Zoning, building permits and septic rules in Littleton, Colorado
Littleton is a city in Arapahoe County, Colorado. Littleton adopts its own zoning, so inside its limits Littleton’s rules apply, not the county’s. 4 rules below are quoted from official sources and independently re-checked, most recently on November 1, 2026. Rules for unincorporated land are on the Arapahoe County page.
Answers from the rulebook for Littleton
Littleton’s own rules
Building code adoptedAdopted
Construction inside Littleton city limits, under the city's Building Division
The page lists the adopted code editions (2024 IBC, 2024 IECC, 2024 IEBC, 2024 IFGC, 2024 IMC, 2024 IPC, 2024 IPMC, 2024 IRC, 2024 ISPSC, 2024 IWUIC, ICC A117.1-2017, 2026 NEC) and says they are adopted by the city; the page does not give an adoption ordinance date.
Local amendments to the IRC and IBC exist per the same page's amendment list, which was not read in full.
“the building division is responsible for: administering and enforcing the adopted international codes, national electric code, and city ordinances”
InspectionsRequired
Construction work inside Littleton city limits that is under a city building permit
Inspections are required in each phase of the work; the city's inspection requirements for a given project were not read in full (which inspections apply to a given permit is not stated on this page).
Which work requires a building permit, and therefore inspections, is not confirmed by this page.
“before you begin each new phase, you must have an approval on all required inspections for the portion of the work recently completed.”
Local zoningPresent (with conditions)
Land inside Littleton city limits (city of Littleton, 2255 W. Berry Avenue site). Littleton city adopts and administers its own zoning ordinance, the Unified Land Use Code (ULUC).
Zoning districts, permitted uses and development standards are set by the city council ordinances and apply inside city limits only; the county does not administer this zoning inside the city.
“zoning is a series of ordinances adopted by the city council which set standards for the location, size of buildings, and for use of buildings and land throughout the city.”
Zoning districtsPublished
Zone districts inside Littleton city limits
The portal links to a land use matrix describing allowed uses by zone district and a current zoning map (2026 PDF); the district list itself was not read.
“zoning maps & tables land use matrix (describes the allowed uses in each zone district – opens in new tab)”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission; ask Littleton or Arapahoe County directly.
Building permit — Whether a building permit is required for a new home or other work inside Littleton city limits
Owner-builder exemption — Owner-builder permit exemption inside Littleton city limits
Certificate of occupancy — Certificate of occupancy for a new home inside Littleton city limits
Minimum dwelling size — Minimum dwelling size, main single-family residential district inside Littleton city limits
Minimum lot size — Minimum lot size, main single-family residential district inside Littleton city limits
20 more unanswered
Setbacks
Lot coverage
Building height
Living in an RV
Camping on your land
Tiny homes
Manufactured homes
Accessory dwellings
Who permits septic
Septic permit
Septic inspection
Off-grid sanitation
Well permit
Mandatory utility hookup
Agricultural exemption
Subdividing land
Driveway access
Building in a floodplain
Short-term rentals
Permit fees
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Littleton publishes no rule on the point, not that none exists. Arapahoe County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Littleton means bringing your own water and power. The kit we’d start with:
