Cowan John L Ltd is a general contractor serving Dunnville, Ontario. You can reach them at +1 905-774-5751. View their full profile on ProScore for verified reviews and credentials.

Business Details

110 Brookfield Blvd, Dunnville, ON N1A 2Y4

General Contractor

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Services Offered

Home renovationsAdditionsNew constructionProject managementPermit acquisitionDesign-build

Services & Info

Accessibility

Wheelchair-accessible parking lot

Credentials

Insurance

Not Confirmed

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Homeowner Guides

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Data Transparency

Sources: Google
Score computed: September 19, 2026

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What is the ProScore?

The ProScore aggregates ratings from multiple review platforms into a single score from 0 to 100. Unlike platforms that show only their own reviews, the ProScore gives you the complete picture. Scores are capped for providers with limited source verification.

≥81

Elite

≥70

Trusted

≥54

Good

≥30

Basic

<30

Caution

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ProScore profiles are built from publicly available information and official public registries, and scored using ProScore’s own methodology. We check this data against third-party sources and work to keep it accurate, but records change and errors can occur. A ProScore is informational only — it is not a guarantee, endorsement, or recommendation. Before hiring any contractor, you should independently verify and confirm all relevant credentials, licences, insurance (including WSIB coverage) and references directly with the contractor and the issuing authority. If something here looks wrong, let us know and we’ll correct it promptly.