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Serving Innisfil & Simcoe County
Modular Homes & Garden Suites in Innisfil, Ontario
Factory-direct modular homes and backyard suites for Innisfil and Simcoe County. Here's what Innisfil's additional-dwelling-unit rules allow in your backyard, what it costs, and the by-law that applies.
What you can build in Innisfil
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 Innisfil'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 Innisfil 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? (Innisfil lots typically allow up to ~538 sq ft)
Innisfil caps a detached suite at 50 m² (≈538 sq ft) — one of the smaller allowances, so a compact studio or one-bedroom fits best. Your exact lot may allow more or less — get the real number for your address in seconds.
Check your exact Innisfil address →Can you put a garden suite (ADU) in your Innisfil backyard?
Often, yes — Innisfil permits a detached Additional Residential Unit on most serviced residential lots. The specifics, from Town of Innisfil Zoning By-law 080-13 (as amended), per the Town’s ADU Homeowner’s Guide:
| Max size | 50 m² (≈538 sq ft) for a detached suite, within a 50% lot-coverage limit |
|---|---|
| Setbacks | 1.2 m (≈4 ft) rear & interior side |
| Parking | 1 space per ADU |
| Servicing | Municipal water & sewer (urban serviced lots); a detached suite can’t run on private septic |
| Conservation | Lake Simcoe Region Conservation Authority (LSRCA) near the lake, watercourses, or hazard lands |
Getting your building permit in Innisfil
An eligible lot still needs a building permit before anything is delivered. Here's how Innisfil's process actually works — verified against the Innisfil building department's own pages.
How do you apply for an ADU building permit in Innisfil?
Through Cloudpermit (application portal ↗). Innisfil runs all building permits through Cloudpermit — create an account, start a new application, and track review, payment, and inspections online. Innisfil's building-permit page ↗
- Create or log into your Cloudpermit account and select "Apply for a Permit"
- Create a project, enter the work location, and select the Accessory Dwelling Unit application type
- Upload the plans and forms, then pay the non-refundable application fee to submit for review
- Town staff review for Building Code and Zoning By-law compliance — respond to any deficiency notices raised in Cloudpermit
- Pay the remaining permit fees once invoiced, then download your permit placard and stamped plans
- Post the placard on site and book inspections online at each stage (2 business days' notice)
- Pass the final Notice of Completion inspection — the ADU is then automatically registered with the Town
What does a Innisfil ADU permit application need?
- Accessory Dwelling Unit application package (through Cloudpermit)
- Site plan showing the suite's location, setbacks, and parking
- Construction drawings (floor plans, elevations, cross-sections) + Schedule 1: Designer Information
- Owner's Authorization Form if an agent is submitting on the owner's behalf
- Septic assessment/upgrade documentation on well-and-septic lots (capacity for the added unit must be demonstrated)
- A conservation-authority permit (LSRCA or NVCA) BEFORE the building-permit application if the lot is in a regulated area
How much does an ADU building permit cost in Innisfil?
Expect roughly $1,300 for a typical ~600 sq ft detached ADU — $1.97 per sq ft of new floor area plus a $150.70 zoning permit and a $200.50 application fee that's deducted from the total (2026 rates, Fees By-law 057-24) — an estimate, not a quote; a new septic permit adds $903.90 where needed.
| Application fee | $200.50, non-refundable — deducted from the total permit cost (2026) |
|---|---|
| Permit fee | $1.97 per sq ft (≈$21.24/m²) of new floor area, incl. ADUs (2026) |
| Zoning permit | $150.70 (2026) |
| Septic permit (if a new/upgraded on-lot system is needed) | $903.90 (2026) |
The Town states no development charges apply to creating an accessory dwelling unit in Innisfil — and there is no registration or renewal fee.
How long does an ADU building permit take in Innisfil?
Ontario's Building Code requires a decision on a complete house-class application within 10 business days. The Town's own ADU guide cites 15 business days for a decision once an application is complete — turnaround depends heavily on how complete the submitted plans are.
Registration: No separate registration application or fee — after the final Notice of Completion inspection the ADU is automatically registered under the Town's ADU Registration By-law (one-time, no renewal).
Worth knowing before you apply
- ADUs are prohibited in the Cookstown settlement area (wastewater servicing constraints)
- ADUs are prohibited on lots with a private septic system within 100 m of the Lake Simcoe shoreline
- Shoreline properties run through Innisfil's Community Planning Permit System instead of the standard zoning process
- A conservation-authority permit (LSRCA/NVCA) must come BEFORE the building-permit application in regulated areas
- Well-and-septic lots must demonstrate septic capacity for the added unit before a permit will issue
- Electrical work needs a separate Electrical Safety Authority (ESA) permit outside the Cloudpermit process
Fees and timelines are estimates from Innisfil'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 Innisfil
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 →
Innisfil modular homes — FAQ
Can you put a garden suite in Innisfil?
Yes. Innisfil permits a detached additional dwelling unit on most serviced residential lots — subject to the size, setback, and parking rules and a building permit.
How big can a garden suite be in Innisfil?
A detached suite is capped at 50 m² (≈538 sq ft), within a 50% lot-coverage limit. Check your address for the specifics.
Can you put a modular home in Innisfil?
Yes. On land you own, a modular home on a permanent foundation is legal residential housing under the Ontario Building Code throughout Innisfil, subject to standard zoning and permits.
How much does a modular home or backyard suite cost in Innisfil?
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 Innisfil?
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 Innisfil Zoning By-law 080-13 (as amended), per the Town’s ADU Homeowner’s Guide; verified by Modular Homes 400 and reviewed by James Clarke, REALTOR®. Always confirm current requirements with the City of Innisfil before you build.