How much does it cost to finish a basement in Mississauga?

Personal-use basements in Mississauga typically run $40,000–$70,000 and legal basement apartments (second units) run $50,000–$95,000+, depending on size, layout and finishes. Every GSR project gets a fixed price in writing before work starts.

Do you handle Mississauga permits and inspections?

Yes — completely. We prepare the architectural drawings, submit the permit application to the City of Mississauga, and pass every inspection. For rental units, we also handle Mississauga's second-unit licensing requirements. You never touch a form.

How long does a basement renovation take in Mississauga?

Construction takes roughly 4–10 weeks for personal-use basements and from about 10 weeks for legal second units. Design and permits are a separate stage before construction — typically 1–2 months. Your construction completion date is locked in writing, and if we miss it we pay you $4,000.

Have you built basements in Mississauga before?

Yes — including one of our showcase projects: a 2,000 sq ft Mississauga entertainment basement with a dedicated home theatre, custom bar, pool table area and media wall. We build 20+ basements a year across Mississauga, Brampton and the GTA.

Basement Renovation Mississauga

Built In Mississauga

The Mississauga Basement Everyone Talks About.

Jessi's 2,000 sq ft entertainment basement — a dedicated home theatre with a 123" screen and full soundproofing, a custom quartz bar, a pool table area and a 13-foot media wall. Built by our crew, finished like our own.

Home theatre basement renovation in Mississauga

Mississauga · Home Theatre

The Theatre

123" screen, projector, 7.1 surround and full soundproofing behind the media wall.

Custom basement bar in a Mississauga renovation

Mississauga · Wet Bar

The Bar

Full custom bar with quartz counters and painted MDF cabinetry.

Pool table area in a Mississauga basement renovation

Mississauga · Games Area

The Pool Table

Custom drop-ceiling detail over a dedicated games area.

Custom media wall in a Mississauga basement

Mississauga · Media Wall

The Media Wall

13 feet wide, 80" TV, shiplap backing and surround sound — with hidden flush doors.

Watch the full video tour of this project →

The GSR Guarantee

On Time. On Budget. Or We Pay You $4,000.

Before we break a single wall, your fixed price and completion date are locked into your contract. If we finish late or go over budget — we pay you $4,000.

Fixed-price contract Fixed completion date $4,000 if we miss 3-year workmanship warranty Permits & inspections handled WSIB insured & licensed

What We Build In Mississauga

Two Ways To Use Your Basement.

Custom & Personal-Use Basements

Home theatres, wet bars, gyms, media walls and open-concept family spaces — like Jessi's showcase above. Designed around how your family actually lives.

Typically $40,000 – $70,000+

Explore custom basements →

Legal Basement Apartments (Second Units)

Turn unused square footage into $1,500–$2,000/month of rental income. Drawings, City of Mississauga permits, egress, fire separation and second-unit licensing — all handled.

Typically $50,000 – $95,000+

Learn about legal second units →

Want the numbers first? Read: What it costs to finish a basement in Mississauga (2026)

How It Works

First Call To Final Walkthrough.

Phone Consultation

Your vision, the scope, and rough pricing — so you know where you stand before anyone visits your home.

Site Visit & Space Planning

We measure your actual basement and plan the layout around it — not a guess.

Design & Permits

Custom floor plan plus the full City of Mississauga permit application — typically 1–2 months. Built to Ontario Building Code, every inspection passed.

Build & Finish

Licensed trades handle the rough-in; our in-house crew handles every finish. Construction runs 4–10 weeks — with your completion date guaranteed in writing.

Mississauga Questions, Straight Answers

Basement Renovation In Mississauga — FAQ.

Personal-use basements typically run $40,000–$70,000, and legal basement apartments run $50,000–$95,000+ depending on size, layout and finishes. You get a fixed price in writing before any work starts. Full breakdown: Mississauga basement cost guide.

Yes — completely. Architectural drawings, permit submission and every city inspection. For rental units we also handle Mississauga's second-unit licensing. You never touch a form.

Construction: roughly 4–10 weeks for personal-use basements; legal second units start around 10 weeks. Design & permits come first — typically 1–2 months. We lock your construction completion date in writing — miss it and we pay you $4,000.

That's our specialty — our Mississauga showcase includes a full dedicated theatre with a 123" screen, projector, 7.1 surround and soundproofing. See home theatre basements for what goes into one.

Yes — through our partner Financeit you can spread the cost into monthly payments (basements from about $550/month, subject to approval). Details on our financing page.

Ready To See What Your Mississauga Basement Could Be?

Get a free quote — a real conversation about your space, your budget and your timeline. No pressure, no obligation.

Or call/text (437) 991-4916