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Accessory Dwelling Units in Brock, Ontario: design, permit and build on a single contract. A typical 700 sq ft unit estimates at $268,000-$359,500 (about $383/sq ft), with $7,000-$13,000 including Durham Region and septic charges in municipal approvals and a May-October construction season.

Full-service accessory dwelling unit design and construction across the GTA - we take a single-family lot from feasibility review through permit approval, build and final occupancy sign-off on one contract.
Service area
Brock, Ontario
Durham Region
Typical build estimate
$268,000-$359,500
about $383/sq ft in Brock
Municipal approvals
$7,000-$13,000 including Durham Region and septic charges
quoted separately from the build
Build season
May-October
167 cm snow · -6°C winter avg
Frost depth
1.2 m
footing depth, OBC Part 9
Local market
12,038
residents · walkability 18/100
Brock is the smallest and most rural municipality in the GTA - Beaverton, Cannington and Sunderland together hold barely twelve thousand people. Trade availability, not permitting, is the constraint here: we schedule Brock ADU builds in continuous blocks so crews are not driving ninety minutes each way for a half-day of work. Brock Township permits additional dwelling units; nearly all rural properties depend on private well and septic, with LSRCA review on Lake Simcoe frontage.
Agricultural parcels and Lake Simcoe shoreline lots, with the smallest population and lowest density of any GTA municipality.
Four physical forms are available on a Brock lot - detached garden suite or laneway house, an internal basement or upper-floor suite, a garage conversion, and a factory-built module - and the lot itself, not preference, usually decides which two are realistic. We run a feasibility overlay on the parcel first - zoning envelope, servicing capacity, rear-yard access - and only then price the two forms that survive it. Bill 23 permits up to three residential units as-of-right on most serviced Brock lots, which removes the rezoning application from the default path.
Everything you need to know about our services.
A typical 700 sq ft build in Brock estimates at $268,000-$359,500 - about $383/sq ft, set by $7,000-$13,000 including Durham Region and septic charges in approvals, a 1.2 m frost-depth footing requirement and 167 cm of annual snow load. Final pricing follows the site visit.
Related service: Our ADU services
Brock Township permits additional dwelling units; nearly all rural properties depend on private well and septic, with LSRCA review on Lake Simcoe frontage. Approval costs in Brock run $7,000-$13,000 including Durham Region and septic charges, quoted separately from construction so the permit stage holds no surprises.
Related service: Our ADU services
Agricultural parcels and Lake Simcoe shoreline lots, with the smallest population and lowest density of any GTA municipality. Brock is car-oriented at 18/100 walkability, so parking retention and driveway access constrain the footprint more than the zoning envelope does. We work regularly in Beaverton, Cannington, Sunderland.
Related service: Our ADU services
It is decided by the parcel: a registered lane points to a laneway house, a deep rear yard with side access points to a garden suite, adequate head height points to a basement suite, and an existing attached garage points to a conversion. We measure all four against your Brock lot in the feasibility review before any design fee is charged.
Related service: Laneway Homes
Get a free, no-obligation quote from GTA ADU Builders - zoning review, permit drawings and construction for ADUs across the GTA.