Award-winning basement renovation in Toronto & GTA. Licensed contractors, full project management, permit-managed.
aMaximum Construction is recognized as one of the top basement renovation contractors in Toronto & GTA. We transform unfinished or outdated basements into beautiful, functional living spaces — family rooms, home offices, in-law suites, home gyms, and more.
Our full-service approach covers design, framing, electrical, plumbing, insulation, drywall, flooring, and finishing — all permit-managed and delivered on schedule.
Our team has completed hundreds of basement renovations across Toronto & GTA and the GTA. We are fully licensed, insured, and committed to transparent communication from first quote to final walkthrough. Every project is permit-managed and built to Ontario Building Code.
Book a free in-home consultation. We'll assess your space, discuss your goals, and provide a detailed written quote.
BOOK NOWWe are a licensed and insured general contractor serving Toronto and the GTA since 2018.
WSIB clearance, $2M liability insurance, and all permits handled. You are protected from start to finish.
Detailed written quote before any work begins. No hidden fees, no surprise invoices at the end.
We coordinate all trades under one contract. You deal with us — not a dozen different contractors.
Milestone-based schedule with regular updates. We show up when we say we will and finish when we say we will.
Written warranty on all work. We use quality materials and back every job with a workmanship guarantee.
Clean jobsite every day. We treat your home with respect — no mess left behind, no damage to surroundings.
We source quality materials and tools from leading construction retailers across Canada & North America.
Basement renovations in Toronto & GTA range from $30,000–$55,000 for a standard finish to $60,000–$100,000+ for a legal apartment with separate entrance. Key cost drivers include: bathroom addition, ceiling height, waterproofing requirements, and egress windows.
Yes. In Toronto & GTA and across the GTA, finishing a basement requires a building permit. The permit process covers framing, electrical, plumbing, and insulation — all subject to inspection. We manage the permit process and schedule all required inspections.
Ontario Building Code requires a minimum ceiling height of 1.95 metres (6'5") for habitable basement space in Toronto & GTA. If your existing ceiling is lower, options include lowering the floor (underpinning) or creative design around beams and ductwork.
Yes. Ontario Building Code requires egress windows for any basement bedroom — minimum 0.35 m² openable area and no dimension smaller than 380mm. Egress windows are required for legal occupancy and for insurance coverage. We handle the installation as part of our basement renovation service.
To legally rent a basement apartment in Toronto & GTA, it must meet Ontario Building Code requirements: separate entrance, proper ceiling height, egress windows, interconnected smoke and CO detectors, and a second means of egress. We build legal secondary suites that meet all requirements.
Moisture must be addressed before any finishing work begins. We assess the source — whether exterior drainage, foundation cracks, or condensation — and recommend waterproofing solutions. Finishing over a wet basement leads to mould and material failure.
In Toronto & GTA's climate, basement walls should have a minimum of R-20 insulation. We typically use rigid foam board (XPS) against the foundation wall, then batt insulation in the stud wall. This approach prevents thermal bridging and moisture accumulation.
A standard basement finish in Toronto & GTA takes 6–10 weeks from permit approval to final inspection. A legal basement apartment with plumbing, separate entrance, and multiple rooms takes 10–16 weeks. We provide a detailed schedule at the start of every project.
The most popular uses in Toronto & GTA are: legal rental apartment (best ROI), family recreation room, home office, home gym, and guest suite. The right choice depends on your family's needs, budget, and long-term plans for the property.
A well-finished basement in Toronto & GTA typically adds 70–80% of renovation cost in home value, with legal apartments often returning more. In the current Toronto & GTA market, a legal secondary suite can add $80,000–$150,000 to your home's appraised value.
Basement renovation in Toronto & GTA ranges from $25,000–$50,000 for a standard finish and $60,000–$100,000+ for a full in-law suite with kitchen and bathroom. aMaximum Construction provides detailed quotes based on your specific layout and goals.
A standard basement finish in Toronto & GTA takes 6–10 weeks. Projects with in-law suites, bathrooms, or wet bars may take 10–16 weeks. We provide a firm project schedule before work begins.
Yes, with the proper permits and inspections. aMaximum Construction designs and builds legal secondary suites in compliance with Ontario Building Code and local zoning bylaws, maximizing your rental income potential.