Looking for a crawl space contractor in Weldon Spring, MO? Describe your project once and up to five crawl space contractors who work in Weldon Spring and St. Charles County get back to you with a quote. It's free and there is no obligation.
Weldon Spring is home to about 5,304 people (2024 Census Bureau estimate), a stable community (−0.5% since 2020). With 694 people per sq mi, it is a semi-rural area. Humid summers and homes built over vented crawl spaces make moisture problems common here.
Weldon Spring at a glance
- Population (Census Bureau estimate, 2024)
- 5,304 (−0.5% since 2020)
- Rank in Missouri
- 130th of 938 cities and towns
- Land area
- 7.6 sq mi
- Population density
- 694 people per sq mi (semi-rural)
- Type
- City (Weldon Spring city)
- Main county
- St. Charles County
What to check before hiring in Weldon Spring
- 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 Weldon Spring
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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 Weldon Spring
How much does crawl space encapsulation cost in Weldon Spring, MO?
It depends on the size of the crawl space, its condition and the equipment. Describe it: contractors who serve Weldon Spring 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 Weldon Spring 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.