Renovate or Rebuild? Teardown and Renovation Costs Compared

When renovation quotes keep climbing toward the price of a new house, starting again is worth pricing. Renovating usually costs less per square foot than tearing down and rebuilding, but the gap closes when the foundation, the layout and every system need replacing, and in Toronto the zoning can make the choice for you once half the main walls come out.

Renovate or rebuild: the cost per square foot

Per-square-foot figures for a major renovation count only the floor area renovated, while a rebuild is priced on the full floor area of the new house. The table sets the two side by side on contractors' and builders' 2026 figures; none of them includes land, which you already own.

A rebuild is priced like any new house, so the figures for building a new house apply once the old one is gone. On a BC builder's 2026 figures, custom builds in Vancouver run $450 to $800+ a square foot and Metro Vancouver as a region averages $350 to $600+, above most renovation figures there.

A worked example: the same brief, two routes

Take an 1,800 sq ft Toronto house whose owners want 3,000 sq ft. One route gives the existing house a major renovation and adds 1,200 sq ft; the other demolishes it and builds 3,000 sq ft new. At the 2026 Toronto rates in the table above, the arithmetic runs like this.

The ranges overlap, and where your quotes land inside them decides it. A renovation at the top of its range costs more than a rebuild at the bottom of its range, and the things that push a renovation to the top are the same ones that argue for a rebuild: a foundation, framing and services that all need work.

HST at 13% comes on top of either contract: about $130,000 to $273,000 on the renovation and $175,000 to $372,000 on the rebuild. A North Vancouver builder's 2026 figures show the same pattern on a smaller budget: a 1970s house priced at $450,000 to renovate against $650,000 to rebuild.

Costs a rebuild quote leaves out

A builder's per-foot price covers construction. On a rebuild the owner usually pays separately for demolition and site work, design, permits and municipal charges, services and landscaping, rent while the house is gone, HST and the contingency.

Calgary charges its off-site levy on new homes if a levy has not previously been paid on the property, so a rebuild there raises the same question. The Toronto demolition allowance includes basic abatement; further asbestos removal runs $5,000 to $50,000 or more on a renovation in a national 2026 planning range, and a demolition disturbs every material in the house, not only the rooms a renovation would touch.

When renovating makes more sense

A renovation keeps what is still good. It wins when most of the house passes that test.

• The foundation and frame are sound. An engineer's report that clears both removes the biggest unknown from a renovation quote.
• The layout mostly works. Moving a kitchen or opening a wall is renovation work; moving every room is a rebuild in all but name.
• You need more room, not a different house. Adding a second storey or a rear addition keeps the foundation and services you already paid for.
• The zoning would shrink a new house. An older house can sit closer to the lot lines than today's setbacks allow, and a replacement house has to meet current zoning or win a variance.
• You want to stay through part of it. A renovation done floor by floor can leave a working bathroom and kitchen in place; a rebuild never can.

When rebuilding makes more sense

• The foundation is failing or too low. Footings and a basement that need replacing are costly to fix from inside a standing house; full-perimeter underpinning to lower the basement runs about $60,000 to $120,000 for a detached or semi-detached house on a Toronto firm's 2026 figures, before any other work.
• The plan fights the structure. Low ceilings, bearing walls in the wrong places and stairs that cannot move mean paying to rebuild the inside while keeping the shell's limits.
• Every system is due. Old wiring, old plumbing, a failing envelope and an undersized electrical service at once put a renovation near the top of its range.
• Water has done its damage. Rot and mould in framing and sheathing, in houses that have taken years of coastal rain, can run deeper than a renovation budget assumes.
• The renovation quote nears the rebuild quote. At that point a new house brings a new foundation, a new envelope, new services and a new home warranty for little more.
• The zoning allows a bigger house. Where the lot can carry more floor area than the house on it, building new adds it in one go.

A quick test settles most cases: list what a renovation would keep. If the foundation, the framing, the roof and the exterior walls all stay, the renovation buys a lot of house back cheaply. If most of them come out anyway, you are paying renovation prices for new construction without the new foundation, the new envelope or the warranty that a rebuild brings.

Zoning and tax rules that can decide it

Toronto: the 50% main-wall rule

Under Toronto's Zoning By-law 569-2013, a building is not lawfully existing if 50% or more of the main walls of the first storey or above are removed or replaced. A deep renovation that crosses that line loses the standing an older house has for setbacks, height or coverage that current rules would not allow, and has to meet current zoning or win a minor variance.

The same logic runs the other way on a rebuild: settle the replacement design and its approvals before the old house comes down, because demolishing first can give up setbacks the existing house was allowed to keep. A variance goes to the Committee of Adjustment, whose 2026 fee is $2,228.98 for an addition or alteration to a house with up to three units and $5,011.08 for a new one, and the decision can be appealed to the Toronto Local Appeal Body within 20 days.

When a renovation counts as a new house

In Alberta, a renovation needs no licensed builder and no home warranty unless it leaves over 75% of the finished home as brand new construction. Past that line, the builder needs a licence and the house needs new home warranty coverage, so a deep renovation there takes on a new build's rules.

For GST/HST, the CRA treats a house as substantially renovated when at least 90% of the interior is removed or replaced; the foundation, external walls, interior supporting walls, floors, roof and staircases do not count toward the 90%. A substantially renovated house can qualify for the GST/HST new housing rebate, claimed on Form GST191 when you did the work or hired someone to do it.

Demolition permits and asbestos, city by city

Ontario's Building Code Act bars anyone from demolishing a building without a permit, and Calgary, Edmonton and Vancouver require one too. What differs is the fee and where the demolition permit sits against the new-house permit.

Ottawa charges $1,170 for a demolition permit on property under its Demolition Control By-law. In Vancouver, the demolition permit comes first, then the required salvage and abatement work, then the demolition, and a refund follows once the recycling and reuse compliance report has been reviewed.

Asbestos is the cost that surprises. WorkSafeBC tells homeowners to get the house tested for asbestos before a renovation or demolition: a full demolition samples every asbestos-containing material, a partial renovation only the areas being renovated.

How long renovating or rebuilding takes

From demolition on, a rebuild runs through the stages of a new build: foundation, framing to lock-up, rough-ins, finishes and final inspections. A major renovation saves the foundation and framing stages but adds demolition inside the house and whatever the walls reveal.

Permit review is a small part of either calendar. Toronto reviews a complete application for a new detached house within 10 business days, and Calgary puts a new-house building permit at about 21 days, with 10 to 12 weeks more where a development permit is needed.

Where you live during the work

A rebuild means moving out from demolition to occupancy. A renovation lets you stay only while one bathroom and a basic way to cook survive each phase, so gutting the main floor usually means moving out too, and a staged renovation that works floor by floor is the exception.