What Does a Backyard Home Really Cost in Ontario?
Real numbers: model pricing, servicing and site work, rental math, and current funding programs.
The question we hear more than any other: what does a backyard home actually cost? Here is an honest breakdown using real numbers from our Maple model, plus what makes the price move up or down.
The build
Our Maple model — 600 sq ft, 2 bedrooms, 1 bathroom — is priced at $189,999 + HST. That covers the complete unit: foundation, structure, insulation, mechanical and electrical, kitchen, bathroom, and finishes.
Servicing and site work
The build price is not the all-in price. Every lot needs servicing: water, sewer or septic connection, hydro, grading, and permits. Budget roughly $15,000 for this on a typical serviced urban lot. That puts the all-in cost at approximately $231,649.
What moves that number:
Distance to services. A long run to the sewer lateral or hydro connection adds trenching and cost
Site conditions. Poor soils, steep grading, or rock add foundation and earthwork cost.
Trees and access. Tree removal or tight access for equipment shows up in site work.
Finishes and upgrades. Standard finishes are included; upgrades are optional.
Permits and fees. Building permit fees vary by municipality.
Get a site-specific review before treating any number as a quote — the range between an easy lot and a difficult one is significant.
The rental math
Using an illustrative rent of $2,100/month ($25,200/year) against the $231,649 all-in cost:
Gross yield: ~10.9%
Simple payback: ~9.2 years
That is before expenses — property tax, insurance, maintenance, and vacancy all come out of the gross. It is also illustrative, not a promise: rents vary by neighbourhood, and a smaller or larger unit changes the math. But it shows why the investment case works: the capital cost is modest relative to the income for the square footage.
Funding programs
Two programs worth knowing about, both currently closed — see our Funding page and check for reopening:
London's Detached ARU Forgivable Loan: up to $45,000 per unit, forgiven over 10 years. Requires owner-occupancy, which rules out pure investor deals. Intake is closed for 2026 and reopens annually.
Hamilton's ADU incentive: covered 70% of eligible costs up to $40,000 per unit. The portal has reached funding capacity and is closed to new applications.
Programs open and close. We track them and will update this post as they change.
The bottom line
For a typical serviced lot in southwestern Ontario, plan on roughly $230,000 all-in for a complete 2-bedroom backyard home, with the final number set by your lot's servicing and site conditions.
Want numbers for your specific property? Book a free property review — we'll check your zoning, servicing, and fit before you spend anything.
Last updated: September 30, 2026. Prices and program details change; confirm current figures before making decisions.