Garage renovations in Ottawa range from a basic insulation + drywall upgrade ($8K-$18K) to full conversion into a heated office, gym, or living space ($45K-$125K). Here's 2026 Ottawa pricing by scope and what permits you'll need.
Spray-foam insulation (walls + ceiling): $4,500-$9,500 for typical 20x20 double garage. Batt insulation alternative (less effective for garages): $2,500-$5,500. Vapour barrier + drywall + paint: $3,500-$7,500. Total basic insulated/finished garage: $8,000-$18,000. Adds 5-10°F to garage temperature in winter (still not living space — typically still 30-50°F mid-winter without active heat).
Full hydronic in-slab heating (requires breaking and re-pouring slab): $18,000-$35,000 for 400 sq ft double garage including new slab. Add-on to insulation/drywall package: total $28K-$55K. Electric in-slab mat (lower cost, higher running cost): $6,500-$13,500. Note: Ontario electrical code restricts in-slab heating circuit sizing — verify with ESA-licensed electrician.
Conversion to heated finished room (gym/office/playroom, not requiring full living-space code compliance): $25K-$55K. Conversion to fully code-compliant living space (Part 9 OBC, requires heating system, egress windows, proper insulation R-value): $45K-$85K. Conversion to secondary dwelling unit (SDU) with kitchen/bath: $85K-$165K + permit complexity. Most Ottawa garage conversions trigger zoning review since detached garages are often non-conforming for residential use.
Epoxy floor coating: $4-$9/sq ft ($1,600-$3,600 for 400 sq ft). Garage door replacement (insulated steel): $1,800-$3,800 single, $2,800-$5,800 double. Garage door opener: $485-$1,200. Garage lighting upgrade (LED + outlets): $850-$2,400. Slat-wall storage system: $1,500-$4,500. Built-in storage cabinets: $3,500-$9,500. Mini-split heat pump for heating/cooling: $4,500-$8,500.
Basic insulation/drywall in attached garage: usually no permit. Heated floor (slab replacement): building + plumbing/electrical permits. Conversion to living space: building permit + Committee of Adjustment if changing use, plus possibly zoning review. Conversion to SDU: full secondary suite permit package — see Canada Secondary Suite Loan and SDU guide. Detached garage to ADU/coach house: separate building permit + zoning conformance review.
Spray foam: $4,500-$9,500 for a double garage. With drywall and paint, total $8K-$18K. Adds 5-10°F vs uninsulated garage — still not living-space warm without active heat.
Yes, but the conversion must meet Ontario Building Code Part 9 requirements (proper insulation R-value, egress windows, ventilation, heating, ceiling height). Cost: $45K-$85K for code-compliant conversion. Permit required. Zoning review often needed.
Full hydronic in-slab system: $18,000-$35,000 (includes new concrete slab). Electric mat alternative: $6,500-$13,500 but higher operating costs over 10-15 year horizon.
Basic insulation/drywall in attached garage: usually no. Slab replacement, heated floors, conversion to living space, conversion to SDU: yes — building permit at minimum, plus mechanical/electrical/plumbing as applicable.
Basic insulation + drywall: 50-70% ROI (utility value, not resale). Epoxy floors + storage: 60-80% (curb appeal). Heated floors: 40-60% (lifestyle, low resale impact). SDU conversion with kitchen/bath: 80-115% (true income-generating, very strong ROI in Ottawa rental market).