Underdown Trenching Inc

Excavation contractor in Fenton, MO 63026

About this company

Underdown Trenching Inc is listed as an excavation contractor based in Fenton, Missouri, in St. Louis County. Federal motor carrier records list 39 drivers and 102 trucks for the company. It is one of 3 excavation and demolition companies in ZIP 63026.

Other excavation and demolition companies nearby

Atlas Foundation Solutions2451 N Lark Dr, Fenton

(636) 677-7400

Fleet size

Drivers39

Trucks102

Last federal filing: Oct 2025. Source: FMCSA.

Strong market, crowded fieldArea profitability for excavation and demolition in ZIP 63026

Housing demand76

Sales pace, new listings and new construction. Source: Zillow

Customer spending power71

Household income and home values

Room for another company29

More crowded than 71% of US ZIPs

Scored against every US ZIP. An index of local conditions, not this company's results.

County context

One of 32 excavation and demolition companies in St. Louis County, MO.

760 general contractors in St. Louis County, MO.

All 1,840 construction companies in St. Louis County, MO.

ZIP 63026 at a glance

Population: 45,354 (692 per sq mi)
Median age: 42
Households: Median income $97,553 · 48% earn six figures
Housing: 80% owner-occupied
Workforce: 66% labor-force participation · 2.3% unemployment

ZIP figures are US Census estimates for the ZIP area, not the company.

Housing market around ZIP 63026

Figures describe the local area, not this company.

Typical home value$352,000+4.2% past year · +60% in 10 years

Typical rent$1,539+3.8% past year

12-month value outlook+2.3%

New homes permitted, 2025957St. Louis County

Days to sale agreement11St. Louis metro · 8 a year ago

Listings with a price cut29.2%St. Louis metro

Sale price vs list100.1%St. Louis metro

New construction sales128St. Louis metro, Aug · −14% from last year

Source: Zillow (home values, rent, outlook and metro sales), data through Sep 2026. Permits: U.S. Census Bureau.

Typical home value, last 10 years

Source: Zillow Home Value Index, Sep 2026.

Local building angle: St. Louis County permitted 957 new homes in 2025, including 456 apartment units. 23% of the homes in this ZIP were built since 2000.

Local figures are estimates from public records and Zillow housing data, updated regularly.