What kinds of ADU can I build in Markham?

Markham permits additional dwelling units city-wide, but heritage designations in Unionville and Markham Village add a Heritage Section 42 review to rear-yard construction. In practice four forms are buildable in Markham: a detached garden suite, a laneway house, a basement or secondary suite, and a garage conversion. Mixed - heritage-district lots with strict design review, alongside large 1990s subdivision lots in Cathedraltown and Wismer with ample rear yards.

How much does an ADU cost in Markham?

For a 700 sq ft unit in Markham, budget $276,500-$370,500 detached, $94,000-$152,000 for a basement or secondary suite, and $116,000-$171,500 for a garage conversion - about $395/sq ft on new construction. The spread comes from the same measured inputs: $9,000-$15,000 including York Region charges in approvals, a 1.2 m frost depth and 137 cm of annual snow load on the roof structure.

When can you build in Markham?

The workable season in Markham is April-November. Footings have to be poured to 1.2 m before the ground closes; 137 cm of annual snow and -4.5°C average winters set the roof structure, and interior work carries on through the cold months.

Do you serve my neighbourhood in Markham?

Yes. We work regularly in Unionville, Milliken, Cathedraltown, Cornell and across the rest of Markham, plus the neighbouring York Region communities. Markham has 338,503 residents and scores 45/100 on walkability, which is what decides how much parking has to be retained.

ADU Builders in Markham, Ontario

ADU Builders in Markham

Unionville and Markham Village sit inside designated heritage conservation districts, so a rear-yard garden suite there needs Heritage Permit approval on top of the building permit - cladding, roof pitch and window proportion all get reviewed. Cornell and Wismer lots two concessions away have no such requirement.

Building an ADU in Markham

We design, permit and build garden suites, laneway homes, basement secondary suites and garage conversions across Markham, working from Mixed - heritage-district lots with strict design review, alongside large 1990s subdivision lots in Cathedraltown and Wismer with ample rear yards. Markham permits additional dwelling units city-wide, but heritage designations in Unionville and Markham Village add a Heritage Section 42 review to rear-yard construction. Homeowners here budget $9,000-$15,000 including York Region charges before construction, and we quote that separately from the build so the number is never a surprise at permit stage. Our Markham projects run through Unionville, Milliken, Cathedraltown, Cornell, Markham Village and the surrounding streets. With 338,503 residents and major employers including IBM Canada, AMD Canada, Markham Stouffville Hospital, tenant demand for a legal second unit is steady year-round, and the April-November building season shapes when we break ground.

What an ADU costs in Markham

A typical 700 sq ft detached unit in Markham estimates at $276,500-$370,500 - about $395/sq ft. That band is set by $9,000-$15,000 including York Region charges in municipal approvals, a 1.2 m frost-depth footing requirement and 137 cm of annual snow load on the roof structure. The workable season here is April-November.

Permits and zoning in Markham

Markham permits additional dwelling units city-wide, but heritage designations in Unionville and Markham Village add a Heritage Section 42 review to rear-yard construction. Mixed - heritage-district lots with strict design review, alongside large 1990s subdivision lots in Cathedraltown and Wismer with ample rear yards.

ADU Builders in Markham

ADU Builders in Markham