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Serving the Town of Fort Frances (Rainy River District)
Modular Homes & Garden Suites in Fort Frances, Ontario
Factory-direct modular homes and backyard suites for the Town of Fort Frances — the border town on the Rainy River, across from International Falls. Fort Frances adopted a brand-new comprehensive Zoning By-law (93-25, December 2025) that writes additional residential units in for the first time: up to two extra units per home as-of-right, including a detached backyard suite of up to 40% of your home's floor area, in the R1 and R2 zones in town and the rural RD zone. Here's what the by-law allows, what it costs, and the rules that apply.
What you can build in Fort Frances
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 Fort Frances'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 Fort Frances 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? (Fort Frances lots typically allow up to ~646 sq ft)
Fort Frances caps a detached suite at 40% of your home's gross floor area — the house sets the ceiling, not a fixed number. 40% of a typical 150 m² (≈1,615 sq ft) house is 60 m² (≈646 sq ft). The 15% cap on all accessory buildings combined can bind first on a small lot with an existing garage. Enter your address for the specifics. Your exact lot may allow more or less — get the real number for your address in seconds.
Check your exact Fort Frances address →Can you put a garden suite (ADU) in your Fort Frances backyard?
Often, yes — Fort Frances permits a detached Additional Residential Unit on most serviced residential lots. The specifics, from Town of Fort Frances Zoning By-law 93-25, §3.2 — Additional Residential Units (adopted December 8, 2025):
| Max size | Up to 40% of your main home's gross floor area (§3.2.1 e) — so a 150 m² (≈1,615 sq ft) house allows a suite of about 60 m² (≈646 sq ft), and a larger home allows more. Up to two additional units per lot (maximum three dwellings), but only one may be in a detached backyard building (§3.2.1 a). |
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| Where it goes | Permitted where the house is: the R1 and R2 residential zones in town and the rural Resource Development (RD) zone, riding on a single-detached, semi-detached or townhouse home. Not in the front yard and no closer to the street than the house; at least 3.0 m (≈10 ft) from the rear lot line, 1.5 m (≈5 ft) from side lot lines, and 2.0 m (≈6.5 ft) from the house (§3.1, §3.2.1 f). |
| Height — two storeys allowed | Accessory buildings are normally capped at 6.0 m (≈20 ft) and one storey, but the by-law makes an express exception for an additional residential unit: it may occupy two storeys of a backyard building — a suite above a garage is legal by design (§3.1 h). |
| Coverage | Two caps stack: all accessory buildings together (garage, shed, suite) may cover at most 15% of the lot, and everything on the lot counts toward the zone's 40% overall coverage cap (§3.1 g, §3.2.1 g). |
| Parking & access | One space for the unit (Table 4-1) — shared with the home's existing parking area, and no new driveway may be established (§3.2.1 l). No new doorway on the front wall of the house; the suite gets its own municipal civic address (§3.2.1 d, h). |
| Servicing | In-town lots are on municipal water and sewer, and the unit is only permitted where adequate services are available, determined in consultation with the Town (§3.2.1 d). On rural RD-zone lots or where mains don't reach, private well and septic approved by the Town and/or the Northwestern Health Unit may be permitted (§3.3). |
| Water & floodplain | No additional unit is permitted in a regulated floodplain — even where the existing house is already there (§3.2.1 b). The town fronts the Rainy River and Rainy Lake, and new buildings near any watercourse need a 30 m (≈98 ft) setback from the high-water mark (§3.27.1). No conservation authority operates in the Rainy River District — the Town itself is the approvals desk. |
Check your specific Fort Frances address →
Garden suite, laneway suite, in-law suite, ARU, ADU — different names for the same thing: a small, self-contained home in the backyard. New to the idea? Start with what a garden suite costs in Fort Frances, and the models that fit →
Fort Frances's by-law is verified in our checker, so you can check if a garden suite is allowed at your Fort Frances address in about a minute.
Getting your building permit in Fort Frances
An eligible lot still needs a building permit before anything is delivered. Here's how Fort Frances's process actually works — verified against the Fort Frances building department's own pages.
