Teardown and Rebuild Costs in Markham: 2026 Numbers

A teardown and rebuild on a Unionville lot with mature trees and a heritage district review, or on an Angus Glen estate lot with a long setback and a porte-cochère, lands in different places on the spreadsheet. But the all-in range for a typical 3,500 square foot custom home construction in Markham runs $1.4 to $2.1 million in 2026, including demolition, permits, design, HST and contingency. That is the number after the land, after the soft costs people forget, and after the 13 per cent the government takes.

The range is wide because Markham's housing stock spans 19th-century village houses in Unionville and Markham Village to 1990s and 2000s executive homes in Cachet, Angus Glen and Cathedraltown on 50 to 80 foot frontages. A heritage-district rebuild with Heritage Markham review, matched brick and wood siding sits at one end. A net-zero-ready estate with triple glazing, a heat-pump mechanical plant and limestone cladding sits at the other. The lot pattern, the approval path and the finish level move the number more than the square footage does.

Per-square-foot pricing and why it hides the real number

High-end new custom house construction in the GTA runs roughly $350 to $600 and more per square foot of construction depending on architecture, envelope and finish level. Markham builds typically land between $390 and $575 per square foot in 2026, with heritage-district projects and net-zero-ready envelopes pushing toward the top of the range. That per-square-foot number is the construction contract: framing, envelope, mechanicals, millwork, tile, the work a superintendent schedules.

What it does not include: the lot, demolition of the existing house, design and engineering, permit fees, HST, contingency, and the diligence costs before you dig. A survey runs $2,500 to $5,000, an arborist report $1,500 to $4,000 if the City flags trees, and a geotechnical investigation $3,500 to $8,000 where soil conditions or a deep foundation are uncertain. Soft costs for design, engineering and HVAC design typically total 6 to 12 per cent of construction value. HST adds 13 per cent on top of the contract, and a 10 per cent contingency is the floor for any build where the ground is unknown.

A worked example: 3,500 square feet on a Unionville lot

Take a 3,500 square foot two-storey house on a 50 foot lot in Unionville, inside the heritage district boundary. The program is four bedrooms, primary ensuite, secondary ensuite, mudroom, powder room, custom kitchen with local millwork, finished basement with a recreation room and bathroom, attached two-car garage, brick and wood siding to match the district plan, and a heat-pump mechanical system. Construction at $450 per square foot is $1,575,000. Add demolition of the existing bungalow at $18,000, design and engineering at 8 per cent or $126,000, and Markham permit fees at roughly $12,000. Subtotal before tax: $1,731,000.

HST at 13 per cent adds $225,000, bringing the total to $1,956,000. A 10 per cent contingency on the construction value adds another $157,500, landing the all-in budget at $2,113,500. The GST/HST New Housing Rebate can return part of the tax on a new build, subject to CRA rules and price thresholds, which brings the net number down, but the working budget before that rebate is $2.1 million. That is the cheque you write, not the number the estimator quotes.

The line items people forget: design, permits, HST, contingency

Four line items move a $1.5 million construction contract to a $2 million all-in spend, and they show up after the estimate is signed. Design and engineering run 6 to 12 per cent of construction value: architectural drawings, structural engineering for the foundation and framing, HVAC design for the heat-pump system, and revisions during Heritage Markham or architectural-control review if the lot sits in Cathedraltown. On a $1.5 million build, that is $90,000 to $180,000.

Permit fees in Markham are lower than Toronto but still material on a new house: roughly $10,000 to $15,000 for a complete teardown and rebuild, confirmed with the current fee schedule at City of Markham Building Standards. HST at 13 per cent is the largest single addition: $195,000 on a $1.5 million contract. Contingency of 10 per cent covers the unknowns in the ground, the heritage material match that costs more than the estimate assumed, and the change orders that happen when the framing is open. On post-war Markham stock, 10 per cent is realistic. On older Unionville or Markham Village houses, we budget 12 to 15 per cent.

What moves the cost up: basements, garages, finishes, site work

A finished basement with a home theatre, wet bar and bathroom adds roughly $75 to $150 per square foot to the program, so a 1,200 square foot basement lands between $90,000 and $180,000. A three-car garage instead of two adds framing, roofing, doors and concrete: $40,000 to $70,000. Custom millwork kitchens with local cabinetry and stone start around $120,000 and reach $300,000 and up. Primary ensuites run $45,000 to $120,000, and a second ensuite adds another $35,000 to $65,000.

Site work on Markham estate lots is where budgets drift. Interlocking for the auto court and front walk runs roughly $18 to $35 per square foot installed for quality concrete pavers on a full-depth base, $35 to $60 for natural stone or porcelain. A typical driveway and front landscape lands between $25,000 and $60,000; a complete front-and-back program with a rear patio, steps and retaining walls runs $80,000 to $200,000. Grading changes near property lines need a lot grading review in Markham, and retaining walls over about 1 metre high need engineering and a building permit. We see more teardown budgets blown by landscaping than by anything inside the house.

How Markham's development charges compare to the rest of the GTA

Markham's permit-processing speed is a real advantage: complete house applications are typically processed within about ten business days under the Building Code Act review deadlines, faster than Toronto or Vaughan. But development charges and fees still add up. Permit fees for a new house run roughly $10,000 to $15,000, and while that is lower than the $15,000 to $25,000 range in Toronto for comparable square footage, it is not negligible. Confirm the current fee schedule with City of Markham Building Standards before finalizing the budget.

Heritage review in Unionville and Markham Village adds time, not large fees, but the material and massing constraints can push construction costs up by 5 to 10 per cent compared to a build outside the district. Architectural-control approval in Cathedraltown is administered through the community's control architect and precedes the permit submission, adding two to four weeks to the pre-construction schedule. Teardown and rebuild costs in the GTA vary more by municipality than by distance from downtown, and Markham sits in the middle: lower fees than Toronto, faster processing than Vaughan, but tighter design controls in the heritage and controlled districts.

What we would do

We would budget to the top of the contingency range, not the bottom, especially on lots with mature trees flagged by the City or near Rouge tributaries where TRCA clearance might surface a grading constraint. A 12 per cent contingency on a $1.5 million build is $180,000, and we have never had a client complain that they finished under budget. The trade-off we accept: we design the envelope to net-zero-ready performance from the first massing study, which adds three to six per cent of construction cost, because the operating savings pay back and the resale premium is measurable on Markham estate lots. Triple glazing where orientation demands it, upgraded insulation and air-tightness verified by blower-door testing, and heat-pump HVAC with conduit provisions for future solar cost modestly more today and outperform for decades.

On heritage-district lots in Unionville, we would start the Heritage Markham conversation before the design is locked, not after. Massing, setbacks and materials that respect the district plan clear review faster, and revisions after submission add weeks and soft costs. On Cachet and Angus Glen estate lots, we would spend the landscape budget on the auto court and front elevation, not the backyard, because that is what appraisers photograph and what buyers see from the street. The next step is a site walk with drawings: we price what fits the lot, not what fits a template.