How Much Does It Cost to Build a Custom Home in Toronto and the GTA? (2026)

Short answer: the Altus Group 2026 Canadian Cost Guide puts the hard construction cost of a custom-built single-family home in the GTA at $500 to $1,130 per square foot. That covers construction only. Land, design, engineering, permits, development charges, trees, servicing and HST all sit on top. For a 3,000 square foot home, construction alone works out to roughly $1.5 million to $3.4 million, depending mostly on design complexity and finishes.

Most of our custom home clients already own the lot, often an older house they plan to knock down and replace. This guide is written for them. It breaks down the construction cost, the soft costs and fees that budgets often miss, the City of Toronto rules that apply to a rebuild, the licensing and warranty protections you are entitled to, and the HST rebates on an owner-built home. Figures come from Altus Group, the City of Toronto, the City of Mississauga, the Home Construction Regulatory Authority (HCRA), Tarion and the Canada Revenue Agency, checked in November 2026.

Construction cost per square foot

Altus Group’s annual cost guide is the reference most Canadian builders, lenders and cost consultants use. Its 2026 edition, with data as of January 31, 2026, gives these GTA ranges for hard construction costs:

Type of home	GTA hard cost per sq ft (2026)	3,000 sq ft home
Custom-built single-family home	$500 to $1,130	$1.5 million to $3.39 million
Production single-family home, unfinished basement	$150 to $275	$450,000 to $825,000

The gap between the two lines shows why a custom home costs what it does. A production builder repeats one design many times, buys materials in volume and works on open, level land. A custom home is designed once, for one lot, usually in an established neighbourhood with neighbours, trees and services in the way.

Altus states that its figures are hard construction costs only. They exclude land, architectural and engineering fees, permits and development charges, surveys, contingencies and HST, and they assume a level, open site with stable soil. On a tight Toronto infill lot, plan on the low end of the range being harder to reach.

What moves a custom home along that range

• Design complexity. A simple rectangular plan with a straightforward roof costs far less per square foot than a home with multiple roof lines, cantilevers, curved walls or large spans.
• Finishes and glazing. Large windows and sliding walls, custom millwork, natural stone and premium plumbing fixtures are the biggest finish-level swings.
• The basement. A full-height finished basement, a walkout or an underground garage adds structure, waterproofing and excavation.
• Mechanical systems. Heat pumps, in-floor heating, an elevator or a full home automation system each add cost.
• The site. Poor soil, a high water table, a slope, a ravine lot or tight access for equipment all raise foundation and labour costs.

Soft costs and fees in Toronto

These costs are easy to underestimate because each one looks small, or arrives late. For a knock-down rebuild in Toronto, budget for:

• Design and engineering: an architect or BCIN-qualified designer, a structural engineer, a survey and, usually, a lot grading plan.
• The building permit. In 2026 Toronto charges $18.56 per square metre for a new house, plus $56.33 per new unit, and a zoning applicable law certificate for a new house costs $644.38. For a 3,000 square foot (about 279 m²) home, that comes to about $5,900.
• The demolition permit. Toronto’s demolition fee is very small, so most house demolitions pay close to the $214.79 minimum. The demolition itself is a much larger cost.
• A minor variance, if the design does not fit the zoning. The 2026 Committee of Adjustment fee for a new dwelling is $5,011.08, plus the time it adds.
• Trees. Toronto requires a permit to injure or remove a private tree 30 cm or more in diameter, measured 1.4 m above the ground, and any City-owned street tree. If construction, access or material storage will affect a tree’s protection zone, you need a permit and an arborist’s report, with fees charged per tree. Since September 1, 2026, trees with a stem over 61 cm are a separate “distinctive tree” category.
• New water and sewer connections. Toronto requires new service connections when a building is substantially demolished, meaning more than half of the first-storey exterior walls are removed. The City provides a cost estimate in four to six weeks and targets completion within 12 to 14 weeks of the application, so this belongs on the schedule as well as the budget.
• A contingency of 10 to 15%, because no one sees under an old house until it is gone.

Development charges on a replacement home

Development charges are the largest fee that can apply to a new house. Toronto’s charge for a single or semi-detached home is $137,846 per unit at the rate in effect since June 26, 2025. In most knock-down rebuilds you will not pay it, because Toronto’s development charge by-law credits the units that were demolished, as long as the complete building permit application for the new house is made within 60 months of the demolition permit being issued. One house replaced with one house, within that window, normally nets out.

Mississauga works the same way, with a five-year window from the demolition permit and credits confirmed during the permit review. Other GTA municipalities and regions set their own terms, so confirm the credit with your city before you demolish, and do not let a demolition permit sit for years before you apply to rebuild. If your new home will add a unit, such as a basement apartment, ask how the charges apply to the extra unit.

