Multiplex, Garden Suite and Custom Home Builder in
​the Greater Toronto Area​

We help homeowners rebuild, add rental units, and develop small-scale multi-unit properties under Ontario zoning rules.

Titanium Development Homes is a design-build company specializing in small-scale residential development, including duplexes, triplexes, fourplexes and garden suites across the Greater Toronto Area.
We manage zoning review, architectural coordination, permit submission and full construction for homeowners adding rental units or rebuilding into multi-unit properties. With extensive experience alongside established suppliers and subtrades, TDH's team comprises experts in construction, design, project management, and customer service, dedicated to delivering high-quality properties for our customers. 

We specialized in:

• Duplex, Triplex and Fourplex Construction
• Garden Suites and Laneway Houses
• Full Rebuilds and Demolition
• Custom Homes with Rental Units
• Design-Build and Permit Management

​"We build our company on
QUALITY, EFFICIENCY, & SIMPLICITY,
and we believe in working with our customers to achieve goals."
Mickey Bian - President & CEO 

Request a Feasibility Review

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Who We Work With

Built for Homeowners Expanding Their Property Potential

We work with homeowners across the Greater Toronto Area, including Toronto, Markham, Richmond Hill, Pickering and Whitby, who want to rebuild, add legal rental units, or convert single-family homes into duplexes, triplexes or fourplexes. Our team manages zoning review, design coordination, permits and full construction.
Our dedication extends beyond project completion. With regular post-completion evaluations and tailored after-sales support, including flexible service packages and 7-year Tarion warranty options, we provide peace of mind and long-term value for your investment.

Built to Ontario Standards

All projects comply with the Ontario Building Code. We coordinate required inspections and provide Tarion warranty coverage for new home construction where applicable.

What You Can Build on Your Lot?

Recent housing policy updates across the Greater Toronto Area now allow gentle density on many residential lots. Depending on lot size and local zoning, homeowners may be eligible to build:

• Duplex, triplex or fourplex
• Detached garden suite
• Laneway house
• Basement secondary suite
• Full rebuild with multiple units

Many properties across the Greater Toronto Area now allow gentle density under updated housing policies. The final scope depends on the specific zoning of your lot and municipal requirements. Typical multiplex projects range from 2500 sqft to 5000 sqft with construction timelines between 8 and 14 months, depending on scope and approvals.
Note: Eligibility depends on zoning, required setbacks, permitted lot coverage, height limits, servicing capacity and Ontario Building Code requirements.

Frequently Asked Questions

​Can I build a fourplex on my property in the Greater Toronto Area?
Many municipalities now permit up to four residential units on eligible residential lots. Approval depends on zoning, lot size, setbacks, height limits, servicing capacity and compliance with the Ontario Building Code. A property review is required to confirm eligibility.
Are development charges waived for additional units?
In many cases, development charges are reduced or exempt for certain additional residential units, such as secondary suites. Policies vary by municipality and project type, so the exact amount depends on local by-laws and servicing requirements.
How long does multiplex approval take?
Permit timelines vary by city and project complexity. Zoning review, design coordination and permit processing can take several months before construction begins. Projects that require minor variances or additional approvals may take longer.
Do I need separate utilities for a garden suite?
Utility requirements depend on municipal servicing rules. Some projects require separate water, sewer or electrical connections, while others may allow shared services with upgrades. Capacity and access to municipal infrastructure must be reviewed early in the process.
Is demolition required for a rebuild project?
If the existing structure does not support the intended number of units or does not meet structural and code requirements, demolition is often necessary. In some cases, partial retention may be possible, depending on condition, design goals and zoning constraints.
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Note: Permit timelines vary across Toronto, York Region and Durham Region depending on project complexity.

Start with a Property Feasibility Review

If you are considering a duplex, triplex, fourplex or garden suite, we can review your lot and provide clear guidance on development potential, estimated budget range and expected project timeline across the Greater Toronto Area.

Book a Consultation

TITANIUM DEVELOPMENT HOMES​
Tel: +1 647-417-7278  Email: [email protected]
Address: Unit 2003, 8333 Kennedy Rd, Markham ON L3R 5T5