Ritchie's Insulation & General Contracting
- Company
- Efficient
- Attic
24 companies listed · 12 in St. Thomas · 2 open 24/7 · 9 open weekends · 18 rated 4.5+
Data verified October 21, 2026
Listed for homeowners in and around St. Thomas, ON, these 24 companies take on multi-trade work, from a basement build-out to a full renovation. What each one says about licensing, hours and the work it takes on comes from its own website; ratings and quotes come from public reviews.

Of the 24 companies we list here, 12 are in St. Thomas itself and 12 come from London (10, 24 km), Port Stanley (1, 11 km) and Aylmer (1, 17 km). 23 of the companies on this page have a rating, from 3.7 to 5.0 across 886 reviews; 5 have 50 or more reviews and 18 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (86%) and responsiveness (77%). The topics that come up most in reviews of the companies on this page are "estimates" and "price". 2 are open around the clock; 9 are open on Saturdays and 2 on Sundays. Domain records put 9 websites of the companies on this page at ten or more years old; the oldest dates from 1997. 3 offer emergency call-outs; 2 offer financing or payment plans; 7 give free estimates and 5 are family- or locally-owned. We have a website on file for 23 of the companies on this page; 19 publish a contact page and 19 list a public email. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Only 12 of the 24 companies here are based in St. Thomas. The rest come from other towns within 30 km. Crews travel to the work, so the office address matters less than whether they will send the same people every morning and what travel time does to the price.