DDL & Co. Chartered Professional Accountants
- Strategic
- Expertise
- Service
24 firms listed · 9 in St. Catharines · 17 rated 4.5+
Data verified October 16, 2026
The 24 firms listed for St. Catharines, ON provide designated accounting and assurance services. What each says about its designation and engagement types comes from its own website; ratings and quotes come from public reviews.

9 of the 24 firms we list are based in St. Catharines; the other 15 serve St. Catharines from towns including Oakville (47 km), Fonthill (16 km) and Beamsville (21 km). 20 of the firms on this page have a rating, from 4.2 to 5.0 across 981 reviews; 6 have 50 or more reviews and 17 are rated 4.5 or higher. When clients rate these firms on specific qualities, they most often praise professionalism (94%), responsiveness (90%) and quality (66%). The topics that come up most in reviews of the firms on this page are "expertise" and "knowledge". 6 have ten or more years of experience, the longest 30 years. 1 offers payment plans; 4 offer a free initial consultation and 1 is family- or locally-owned. We have a website on file for 21 of the firms on this page; 20 publish a contact page; 18 list a public email and 2 take bookings online. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book a consultation.
9 of the 24 firms sit in St. Catharines itself. The others come from other towns within 55 km. For assurance engagements the relevant questions are licensing and industry rather than distance. Distances are straight-line.