Building a Custom Home in Canada: Steps and Timeline

A custom home is two projects: designing and permitting it, then building it. On a 2026 Ontario builder's timeline the first takes 3 to 6 months and the second 6 to 12, about 10 to 18 months from the first design meeting to move-in. A zoning variance can stretch the first by months.

How long it takes to build a custom home

Each stage has to pass an inspection or an approval before the next one starts, so a late approval pushes every later stage back.

On one Toronto builder's 2026 figures, custom homes in Toronto take 9 to 12 months with no variance, 12 to 16 months with one, and 14 to 18 months or more for a large or luxury house. Tree permits and appeals of a variance decision are common reasons a Toronto calendar slips. Further west, a North Vancouver builder's 2026 figures put a custom home at 19 to 36 months or more.

Building a custom home, step by step

Check the lot before you buy it

A lot can look buildable and still be the wrong one. Check what the zoning allows on it (use, height, setbacks and lot coverage), how it is reached and serviced, whether a conservation authority regulates any part of it, and what the soil will carry, which takes a survey and a geotechnical report. In Toronto, work that can injure or remove a tree of 30 cm or more in diameter, measured 1.4 m above the ground, or any street tree, needs a permit.

On a lot that already holds a house, the choice between renovating it and tearing the old one down comes before any design work, because demolition, rent and the zoning on the existing house all change the budget.

Design and drawings

In Ontario, permit drawings for a house can come from a qualified designer, an architect or an engineer, and the province advises checking that whoever prepares them is on the Ministry of Municipal Affairs and Housing's QuARTS public registry. Calgary says an architect or professional engineer may be required to design and inspect the project, with any engineer registered with APEGA.

Approvals and the building permit

In Toronto a new detached or semi-detached house with up to two dwelling units goes through the House Stream, where complete applications are reviewed within 10 business days. Complete means plans, an issued Zoning Applicable Law Certificate, every other applicable law met and the fees paid; an incomplete application has no time frame. A new house also needs a survey-based site plan, a lot grading plan, an energy efficiency design summary and, where trees could be damaged, a tree declaration, and the 2026 fee of $18.56 per square metre comes to about $5,230 on 3,000 sq ft, unit fee included.

A design that needs relief from the zoning by-law goes to the Committee of Adjustment first. Its 2026 fee for a new house with up to three units is $5,011.08, and the applicant, the Minister or a specified person or public body can appeal the decision to the Toronto Local Appeal Body within 20 days.

Calgary issues a new house under one Single Construction Permit that includes the plumbing, electrical, gas and HVAC permits, and puts the review at about 21 days, which it says is not a guarantee. A design that breaks the Land Use Bylaw also needs a development permit, which the City puts at 10 to 12 weeks for a single detached house in the developed area.

Construction and inspections

Once the permit is issued, the inspector sees the house at set stages. Toronto's inspection stages run footings before the pour, the foundation, framing with the plumbing and heating rough-ins, insulation and vapour barrier before they are covered, then the final interior and exterior inspections, and anything covered before it passes has to be uncovered. Inspections can be booked up to four weeks ahead.

Calgary books inspections in phases, and each phase must pass before the next can be booked. Inside, a new house follows the same rough-to-finish order as a large renovation: rough-ins, inspection, insulation, drywall, then cabinets, flooring and fixtures.

Who can build a custom home: a licensed builder or you

In Ontario, a builder who builds custom homes on land the owner holds must be licensed, so check a valid builder's licence before you sign. On a contract home, where you own the land and one builder supplies all of the labour and materials, Tarion's backstop for financial loss is up to $40,000 if the builder fails to substantially perform the contract.

Cover runs from possession in Ontario, from occupancy or the first occupancy permit for a BC custom home, and from the earliest of occupancy, permission to occupy or title transfer in Alberta, so statutory warranty coverage starts at move-in, not at the contract date.

How a custom home is paid for: draws and the holdback

Builders price a custom home as a fixed price or cost-plus, and either way the money moves in stages. CHBA's homeowner guide to renovation contracts puts a deposit at signing at 5 to 15% of the contract and ties progress payments to milestones such as a poured foundation and an enclosed frame.

On a new house the draws usually follow the stages in the timeline table: foundation, framing to lock-up, rough-ins and drywall, then completion. If a construction mortgage pays for the build, the lender also advances money as stages are finished, so the builder's draw schedule and the lender's need to match before you sign.

Ontario, BC and Alberta each make the owner keep back 10% of the value of the work in every draw as a lien holdback, released only once the period for subcontractor liens has passed. CHBA notes that holdbacks are often placed in trust with a lawyer until the release date.