Home Addition Contractor — Toronto & the GTA
Adding square footage is one of the biggest construction projects you can take on — and the one where planning matters most. We handle home additions across Toronto and the GTA from feasibility and zoning through design, permits, and the finished build, so the new space looks like it was always part of the house. If you are searching for a home addition contractor near you in the Toronto area, start with a written scope and a realistic timeline.
Home additions, planned and built end to end
Second-Storey Additions
Add a full upper floor for bedrooms, a primary suite, or a home office. We assess foundation and structural capacity before design so the existing house can carry the new load.
Rear & Main-Floor Additions
Extend the back of the house for a larger kitchen, family room, or open-concept living space, tied cleanly into the existing roofline and foundation.
Garage Conversions
Turn an attached garage into finished living space — insulation, heating, flooring, and code-compliant egress handled as part of the scope.
In-Law & Secondary Suites
Self-contained suites for multi-generational living or rental income, built to Ontario Building Code requirements for a legal second unit.
Sunrooms & Four-Season Rooms
Bright, insulated additions you can use year-round, with proper foundations and climate control rather than a bolt-on shell.
Bump-Outs & Extensions
Smaller-footprint extensions that gain you a few critical feet — a bigger bathroom, mudroom, or dining nook — without a full addition budget.
How it works
Feasibility & Zoning Review
We check zoning, lot coverage, setbacks, and height limits up front so you know what's buildable — and whether a minor variance is needed — before you commit to a design.
Design, Engineering & Permits
We coordinate drawings and structural engineering, then prepare and submit the building permit application — including the Committee of Adjustment process where a variance is required.
Build, Inspect & Finish
Construction runs in phases with inspections at each required milestone, finishing with interior work that blends the addition seamlessly into the original home.
Frequently Asked Questions
How much does a home addition cost in Toronto?
Home additions in the Toronto area typically run about $300 to $650 per square foot, depending on complexity, finishes, and site access. A full second-storey addition commonly lands between $250,000 and $500,000 or more, while rear additions and bump-outs often fall in the $100,000 to $300,000 range. We provide a written quote after a site visit so the number reflects your actual house and scope.
Do I need a permit for a home addition in Toronto?
Yes. A building permit is required for any home addition in Toronto and across the GTA. When the addition exceeds zoning limits for setbacks, height, or lot coverage, it also needs approval from the Committee of Adjustment (a minor variance). Additions require structural engineering. We manage the drawings, permit application, and variance process for you.
How long does a home addition take?
Plan for roughly 2 to 4 months of design, engineering, and permit or variance approvals before construction starts, then about 3 to 6 months to build depending on the size and whether it is a second storey. We give you a realistic schedule at the quote stage.
Second-storey or rear addition — which is right for my house?
It depends on your lot and foundation. A second-storey addition adds space without losing yard but requires the existing foundation and framing to carry the extra load. A rear or main-floor addition is often simpler structurally but uses up backyard space and lot coverage. We assess both against your zoning and budget before recommending one.
Can I stay in my home during the addition?
In most cases, yes. Additions are built largely from the outside of the existing structure, so we can phase the work and seal off the connection point until late in the project. For second-storey additions there is a short disruptive window when the roof is opened up — we plan that with you in advance.
How do I find a home addition contractor near me in Toronto?
We handle home additions across Toronto and the GTA — central Toronto, North York, Scarborough, Etobicoke, Mississauga, Vaughan, Brampton, Markham, Richmond Hill, and surrounding cities. If you are looking for a home addition contractor near you in the GTA, send us your address and a short description of the addition you have in mind and we will let you know whether the site fits our service area and what a quote visit looks like.
Ready to get started?
Tell us about your project and we'll put together a clear scope and quote.