Castle Rock, CO Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Minimum lot area (R-1)
- 9,000 square feet
- Minimum lot width
- 75 feet
- Base R-1 coverage cap
- None stated (yard-driven)
- Buildable area set by
- Required yard setbacks
- Code section
- CRMC 17.18.040(A),(B)
Summary
R-1 lots must be at least 9,000 square feet with 75-foot minimum width. Castle Rock controls buildable area chiefly through minimum yard setbacks rather than a fixed lot-coverage percentage; PD and overlay zones may set specific coverage caps.
Development standards for the R-1 District are:
A. Minimum area of lot shall be 9,000-square feet.
B. Minimum width of lot shall be 75-feet.
C. Minimum side yard for residential:
1. Principal buildings, 7-feet.
2. Accessory buildings, 2-feet, where located in the rear one-third of the lot.
3. Accessory buildings, 7-feet, where not located in the rear one-third of the lot.
4. All buildings, 25-feet, where abutting a street.
5. For all other uses, the minimum side yard width shall be the equivalent of 1-foot for each 3-feet or fraction thereof of building height, provided that, for school or church uses, no side yard shall be less than 25-feet wide.
D. Minimum front yard for all buildings shall be 25-feet.
E. Minimum rear yard:
1. Principal buildings, 25-feet.
2. Accessory buildings, 10-feet.
F. Maximum height of buildings:
1. Principal buildings, 35-feet.
2. Accessory buildings, 20-feet.
(Ord. No. 2019-028 , § 2, 9-17-2019)
Full Breakdown
CRMC 17.18.040(A)-(B) requires R-1 lots to have a minimum area of 9,000 square feet and a minimum width of 75 feet. Unlike some towns, base R-1 zoning does not state a single maximum lot-coverage percentage; instead, buildable area is limited by the required front (25 ft), rear (25 ft), and side (7 ft) yards, which must remain open and unobstructed. Planned Development (PD) zones and overlay districts can impose specific building-coverage or floor-area ratios (for example, coverage caps in certain overlays), so confirm your parcel's zoning or PD ordinance for any percentage limit.
Violations & Fines
Exceeding allowed buildable area or encroaching required yards is a zoning violation; the town can deny permits or require correction.
Frequently Asked Questions
What is the max lot coverage in R-1?
How big must an R-1 lot be?
Sources & Official References
Other rules in Castle Rock
Compare Castle Rock to another location·View the Colorado building setbacks & zoning overview
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