Home/Modular Homes by City/Milton
Serving Milton & Halton Region
Modular Homes & Garden Suites in Milton, Ontario
Factory-direct modular homes and backyard suites for Milton and Halton Region. Here's what Milton's additional-dwelling-unit by-law allows in your backyard, what it costs, and the rules that apply.
What you can build in Milton
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 Milton'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 Milton 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? (Milton lots typically allow up to ~700 sq ft)
Milton caps a detached suite at the lesser of 10% of the lot or 110 m² (≈1,184 sq ft). Your exact lot may allow more or less — get the real number for your address in seconds.
Check your exact Milton address →Can you put a garden suite (ADU) in your Milton backyard?
Often, yes — Milton permits a detached Additional Residential Unit on most serviced residential lots. The specifics, from Town of Milton Comprehensive Zoning By-law 016-2014 §4.10 (Additional Dwelling Units):
| Max size | The lesser of 10% of the lot or 110 m² (≈1,184 sq ft). A suite over a detached garage can be larger — up to your home’s floor area, two storeys / 6 m. |
|---|---|
| Max height | 4.3 m (≈14 ft) for a garden suite (up to 6 m / ≈20 ft over a detached garage) |
| Setbacks | 1.5 m (≈5 ft) rear; 1.2 m (≈4 ft) side; 3.5 m (≈11 ft) separation from the main house |
| Units per lot | Up to 3 ADUs — at most one in a detached/accessory building |
| Parking | 1 space per ADU |
| Servicing | Municipal water & sewer required |
| Conservation | Conservation Halton; Niagara Escarpment Commission on Escarpment lands |
Getting your building permit in Milton
An eligible lot still needs a building permit before anything is delivered. Here's how Milton's process actually works — verified against the Milton building department's own pages.
How do you apply for an ADU building permit in Milton?
Through Town of Milton Citizen Portal (online building-permit application) (application portal ↗). Complete building permit applications are accepted digitally only, through the Citizen Portal — Milton's ADU Building Permit Application Guide (June 2025) states applications are 'accepted digitally only' at permits.milton.ca. Permit fees are payable by cash, cheque or debit at the time of application. Building Division: 905-878-7252 ext. 2397; Zoning: ext. 2329 / zoning@milton.ca. Milton's building-permit page ↗
- Confirm your lot qualifies under the zoning by-law: in Milton's urban area, up to three ARUs are permitted on a lot with a detached, semi-detached, semi-link or townhouse home connected to municipal water and sewer — but only ONE ARU may be in a detached accessory building (Zoning By-law 016-2014 §4.10). Check with the Zoning Division (905-878-7252 ext. 2329) before designing
- Prepare the application package: the provincial Application for a Permit to Construct or Demolish, a Schedule 1 Designer form (homeowner-designed or a BCIN-qualified designer, unless an architect/engineer stamps the drawings), and a full construction drawing set that follows Milton's Digital Submission Guidelines
- Submit everything digitally through the Citizen Portal at permits.milton.ca and pay the permit fee at application (cash, cheque or debit)
- Plans review: the Ontario Building Code sets a 10-business-day decision window for house-class permits; Milton advises applicants by email of status and of any additional information required, then issues an invoice once the application is accepted
- Build and call in the required inspections — typical ADU inspections include framing, insulation & air barrier, plumbing (underground, above-ground, final), heating rough-in and final, and final building — booked at 905-878-7252 ext. 2396 or via the online inspection request form
- Register the new ARU under By-law 032-2025: submit the ARU Registry application (online or at Town Hall), pay the one-time $340 registration fee, and pass a ~30-minute compliance visit by a municipal law enforcement officer and a fire prevention officer
- Renew the registration annually — the compliance certificate is valid one year; submit the renewal form 30 days before expiry (no renewal fee during the Town's three-year pilot)
What does a Milton ADU permit application need?
- Application for a Permit to Construct or Demolish (all sections completed, including the property's full legal description)
- Schedule 1 Designer form — required when the design is by the homeowner or a BCIN-qualified designer rather than an architect or professional engineer
- Site plan
- Existing floor layouts
- Proposed floor layouts including an egress plan
- Elevations showing the ADU entrance, egress/escape window locations, and any new or enlarged exterior openings
- Sections and wall/ceiling/fire-separation construction details
- All drawings to Milton's Digital Submission Guidelines: minimum 3/16"=1' scale, double-line walls showing thickness, existing vs proposed clearly differentiated, and the designer's name/BCIN/signature on every page
How much does an ADU building permit cost in Milton?
