Building Permits in Castle Rock, CO
Check permit requirements for home improvement projects in Castle Rock. Select a project type below to see local requirements, estimated fees, and how to apply.
Key Exemptions in Castle Rock
These projects typically don't require a building permit in Castle Rock:
Cosmetic updates do not require a permit.
Small at-grade patio slabs under 120 square feet are typically exempt from building permits per IRC R105.2 (extended via local amendment). The slab must be at-grade (not more than 30 inches above adjacent grade) and not part of an accessible route.
Freestanding decks under 30 inches are exempt.
Replacing an existing driveway in the same footprint with no changes to the curb cut is generally exempt from permit requirements.
Replacing a fixture does not require a permit.
See all rules by selecting a project type below, or use our free lookup tool for a personalized answer.
Get a personalized answer
Our lookup tool asks a few questions about your specific project to give you the most accurate answer.
Check Your Project →Castle Rock Building Department
Nearby Cities in Colorado
Permit Guides
Read our in-depth guides for common home improvement projects: