address. You need both.
Q: I built my basement apartment 15 years ago without getting a building permit. Can I still register it? A: Possibly. You'll likely need a retroactive building permit first. Contact the City of London Building Division to discuss options. Some older units can be inspected and grandfathered in; others require code upgrades. Start with the Building Division — don't go straight to registration.
Q: What if I can't afford the repairs the inspector identifies? A: You have options: complete the repairs yourself, hire a contractor, or pause the registration process until you can address the issues. The city will not issue registration without compliance. If repairs are extensive, get quotes from contractors before deciding to proceed.
Q: Can I register a second unit before I have a tenant lined up? A: Yes. Registration is separate from renting. You can register the unit, keep it empty, and rent it later. The licence comes after registration and is tied to when the unit is occupied.
Q: Will registering my second unit trigger a property tax reassessment? A: Possibly. MPAC (Municipal Property Assessment Corporation) reassesses properties on a four-year cycle. A registered second unit changes your property classification, which may affect your assessment. This is not a reason to avoid registration — but consult a property tax advisor if you're concerned about the timing.
Q: How much does the entire second unit registration process cost?
A: Budget $500–$1,500 total: application fee ($250–$500), address assignment (usually free), inspection ($0–$200), and potential re-inspection fees ($100–$200 if deficiencies are found). If you need a retroactive building permit, add $500–$2,000. If repairs are required, costs depend on the scope.
Second Unit Registration in London: Next Steps
Registering a second unit in London requires navigating three separate municipal processes in sequence: the building permit (already issued or retroactive), the second unit registration (Planning and Development), and the rental licence (Municipal Compliance).
The good news: it's straightforward if you plan ahead and ensure your unit is code-compliant before you apply.
The bad news: many London landlords skip registration or delay it, exposing themselves to fines, insurance denial, and LTB complications.
If you're adding a second unit to your London property or managing multiple rental units and want to ensure all registrations are current and correct, Prospera Properties handles municipal compliance, inspections, and licensing across London, St. Thomas, and Strathroy. Contact us to discuss your rental property compliance.
Social caption: London landlords: your basement apartment needs 3 separate registrations. Building permit. Municipal registration. Rental licence. Miss step 2 and you're fined $500+. Here's exactly what the city inspects and how long it takes. Full guide in bio.