Thompson & Sons Waterproofing Inc., Ellicott City MD

About Thompson & Sons Waterproofing Inc.

Thompson & Sons Waterproofing Inc. is listed here as a basement waterproofing and crawl space company serving the Ellicott City area, Maryland.

Its website, thompsonandsonsinc.com, names foundation crack repair, foundation settlement repair, bowing basement wall repair, foundation waterproofing and crawl space encapsulation. The quotes below link to the page where each one appears, so you can check them.

Service area on its website: the Baltimore area.

Google Maps lists it as open 24 hours, every day.

Service-area company. Google Maps doesn't publish a street address for it; it appears in searches around Ellicott City. Ask where it's based and whether it covers your ZIP code.

Foundation services

What Thompson & Sons Waterproofing Inc. says on its website

Foundation crack repairAdditionally, foundation problems can affect your home’s resale value, making foundation crack repair in Baltimore essential for protecting both your property and your investmentthompsonandsonsinc.com
Foundation settlement repairWith years of experience addressing foundation issues in the Baltimore area, we provide customized repair solutions that stabilize your foundation and secure your homethompsonandsonsinc.com
Bowing basement wall repairWithout proper foundation repair in Baltimore, homes are at risk of serious structural problems, including bowing walls, uneven floors, and even water intrusionthompsonandsonsinc.com
Foundation waterproofing#1 Basement Waterproofing in Baltimore MD - Thompson & Sonsthompsonandsonsinc.com
Crawl space encapsulationCrawl Space Encapsulationthompsonandsonsinc.com

Quoted from its website, read in October 2026.

Inspections, warranty and payment

Free estimateContact us today for a free consultation and experience the difference of working with Baltimore's trusted basement waterproofing experts thompsonandsonsinc.com
FinancingCompetitive Pricing and Financing Options thompsonandsonsinc.com

What its website says (October 2026). Ask for the warranty in writing and read what it covers before signing.

Opening hours

Monday	Open 24 hours
Tuesday	Open 24 hours
Wednesday	Open 24 hours
Thursday	Open 24 hours
Friday	Open 24 hours
Saturday	Open 24 hours
Sunday	Open 24 hours

As listed on Google Maps (July 2026). Call before visiting – hours change.

Thompson & Sons Waterproofing Inc. on the map

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Dashed pin = service area, no street address. Other pins: companies within 30 miles. Map data © OpenStreetMap contributors.

Before you call, ask about

Interior drain, exterior membrane or crack injection – and why
Whether a battery backup sump pump is included
What the warranty promises: a dry basement, or only the system
How they'll handle structural cracks or bowing walls, if any

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Repair

Scope (piers, feet of wall, sq ft)Total paid (USD)

Month and yearCity or ZIP (optional)

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Questions about this company

How do I contact Thompson & Sons Waterproofing Inc.?

By phone at (443) 993-5244. Through its website, thompsonandsonsinc.com.

When is Thompson & Sons Waterproofing Inc. open?

Google Maps lists it as open 24 hours, every day.

What foundation services does Thompson & Sons Waterproofing Inc. offer?

On its website it mentions foundation crack repair, foundation settlement repair, bowing basement wall repair, foundation waterproofing and crawl space encapsulation.

Does Thompson & Sons Waterproofing Inc. offer free inspections?

Its website mentions “free consultation”. Ask what the visit includes and whether you'll get the findings in writing.

How much does foundation repair cost in Maryland?

Estimated for Maryland: sealing a crack about $256–$819; repairing a settling foundation about $4,608–$20,480, mostly depending on the number of piers. Try the cost calculator and compare written quotes.

Other foundation companies in Ellicott City

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Levelift Foundations, LLCEllicott City
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Foundation repair near Ellicott City

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Always WaterproofingLinthicum Heights, MD6 mi
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Budget Waterproofing, Inc.Linthicum Heights, MD7 mi
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