Basement Renovation & Underpinning Toronto
Your basement is the largest untapped space in your home. Whether you want a comfortable family room, a private home office, a legal rental suite, or just more usable living space, a basement renovation is one of the most cost-effective ways to expand what your home can do.
Introduction
Homewrap handles basement renovations and structural underpinning across Toronto and the GTA. We manage both the finishing work and the structural work, with engineering, permits, and all trades handled in-house.
Basement work is technically demanding. Moisture management, proper drainage, fire separation for legal suites, and foundation work all require experience and careful planning. We bring an engineering background to every basement project, which means the structural decisions are made correctly from the start.
What Our Basement Renovations Include
Framing, insulation, drywall, flooring, lighting, and all interior finishes. We build out defined rooms (bedrooms, bathrooms, home offices, rec rooms) or open-concept living areas depending on your goals.
Underpinning is a structural process that lowers the basement floor by excavating below the existing foundation and pouring new concrete footings at a greater depth. It requires engineering, permits, and careful sequencing to protect the existing structure throughout the process.
Interior waterproofing membranes, weeping tile, sump pumps, backwater valves, and proper grading around the foundation. We address moisture at the source so the finished space stays dry over the long term.
Converting your basement into a legal rental unit with its own kitchen, bathroom, separate entrance, fire separation, and all required inspections. Legal suites in Toronto must meet specific building code requirements, and we manage the permit and approval process as part of the project scope.
Adding a bathroom or kitchen below grade involves cutting and re-pouring concrete for drain lines, running new water supply lines, and coordinating with HVAC for proper ventilation. We manage all of this as part of the basement scope.
Types of Basement Projects We Handle
If your basement already has adequate ceiling height (7 feet or more), we can finish the space without any structural work. Framing, insulation, drywall, flooring, electrical, and all interior finishes to transform an unfinished basement into livable space.
Many older homes in Toronto, especially in North York, Scarborough, and Etobicoke, have basements with ceilings under 7 feet. Underpinning lowers the slab to create proper headroom, and is combined with a full finish to deliver a livable, high-quality space.
A code-compliant rental suite with a separate entrance, kitchen, bathroom, fire separation, smoke and CO detection, and egress windows. Legal suites in Toronto require a building permit and must meet specific requirements under the Ontario Building Code.
When the basement is part of a larger renovation that includes the main floor or upper level, we coordinate the full scope and sequence. The basement doesn't get treated as a separate project — it moves with the rest of the house.
Basement Renovation Cost in Toronto
Basement renovation costs in Toronto depend on whether structural work is involved, the level of finishes, and whether you're creating a legal suite.
A basic basement finish (rec room, no bathroom, standard finishes) generally runs $35,000 to $50,000 for a 1,000 square foot space. A mid-range renovation with a bathroom, home office, and quality finishes typically falls between $55,000 and $80,000. A legal basement apartment with a separate entrance, kitchen, and all required code compliance runs $80,000 to $130,000+.
Underpinning alone typically costs $35,000 to $85,000 depending on the size of the basement, depth of lowering, soil conditions, and access. When combined with a full finish, total project costs often run $120,000 to $200,000+.
We recommend a 10 to 15% contingency on any basement project. Older Toronto homes frequently reveal moisture issues, outdated wiring, and substandard previous work once demolition begins.
How We Manage Your Basement Renovation
Basement projects range from straightforward finishing work to complex structural underpinning combined with legal suite conversions. The process scales to the scope.
We inspect the existing basement, assess ceiling height, check for moisture, evaluate the foundation, and discuss your goals. You get a clear picture of what's involved and what to expect before any commitments are made.
Our team prepares the layout, structural engineering (if underpinning is involved), and all documentation for the building permit application.
We submit all permit applications and manage the review and inspection process. Underpinning and legal suite conversions both require permits, and we handle that as a standard part of the project.
Structural work first (underpinning, waterproofing), then framing, electrical, plumbing, HVAC, insulation, drywall, flooring, and all finishes. A dedicated project lead manages the entire sequence.
We review the finished space with you in detail, confirm all inspections are complete, and hand over a space that's fully finished and backed by warranty coverage.
Why Homeowners Choose Homewrap
Basement Renovations Across the GTA
We take on basement renovation and underpinning projects across Toronto and the Greater Toronto Area, including North York, Scarborough, Etobicoke, East York, Vaughan, Richmond Hill, Markham, Mississauga, Aurora, Newmarket, Oakville, Pickering, and surrounding communities.
