Rural Flamborough Runs on Hamilton's Second-Unit Rules, Not the Province's Three-Unit Rule

Why the province's three-unit rule stops at the services line

The Planning Act now lets owners build up to three units as-of-right — three in the main building, or two in the main building and one in an ancillary building — but only on land the province defines as being in a settlement area with full municipal water and sewage services. The province's own regulatory notice says the permission does not reach lands on partial or private servicing, and names rural areas as the example. Rural Flamborough is that example.

What applies instead is Hamilton's Zoning By-law 05-200, Section 4.33. In the Agriculture (A1), Rural (A2) and Settlement Residential (S1) zones — the farm parcels, the country lots and the hamlet lots — By-law 22-132 of June 2022 permits a maximum of one Additional Dwelling Unit within a single detached, semi-detached or street townhouse dwelling. The unit cannot change the defined dwelling type, there can be no outside stairway above the first floor other than a required exit, and only one entrance is allowed on the front façade. That last clause is why the door to a Flamborough basement unit goes on the side or the rear. Parking follows Section 5 of the by-law, and up to two spaces for the unit may sit in the required front yard.

Both rural zone sections point to Section 4.33 and record the same amendments — By-laws 21-071, 22-132 and 24-039 — so check the consolidation date on anything you read. Our figures come from the City's May 2025 A1 and August 2024 A2 consolidations and from the amending by-laws themselves.

Detached units and the 1.5-hectare rule

Detached units reached rural Hamilton with By-law 24-039, passed on 27 March 2024 to implement Rural Hamilton Official Plan Amendment No. 39. It added Section 4.33.4: in the A1, A2 and S1 zones, a maximum of one Additional Dwelling Unit – Detached is permitted on a lot containing a single detached dwelling with a minimum lot area of 1.5 hectares. A village lot in Freelton or Millgrove will rarely reach that; a country lot in Strabane or Westover often does. The by-law also excludes lands mapped on Figures 24.1 to 24.5 of Schedule F.

Rear or interior side yard only. At least 1.2 metres from the interior side and rear lot lines, and 7.5 metres from the rear wall of the house — or in a side yard, 4.0 metres from the side wall and 5.0 metres back from the front façade. Maximum height 6.0 metres, no balconies or rooftop patios above the first floor. Gross floor area no larger than the house. Combined coverage of accessory buildings, farm labour residences and the unit capped at 25 percent. An unobstructed path 1.0 metre wide and 2.1 metres clear from the street line to the door. Clause l): the waste disposal and water supply systems must meet the by-law's private-services provision, Section 4.22 iii).

A legally established accessory building that existed on 12 May 2021 may be converted into that one detached unit; any addition over 10 percent of its floor area must meet the full 4.33.4 standards. In Flamborough that often means the drive shed or the second garage.

Old villages, country lots and what sits under them

The township of Flamborough was created in 1974 by amalgamating East Flamborough, West Flamborough and Beverly with the village of Waterdown, and was folded into the enlarged City of Hamilton in 2001, when the census counted 37,796 people. Much of it sits on top of the Niagara Escarpment, the Beverly Swamp fills the western end of the old Beverly Township, and recent decades brought commuters and hobby farmers rather than subdivisions. The Rural Hamilton Official Plan carries fourteen Flamborough settlement area plans.

The villages are old. Lynden dates to 1843 and Freelton to 1856, and Freelton's core still shows the ornate detail of late-nineteenth-century Ontario houses, with newer homes on oversized country lots at the edges. In the village-core century houses we measure headroom and inspect the foundation before we talk about a unit; the country homes of the last fifty years generally have poured foundations and a grade that suits a walkout.

Servicing is the other half. The Greenbelt Plan describes hamlets as typically served by individual on-site sewage and water and allows infill only subject to appropriate water and sewage services. Hamilton's zoning ties a detached unit's water and waste systems to its private-services clause, and the Official Plan carries source-protection maps of vulnerable areas for Carlisle, Freelton and Greensville. On a private-services lot we locate the well, tank and leaching bed before we draw a stairwell: an excavation cannot cross a bed, and a second kitchen and bathroom add flow the system must carry.

