Estimating Assistant

Company: Van Diest Bros
Location: Los Angeles
Posted on: February 21, 2026

Job Description:

Job Description Job Description About Van Diest Bros, Inc Van Diest Bros., Inc. is a family-owned underground utility contractor based in Paramount, California. Established in 1932, we’ve built a long-standing reputation for quality, reliability, and craftsmanship across Southern California. We specialize in wet utilities — including storm drain treatment and retention systems, fire and domestic water services, and sewer construction — along with repairs and system upgrades. Serving general contractors, municipalities, and private developers throughout Los Angeles, Orange, Riverside, and San Bernardino counties, we’re proud to continue a family legacy dedicated to building the infrastructure that supports our communities. Position Summary – Estimating Assistant The Estimating Assistant helps prepare accurate and competitive estimates for wet utility projects including underground water, sewer, and storm drain systems. This position is designed for individuals seeking to build a career in construction estimating by learning the fundamentals of on-screen takeoff, bid preparation, and preconstruction management under the guidance of experienced estimators and project managers. Key Responsibilities Review drawings, specifications, and addenda to identify relevant scope and project viability. Complete takeoffs for wet utility projects (sewer, storm drain, domestic/fire water, reclaimed water, etc.) using PlanSwift and zzTakeoff. Manage RFQs for quoted items such as concrete structures, valves, and appurtenances. Request and manage subcontractor proposals as required by project scope. Assist with pricing takeoffs in HCSS HeavyBid and assembling bid proposals. Assist with maintaining and updating VDB’s pricing database, which includes labor values, assemblies, unit pricing, and historical cost records. Complete site visits as required to understand field conditions, access constraints, and tie-in requirements. Support the team in maintaining bid calendars, pre-bid logs, and proposal documentation. Continue to take on more estimating responsibilities as needed. The Estimating Assistant must be highly motivated to develop the skills and experience necessary to become a successful Junior Estimator. Qualifications A strong interest in Construction Management is required. The Estimating Assistant must be highly motivated to learn and grow within the Construction industry. 0–2 years of experience of relevant field experience and / or office experience as a Project Engineer is highly desirable. Excellent communication skills (both verbal and written). Must be comfortable talking with clients via email, phone and in-person at job walks and other events. Basic understanding of civil plans, specifications, and other related construction documents. Strong math, analytical, and organizational skills. Must have strong computer skills. Must be proficient with Microsoft Excel and Bluebeam. Exposure to PlanSwift, HCSS, and other construction estimating software or similar software is a plus. Associate’s or bachelor’s degree in Construction Management, Civil Engineering, or a related field is preferred. Company Description Van Diest Bros., Inc. is a family-owned underground utility contractor based in Paramount, California. Established in 1932, we’ve built a long-standing reputation for quality, reliability, and craftsmanship across Southern California. We specialize in wet utilities—including storm drain treatment and retention systems, fire and domestic water services, and sewer construction—along with repairs, system upgrades, and design-build estimating. Serving general contractors, municipalities, and private developers throughout Los Angeles, Orange, Riverside, and San Bernardino counties, we’re proud to continue a family legacy dedicated to building the infrastructure that supports our communities. Company Description Van Diest Bros., Inc. is a family-owned underground utility contractor based in Paramount, California. Established in 1932, we’ve built a long-standing reputation for quality, reliability, and craftsmanship across Southern California.\r\n\r\nWe specialize in wet utilities—including storm drain treatment and retention systems, fire and domestic water services, and sewer construction—along with repairs, system upgrades, and design-build estimating.\r\n\r\nServing general contractors, municipalities, and private developers throughout Los Angeles, Orange, Riverside, and San Bernardino counties, we’re proud to continue a family legacy dedicated to building the infrastructure that supports our communities.

Keywords: Van Diest Bros, Rancho Santa Margarita , Estimating Assistant, Construction , Los Angeles, California