Legal basement suite in St. Thomas
20 basement renovation projects submitted this week in St. Thomas

Basement Renovation
St. Thomas

Compare prices for basement renovation in St. Thomas. Our certified contractors transform unfinished basements into income-generating suites — best value.

$22000
starting from

Estimated prices for St. Thomas — free quotes from verified contractors

Licensed & Insured Contractors
100% Free Quote
Waterproofing Expertise

100% Free — No Obligation

Your basement renovation in St. Thomas

3 to 5 quotes · Local renovation experts · Response within 24h

Get My Free Basement Quotes

Free · No obligation · Response within 24h

24h
Max response
100%
Free
5
Quotes

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

Licensed & Insured Contractors

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

100% Free Quote

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

Waterproofing Expertise

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

Code-Compliant Builds

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

Basement renovation services available in St. Thomas

Underpinning

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

Basement Bathroom

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

Basement Finishing

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

Basement Waterproofing

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

Home Theatre & Media Room

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

Legal Basement Suite

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

Frequently asked questions — Basement renovation in St. Thomas

How much does it cost to finish a basement in St. Thomas?
A full basement finish in St. Thomas typically costs $25895–$82864, depending on size, bathroom inclusion and finish level. A basic finish with no bathroom starts around $4143–$12429. Get 3–5 free quotes to compare.
How much does a legal basement suite cost in St. Thomas?
A legal basement suite in St. Thomas typically costs $12429–$41432, including permits, egress windows, kitchen, bathroom and separate entrance. Rental income of $1,500–$2,500+/month is common in larger St. Thomas markets.
Do I need a permit to finish my basement in St. Thomas?
Yes — basement finishing that includes electrical, plumbing or structural work requires permits in St. Thomas. 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. Thomas: 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. Thomas?
A full basement finish in St. Thomas 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.

Have more questions? Our pros are available.

Contact a pro now

Basement renovation prices in St. Thomas — 2026

Estimates based on size, scope and finish level

★ POPULAR
🏠

Full Basement Finish

Framing · Drywall · Flooring · Lighting · Bathroom

$25895 – $82864
Get an exact price →
🏡

Legal Basement Suite

Permits · Egress · Kitchen · Bath · Full finish

$12429 – $41432
💧

Waterproofing

Interior/exterior membrane · Sump pump · Drainage

$4143 – $16572

🛁 Basement bathroom addition

$1864 — $7250

☔ Interior waterproofing system

$4143 — $16572

🌡️ Basement heating installation

$1864 — $7250

💡 Egress window installation

$1864 — $7250

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

Ready to renovate your basement in St. Thomas?

Free quote · 24h response · Local licensed contractors

Get My Free Basement Quotes

Free · No obligation · Response within 24h

100%
free
★★★★★
verified pros
24h
max response