Serving All of Ontario
From our Toronto head office we build across the Greater Toronto and Hamilton Area and Simcoe County, and for the right projects, anywhere in the province.
Local knowledge, province-wide reach
Every Ontario municipality has its own building department, approvals process and site conditions. Toronto Building issues permits across the whole City of Toronto, while Hamilton, the Halton, Peel, York and Durham municipalities, and the towns and cities of Simcoe County each run their own, with regional and county governments responsible for major roads and services.
Our core service area runs from Hamilton and Halton through Peel, Toronto, York and Durham, and north to Innisfil and Barrie. Beyond it, we take on projects across Ontario, from Niagara and Waterloo Region to Ottawa and the North, with a principal leading every job.
We plan approvals, logistics and schedules around those local realities from the first conversation.
Choose your area
Toronto
Toronto is Canada's largest construction market and one of its most demanding places to build.
Building in TorontoMarkham
Markham is one of the GTA's strongest commercial and technology markets, with major office parks, a growing downtown, busy retail and restaurant corridors, and fast-growing neighbourhoods.
Building in MarkhamVaughan
Vaughan combines some of the GTA's largest employment lands with a fast-growing downtown at the Vaughan Metropolitan Centre and established neighbourhoods in Woodbridge, Maple and Kleinburg.
Building in VaughanRichmond Hill
Richmond Hill's Yonge Street corridor and Highway 404 business parks support a dense mix of medical, professional, retail and light industrial tenants, surrounded by neighbourhoods of family homes.
Building in Richmond HillAurora and Newmarket
Aurora and Newmarket anchor northern York Region, with historic downtowns along Yonge Street, growing business parks near Highway 404, and neighbourhoods full of homes ready for basements, additions and renovations.
Building in Aurora and NewmarketInnisfil, Bradford and Barrie
North of the GTA, Bradford West Gwillimbury, Innisfil and Barrie are among Ontario's fastest-growing communities, with new subdivisions, expanding employment lands and steady demand for homes, shops and public infrastructure.
Building in Innisfil and BarrieMississauga
Mississauga is home to major corporate offices, the GTA's busiest industrial and logistics corridors around Toronto Pearson, a growing downtown at City Centre, and established lakeside neighbourhoods.
Building in MississaugaBrampton
Brampton is one of Canada's fastest-growing cities, with extensive industrial lands along Highways 410 and 407 and strong demand for retail, restaurant, medical, community and residential construction.
Building in BramptonHalton Region
Halton Region pairs established lakeside communities in Oakville and Burlington with fast-growing Milton and Halton Hills, creating steady demand for commercial space, home renovations and new infrastructure.
Building in HaltonHamilton
Hamilton is one of Ontario's most active construction markets, with a revitalizing downtown, major industrial lands along the harbour, and older neighbourhoods full of homes worth renovating.
Building in HamiltonDurham Region
Durham Region's lakeshore municipalities, from Pickering and Ajax to Whitby, Oshawa and Clarington, are growing quickly, with new employment lands, retail centres, institutional projects and new neighbourhoods along the Highway 401 corridor.
Building in DurhamAcross Ontario
Beyond the Greater Toronto and Hamilton Area and Simcoe County, we take on projects anywhere in Ontario, from Niagara and Waterloo Region to Ottawa, Kingston and the North.
Projects across OntarioWhy clients choose Harborline Sterling
Construction has enough variables without a contractor who goes quiet. Here is how we take them off your plate.
One accountable team
One contract, one point of contact, one builder responsible for the schedule, the budget and every inspection in between.
Principal-led
One of our founding principals oversees every project, so you get senior judgment, quick decisions and a direct line to the people accountable for the result.
Responsive
Calls returned promptly, questions answered the same day where possible, and problems raised early, while they are still cheap to fix.
Ready to start your project?
Put one accountable team in charge: on schedule, on budget, with permits and inspections handled the whole way.
Start your project
Tell us what you are planning. We will set up a straightforward conversation about scope, budget and timeline, with no obligation.