R. VIAU
CONSTRUCTION &
DEVELOPMENTS
Secondary Dwelling Unit Construction in Ottawa
At R. Viau Construction and Developments, we specialize in designing and building custom secondary units that unlock the full potential of your property—while complementing the layout and character of your existing home.
Whether you're adding a legal rental suite, creating a comfortable space for extended family, or planning for future flexibility, we tailor every secondary unit to suit your lifestyle, property layout, and long-term goals. From the initial design to final inspection, our team manages the entire process with a focus on craftsmanship, code compliance, and client satisfaction.
The result is a fully functional, self-contained living space that adds value, versatility, and livability to your home—built to the highest standards and designed for everyday comfort.
What is a secondary unit?
How much does it cost to build a secondary unit?
A secondary unit is a self-contained living space within or on your property that includes its own kitchen, bathroom, and sleeping area. It can be a basement apartment, an attached suite, or a separate structure like a coach house.
Costs depend on size, design, existing conditions, and finishes. On average, expect to invest anywhere from $100,000 to $150,000 or more. We provide a detailed estimate tailored to your project’s scope and goals.
Our Process - Built Around You
Feasibility Assessment
Our team evaluates your home to ensure a secondary unit is possible and compliant with local zoning and building codes.
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Zoning and bylaw review
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Lot measurements and layout analysis
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Access, parking, and service connection checks
Design & Architectural Planning
Our in-house designers work closely with you to create a secondary units that’s both functional and aesthetically aligned with your main home.
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Custom Floor Plans: Designed around your goals—rental income, family use, or flexible living.
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Smart Layouts: Space-saving design features like lofts, built-ins, and open-concept kitchens.
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Safety: Our team at Ottawa Fire Safety assures safety for all tenants.
Permitting & Approvals
We take care of the entire permit process on your behalf.
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Complete permit application submission
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Liaison with city planners and building officials
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Revisions or resubmissions if required
You don’t have to deal with paperwork, city departments, or inspectors—we manage it all for you.
Full Construction Management
From framing to final finishes, our experienced crew and trusted trades handle every aspect of construction with precision and care.
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Structural framing, roofing, windows, and doors
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Plumbing, electrical, and HVAC installation
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Insulation, drywall, flooring, and cabinetry
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Kitchen and bathroom build-outs
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Exterior finishing and landscaping (if included)