Licensing and warranty: what you are entitled to

Ontario has strong protections for custom homes, and they are worth checking before you sign:

• Your builder must be licensed. The Home Construction Regulatory Authority says a builder of contract or custom homes on land owned by the homeowner must be licensed as both a vendor and a builder. You can check any builder in the Ontario Builder Directory.
• Your home is covered by Tarion. A contract home built on your land comes with the Tarion warranty: up to $40,000 of compensation if the builder fails to complete the contract, and one-year, two-year and seven-year warranties, the last covering major structural defects, with coverage up to $400,000. Tarion advises owners to register the construction contract with it.
• Building it yourself changes this. HCRA says an owner-builder may not need a builder’s licence as long as they do not sell the home after construction, but the home is then not eligible for warranty coverage.

Our guide on how to vet a GTA contractor covers the questions to ask and the public records to check.

HST and rebates on an owner-built home

HST applies to the construction contract and the materials and services that go into the house. When you build on land you own, you can recover part of it through CRA’s owner-built home rebates:

• The Ontario new housing rebate returns 75% of the provincial portion of the HST, up to $24,000, or $16,080 if no HST was paid on the land. Unlike most housing rebates, it has no value cap, so it applies to expensive custom homes. Ontario has announced that it will end for owner-built homes where construction begins after March 31, 2027.
• Ontario’s enhanced HST relief can cover the full 13% HST, up to $130,000, for an owner-built home where construction begins between April 1, 2026 and March 31, 2027, as long as the home is worth less than $1.85 million at completion, including the land. On a GTA lot, many custom homes will be above that line.
• The federal new housing rebate phases out completely at $450,000, so it rarely applies to a custom home in the GTA.
• First-time buyers building their first home may also qualify for the federal First-Time Home Buyers’ GST rebate of up to $50,000, on homes up to $1.5 million.

Our guide to Ontario’s HST relief and the March 31, 2027 deadline explains these rules in detail. Speak to an accountant before you sign a contract, because the timing of construction can change the rebate you receive.

How long a custom home takes

A custom home moves through four stages, and the early ones often take longer than owners expect:

1. Design and drawings, including the survey, engineering and, for Toronto, a lot grading plan.
2. Approvals. Ontario’s Building Code requires a municipality to issue or refuse a permit for a house within 10 business days of a complete application. A minor variance at the Committee of Adjustment adds months, and tree permits and service connections run on their own timelines.
3. Demolition and new services, where Toronto’s 12 to 14 week target for new water and sewer connections can set the pace.
4. Construction, which depends on size, complexity and the season.

The best way to protect the schedule is to design to the zoning, so no variance is needed, and to apply for tree permits and service connections as early as the process allows.

How to keep a custom home on budget

1. Set the budget before the design. Give your designer a number per square foot, not just a list of rooms.
2. Keep the form simple. A clean plan and roof line saves more than almost any finish choice.
3. Check the zoning first. Designing within the as-of-right limits avoids variance fees and delays.
4. Price the site, not just the house. Demolition, trees, soil and servicing can add six figures on a difficult lot.
5. Get a fixed, itemized contract from a licensed builder, registered with Tarion, so you can see what is included and compare quotes.

Talk to us about your custom home

We design and build custom homes on our clients’ own lots across Toronto and the GTA, and we manage the permits, demolition, services and construction from start to finish. Book a free consultation for a budget built around your lot, or see our custom home services.

Custom home cost FAQs

How much does it cost to build a custom home in Toronto?

The Altus Group 2026 Canadian Cost Guide puts hard construction costs for a custom-built home in the GTA at $500 to $1,130 per square foot. Land, design, permits, trees, servicing, any development charges and HST are extra.

Is it cheaper to renovate or rebuild?

It depends on how much of the existing house can be kept. If the foundation and structure are sound and the layout works, renovating is usually cheaper. If the plan needs a new foundation, a second storey and new services anyway, rebuilding can make more sense.

Do I pay development charges if I knock down and rebuild?

Usually not for a one-for-one replacement. Toronto credits the demolished unit if the complete building permit application for the new house is made within 60 months of the demolition permit, and Mississauga uses a five-year window.

Does my custom home builder need a licence?

Yes. HCRA requires a builder of custom homes on the owner’s land to be licensed as a vendor and builder, and the home is covered by the Tarion warranty.

Can I get an HST rebate on a custom home?

Usually yes. The Ontario new housing rebate returns up to $24,000 with no value cap, and Ontario’s enhanced relief can cover the full HST on homes worth under $1.85 million where construction begins by March 31, 2027.

What is not included in a cost per square foot?

Published per-square-foot figures normally cover construction only. Land, demolition, design, engineering, surveys, permits, development charges, tree work, new service connections, contingency and HST are separate.