Expect roughly $1,400–$1,500 in building-permit fees for a typical ~600 sq ft (56 m²) detached ADU at the posted rate of $25.13/m² (minimum $264.20), plus the one-time $340 ARU registration fee — an estimate from the rates published on milton.ca; confirm the current year's rates when you apply.
| Building permit — secondary dwelling unit (detached) | $25.13 per m² of floor area, minimum $264.20 (posted milton.ca rate; includes drawing review and all required inspections) |
|---|---|
| ARU registration (By-law 032-2025) | $340 one-time at registration; annual renewal required, with no renewal fee during the Town's three-year pilot |
| Payment | Cash, cheque or debit at the time of application |
Milton's development-charge pamphlet (effective April 1, 2026) exempts the creation of up to three additional dwelling units in an existing single detached dwelling or prescribed ancillary structure (or one in any other existing residential building), provided the new unit(s) don't exceed the gross floor area of the existing dwelling and are permitted under the zoning by-law — so a code-compliant detached ADU behind an existing house pays no Town development charges.
How long does an ADU building permit take in Milton?
Ontario's Building Code requires a decision on a complete house-class application within 10 business days
Registration: Registration is mandatory under ARU Registration By-law 032-2025 (program launched April 1, 2025): $340 one-time fee, floor plans for all units filed with the application, and a ~30-minute joint compliance inspection by a municipal law enforcement officer and a fire prevention officer (smoke/CO alarms, fire separations, access routes, property standards). The compliance certificate is valid one year — renew 30 days before expiry (annual renewal is required by the by-law; no renewal fee during the three-year pilot). Non-compliance carries fines of $500–$50,000 plus administrative penalties of $600 per day.
Worth knowing before you apply
- Digital-only submission: Milton accepts complete building-permit applications only through the Citizen Portal, and drawings must conform to the Town's Digital Submission Guidelines (double-line walls, designer info on every page) or the application won't be accepted as complete
- Only ONE ARU per lot may be in a detached accessory building, and the as-of-right urban rules apply only on lots with municipal water and sewer service (Zoning By-law 016-2014 §4.10, urban area)
- Rural Milton runs a different framework (updated January 2026): in RV/C4 zones inside the Niagara Escarpment Plan area detached ARUs are not allowed at all (interior units only), and in A1/A2/RE Greenbelt zones an ARU is permitted only in an EXISTING accessory building located outside the Greenbelt Natural Heritage System — confirm your zone with the Town before designing a new detached build on a rural lot
- A purpose-built house-with-ADU requires separate HVAC systems so no air recirculates between units; where an existing furnace serves both units, a duct-type smoke detector that shuts off fuel and electrical supply to the heating system is required
- The building permit is not the last step — the ARU must also be registered under By-law 032-2025 ($340) and pass a municipal-law-enforcement + fire-prevention compliance visit, with annual renewals; operating an unregistered ARU exposes the owner to fines of $500–$50,000 and $600/day administrative penalties
Fees and timelines are estimates from Milton's published schedules, verified July 9, 2026. Rates and processes change — always confirm current requirements with the building department before you apply.
Grants & financing in Milton
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 →
Milton modular homes — FAQ
Can you put a garden suite in Milton?
Yes. Milton permits up to three additional dwelling units per lot (at most one in a detached building) on serviced urban lots — subject to size, height, and setback rules and a building permit.
How big can a garden suite be in Milton?
A detached suite is capped at the lesser of 10% of the lot or 110 m² (≈1,184 sq ft); a suite over a detached garage can be larger. Check your address for the specifics.
Can you put a modular home in Milton?
Yes. On land you own, a modular home on a permanent foundation is legal residential housing under the Ontario Building Code throughout Milton, subject to standard zoning and permits.
How much does a modular home or backyard suite cost in Milton?
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 Milton?
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 Town of Milton Comprehensive Zoning By-law 016-2014 §4.10 (Additional Dwelling Units); verified by Modular Homes 400 and reviewed by James Clarke, REALTOR®. Always confirm current requirements with the City of Milton before you build.