Home/Modular Homes by City/Gravenhurst
Serving the Town of Gravenhurst (District of Muskoka)
Modular Homes in Gravenhurst, Ontario
Factory-direct modular homes and backyard suites for the Town of Gravenhurst — the Muskoka gateway town at the south end of cottage country. Gravenhurst's Zoning By-law 2010-04 (§5.1) now permits an additional residential unit as-of-right — including a detached suite in your backyard — on both serviced town lots and rural (RR-5) or private-servicing lots. Here's what the by-law allows, what it costs, and the rules that apply.
What you can build in Gravenhurst
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 Gravenhurst'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 Gravenhurst 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? (Gravenhurst lots typically allow up to no fixed cap)
Gravenhurst sets no fixed floor-area cap — a detached suite is governed by the 6.0 m accessory-structure height, your main dwelling’s setbacks, and your zone’s lot coverage. As-of-right in the R-1/R-2/R-3/RM-1/RM-2, RC-4 and RR-5 zones — not in the Waterfront or Island residential zones. Enter your address to check your zone and servicing. Your exact lot may allow more or less — get the real number for your address in seconds.
Check your exact Gravenhurst address →Can you put a garden suite (ADU) in your Gravenhurst backyard?
Often, yes — Gravenhurst permits a detached Additional Residential Unit on most serviced residential lots. The specifics, from Town of Gravenhurst Comprehensive Zoning By-law 2010-04, §5.1 — Additional Residential Units (updated for Bill 23; consolidation July 2024):
| Max size | No fixed floor-area cap. A detached suite is governed by the 6.0 m (≈20 ft) height limit for a two-storey accessory structure containing the unit, plus your zone’s overall lot-coverage limit (roughly 30–60% for all buildings combined). |
|---|---|
| Units per lot | On full municipal water & sewer, up to three units (your house + two additional units, one of which may be detached). On a private well+septic lot or in the RC-4 / RR-5 zones, up to two units (house + one, which may be the detached suite). |
| Setbacks | Where an accessory building contains your suite, it must meet your zone’s PRINCIPAL-building setbacks (not the smaller accessory-building setbacks). Confirm the numbers for your zone. |
| Parking | 1 additional space per unit. |
| Servicing | Municipal water & sewer in the urban core, or private well & septic on rural and RR-5 lots — where you show the septic can handle the added unit (Ontario Building Code Part 8). |
| Where it’s allowed | As-of-right in the R-1, R-2, R-3, RM-1, RM-2, RC-4 and RR-5 zones. NOT in the Waterfront (RW) or Island (RI) residential zones, the Rural (RU) zone, or commercial/industrial zones — so most lakefront lots don’t qualify (the District bars ARUs on Waterfront-designated lands). |
Grants & financing in Gravenhurst
Muskoka Affordable Housing Initiatives Program (MAHIP) — The District of Muskoka offers a forgivable loan for an additional residential unit rented at an affordable rate (on the order of $40,000–$50,000 per unit, up to two units per property). Confirm current amounts and eligibility with the District of Muskoka.
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 →
Gravenhurst modular homes — FAQ
Can you build a garden suite / ADU in Gravenhurst?
Yes — Gravenhurst’s Zoning By-law 2010-04 (§5.1) permits an additional residential unit as-of-right, including a detached suite in an accessory structure. Up to three units are allowed on a fully-serviced lot (or two on private servicing / in the RC-4 and RR-5 zones), in the R-1/R-2/R-3/RM-1/RM-2, RC-4 and RR-5 zones. A building permit is required.
How big can a backyard suite be in Gravenhurst?
There’s no fixed maximum m² cap. A detached suite is governed by the 6.0 m (≈20 ft) height limit for a two-storey accessory structure containing the unit, your main dwelling’s setbacks, and your zone’s lot-coverage limit. Enter your address for the specifics.
Can you build an ADU on well and septic in Gravenhurst?
Yes. A detached suite is permitted on private well and septic (in the RR-5 zone or the unserviced/partially-serviced residential zones), provided you demonstrate the septic can handle the added unit under the Ontario Building Code (Part 8). Most of Gravenhurst outside the urban core is on private services.
Can you put a modular home in Gravenhurst, 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 Gravenhurst — as the principal dwelling or as an additional residential unit. A mobile home or RV can’t be used as the unit.
How much does a modular home or backyard suite cost in Gravenhurst?
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 Gravenhurst?
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 Gravenhurst Comprehensive Zoning By-law 2010-04, §5.1 — Additional Residential Units (updated for Bill 23; consolidation July 2024); verified by Modular Homes 400 and reviewed by James Clarke, REALTOR®. Always confirm current requirements with the City of Gravenhurst before you build.