Home/Modular Homes by City/Hamilton
Serving Hamilton & the surrounding area
Modular Homes & Garden Suites in Hamilton, Ontario
Factory-direct modular homes and backyard suites for Hamilton. Here's what Hamilton's additional-dwelling-unit by-law allows in your backyard, what it costs, and the rules that apply — plus one of Ontario's most generous ADU grants.
What you can build in Hamilton
Full modular homes — from $175,696. 29 models from 560 to 1,405 sq ft, 1–3 bedrooms — factory-built to the Ontario Building Code and set on a permanent foundation (a real, permanent house, not a “trailer”).
Backyard suites (ADUs) — from $96,244. 7 compact models built for garden-suite and in-law-suite use, sized to fit what Hamilton's by-law allows.
All homes are CSA-certified (A277 modular / Z240MH manufactured), finished in the factory, and delivered ready for foundation and hook-up. What's the difference between modular, manufactured, and mobile? →
Find your backyard suite — 3 quick questions
We'll narrow the models that fit a typical Hamilton backyard allowance to the ones that fit your life. No email needed.
1 · Who's it for?
2 · What layout?
3 · What size feels right? (Hamilton lots typically allow up to ~750 sq ft)
Hamilton needs a deep yard — a detached suite must sit 7.5 m (≈25 ft) from the main house. Your exact lot may allow more or less — get the real number for your address in seconds.
Check your exact Hamilton address →Can you put a garden suite (ADU) in your Hamilton backyard?
Often, yes — Hamilton permits a detached Additional Residential Unit on most serviced residential lots. The specifics, from City of Hamilton Zoning By-law No. 05-200, as amended (Bill 23 ADU provisions):
| Max size | 75 m² (≈807 sq ft); accessory buildings capped at 25% lot coverage |
|---|---|
| Max height | 6.0 m (≈20 ft) |
| Setbacks | 1.2 m (≈4 ft) rear and side; a large 7.5 m (≈25 ft) separation from the main house — the deepest in the GTA |
| Bedrooms | Maximum 2 bedrooms; no rooftop patios or balconies |
| Parking | None required |
| Servicing | Municipal water & sewer required |
| Conservation | Hamilton Conservation Authority (HCA) |
Getting your building permit in Hamilton
An eligible lot still needs a building permit before anything is delivered. Here's how Hamilton's process actually works — verified against the Hamilton building department's own pages.
How do you apply for an ADU building permit in Hamilton?
Through email + secure file transfer to the Building Division (the City's ePLANS online portal has been offline since a 2024 cybersecurity incident). Email the Building Division (building@hamilton.ca) with the property address and permit type in the subject line; staff send back a secure file-transfer link to upload the full package. In-person submission at City Hall (71 Main St W, 3rd floor) also works. Confirm the current channel with the Building Division (905-546-2720) before applying — the process may change as systems are rebuilt. Hamilton's building-permit page ↗
- Confirm zoning permits a detached ADU on the lot, and check whether the property sits in a Hamilton Conservation Authority regulated area (stream, ravine, wetland, steep slope, harbour/lake)
- Apply for a Municipal Address Number for the detached unit — a separate application and fee required under the Municipal Addressing By-law
- Prepare the package per the City's Additional Dwelling Unit Checklist — for ADU permit types, all drawings must be combined into ONE PDF
- Email the Building Division with the address and permit type, then upload the package via the secure link staff send back
- Staff check completeness within about 2 business days — deficiencies come back as a review letter with a resubmission link
- Pay the permit fee once the application is confirmed complete (staff collect payment by phone)
- The Building Division completes plan review and issues the permit (or a written refusal with reasons)
What does a Hamilton ADU permit application need?
- Completed building-permit application form
- Site plan showing the detached unit's location, setbacks, and separation from the main house
- Construction drawings combined into a single PDF, by a BCIN designer, architect, or engineer
- The City's Additional Dwelling Unit Checklist items
- Municipal Address Number application/confirmation for the new unit
- Hamilton Conservation Authority permit or clearance where the lot is in a regulated area
How much does an ADU building permit cost in Hamilton?
