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Trusted across 30 GTA municipalities
ADU Builders in the GTA. Build a Second Home on the Lot You Already Own
Garden suites, laneway homes, basement suites and garage conversions across 30 GTA municipalities - design, permits and construction by one established team.
Serving Toronto and 29+ other GTA municipalities
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GTA Municipalities
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ADU Types Built
Free
Site & Zoning Review
Permit
Drawings & Approvals
ADU Types We Build Across the GTA
Garden suites, laneway homes, basement suites and garage conversions - design, permits and construction from one team.
Homeowner Situations We Plan For
Rental income, a family member moving in, or a quiet place to work - the build changes with the reason.
Real Estate InvestorsInvestors adding a income-generating unit to an existing rental property. We start with a…Guest and Visitor SuitesHouseholds that host family for weeks at a time and want the guest room back. A detached…Student and Young-Adult HousingOwners near GTA campuses building compact, durable suites for student tenants. Layouts…Short-Term Rental HostsHosts building a self-contained unit for short-stay guests. Municipal short-term rental…Accessible and Barrier-Free UnitsHouseholds with a wheelchair user or a family member facing mobility loss. We design to…Garage ConversionsOwners of an underused attached or detached garage converting the existing footprint into…Prefab and Modular BuyersOwners who want a shorter on-site build. Modules are fabricated off-site while the…Custom Architect-Led BuildsOwners with a difficult lot or a specific architectural intent, where a catalogue plan…
Why Choose GTA ADU Builders
Design, permits and construction handled by one team, on one contract.
One Team, One Contract
Zoning review, permit drawings and construction under a single agreement - no coordinating separate trades.
Transparent Pricing
A written estimate before drawings begin, with municipal approval costs quoted separately and clearly.
Licensed & Insured
Full liability coverage and WSIB clearance in every GTA municipality we build in.
Approvals Handled
We carry the permit application through committee, conservation and urban design review where required.
Built to the OBC
Frost-depth footings, snow-load-rated roof structure and inspections scheduled to Ontario Building Code Part 9.
Legal Second Unit
Garden suites, laneway homes, basement suites and garage conversions permitted as legal, rentable dwellings.
Customer Stories Coming Soon
We publish reviews only once a project is finished and the homeowner has posted them publicly. The first ones go up as our current builds across the GTA complete.
Serving 30 GTA Municipalities
Every municipality in the Greater Toronto Area, each with its own zoning rules and permit path.
Ready to Get Started?
Get a free, no-obligation quote from GTA ADU Builders - zoning review, permit drawings and construction for ADUs across the GTA.
Frequently Asked Questions
Everything you need to know about our services.
There is no single price, and any builder who quotes one before seeing your lot is guessing. A garden suite budget in Toronto is driven by four things: the finished size of the unit, how much of the servicing has to be trenched from the street or the house, what the soil and grading do to the foundation, and how tight the rear-yard access is for equipment and material. A narrow downtown lot with no laneway and mature trees costs materially more per square foot to build than a wide suburban lot with a side drive, even for the identical unit.
Soft costs - survey, arborist report, drawings, permit fees, engineering - land before a shovel moves and are worth budgeting for separately. We do a paid feasibility and site review first, then issue a fixed-scope price for design, permit and construction so the number you approve is the number you build to.
Related service: Garden Suites
Yes. Toronto permits garden suites city-wide as a form of additional residential unit on the rear portion of a lot that has no abutting laneway - that is the practical difference from a laneway house. Permission is not automatic, though: your lot has to satisfy the by-law tests for lot size, separation from the main house, setbacks, height, angular planes, tree protection and emergency-services access from the street.
Those tests are where most do-it-yourself projects stall, because a plan that looks reasonable on paper can fail on a single dimension and force a redesign or a Committee of Adjustment application. Provincial rules also allow up to three units on most single-family lots, which changes what you can combine on one property. The honest first step is a feasibility review against your actual survey, not a general answer - we run that review before any design work begins.
Related service: Garden Suites
The difference is access, and it decides which by-law applies to your property. A laneway house sits on a lot that backs or flanks onto a public laneway, and the laneway provides the servicing route and the emergency-access frontage. A garden suite is the equivalent unit for a lot with no laneway at all - the rules were written precisely so those properties were not excluded.
Because a garden suite has no rear access, the by-law leans harder on separation distance from the main dwelling, a clear and unobstructed path from the street for firefighters, and how services are run across the yard. Practically, that means garden suites often need more careful siting and can involve more trenching than a comparable laneway build. You do not choose between the two: your lot decides, and a look at your survey and the abutting laneway status settles it in one review.
Related service: Garden Suites
A garden suite delivers two kinds of value, and they behave differently. The first is income: a legal, self-contained unit produces rent every month, and in the GTA a second unit is usually the fastest way to make an existing lot pay. The second is resale, where the unit is valued as permanent, permitted floor area with its own kitchen, bathroom and entrance - appraisers treat a closed-permit legal suite very differently from an unpermitted conversion, which is one reason cutting the permit corner is expensive later.
What we will not do is quote you a percentage. Uplift depends on your neighbourhood, the size and finish of the unit, and what comparable properties with second units actually sold for, and any builder promising a fixed return is selling rather than advising. If income is the goal, we size and lay out the unit for the rental market on your street rather than for maximum square footage.
Related service: Garden Suites
Prefabricated and panelised garden suites are available in the GTA, and on the right lot they shorten the on-site build window considerably because the shell arrives largely complete. The catch is that the module is only part of the job. You still need the survey, the zoning review, the permit set stamped for your specific property, the foundation, the trenched water, sanitary and hydro connections, the crane access to lift the unit into a rear yard, and the inspections through to occupancy.
On a tight lot with no laneway and overhead wires, crane access is sometimes the constraint that rules a prefab out entirely. We assess both routes against your site and tell you honestly which one is cheaper and faster for your property - sometimes it is a factory unit, and often on constrained Toronto lots it is a site-built one.
Related service: Garden Suites