Blog > Multi-Generational Living in Markham Which Neighbourhoods Have the Best Lots for Garden Suites and Coach Houses?
Multi-Generational Living in Markham Which Neighbourhoods Have the Best Lots for Garden Suites and Coach Houses?
by
Multi-Generational Living in Markham — Which Neighbourhoods Have the Best Lots for Garden Suites and Coach Houses?
Multi-generational living is not a trend in Markham — it is a deep cultural practice and economic necessity. With Ontario's Additional Residential Units policy now allowing up to three additional units, here is the neighbourhood-level analysis.
The Legal Framework — What Ontario Now Allows
As of 2024, the Ontario Planning Act permits up to two Additional Residential Units on most properties where single-detached, semi-detached, or townhouses are permitted. The City of Markham is actively updating its Official Plan to allow up to three Additional Residential Units, meaning four residential units total on a single property.
The Value Calculation: This legislative evolution fundamentally changes the value calculation for large-lot properties in Markham communities with the right physical characteristics for additional structures.
Unit Types: A garden suite is a detached unit in the rear yard. A coach house is a unit built above a detached garage. A legal basement apartment is a self-contained unit within the existing home's footprint.
Cornell vs Box Grove — The Head-to-Head Analysis
Two of Markham's most popular communities offer distinctly different advantages for multi-generational living. Understanding the physical lot characteristics is key to choosing the right neighbourhood.
| Feature | Cornell | Box Grove |
|---|---|---|
| Lot Width | 25 – 30 feet | 40 – 55 feet |
| Lot Depth | 80 – 100 feet | 100 – 130 feet |
| Rear Access | Rear Lane (Standard) | Side Yard (Typical) |
| Best For | Coach Houses | Garden Suites |
| Design Tradition | Built-in Coach House Provisions | Executive Detached |
Cornell
Cornell's New Urbanism design language — rear lane garages, coach house provisions built into the original design specifications — makes it one of the most naturally suited Markham communities for additional unit creation. Coach houses in Cornell are not a retrofit concept; they were designed into the community from inception.
The original planning documents for Cornell explicitly included coach house provisions above rear lane garages as an intended housing typology — making coach house legalization in Cornell significantly more straightforward than in communities where this typology was never contemplated.
No need to run a driveway through the main yard to access a rear structure. Makes coach house construction practical.
For families where grandparents or adult children need a self-contained unit immediately adjacent to the main home.
Box Grove
Box Grove sits at the other end of the lot size spectrum. Arista-built executive detached homes in Box Grove sit on lots that range from 40 to 55 feet wide and 100 to 130 feet deep — in some cases exceeding these dimensions on premium ravine lots along Smoothwater Terrace and adjacent streets.
A garden suite on a Box Grove lot of 50 feet by 120 feet can accommodate a 700 to 900 square foot standalone structure in the rear yard — sufficient for a two-bedroom independent dwelling with its own kitchen, bathroom, and living area. This is the format most suited to true multi-generational living where a separate household needs genuine independence from the main home while maintaining proximity.
⚠️ Box Grove Considerations
- No Rear Lane: Most lots do not have rear lane access, meaning the garden suite must be designed to work with side yard access from the driveway.
- Site Planning: Requires more careful site planning than Cornell's rear lane access format.
- Permitting: Box Grove does not have the same coach house tradition as Cornell, so the legalization pathway involves navigating the full building permit process.
Other Markham Communities Worth Evaluating
Markham Village and Bullock
Markham Village's mid-century backsplits, sidesplits, and bungalows sit on large mature lots — frequently 60 feet wide or more — that provide genuine garden suite potential. The Heritage Conservation District designation that covers parts of Main Street Markham does not extend to the residential streets behind it, so most Markham Village residential properties are not subject to heritage restrictions on additional structures.
The combination of large lots, lower purchase prices relative to Angus Glen or Unionville, and excellent GO Train access makes Markham Village an underappreciated multi-generational living destination.
Greensborough
Greensborough's detached homes sit on lots ranging from 30 to 45 feet wide — smaller than Box Grove but larger than many Cornell lots. The community lacks Cornell's coach house infrastructure but has the lot depth (typically 90 to 110 feet) to accommodate a rear garden suite on the larger lots within the community.
For families targeting Mount Joy GO Station walkability alongside multi-generational capacity, Greensborough offers a practical compromise.
What to Look For When Buying for Multi-Generational Potential
✅ Key Variables for Suitability
- Lot Width: Minimum 30 feet for a viable garden suite, 40 feet preferred.
- Lot Depth: Minimum 100 feet for a useful rear yard structure after setbacks.
- Rear Lane Access: Significantly simplifies coach house construction.
- Zoning Confirmation: Contact Markham Building Standards before purchasing to confirm your specific address's eligibility for additional units.
Every family's configuration is different — grandparents who want a self-contained unit 20 feet from the main house have different requirements than adult children who need a separate dwelling with its own parking and entrance.
Need Help Evaluating Multi-Generational Potential?
Michael John Lau evaluates every property's multi-generational potential as part of the buyer analysis for families with this priority — mapping lot dimensions, rear lane access, zoning, and the specific unit configuration needed against the available Markham housing stock.
🏆 Michael John Lau — Awards & Recognition
Michael John Lau is a licensed REALTOR® serving buyers and sellers in Markham, Ontario and the Greater Toronto Area. Zoning and permit requirements change. Always confirm eligibility for additional residential units directly with Markham Building Standards at 905-475-4870 before purchasing for this purpose. This article is for informational purposes only and does not constitute legal or financial advice. Not intended to solicit clients currently under contract with another brokerage.
More From the Blog