Hamilton calculates the permit fee by formula (a Service Index rate × floor area in m²) rather than a flat rate, with a $291 minimum — get a current estimate from the Building Division; budget the separate $455 Municipal Address Number fee for the new detached unit as well.
| Permit fee | Service Index rate × floor area (m²) per Building Permit By-law 15-058 — confirm the current rate with the Building Division |
|---|---|
| Minimum fee | $291 for any permit |
| Municipal Address Number | $455 — required for a new detached ADU under the Municipal Addressing By-law |
Ontario exempts most additional dwelling units from development charges province-wide; Hamilton determines parkland-dedication and charge-related items case-by-case during plan review — confirm with the Building Division.
How long does an ADU building permit take in Hamilton?
Ontario's Building Code requires a decision on a complete house-class application within 10 business days. The clock starts only once the file is complete, after the Building Division's ~2-business-day completeness check — and with the manual email workflow in place, plan for the process to take longer than the legislated minimum.
Registration: No dedicated ADU registration by-law — the requirement is the Municipal Address Number ($455) for the new detached unit. Hamilton's ADU & Multi-Plex Housing Incentive (70% of eligible costs up to $40,000/unit) is a separate, optional program.
Worth knowing before you apply
- Hamilton's online permitting portal (ePLANS/ProjectDOX) has been down since a February 2024 cybersecurity incident — submissions run by email + secure file transfer, so there's no self-serve status tracking; call the Building Division for current status
- The Municipal Address Number is a separate application, fee, and process that's easy to miss — it's required before or alongside the permit application
- ADU drawings must be combined into a single PDF — split files bounce the submission
- Lots backing onto a stream, ravine, wetland, or the escarpment may need a separate Hamilton Conservation Authority permit on top of the building permit
- For the $40,000 ADU incentive, eligible costs are generally those incurred AFTER permit issuance — confirm current program terms with the Housing Secretariat before budgeting around it
Fees and timelines are estimates from Hamilton's published schedules, verified July 4, 2026. Rates and processes change — always confirm current requirements with the building department before you apply.
Grants & financing in Hamilton
ADU & Multi-Plex Housing Incentive — City of Hamilton direct grant — 70% of eligible costs, up to $40,000 per unit (permits issued on/after Oct 9, 2025). Confirm current intake.
See every program → Ontario ADU Grants Directory
A modular or prefab home on a permanent foundation is financed like any house. CMHC Prefab Plus allows an insured mortgage with as little as 5% down on the first $500,000, with construction funds released in stages. How modular home financing works →
Thinking of the suite as a rental? Run the numbers →
Hamilton modular homes — FAQ
Can you put a backyard suite in Hamilton?
Yes — on most serviced residential lots, with a building permit. Hamilton requires a deep yard: a detached suite must sit 7.5 m (≈25 ft) from the main house.
How big can a backyard suite be in Hamilton?
Up to 75 m² (≈807 sq ft) with a maximum of two bedrooms, and accessory buildings are capped at 25% lot coverage. Check your address for the specifics.
Are there grants for a backyard suite in Hamilton?
Yes — Hamilton’s ADU & Multi-Plex Housing Incentive provides a direct grant of up to $40,000 per unit (70% of eligible costs) for permits issued on or after October 9, 2025. Confirm current intake with the City.
How much does a modular home or backyard suite cost in Hamilton?
Modular home models start at $175,696 and run to about $338,000 for the largest layouts; backyard ADU models start at $96,244. Site work, foundation, delivery, and permits are additional.
Can I get a mortgage on a modular home in Hamilton?
Yes — on a permanent foundation it is financed as real property, including via CMHC Prefab Plus (5% down on the first $500,000).
Local rules summarized from City of Hamilton Zoning By-law No. 05-200, as amended (Bill 23 ADU provisions); verified by Modular Homes 400 and reviewed by James Clarke, REALTOR®. Always confirm current requirements with the City of Hamilton before you build.