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Serving the Township of Otonabee-South Monaghan (Peterborough County)
Modular Homes in Otonabee-South Monaghan, Ontario
Factory-direct modular homes and backyard suites for the Township of Otonabee-South Monaghan — the rural Peterborough County township along Rice Lake and the Otonabee River, including Keene. The Township's 2024 Zoning By-law (§4.3) permits a secondary dwelling unit as-of-right — including a detached suite in your backyard — on rural, agricultural, hamlet, shoreline and estate-residential lots, on private well & septic. Here's what the by-law allows, what it costs, and the rules that apply.
What you can build in Otonabee-South Monaghan
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 Otonabee-South Monaghan'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 Otonabee-South Monaghan 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? (Otonabee-South Monaghan lots typically allow up to up to 70% of your home)
Otonabee-South Monaghan sizes a detached secondary suite at up to 70% of your home’s ground-floor area (no fixed m² cap), up to 9.0 m tall, within 50 m of your main house. As-of-right in the RU, A, RR, HR, SR and ER 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 Otonabee-South Monaghan address →Can you put a garden suite (ADU) in your Otonabee-South Monaghan backyard?
Often, yes — Otonabee-South Monaghan permits a detached Additional Residential Unit on most serviced residential lots. The specifics, from Township of Otonabee-South Monaghan Comprehensive Zoning By-law, §4.3 — Accessory and Secondary Dwelling Units (Office Consolidation 2024):
| Max size | A detached secondary suite may be up to 70% of your principal dwelling’s ground-floor area — there’s no fixed m² cap, so the bigger your home’s main floor, the bigger the suite (§4.3.2.f). |
|---|---|
| Where it goes | Inside the main dwelling or in a detached accessory structure. Up to two secondary units per lot — at most one inside the house and one detached (§4.3.1). As-of-right in the Rural (RU), Agricultural (A), Rural Residential (RR), Hamlet Residential (HR), Shoreline Residential (SR) and Estate Residential (ER) zones. |
| Height & setbacks | A detached suite’s accessory structure may be up to 9.0 m (≈30 ft) tall, but must meet your zone’s PRINCIPAL-building setbacks (not the smaller accessory-building setbacks) and sit within 50 m of your main house. In the RR and HR zones all accessory buildings share a 10% lot-coverage cap. |
| Parking | 1 parking space for the suite, accessed by your existing residential driveway (no new entrance); the lot must front an improved public road. |
| Servicing | Permitted on private well & septic where the Township confirms adequate water and sewage capacity (§4.3.2.a) — most of the Township is on private services. In the Agricultural/Rural zones, Minimum Distance Separation (MDS I) setbacks from livestock apply. |
| Conservation | Otonabee Region Conservation Authority (ORCA) — a secondary suite is not permitted in the regulated floodplain, so check ORCA mapping near Rice Lake, the Otonabee River, a wetland or a mapped hazard. |
Grants & financing in Otonabee-South Monaghan
Development-charge relief for additional units — Under the Development Charges Act (Bill 23), a qualifying secondary/additional residential unit ancillary to your home is generally exempt from municipal development charges — confirm the current treatment with the Township for your project.
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 →
Otonabee-South Monaghan modular homes — FAQ
Can you build a garden suite / ADU in Otonabee-South Monaghan (Keene)?
Yes — the Township’s 2024 Zoning By-law (§4.3) permits a secondary dwelling unit as-of-right, including a detached suite in an accessory structure, in the Rural, Agricultural, Rural Residential, Hamlet Residential, Shoreline Residential and Estate Residential zones. Up to two units per lot (one may be detached). A building permit is required and the unit must be registered with the Township.
How big can a backyard suite be in Otonabee-South Monaghan?
A detached secondary suite may be up to 70% of your principal dwelling’s ground-floor area — there’s no fixed maximum m² cap. The accessory structure can be up to 9.0 m (≈30 ft) tall and must sit within 50 m of your main house. Enter your address for the specifics.
Can you build an ADU on well and septic in Otonabee-South Monaghan?
Yes. The by-law permits a secondary dwelling unit where the Township is satisfied adequate water and sewage services are available (§4.3.2.a), so a private well+septic lot qualifies with a capacity confirmation. Most of the Township is on private services. A suite is not permitted in the regulated floodplain.
Can you put a modular home in Otonabee-South Monaghan, 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 the Township — as the principal dwelling or as a secondary dwelling unit. A mobile home or RV can’t be used as the secondary unit.
How much does a modular home or backyard suite cost in Otonabee-South Monaghan?
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 Otonabee-South Monaghan?
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 Township of Otonabee-South Monaghan Comprehensive Zoning By-law, §4.3 — Accessory and Secondary Dwelling Units (Office Consolidation 2024); verified by Modular Homes 400 and reviewed by James Clarke, REALTOR®. Always confirm current requirements with the City of Otonabee-South Monaghan before you build.