Understanding the full home remodel cost Ontario runs $100 to $300 per square foot for a gut renovation, over three to six months of construction. One tax rule matters more than any line item. A remodel that removes or replaces 90% of the interior qualifies as a substantial renovation, which Canada Revenue Agency treats like a new house and which opens up to $80,000 of HST relief. A remodel that stops at 85% recovers nothing.
What does a full-home remodel cost in Ontario?
Toronto contractors quote $50 to $600 per square foot depending on scope, and two firms pricing the same scope label disagree by more than double. The table below sets two published 2026 contractor ranges side by side rather than averaging the two into false precision.
| Scope tier | Contractor A | Contractor B |
|---|---|---|
| Cosmetic refresh | $75 to $150 | $50 to $95 |
| Mid-range full renovation | $150 to $250 | $100 to $130 |
| High-end renovation | $250 to $400 | $150 to $600 |
| Full gut renovation | $400 to $550 and above | $180 to $300 |
Why do the per-square-foot ranges disagree?
Scope labels carry no definition. Full gut describes a demolition depth, not a finish level, so one firm applies the label to studs-out work with standard finishes and another applies the same label to studs-out work with custom millwork and imported stone.
Three questions convert a label into a comparable number:
- Demolition depth, meaning whether drywall, mechanical systems, and subfloor come out or stay.
- Mechanical replacement, meaning whether wiring, plumbing, ductwork, and equipment get replaced or reused.
- Finish allowance, meaning the dollar figure assigned per square foot for cabinetry, tile, stone, and fixtures.
How long does a full-home remodel take?
Construction runs three to six months on a standard full renovation and six to twelve months on a full gut, with permit approval running separately ahead of that window.
| Stage | Duration |
|---|---|
| Permit review on a clean submission | 6 to 12 weeks |
| Committee of Adjustment variance, where required | Additional 3 to 4 months |
| Cosmetic renovation construction | 8 to 16 weeks |
| Standard full renovation construction | 4 to 6 months |
| Full gut construction | 6 to 12 months |
The variance line carries the largest schedule risk. A design that stays inside the zoning by-law skips the Committee of Adjustment entirely, and a design that exceeds a setback or height provision by a small margin adds a third of a year before construction starts.
Which HST rule decides the real cost of a full remodel?
The substantial renovation test decides the answer. Canada Revenue Agency Info Sheet B-092 defines a substantial renovation as work removing or replacing 90% or more of the building that existed before the renovation began, excluding the foundation, external walls, interior supporting walls, floors, roof, and staircases.
Crossing that threshold changes the tax treatment of the entire project. Canada Revenue Agency states that a residential complex that has been substantially renovated receives generally the same GST and HST treatment as a newly constructed residential complex, including eligibility for the new housing rebate.
What counts toward the 90% test?
Interior elements count. Interior walls, ceilings, heating systems, electrical systems, plumbing systems, fixtures, cabinetry, and interior finishes all count toward the calculation. Six structural elements sit outside the test: foundation, external walls, interior supporting walls, floors, roof, and staircases.
That exclusion list carries a design consequence. Keeping the original staircase, floors, and load-bearing walls does not reduce the percentage, because those elements never entered the calculation. A homeowner sitting near the threshold crosses the line by extending mechanical and finish replacement rather than by removing structure.
What does the rebate return?
The Ontario Enhanced New Housing Rebate returns up to $80,000 of the 8% provincial portion of HST, and Canada Revenue Agency Notice 346 confirms the rebate reaches substantial renovations rather than new construction alone.
Three conditions apply to an owner who substantially renovates a personal residence: the renovation begins on or after April 1, 2026 and on or before March 31, 2027, the work reaches substantial completion before 2030, and the fair market value at substantial completion stays below $1,850,000. The house must serve as a primary place of residence for the owner or a relation.
The start date governs. A remodel contract signed in late 2026 that breaks ground after March 31, 2027 falls outside the window, and design plus permit approval consumes four to six months on a full remodel.
What does a remodel building permit cost?
Oakville charges $4.90 per square metre for interior alterations, basements, and finishings, with a $200 minimum. A 2,500 square foot remodel therefore carries roughly $1,140 in Oakville permit fees.
Published renovation guides quote $2,000 to $10,000 for permits on a whole-home project. The municipal fee accounts for a small fraction of that figure, and design, engineering, and application drawings account for the rest.
Which obligation sits with the owner before work starts?
Asbestos identification sits with the owner. Ontario Regulation 278/05 requires an owner to determine whether materials likely to be handled, disturbed, or removed are asbestos-containing material before requesting tenders, arranging, or contracting for demolition, alteration, or repair work.
The regulation defines asbestos-containing material as any material holding 0.5% or more asbestos by dry weight. The duty attaches before a contractor is hired, not after demolition uncovers a problem, and a designated substance survey covers ten further regulated substances alongside asbestos, including lead, silica, and mercury.
What belongs in a remodel budget beyond construction?
Five items sit outside a construction quote on a full-home remodel:
- Design and engineering fees, running 5% to 15% of construction cost.
- Municipal permit fees, charged per square metre of altered area.
- HST at 13%, recoverable in part where the work meets the substantial renovation test.
- Contingency, held at 10% to 15% on a standard house and 20% on a pre-1950s house.
- Temporary accommodation, covering the months a gutted house stays uninhabitable.
Modinno Dwellings runs full-home remodels across Oakville, Burlington, Mississauga, Milton, Hamilton, Vaughan, Markham, and Richmond Hill under Tarion licence B64778. Scope definition, drawings, and construction sequence are set out on the home renovation and restoration page.
Frequently asked questions about Ontario full-home remodels
Does a full-home remodel trigger development charges?
No, where the unit count stays the same. Development charges attach to new residential units rather than to renovation work. A remodel that adds a second dwelling unit does add a unit, and Section 2(3) of the Development Charges Act exempts additional residential units in existing residential buildings from the charge.
Why does a pre-1950s house carry a larger contingency?
Older houses hide knob-and-tube wiring, galvanized supply piping, undersized framing, and asbestos-containing materials behind finishes. Toronto renovation pricing holds 20% contingency on pre-1950s houses against 10% to 15% on newer stock, because the scope that gets discovered after demolition cannot be priced before demolition.
Does adding a basement apartment change the remodel path?
Yes. Adding a second dwelling unit brings fire separation, sound transmission, egress, and ceiling height requirements that a single-family remodel avoids entirely, and the permit rate changes with the classification. Those requirements are set out on the legal basement apartment page.
Does a full remodel require a Committee of Adjustment application?
Only where the design breaks a zoning provision. Interior work that leaves the building envelope untouched stays inside the existing zoning permissions. Additions, dormers, raised rooflines, and new openings closer to a lot line trigger the variance route, which adds three to four months before a building permit issues.