Ontario is Canada’s largest construction market by permit volume and declared value. Toronto alone issued 33,967 building permits in 2025 representing about $7.2 billion in construction value, and that is before counting Ottawa, Mississauga, Brampton, Kitchener, and every other Ontario municipality.
For contractors and trades working anywhere in the province, building permit data is the most granular, up-to-date source of construction project intelligence available. The challenge is that Ontario has no province-wide permit feed, each of its 444 municipalities issues permits independently and publishes data on its own schedule.
Why province-wide monitoring matters in Ontario
Ontario’s construction market does not follow uniform geographic patterns. Volume and value shift across the province based on population growth, provincial infrastructure investment, transit expansion, and the energy sector. Contractors who only monitor their home city miss significant opportunities in adjacent markets.
Some patterns visible in provincial permit data:
- The 905-area municipalities surrounding Toronto (Mississauga, Brampton, Vaughan, Markham, Burlington) have generated substantial residential and commercial permit volume as growth spills outside the city limits
- Ottawa’s permit market, while smaller by volume, carries significant institutional weight, federal government, healthcare, and educational projects drive consistent high-value permit activity
- Hamilton has seen increased residential infill and commercial permit activity as buyers and developers price out of Toronto
- Waterloo Region (Kitchener, Waterloo, Cambridge) has grown with the tech sector, generating a mix of commercial and residential permit activity not typically associated with a mid-size Ontario city
Toronto: the Ontario anchor
Toronto issued 33,967 permits in 2025, representing about $7.2 billion in declared construction value. That makes it the largest single-city construction market in Canada by permit volume. 2024 saw 32,624 permits at $7.8 billion, so volume has held broadly flat while dollar totals have shifted with project mix.
Toronto’s permit mix is weighted toward multi-family residential (condominiums, purpose-built rentals, mixed-use towers), commercial alteration, and interior fit-out. The density of the market means permit volume is high, but the average declared value per permit is lower than in some cities, because a large share of the permits are for renovation and alteration work in existing buildings.
For GC-level permit monitoring, filtering Toronto to New Construction and significant Additions filters out most of the noise and focuses on the projects where a GC is being engaged and a sub list is being formed.
Ottawa: institutional and federal
Ottawa issued 2,821 building permits in 2026 through early July, representing about $1.5 billion in declared construction value (as of the July 2026 warehouse snapshot). Ottawa’s permit volume is smaller than Toronto’s, but the project profile is different: a higher proportion of institutional, government, and healthcare projects, which tend to be larger in scope, longer in timeline, and more relationship-driven.
Federal government projects, National Capital Commission developments, Ottawa Public Health, and the University of Ottawa and Carleton University all generate permit activity that is tracked through the City of Ottawa’s permit database.
For contractors focused on institutional and public sector work, Ottawa’s permit feed is one of the most useful in Ontario, not because of volume, but because of the project type concentration.
Hamilton: urban infill and transition
Hamilton has become an increasingly active permit market as the city transitions from its industrial heritage to a mixed residential-commercial economy. Downtown Hamilton residential conversions, transit-oriented development along the LRT corridor (when built), and suburban residential expansion in Ancaster, Stoney Creek, and Binbrook all appear in Hamilton’s permit feed.
For contractors who work in Hamilton and find Toronto too competitive, Hamilton’s permit data often surfaces comparable project types with lower bid competition. Hamilton publishes open building permit data through hamilton.ca.
The 905 and the GTHA
The Greater Toronto and Hamilton Area extends well beyond the City of Toronto’s boundaries. Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, and Burlington all have active construction markets, and all publish permit data separately.
A framing contractor working the 905 might need to monitor five or six separate open data portals to maintain full visibility across their operating geography. Each portal has different data formats, update schedules, and field definitions.
What Ontario contractors use permit data for
Finding new construction projects before sub lists close. The issued permit date is a reliable leading indicator of construction start for most residential and commercial projects. Specialty trades that alert on permit issuance in their geography and work type can reach GCs within days of a permit being issued, before the project is widely known.
Identifying repeat developers. Ontario’s condo and purpose-built rental development community is relatively concentrated, a small number of developers account for a disproportionate share of permit volume. Permit history reveals who they are, where they build, and how frequently.
Tracking infrastructure-adjacent opportunity. Ontario’s provincial transit expansion, Eglinton Crosstown, Ontario Line, Hurontario LRT, generates permit activity in adjacent properties that shows up in municipal permit feeds before it appears in any industry publication.
The pre-permit window
Ontario municipalities publish development applications, Committee of Adjustment decisions, and Official Plan amendments separately from building permits. For large multi-family or commercial projects, the planning application stage precedes the building permit by many months.
SiteWire tracks both issued permits and active planning applications in Toronto and Ottawa, surfacing projects while they are still in the pre-construction phase. This is the window where the project team is being assembled and relationships with developers matter most.
SiteWire’s Ontario coverage
SiteWire aggregates permit data from Toronto, Ottawa, Mississauga, Brampton, Vaughan, Kitchener, and additional Ontario municipalities into a single normalized feed. Filter by city, work type, declared value, or keyword, and get daily alerts when new permits match your criteria.