General Contractor in Aurora 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.
Your construction partner in Aurora and Newmarket
Harborline Sterling Construction Inc. is a Toronto-based general contractor serving homeowners, businesses and public owners in Aurora and Newmarket. We renovate homes, build and fit out commercial space, and deliver paving, sidewalks, lighting and park projects, with one point of responsibility from permits to keys.
Every project is overseen by one of our founding principals, Mansoor Alam Khan or Maqsood Mohammed.
Construction services in Aurora and Newmarket
Three divisions, one accountable team.
Commercial
New buildings, renovations, tenant build-outs, design-build and construction management for businesses, landlords and developers.
- New Construction
- Remodeling and Additions
- Project Management
- Construction Management
- Tenant and Office Build-Outs
- Design-Build
- Maintenance and Small Works
Residential
Basements, kitchens, bathrooms, additions, driveways, decks and full-home renovations, from one room to the whole house.
- Basements
- Bathrooms
- Kitchens
- Home and Room Renovations
- Additions
- Driveways and Interlock
- Decks, Fences and Outdoor Living
- Roofing, Siding and Windows
- Foundations and Waterproofing
- Accessible Renovations
Infrastructure and Public Works
Roads, sidewalks, street lighting, parks and underground services for municipalities, public agencies, developers and property managers.
- Roads and Paving
- Sidewalks and Curbs
- Street and Site Lighting
- Parks and Playgrounds
- Sewers and Watermains
- Demolition and Site Preparation
Building in Aurora and Newmarket: what to know
Permits and approvals
The Town of Aurora and the Town of Newmarket each issue their own building permits and run their own site plan processes. York Region approvals may apply for regional roads and servicing. Much of the area drains to Lake Simcoe, where the Lake Simcoe Region Conservation Authority reviews work near creeks and wetlands, and parts of Aurora fall within the Oak Ridges Moraine.
Site conditions and logistics
Historic main streets bring heritage considerations and tight access, while newer subdivisions and business parks around Highway 404 bring stormwater management and site plan conditions.
Ontario Building Code
The 2024 Ontario Building Code took effect on January 1, 2025. We work with your designers to make sure drawings, barrier-free design and life-safety systems meet the current Code.
Winter construction
Frost, cold-weather concrete, temporary heat and shorter days affect cost and schedule. We plan for the season from the start, so winter never becomes a surprise.
Where we work in Aurora and Newmarket
Yonge Street and the historic downtowns
Street-front retail, restaurants, offices and heritage-sensitive renovations.
Highway 404 business parks
Office, flex, light industrial and warehouse space.
Established and new neighbourhoods
Basements, kitchens, bathrooms, additions and outdoor living projects.
Why 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.
Frequently asked questions
Who issues building permits in Aurora and Newmarket?
Each town issues its own permits: the Town of Aurora and the Town of Newmarket. York Region approvals may apply where regional roads or servicing are involved.
Do you work further north in York Region?
Yes. We also work in East Gwillimbury, King, Whitchurch-Stouffville and Georgina, and north into Simcoe County.
Can you build while my business stays open?
Yes. We phase work, control dust and noise, schedule disruptive tasks after hours where needed, and keep your staff and neighbouring tenants informed.
What kinds of projects do you take on in Aurora and Newmarket?
Commercial construction and build-outs, home renovations, basements, additions and outdoor projects, and infrastructure work such as paving, sidewalks, lighting and parks.
Start your project in Aurora and Newmarket
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.