Legal basement suite in St. Marys
8 basement renovation projects submitted this week in St. Marys

Basement Renovation
St. Marys

An unused basement in St. Marys is lost living space. Our local specialists design and build basements that add value. No-cost estimate within one business day.

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Basement renovation services available in St. Marys

Basement Finishing

Full basement finishing in St. Marys — framing, insulation, drywall, flooring, lighting and trim. Turn unused space into living space.

Legal Basement Suite

Complete legal basement suite construction in St. Marys. Permits, egress, kitchen, bathroom, separate entrance — income-ready.

Basement Bathroom

New bathroom addition in your basement. Full plumbing rough-in, tile, fixtures and ventilation.

Underpinning

Basement underpinning to increase ceiling height in St. Marys. Structural engineering and permit included.

Home Theatre & Media Room

Custom home theatre and media room design and installation. Wiring, acoustics and custom millwork in St. Marys.

Basement Waterproofing

Interior and exterior waterproofing systems. Sump pumps, drainage membranes, crack injection in St. Marys.

Why choose Basement Quotes Canada for your basement renovation in St. Marys?

Licensed & Insured Contractors

Every renovation partner is fully licensed, carries liability insurance, and has verified references in St. Marys.

100% Free Quote

No fees, no obligation. Compare up to 5 basement renovation quotes in St. Marys — completely free.

Waterproofing Expertise

Proper waterproofing is critical before finishing a basement. Our contractors in St. Marys assess and correct moisture issues first.

Code-Compliant Builds

All basement renovations — including legal suites — are built to code with proper permits in St. Marys.

Basement renovation prices in St. Marys — 2026

Estimates based on size, scope and finish level

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Full Basement Finish

Framing · Drywall · Flooring · Lighting · Bathroom

$21173 – $67370
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Legal Basement Suite

Permits · Egress · Kitchen · Bath · Full finish

$9624 – $33685
💧

Waterproofing

Interior/exterior membrane · Sump pump · Drainage

$3368 – $13474

🛁 Basement bathroom addition

$1443 — $5774

☔ Interior waterproofing system

$3368 — $13474

🌡️ Basement heating installation

$1443 — $5774

💡 Egress window installation

$1443 — $5774

Estimated prices for St. Marys. Get accurate, free quotes from our verified contractors.

Frequently asked questions — Basement renovation in St. Marys

How much does it cost to finish a basement in St. Marys?
A full basement finish in St. Marys typically costs $21173–$67370, depending on size, bathroom inclusion and finish level. A basic finish with no bathroom starts around $3368–$9624. Get 3–5 free quotes to compare.
How much does a legal basement suite cost in St. Marys?
A legal basement suite in St. Marys typically costs $9624–$33685, including permits, egress windows, kitchen, bathroom and separate entrance. Rental income of $1,500–$2,500+/month is common in larger St. Marys markets.
Do I need a permit to finish my basement in St. Marys?
Yes — basement finishing that includes electrical, plumbing or structural work requires permits in St. Marys. Legal suites require additional permits and inspections. Your contractor handles the permitting process.
How do I know if my basement has a moisture problem?
Signs of basement moisture in St. Marys: water stains, efflorescence (white powder on walls), musty odour, peeling paint, or visible mold. Our contractors assess moisture before any finishing work to prevent future damage.
How long does a basement renovation take in St. Marys?
A full basement finish in St. Marys takes 4–8 weeks. A legal suite with plumbing and permitting takes 8–14 weeks. Underpinning adds 2–4 weeks. Your contractor will provide a detailed schedule.

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