LICENSE-VERIFIED DIRECTORY

Verified providers serving the South Shore.

Every company shown here has an active Suffolk County home-improvement license matched to its business identity and relevant waterproofing work. Inclusion is not a recommendation, ranking, or guarantee.

How this directory works:We check the Suffolk County Consumer Affairs registry, match the license to the company identity, and confirm relevant services from the company's own website. Links are tagged so we can measure useful referrals. No company has paid for placement. License status can change, so verify insurance, scope, and references directly before hiring.

Foundation Crack Repair LLC

LICENSE VERIFIED

Sayville, serving Long Island including Suffolk County

Crawl-space servicesFoundation repairWaterproofingStructural reinforcement

The county record matches the business name and published phone and includes Waterproofing and Foundations among its licensed categories.

Verified license: Suffolk County HI-70034 · Expires March 1, 2028

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Source: Suffolk County Consumer Affairs registry and company website · Last checked August 3, 2026 ·Phone published: 631-410-3388

Diamond Masonry & Waterproofing LLC

LICENSE VERIFIED

Suffolk and Nassau counties

WaterproofingMasonrySill platesFoundation work

The county record matches the business identity and published phone and lists Waterproofing as an active licensed category.

Verified license: Suffolk County HI-67081 · Expires July 1, 2028

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Source: Suffolk County Consumer Affairs registry and company website · Last checked August 3, 2026 ·Phone published: 516-307-2507

Healthy Basement Systems LLC

LICENSE VERIFIED

Oakdale and Long Island

EncapsulationSump pumpsDrainageStructural repair

The active county record uses the spelling “Heathy Basement Systems LLC”; its address, phone, and company email domain match the provider.

Verified license: Suffolk County HI-71430 · Expires December 1, 2026

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Source: Suffolk County Consumer Affairs registry and company Oakdale service page · Last checked August 3, 2026 ·Phone published: 631-581-0808

A.M. Shield Waterproofing Corp

LICENSE VERIFIED

Suffolk, Nassau and Queens

Crawl-space protectionFoundation repairDrainageWaterproofing

The county record matches the business name, phone, and company email domain and lists Waterproofing as its active licensed category.

Verified license: Suffolk County H-41333 · Expires November 1, 2026

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Source: Suffolk County Consumer Affairs registry and company website · Last checked August 3, 2026 ·Phone published: 516-294-8400

VERIFICATION QUESTIONS

What “license verified” means here.

How does a provider qualify?

We require an active Suffolk County home-improvement license, an exact or evidence-supported business identity match, a relevant licensed category, and a current company service page.

Does inclusion mean endorsement?

No. Verification confirms public facts, not workmanship, insurance, pricing, availability, or suitability for a home.

How often are records checked?

Each card displays its last verification date and license expiration. Records are rechecked before expiration and when a material correction is reported.