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Top Triplex Builders In Ottawa
With Ottawa's new Zoning By-law 2026-50 now in effect, triplexes are permitted as-of-right in N2 zones across the city — a major shift from the old rules that required rezoning applications for most three-unit builds. This opens up significant opportunities for Ottawa property owners and investors. But building a legal, code-compliant triplex takes a builder who genuinely understands multi-unit residential construction. Here are the top triplex builders in Ottawa for 2026.
| Builder | Triplex Approach | Design-Build Integration | Best For |
|---|---|---|---|
| Ottawa General Contractors — Top Choice | New builds, conversions, infill triplexes | Fully integrated in-house design, permit & build | Investors wanting a fully managed, legal triplex with fixed pricing |
| OakWood Designers & Builders | Large renovation conversions | Strong design-build with showroom design support | Homeowners wanting extensive design support for a major conversion |
| Modello Homes | Custom triplex builds and infill | Collaborative design approach with partners | Design-forward clients seeking modern infill triplex builds |
| Omega Homes | Custom multi-unit and infill builds | Design-build with external collaborators | Higher-end triplex builds on premium Ottawa lots |
| Sunter Homes | Multi-unit residential projects | Traditional builder-led process | Clients wanting a smaller-scale builder with a personal touch |
Ottawa General Contractors
Ottawa General Contractors (OGC) is Ottawa's most experienced design-build firm for triplex construction and multi-unit conversion. A triplex is a more complex undertaking than a duplex — it requires careful attention to fire separations, egress from each unit, plumbing stacks, mechanical design, and parking compliance, all while maximizing the rentable floor area on the lot. OGC's integrated team handles all of it, from zoning feasibility through design, permits, and construction.
Under the new N2 zone rules, a triplex is permitted as-of-right without a rezoning application on most Ottawa residential lots. See our guide on Ottawa N2 zoning rules to understand the specific requirements. For larger lots that might support more than three units, our N3 zoning guide covers up to 10-unit projects.
Services Offered
- New triplex construction on N2 and N3-zoned lots
- Single-family to triplex conversion with full permit management
- Proforma and investment return modelling for triplex projects
- Full in-house design, 3D visualization, and construction
- Coordination of all permits, inspections, and utility connections
Location & Service Area
- Office: 1886 Merivale Road, Suite 200, Nepean, ON K2G 1E6
- Service Area: Ottawa and the National Capital Region
Contact Information
- Phone: (613) 225-9991
- Email: info@ottawageneralcontractors.com
- Website: ottawageneralcontractors.com/duplex-triplex-construction-in-ottawa
Recent Reviews
"We hired Ottawa General Contractors for the rebuild of our home, and we couldn't be happier with the results. From the initial consultation with Nick, through construction with Adam and finances with Jennifer — the team was professional, communicative, and attentive to every detail. They ensured we understood the process the entire way through and any decisions or changes were communicated clearly. The craftsmanship is top notch."
"I recently had the pleasure of working with OGC for the design and build of our coach house, and I cannot recommend them highly enough. Nick and Alain were particularly instrumental in guiding me through the design and permit application process. Their expertise made what could have been a daunting experience incredibly smooth. A special shoutout goes to Abdul, who oversaw the workmanship and execution."
OakWood Designers & Builders
Background & Services
OakWood is one of Ottawa's most established design-build firms, with roots going back to 1956. For property owners converting a large existing home into a triplex, OakWood offers substantial renovation capabilities and a structured design process supported by multiple Ottawa design studios. They are a strong option for complex whole-home transformations rather than ground-up triplex builds.
- Large-scale home conversion and renovation work
- Secondary suite and multi-unit additions
- In-house architectural design and 3D visualization
Location
- Headquarters: 865 Taylor Creek Dr, Ottawa, ON K4A 0Z9
- Glebe Studio: 555 Bank Street, Ottawa, ON K1S 5L7
Contact Information
- Phone: (613) 236-8001
- Website: oakwood.ca
Modello Homes
Background & Services
Modello Homes is a custom home builder with over 30 years of combined experience among its partners and key team members. They specialize in modern, design-forward residential builds, including custom infill projects. For clients who want a triplex that stands out architecturally on an Ottawa infill lot, Modello brings a refined design sensibility and quality craftsmanship. They are a registered Tarion builder and a member of the Greater Ottawa Home Builders' Association.
- Custom triplex and infill multi-unit builds
- Modern residential design with timeless quality
- Estate and infill lot projects across Ottawa
Location
- 1623 Westhall Way, Ottawa, ON K2M 0G7 (Kanata)
Contact Information
- Phone: +1 (613) 316-2103
- Website: modellohomes.ca
Omega Homes
Background & Services
Omega Homes is a custom residential builder with a focus on quality from start to finish. As a Holmes Approved Homes builder and registered Tarion builder, they serve clients across Ottawa neighbourhoods — from Alta Vista and the Glebe to Kanata and Manotick. Their design-build process can accommodate custom triplex builds on infill lots for clients who want an above-average finish level.
- Custom triplex and multi-unit new builds
- High-end infill construction across Ottawa
- Full design-build process with Tarion warranty coverage
Location
- Ottawa, ON — builds in most Ottawa neighbourhoods and estate areas
Contact Information
- Phone: 613-618-HOME (4663)
- Website: omegahomes.ca
Sunter Homes
Background & Services
Sunter Homes is a custom and semi-custom luxury home builder established in 2010. They work with award-winning architects and designers, and have taken on multi-unit residential projects alongside their single-family and townhome work. For clients wanting a smaller, more personal builder relationship on a triplex project, Sunter offers a hands-on approach.
- Custom and semi-custom homes and multi-unit projects
- Collaboration with award-winning architects and designers
- High-end custom residential construction in Ottawa
Location
- Ottawa, ON (Greater Ottawa area)
Contact Information
- Phone: (613) 913-9697
- Website: sunterhomes.com
What Makes a Great Triplex Builder?
A triplex is meaningfully more complex than a duplex. Fire separations between all three units must meet Ontario Building Code requirements. Each unit needs proper egress, its own mechanical systems or clearly separated shared systems, and separate utility metering is strongly advisable. The builder you choose should have demonstrated experience with multi-unit residential construction in Ottawa specifically — not just general renovation work.
Key questions to ask any triplex builder:
- How many legal triplex builds or conversions have you completed in Ottawa?
- Do you manage the building permit application and all required inspections?
- Can you show me the fire separation and egress details from a recent triplex project?
- Do you carry WSIB and liability insurance?
Our guides on N2 zoning and building units on a typical Ottawa lot will also help you assess whether a triplex is the right scale for your property. And before you start, check whether your property might also qualify as a fourplex or larger multiplex under the new rules — see our guide on N3 zone rules for multi-unit buildings.
Who Is the Best Triplex Builder in Ottawa for Me?
For most Ottawa property owners and investors pursuing a triplex build or conversion, Ottawa General Contractors offers the most complete package: integrated design, zoning expertise, permit management, and a proven track record in multi-unit residential construction under one accountable team. Contact OGC today for a free triplex feasibility review.
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