Denver, CO Environmental Rules: Erosion Control (2026)

The Denver Zoning Code restricts grade changes on any lot subject to a minimum Primary Street Setback. Re-grading within that setback cannot shift the ground more than 1 foot from its original elevation within 10 feet of the street lot line, and the same 1-foot cap applies inside the required side interior setbacks. Lots that are part of a single-owner or master-developer Face Block are exempt. Larger grade changes are allowed only under specific exceptions, drainage, driveway/parking access, pedestrian ramps, window wells, retaining walls, town house lots, or the rear 35% of lot depth, and the Zoning Administrator can require a certified engineering report before approving one.