Short answer: Prefab home cost in Ontario is set by the lot as much as the factory: size and finish level, transport distance, foundation, servicing, crane access and permits. The Government of Ontario notes that the further your lot is from the factory, the higher the cost. As an illustration only, a typical one-bed turnkey garden suite is illustrated around $310,000 including permits; that is not a quote for your property.
Key takeaways
| Question | Short answer | Source |
|---|---|---|
| Fixed Ontario price? | No. Lot, size, finishes, transport and site work drive it | Ontario — Building a modular house |
| Transport | Greater distance from factory = greater cost | Ontario — Building a modular house |
| Permits | Municipal building permit required; Building Code applies | O. Reg. 163/24 (Building Code) |
| Factory standard | CSA A277 certification for factory-built buildings | CSA A277 |
| Illustrative figure | One-bed turnkey garden suite illustrated around $310,000 incl. permits (not a quote) | Feasibility |
What drives prefab cost in Ontario
- Size and design — floor area, storeys, layout and finish level.
- Factory completion — how much is finished before delivery versus on site.
- Transport and crane — distance from the factory and access to your lot.
- Foundation and servicing — footings, water, sewer, electrical and grading.
- Permits and fees — municipal building permit, plus any development charges; Toronto offers a DC deferral program for eligible garden and laneway suites.
What to ask in a prefab quote
Ask what is included: foundation, transport, crane, utility hook-ups, permit fees, site grading and finishing. Ontario notes that some companies are full service while others leave site work to a general contractor. Compare build methods in modular vs site-built garden suites, see prefab homes in Ontario, or browse the guides hub. To get a real number, start with the feasibility check.
FAQs
Sources
- Government of Ontario — Building a modular house
- Ontario Building Code, O. Reg. 163/24
- CSA A277 — Procedure for factory certification of buildings
- City of Toronto — Laneway and Garden Suite DC Deferral Program
Disclaimer: Figures cited are market estimates provided for information only and are not a quote. Municipal rules, fees, and programs change — always verify current requirements with your local authority. Modular X provides exact pricing only after a site-specific feasibility review.