The Escarpment and the Greenbelt

The Niagara Escarpment Plan covers about 195,000 hectares across 23 local municipalities in seven regions plus the City of Hamilton; Greensville, with Webster's Falls and Tews Falls, sits right on it. Inside the Niagara Escarpment Commission's Development Control area a Development Permit comes before anything municipal; municipal building approvals can only be issued after it. Applying is free, and the NEC's online map shows whether you are in the Development Control area.

Interior work that does not change the use of a building is exempt, but the NEC lists adding a secondary dwelling unit as a change of use that needs a permit, so a basement apartment in Greensville is never exempt. An addition is exempt if it occupies no more than 93 square metres, is no taller than the original dwelling, and sits at least 4.5 metres from side lot lines, 7.5 metres from the rear and 15 metres from the front. Accessory buildings are exempt up to the lesser of 5 percent of the lot or 72 square metres, and 4.5 metres tall, but never if they create a dwelling unit or habitable space — so a detached suite always needs the permit. Replacing a septic system that serves only your lot is exempt.

The Greenbelt Area takes in the whole Niagara Escarpment Plan area, and Hamilton's rural plan implements the Greenbelt Plan. Where the Protected Countryside applies, it permits single dwellings on existing lots of record and, outside the Natural Heritage System, second dwelling units within those dwellings or within existing accessory structures on the same lot.

Two conservation authorities, one regulation

Four conservation authorities have jurisdiction in Hamilton, and rural Flamborough splits between two of them. The Bronte Creek side is Conservation Halton: Carlisle sits on Bronte Creek, its conservation area is administered by Conservation Halton, and Conservation Halton's regulation covers Hamilton along with Milton, Burlington and Halton Hills. The Spencer Creek side is the Hamilton Conservation Authority, whose attractions Webster's Falls and Tews Falls are in Greensville and which regulates ravines, valleys, sections of the escarpment and other steep slopes, wetlands, rivers, creeks, floodplain and Dundas Valley land, plus the lands adjacent to them. Both run online map tools; check yours before you call anyone.

Since 1 April 2024 both work under Ontario Regulation 41/24. The regulated area around wetlands is 30 metres, a watercourse now means a defined channel with a bed and banks, and low-risk work such as sheds, garage rebuilds and fencing can be exempt on conditions. Permission is needed to construct, reconstruct or place any building or structure, to change a building in a way that increases its size or the number of dwelling units, to grade, or to place or remove fill — so a separate entrance, a walkout, an addition or a garden suite on a regulated lot all need it. The authorities must confirm a complete application within 21 days; Conservation Halton aims to finish its review within four weeks; and an appeal to the Ontario Land Tribunal opens if no decision comes within 90 days.

Permits, sequencing and how HMH runs a rural job

Hamilton moved permitting online in July 2026. The City's Planning, Permitting, Licensing and By-law System at my.hamilton.ca takes building permit and planning applications and lets you track them, with guides at hamilton.ca/pplb and help at City service counters. Building permits are governed by Building By-law 15-058, whose fee schedule prices a permit as a service index multiplied by the floor area of the work; Council amends that schedule, so we quote the current one when we file.

On a rural lot the order of operations saves months. We confirm the zone and the lot area against Section 4.33 and the Schedule F figures, locate the well, tank and bed, and screen the address on both conservation authority maps and the NEC map. Where a Development Permit or a conservation authority permission is needed, it goes in first, because the City cannot issue ahead of it. Then the drawings, the my.hamilton.ca application, and the inspections through to occupancy.

HMH Construction is a licensed, WSIB-covered general contractor with offices in Milton and Mississauga; Flamborough lies directly west of Milton. Separate basement entrances and walkouts are our specialty — permit, engineering, excavation, waterproofing and inspections, with the entrance itself built in three days. We design and permit legal basement apartments, garden suites under the 1.5-hectare rule and garage conversions of existing outbuildings, build additions and second storeys, renovate kitchens, bathrooms and whole homes, and fit out commercial space in the hamlet cores. Call 905-749-4608 with your address and we will tell you which rules you are under.