Laneway Houses and Garden Suites in Canada (2026): Costs, Rules and Rental Income
Updated
A laneway house or garden suite is a second, detached home built on the lot of an existing house. Homeowners build them for rental income, for family (aging parents or adult children), or as a workspace. This guide covers what they are, how city rules work, what one costs to build, permits and timelines, financing, rental income and tax. Build costs run from roughly $150,000 to over $600,000 depending on the city and the design, construction takes about 6 to 12 months, and permitting often adds several months before that. It is part of our guide to property types in Canada.
Every city that allows laneway houses or garden suites sets its own limits on size, height, setbacks, parking and servicing, usually in its zoning by-law, and the limits often depend on the lot. Several cities have rewritten these rules in recent years, so the city’s own planning page is the place to confirm the current version before designing.
City
What the city calls them
What to check
Vancouver
Laneway houses
Laneway access, floor area and height limits for the lot
Toronto
Laneway suites and garden suites
Laneway suites need a lot on a public lane; garden suites sit in the rear yard
Calgary
Backyard suites
Location at the rear of the lot; whether a secondary suite can also be added
Edmonton
Garden and garage suites
Floor area limits and how the suite sits relative to the garage
Ottawa
Coach houses
Floor area limit, rear-yard coverage and servicing
Victoria, Hamilton
Garden suites
Lot size and servicing
Montreal
Varies by borough
Each borough’s own zoning by-law
In British Columbia, the province’s small-scale multi-unit housing rules say “secondary suites and/or accessory dwelling units are allowed province-wide in single-family residential zones”, and local bylaws have had to be updated to match.
Costs to Build
The figures below are rough ranges for a secondary dwelling. Per-square-foot costs for a full house by province are covered in how much it costs to build a house.
Separate loan released in stages, later converted to a mortgage
Personal savings
No interest cost
At a federally regulated lender, two limits apply: the revolving part of a HELOC can't exceed 65% of the home's value, and everything borrowed against the home (the mortgage plus the HELOC, or a refinanced mortgage) can't exceed 80% of its value. HELOC room is therefore the lower of 80% of the value minus the mortgage and 65% of the value. Mortgage insurance can't take a refinance above 80%, except a refinance to build secondary suites that takes no equity out.
HELOC for Laneway House
Example
Home value
$1,200,000
Mortgage owing
$500,000
Equity
$700,000
Total borrowing at 80% of value
$960,000
Room for a HELOC (80% of value minus the mortgage)
$460,000
Laneway cost
$350,000
Covered by the HELOC room?
Yes
After Construction
Option
Benefit
Refinance
Lower rate than HELOC
Appraisal
Property value increased
Lower LTV
Better terms possible
Permit Process
Typical Steps
Step
Timeline
1. Research zoning
1-2 weeks
2. Hire designer/architect
2-4 weeks
3. Design development
4-8 weeks
4. Submit for permit
1 day
5. City review
8-16 weeks
6. Revisions
2-6 weeks
7. Permit issued
8. Construction
6-12 months
9. Inspections
Throughout
10. Occupancy permit
2-4 weeks
Total Timeline
Phase
Duration
Before construction
4-8 months
Construction
6-12 months
Total
10-20 months
Rental Income Potential
Rental income is what decides whether a laneway house pays for itself. The ranges below are rough estimates; actual rents depend on the neighbourhood, size and finish. Against that income, the financing cost matters:
on a $400,000 build financed entirely with a HELOC at an illustrative 7%, interest-only payments are about $28,000 a year, more than the roughly $20,000 net rent in the Vancouver example below, so the suite would run at a loss until part of the cost is paid down.
Rent from a laneway house is taxable rental income (see how rental income is taxed), and when the property is sold, the part used to earn rent may not be covered by the principal residence exemption. The tables below are a summary only.
Rental Income
Report
Rental income
All rent received
Deductions
Proportional expenses
Depreciation
CCA optional
Capital Gains
On Sale
Main house
Principal residence exemption possible
Laneway portion
Likely taxable
Allocation
Based on value/use
GST on New Construction
Self-Supply Rule
If rent out
GST may apply on fair value
Can claim ITCs
On construction costs
Complex
Rules depend on the facts; a tax professional can confirm
A laneway house is a large upfront cost ($150,000 to $600,000 or more) with a long permitting process. In return it can bring rental income, add to the property’s value and give the household flexible space. Whether it pays depends on the city’s rules for the lot, the build cost, how it is financed and the rent it can earn.