Stabilization vs. Undercut Calculator for St. Louis Projects

    Compare a conceptual cost range and schedule for treating soft subgrade in place against undercutting and replacing it.

    Conceptual comparison built from public cost data (MoDOT average unit bid prices, EIA diesel, BLS PPI). Final design depends on the geotechnical report and a laboratory mix design. Not a bid or quote.

    Units
    Replacement material
    Spoil disposal
    Season
    Schedule sensitivity

    When stabilization fits

    • Clay and silty soils that react with lime or cement
    • Large building pad and paving areas
    • Wet seasons, when native soils won't dry on their own
    • Tight schedules
    • Long or expensive haul for spoil and import

    When undercut fits

    • Small or isolated soft spots
    • Organic or debris-laden soils that won't react with reagent
    • Very deep unsuitable layers
    • Specifications that require removal

    The geotechnical report and lab mix design make the final call.

    Engineer of record? See our resources for civil & geotechnical engineers.

    Request A Project Bid

    Tell us your scope, schedule, and site address. A real estimator from our O'Fallon office will get back to you within one business day.

    By submitting you agree to be contacted about your project.

    Call for Project Inquiries

    (636) 978-3478

    Monday - Friday: 7am - 4pm

    Visit Our Office

    854 Lone Star Drive

    O'Fallon, MO 63366