Mississauga
Headquartered here. Basement finishing, basement apartments, and waterproofing across Port Credit, Streetsville, Lakeview, Erin Mills, Meadowvale, Cooksville, and Churchill Meadows.
Basement renovation in Mississauga →Basement Renovations Near Me — Toronto, Mississauga & the GTA
Looking for a basement renovation contractor near you? Osoba Renos & Design is headquartered in Mississauga and finishes basements daily across Toronto, Etobicoke, Oakville, and the wider GTA. Open-concept layouts, in-law suites, basement apartments, and full waterproofing — completed in three to four weeks with a five-year workmanship warranty and full permit handling.
Where we work
Pick the city closest to you for neighbourhood-specific pricing, permits, and projects.
Toronto
Finished basements, second-suite builds, and waterproofing across the City of Toronto. Full City of Toronto permit handling — drawings, application, plan exam, and inspections.
Basement renovation in Toronto & GTA →Etobicoke
Basement renovations across The Kingsway, Royal York Gardens, Humber Bay Shores, Mimico, Markland Wood, and Princess Anne Manor. About 15–25 minutes from our Mississauga shop.
Basement renovation in Etobicoke →Oakville, Milton & the wider GTA
We have completed basement renovations in Oakville, Milton, Burlington, Vaughan, Thornhill, and Brampton. Send your address for a free in-home estimate.
Get a free in-home estimate →How to choose a basement contractor near you
Five things to verify before you sign anything — applies whether you are in Mississauga, Toronto, Etobicoke, or Oakville.
- 1
Confirm licensing, WSIB, and insurance
Every legitimate basement contractor in Ontario should carry $2M liability insurance and WSIB clearance — and pull electrical (ESA) and plumbing permits where needed. Ask for certificates and verify them before any deposit.
- 2
Ask about permits and inspections
Finished basements require a municipal building permit. A real contractor pulls the permit, prepares drawings, responds to plan exam comments, and coordinates inspections. If a quote skips the permit, it skips the safety review.
- 3
Verify experience with waterproofing
Below-grade rooms in the GTA face moisture, hydrostatic pressure, and temperature swings. Ask how the contractor handles vapour barriers, perimeter drainage, and any past water-incursion history at your address.
- 4
Get an itemised quote
A real quote breaks out framing, drywall, insulation, electrical, plumbing, flooring, painting, and any bathroom/kitchen scope separately — not a single line. Itemised quotes prevent surprise change orders later.
- 5
Confirm timeline and warranty in writing
Basement renovations near you in the GTA typically take 3–4 weeks. Top GTA contractors offer a written workmanship warranty (Osoba: 5 years). Get the start date, expected finish date, and warranty in writing before signing.
For more context, read our deep-dive on how to choose a renovation contractor in Toronto: 7 key questions.
Basement Renovations Near Me — FAQ
How do I find a basement renovation contractor near me in the GTA?▼
Start with three local options: Google Business Profile (look at the map pack), local subreddits and neighbourhood Facebook groups, and the home renovation directories (HomeStars, Houzz, Renomark). Verify licensing, WSIB clearance, and insurance — then ask each for two recent local references with a finished basement you can call about.
What does a basement renovation near me actually cost in the GTA?▼
In 2026, a full basement renovation in Toronto, Mississauga, or Etobicoke typically costs $25,000–$40,000, depending on finishes, flooring, whether a bathroom is added, and any structural or electrical upgrades. Second-suite (basement apartment) builds run higher because of egress, fire-separation, and parking requirements.
How long does a local basement renovation take?▼
Three to four weeks for most full basement renovations in the GTA, assuming the scope is set and the permit is in hand. Permit application and plan exam can add 4–8 weeks on the front end, so plan accordingly.
Do I need a building permit for a basement renovation?▼
Yes — basement finishing requires a municipal building permit, plus electrical (ESA) and plumbing permits when those trades are involved. Ceiling height, egress windows, and fire-separation rules all apply, and second units have additional requirements. We pull all permits as part of every project that requires them.
Ready for a basement renovation near you?
Send us your address and we will confirm whether you are in our service area and book a free in-home estimate.