How much should I budget for an accessible in-law suite addition in Ottawa?

An accessible in-law suite addition gives a parent or family member with mobility needs their own independent space close to you. Accessibility features add cost compared with a standard addition, so it helps to understand where the money goes.

As broad perspective, a complete ground-level accessible suite with a bedroom, accessible bathroom, kitchen, living area and step-free entrance can range from roughly $200,000 to $375,000 depending on size, foundation and finishes. Treat that as perspective, not a quote.

Accessibility features that drive cost include wider doorways and hallways, a curbless shower with a linear drain and a bench, lower or adjustable counters and accessible cabinets, a step-free entrance with a covered approach, and lever handles and rocker switches. An occupational therapist or accessibility designer can help set dimensions and heights around the person who will live there. Install solid blocking in bathroom walls for grab bars during framing, even if the bars go in later. It costs little during construction and saves a lot of work afterward.

Foundation and floor. A step-free suite needs its floor level planned to match the exterior and the main house, which often points to a slab-on-grade design. Footings on clay or poorly defined soils must be at least 1.2 m deep and not shallower than the depth of frost penetration. In-floor radiant heat is a comfortable option that avoids floor registers in the way of a wheelchair or walker.

The bathroom is usually the most expensive room in the suite. Plan for clear turning space, a comfortable-height toilet, a vanity with knee clearance and slip-resistant flooring.

Code and permits. A self-contained secondary unit always needs a building permit, and the drawings must show the fire-separation walls and floor-ceiling construction. For new construction that means a 45-minute fire separation, or 15.9 mm (5/8 in) Type X gypsum on both sides of separating walls and on the underside of the floor-ceiling framing. Your designer confirms the exact assembly. Check your zoning's lot coverage, setback and height limits before design starts.

Mechanical and electrical. A dedicated ductless heat pump can give the suite its own temperature control. Electrical work needs an ESA notification, and outlets and switches can be placed at reachable heights.

Tax credit. If the suite is for a senior or an adult eligible for the disability tax credit, the federal Multigenerational Home Renovation Tax Credit covers up to $50,000 of qualifying expenses at 14.5 per cent (a maximum of $7,250). It applies only to a self-contained unit with a private entrance, kitchen, bathroom and sleeping area.

You can browse contractors with accessible-construction experience in the Ottawa Construction Network directory and compare itemized quotes.

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Looking for experienced contractors? The Ottawa Construction Network connects homeowners with qualified professionals:

• Justyn Rook Contracting
• RenoMotion Inc.
• M.O.T. CONSTRUCTION INC.
• Home Front Services
• MAK Construction and Development Inc