Denver, CO
FOUNDATIONS ESTIMATING.
QUICK ANSWERS.
Do I need a geotechnical report to pull a foundation permit in Denver?
Not always, but Denver Building and Fire Code inspectors can require a soils letter from a licensed geotechnical engineer on sites with known expansive or unstable soils — particularly in older neighborhoods and hillside lots. Budget $800–$1,500 for a standard geotechnical letter and include it as a line item or owner-furnished scope in your bid so there are no surprises at permit submittal.
Is radon rough-in required on new foundation pours in Denver?
Denver County and most surrounding jurisdictions in the metro are EPA Radon Zone 1. The 2021 IRC Appendix F (radon control) is adopted by many Front Range jurisdictions, and inspectors in Denver, Aurora, and Lakewood routinely require passive radon rough-in — sub-slab polyethylene, 4-inch PVC riser, and a future-fan junction box — as part of new residential foundation work. Confirm with the specific AHJ at permit pre-application, and include the rough-in in your base scope rather than pricing it as an alternate.
LOCAL FACTS.
Approximately $38–$52/hr for journeyman foundation laborers in the Denver-Aurora MSA as of 2024, reflecting Colorado's construction labor market tightness and prevailing wage pressure from public projects along the Front Range.
Denver Community Planning and Development charges plan review plus permit fees based on valuation; a $60,000–$80,000 foundation-only project typically generates $800–$1,400 in combined permit and plan review fees. Structural permits for expansive soil sites often require a soils report, adding $500–$1,500 in third-party geotechnical costs before permit issuance.
36 inches below finished grade per the 2021 IRC as adopted by Colorado (IRC Table R301.2(1) local amendment). This is deeper than most Sun Belt markets and directly increases footing concrete volume and excavation depth on every job.
The Colorado Geological Survey classifies large portions of the Denver metropolitan area — including areas of Jefferson, Arapahoe, and Douglas counties — as high-risk for expansive soil movement. Insurance claims related to foundation damage from expansive soils rank among the costliest property damage categories in Colorado, making accurate soil-condition line items in bids a liability issue, not just a pricing issue.
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