Construction Services Across Ontario
Three divisions and 23 services, each scoped to a specific kind of project. Whichever you choose, the work runs through the same accountable process: one contract, one point of contact, permits to closeout.
Choose your starting point
Commercial Construction
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
Residential Construction
Basements, kitchens, bathrooms, additions, driveways, decks and full-home renovations, from one room to the whole house.
Explore all 10 residential services
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
Commercial Construction
Seven services, each scoped to a specific kind of commercial project, so you always know which one fits.
Commercial New Construction
Ground-up commercial buildings, from site work through final closeout.
Learn moreCommercial Remodeling and Additions
Renovation and expansion of commercial buildings you already own or operate.
Learn moreCommercial Project Management
Owner's-side project management: an experienced advocate on your side of the table.
Learn moreCommercial Construction Management
Hands-on leadership of the build: supervision, trades, quality, schedule and inspections.
Learn moreTenant and Office Build-Outs
Interior finish-out that turns leased space into a working office, clinic, store or restaurant.
Learn moreCommercial Design-Build
One contract for design and construction, with cost and constructability built into the design.
Learn moreFacility Maintenance and Small Works
Repairs, unit turnovers, accessibility upgrades and small projects for property managers and owners.
Learn moreMarket sectors
How we build restaurants, clinics, offices, warehouses, places of worship, hotels and more.
View market sectorsTalk to us first
Tell us about the project and we will recommend the approach that fits, even if that means a smaller role for us.
Start a conversationHome Renovation and Residential Construction
From a single room to the whole house, inside and out. Every job gets a written scope, licensed trades and a clean finish.
Basement Finishing and Renovation
Finished basements, legal second units, bathrooms and waterproofing, built to code and permitted.
Learn moreBathroom Renovations
Full bathroom remodels, ensuites, powder rooms and curbless showers, built to stay dry for decades.
Learn moreKitchen Renovations
Kitchen remodels, from new cabinets and counters to open-concept rebuilds.
Learn moreHome and Room Renovations
Whole-home renovations or a single room, done properly: layouts, floors, walls, stairs, lighting and finishes.
Learn moreHome Additions
Rear, side and second-storey additions, sunrooms, mudrooms and garage conversions.
Learn moreDriveways, Walkways and Interlock
Asphalt, concrete and interlocking driveways, walkways, front steps and patios.
Learn moreDecks, Fences and Outdoor Living
Decks, stairs, pergolas, fences, patios and backyard living spaces.
Learn moreRoofing, Siding, Windows and Doors
Roof replacement, siding, eavestroughs, windows and doors that keep the weather out.
Learn moreFoundations, Waterproofing and Concrete
Foundation repair, basement waterproofing, underpinning, sump pumps, backwater valves and concrete work.
Learn moreAccessible Home Renovations
Barrier-free bathrooms, ramps, wider doorways and main-floor living for aging in place.
Learn moreSmall jobs welcome
One room, one bathroom, a deck or a repair. Small projects get the same written scope and clean finish as large ones.
Tell us about itTalk to us first
Tell us about the project and we will recommend the approach that fits, even if that means a smaller role for us.
Start a conversationInfrastructure and Public Works
Civil and municipal work built to Ontario Provincial Standards and each owner's specifications, with safe work zones and complete records.
Roads, Paving and Parking Lots
Road reconstruction and resurfacing, asphalt paving and parking lots, built to OPSS and municipal standards.
Learn moreSidewalks, Curbs and Accessible Crossings
Concrete sidewalks, curb and gutter, curb ramps, multi-use paths and boulevard restoration.
Learn moreStreet and Site Lighting
Streetlights, LED conversions, and parking lot and pathway lighting, with licensed electrical contractors.
Learn moreParks, Playgrounds and Trails
Playgrounds, splash pads, sports courts, trails, shelters and park improvements.
Learn moreSewers, Watermains and Site Servicing
Storm and sanitary sewers, watermains, service connections and stormwater management.
Learn moreDemolition, Excavation and Site Preparation
Demolition, clearing, excavation, grading, erosion control and excess soil management.
Learn moreFrom first call to final handover
Every project follows the same five stages, because predictability is the product.
Consultation
We learn what the project has to achieve, visit the site and give you a straight read on scope, budget range and timeline before anyone signs anything.
Design and preconstruction
We coordinate designers and engineers, price the work against real trade quotes, order long-lead items early, and resolve conflicts on paper, where changes cost nothing, instead of on site, where they cost plenty.
Permits and approvals
Every Ontario municipality runs its own building department and review process. We file with the right authority, answer plan-review comments and coordinate Ontario Building Code requirements, so approvals never become the surprise that eats your schedule.
Construction
Sequenced trades, a site-specific safety plan, quality checks before work is covered up, inspections booked to keep the job moving, and regular updates so you always know where things stand.
Closeout
Final inspections, a deficiency walk-through, as-built drawings, manuals and warranty documents. Then we hand you the keys to a finished space.
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.
Real numbers
Budgets built from real trade pricing, written change orders and plain-language cost reports. No surprises at the end of the month.
Ontario compliance built in
The Building Code, municipal approvals, the Occupational Health and Safety Act, WSIB and the Construction Act are part of how we plan from day one.
A clean finish
Inspections, deficiency lists, training, as-built drawings and warranties, so you take possession with confidence.
Related reading
Home renovationPlanning a Home Renovation in Ontario: Permits, Contracts and Budgets
Permits, licensed trades, written contracts, holdback and budgets: what to sort out before your renovation starts.
Read article
Planning a projectGeneral Contracting, Construction Management or Project Management: Which Fits Your Project?
Three ways to deliver a commercial project, and how to choose the right one for your budget, schedule and level of involvement.
Read articleAbout our services
Which service is right for my project?
Start with the division: residential for your home, commercial for business and investment property, and infrastructure and public works for roads, sidewalks, lighting, parks and underground services. Within commercial, choose new construction, remodeling or a build-out if you want one company to deliver the building, design-build for design and construction under one contract, construction management for closer control of trade costs, or project management for an advocate overseeing others. Not sure? Tell us about the project and we will recommend a fit.
Can I combine services?
Yes. Many projects combine services, such as a basement finish with waterproofing, or a plaza renovation with new paving and lighting. One contract can cover all of it.
Do you work with my architect and engineers?
Yes. We work with your design team, or coordinate architects and engineers for you under a design-build approach.
Do you take on small jobs?
Yes. Small residential jobs and commercial small works get the same written scope, licensed trades and clean finish as large projects.
Do you handle permits and approvals?
Yes. We prepare and manage permit applications with the municipality that governs your site, respond to plan-review comments, and coordinate Ontario Building Code requirements, inspections and any conservation authority approvals so the schedule holds.
What areas do you serve?
We are based in Toronto and work across Ontario. Our core service area runs from Hamilton and Halton through Peel, Toronto, York and Durham, and north to Innisfil and Barrie. For the right projects, we work anywhere in the province.
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.