Looking for a crawl space contractor in St. Helena, CA? Describe your project once and up to five crawl space contractors who work in St. Helena and Napa County get back to you with a quote. It's free and there is no obligation.
St. Helena is home to about 5,257 people (2024 Census Bureau estimate), a shrinking community (−3.2% since 2020). With 1,060 people per sq mi, it is a suburban area. Humid summers and homes built over vented crawl spaces make moisture problems common here.
St. Helena at a glance
- Population (Census Bureau estimate, 2024)
- 5,257 (−3.2% since 2020)
- Rank in California
- 423rd of 482 cities and towns
- Land area
- 5.0 sq mi
- Population density
- 1,060 people per sq mi (suburban)
- Type
- City (St. Helena city)
- Main county
- Napa County
What to check before hiring in St. Helena
- Water first: standing water needs drainage before a vapor barrier.
- Wood damage: ask for a moisture reading and an assessment of joists and sills.
- Humidity control: check what dehumidifier or air supply is included and its maintenance.
- Price drivers: footprint, height, debris removal, drainage and repairs.
Useful official resources
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U.S. Department of Energy: Energy Saver
Official information and guidance.
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EPA: mold
Official information and guidance.
Services available in St. Helena
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Crawl space encapsulation
Heavy vapor barrier on the floor and walls, sealed vents and a dehumidifier or conditioned air.
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Crawl space drainage and joist repair
Drainage, sump pump, joist or support repairs before or with encapsulation.
Frequently asked questions in St. Helena
How much does crawl space encapsulation cost in St. Helena, CA?
It depends on the size of the crawl space, its condition and the equipment. Describe it: contractors who serve St. Helena reply with a quote.
How long does it take?
Often two to four days for a typical house.
Does it need maintenance?
Yes: the dehumidifier and any sump pump need regular checks.
Which crawl space contractors will contact me?
Up to five independent crawl space contractors who serve St. Helena and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.