Jefferson County, CO Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Lot-coverage percentage
- None set by county
- Density controlled by
- Min lot size + setbacks
- R-1 single-family min
- 12,500 square feet
- R-1B/R-1C min
- 9,000 square feet
- R-2 single-family min
- 7,500 square feet
Summary
Jefferson County residential districts do not set a maximum lot-coverage percentage. Instead, minimum lot size plus setbacks and height control how much you can build. R-1 requires 12,500 s.f. for a single-family dwelling; R-1B is 9,000 s.f.; R-2 is 7,500 s.f. (4,500 for two-family).
Lot Size — Single-Family Dwelling: R-1 and R-1A: 12,500 s.f.; R-1B and R-1C: 9,000 s.f.; R-2: 7,500 s.f.; and 4,500 s.f. two-family / multi-family minimums.
Full Breakdown
Rather than a lot-coverage ratio, Section 30 regulates density through minimum lot area combined with the setback and height tables. Single-family minimum lot sizes include 12,500 square feet in R-1/R-1A, 9,000 square feet in R-1B/R-1C, and 7,500 square feet in R-2, with smaller minimums for two-family and multi-family development. The buildable footprint is effectively the lot minus required front, side and rear setbacks, so no separate coverage percentage is imposed at the county level. Your city may apply a coverage ratio instead.
Violations & Fines
Subdividing below minimum lot area or building without meeting lot-standard requirements is a zoning violation; plats and permits are checked against these minimums.
Frequently Asked Questions
What percentage of my lot can I cover?
What is the minimum lot size in R-1?
Sources & Official References
Other rules in Jefferson County
Compare Jefferson County to another location·View the Colorado building setbacks & zoning overview
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