How do you apply for an ADU building permit in Fort Frances?
Through In person or by mail — no online portal. Fort Frances has no e-permitting portal: applications are completed in person at the Chief Building Official's office by appointment, or submitted by mail. The Chief Building Official is John Burrows (jburrows@fortfrances.ca, 807-274-5323 ext. 1216) — one desk for the whole process. Payment by cash, certified cheque payable to the Town of Fort Frances, or Interac. Fort Frances's building-permit page ↗
- Confirm zoning first — under the Town's new Zoning By-law 93-25 (adopted December 8, 2025) a detached additional residential unit is as-of-right on a lot with a single-detached, semi-detached or townhouse home in the R1, R2 and rural RD zones, capped at 40% of the main home's floor area. The zoning schedules are PDF maps (Schedules A-1/A-2), so confirm your zone with the Town — a zoning variance, if you need one, runs 45 to 120 days.
- Confirm servicing with the Town — the unit is only permitted where adequate water and sanitary services are available, as determined in consultation with the Town (§3.2.1 d). In-town lots connect to municipal water and sewer; on rural RD lots, private services need Town and/or Northwestern Health Unit approval.
- Design within the envelope: 40% of the house's floor area, 3.0 m rear yard, 1.5 m side setbacks, 2.0 m from the house, 15% total accessory-building coverage — and remember the by-law expressly allows the unit to occupy two storeys of a backyard building (a suite over a garage).
- Prepare two full sets of building plans (floor plans, elevations, cross-sections and details) and two sets of the survey/site plan showing existing and proposed buildings. Larger projects may also need lot grading plans and designer information schedules (BCIN).
- Book an appointment with the Chief Building Official to complete the application in person (or submit by mail). The permit fee is set from the fee schedule at issuance.
- Once the permit issues, build with inspections at each stage — footing, foundation, roughed-in plumbing, framing, insulation and final. Request each inspection at least one business day in advance.
What does a Fort Frances ADU permit application need?
- Building Permit Application (completed in person by appointment, or by mail)
- Two full sets of building plans — floor plans, elevations, cross-sections and details
- Two sets of the survey/site plan showing property lines, existing buildings and the proposed unit
- Lot grading plan, Schedule 1 Designer Information (BCIN) and letters of undertaking where the project scale requires them
- Septic approval (Town / Northwestern Health Unit) on a rural privately-serviced RD lot
How much does an ADU building permit cost in Fort Frances?
Fees follow the Town's 2026 User Fees By-law 90-25 (effective January 1, 2026): new residential construction is $1.00/sq ft for the main floor ($0.75/sq ft basement, $0.45/sq ft each additional floor), $65 minimum — so a 646 sq ft single-storey unit prices at about $646, plus plumbing at $13 per fixture. All figures are estimates — confirm with the Chief Building Official (807-274-5323 ext. 1216).
| Building permit — new detached unit | $1.00/sq ft main floor + $0.75/sq ft basement + $0.45/sq ft each additional floor, $65 minimum (2026 User Fees By-law 90-25, Schedule C §3.1.4 — priced as new residential construction) |
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| Plumbing inspection | $13.00 per fixture (By-law 90-25, Schedule C §3.3) |
| Sewer & water connection | A new service connection is billed at actual cost plus 10% plus road restoration (By-law 90-25, Schedule F §4.3); replacing an existing sanitary building sewer is a flat $65 |
| Moving permit — modular delivery | $113 single-trip moving permit for an oversize move on Town streets (By-law 90-25, Schedule C §3.6) — your dealer or carrier typically arranges this |
| Starting without a permit | Construction commenced before issuance is charged the greater of $300 or 10% of the permit fee on top (By-law 90-25, Schedule C §3.4.1) |
Fort Frances publishes no development-charges by-law, and Ontario's Development Charges Act (s.2(3)) exempts qualifying additional residential units regardless — the user-fee schedule above is the whole municipal bill. Confirm current treatment with the Chief Building Official when you apply.
How long does an ADU building permit take in Fort Frances?
Ontario's Building Code requires a decision on a complete house-class application within 10 business days. The Town publishes no turnaround figure for building permits (a zoning variance, if needed, runs 45–120 days — but an as-of-right unit doesn't need one). The office runs on appointments: book the application meeting with the Chief Building Official early, and sequence the servicing consultation (§3.2.1 d) before you finalize drawings.
Worth knowing before you apply
- The rules are brand-new: By-law 93-25 (December 2025) introduced the additional-residential-unit regime — contractors and older advice may still be working from the 2014 by-law, which had no ARU provisions at all.
- One desk, by appointment: there's no online portal, and applications are completed in person with the Chief Building Official or by mail — the appointment is the intake.
- An accessory building is normally only permitted once the main use is established on the property — on a vacant lot the principal dwelling comes first (one named exception: the R1-2 lot at 1137 Fourth Street East may have an accessory building without a primary use).
- Starting before the permit issues costs the greater of $300 or 10% of the permit fee on top of it.
- Structures under 10 m² (108 sq ft) don't need a permit — but a dwelling unit always does, whatever its size, and it must meet the Ontario Building Code and Fire Code.
Fees and timelines are estimates from Fort Frances's published schedules, verified August 30, 2026. Rates and processes change — always confirm current requirements with the building department before you apply.
Grants & financing in Fort Frances
Development charges — none apply — Fort Frances publishes no development-charges by-law, and Ontario's Development Charges Act (s.2(3)) exempts qualifying additional residential units in any case — the permit fees in the Town's user-fee by-law are the whole municipal bill. Confirm current treatment with the Chief Building Official when you apply.
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 →
Fort Frances modular homes — FAQ
Can you build a garden suite / ADU in Fort Frances?
Yes — and only very recently. The Town's new comprehensive Zoning By-law 93-25, adopted December 8, 2025, permits additional residential units as-of-right for the first time: up to two extra units on a lot with a single-detached, semi-detached or townhouse home (maximum three dwellings), including one detached backyard suite. Both 'additional residential unit' and 'garden suite' are named permitted uses in the R1 zone, with the R2 and rural RD zones also carrying the right.
How big can a backyard suite be in Fort Frances?
Up to 40% of your main home's gross floor area — the house sets the ceiling. A 150 m² (≈1,615 sq ft) house allows about 60 m² (≈646 sq ft); a 250 m² (≈2,690 sq ft) house allows 100 m² (≈1,076 sq ft). Watch the shared accessory cap too: all accessory buildings together may cover at most 15% of the lot, so an existing garage eats into the envelope. A basement unit inside the house may occupy the whole basement.
Can the suite go above a garage in Fort Frances?
Yes — expressly. Accessory buildings are normally limited to one storey and 6.0 m (≈20 ft), but By-law 93-25 makes a specific exception where an additional residential unit occupies the second storey of a backyard building: two storeys are permitted (§3.1 h). That makes a suite-over-garage one of the most space-efficient ways to use the 15% accessory-coverage cap.
Can you build an ADU on well and septic in Fort Frances?
In town, no — Fort Frances requires municipal water and sewer where they're available, and the additional unit is only permitted where adequate services exist, determined in consultation with the Town (§3.2.1 d). On rural Resource Development (RD) lots or where mains don't reach, private or communal services approved by the Town and/or the Northwestern Health Unit may be permitted (§3.3 a) — there's no conservation authority in the Rainy River District, so the Town and the health unit are the whole approvals picture.
Can you put a modular home in Fort Frances, Ontario?
Yes. On land you own, a CSA A277 modular home on a permanent foundation is legal residential housing under the Ontario Building Code throughout Fort Frances — as the principal dwelling in the R1, R2 or RD zones, or as the detached additional residential unit in your backyard under §3.2. Factory-built construction also travels well: the module arrives finished, which matters at the end of a long haul to the Rainy River District.
How much does a modular home or backyard suite cost in Fort Frances?
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 Fort Frances?
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 Fort Frances Zoning By-law 93-25, §3.2 — Additional Residential Units (adopted December 8, 2025); verified by Modular Homes 400 and reviewed by James Clarke, REALTOR®. Always confirm current requirements with the municipality before you build.