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Accessory Dwelling Units in Milton, Ontario: design, permit and build on a single contract. A typical 700 sq ft unit estimates at $273,000-$366,000 (about $390/sq ft), with $7,500-$13,000 including Halton Region charges in municipal approvals and a April-November 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
Milton, Ontario
Halton Region
Typical build estimate
$273,000-$366,000
about $390/sq ft in Milton
Municipal approvals
$7,500-$13,000 including Halton Region charges
quoted separately from the build
Build season
April-November
131 cm snow · -4°C winter avg
Frost depth
1.2 m
footing depth, OBC Part 9
Local market
132,979
residents · walkability 44/100
Milton is the rare GTA suburb built with rear service lanes - the Ford and Hawthorne Village subdivisions were laid out with them from the start. That gives newer Milton homes something downtown Toronto pays a premium for: real laneway access for a coach house, on a lot whose services are less than twenty years old. Milton permits additional residential units town-wide; the fastest-growing municipality in the GTA also has the newest housing stock, so most units are new-build rather than conversions.
Post-2005 subdivision lots with rear lanes in the Hawthorne Village and Ford areas - an unusually laneway-friendly suburb. Milton sees 131 cm of snow and -4°C winter averages.
Four physical forms are available on a Milton 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 Milton 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 Milton estimates at $273,000-$366,000 - about $390/sq ft, set by $7,500-$13,000 including Halton Region charges in approvals, a 1.2 m frost-depth footing requirement and 131 cm of annual snow load. Final pricing follows the site visit.
Related service: Our ADU services
Milton permits additional residential units town-wide; the fastest-growing municipality in the GTA also has the newest housing stock, so most units are new-build rather than conversions. Approval costs in Milton run $7,500-$13,000 including Halton Region charges, quoted separately from construction so the permit stage holds no surprises.
Related service: Secondary Suites
Post-2005 subdivision lots with rear lanes in the Hawthorne Village and Ford areas - an unusually laneway-friendly suburb. At 44/100 walkability, Milton suites usually keep one parking space: enough to clear the zoning review without surrendering the whole yard. We work regularly in Old Milton, Hawthorne Village, Scott.
Related service: ADU Building Permit
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 Milton 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.