Zoning, building permits and septic rules in Town of Millsboro, Delaware
Town of Millsboro is a town in Sussex County, Delaware. Town of Millsboro adopts its own zoning, so inside its limits Town of Millsboro’s rules apply, not the county’s. 7 rules below are quoted from official sources and independently re-checked, most recently on October 22, 2026. Rules for unincorporated land are on the Sussex County page.
Answers from the rulebook for Town of Millsboro
Town of Millsboro’s own rules
Local zoningPresent (with conditions)
Land inside the incorporated limits of Millsboro town, Sussex County, Delaware (Town Zoning Ordinance, Chapter 210)
Applies only to the incorporated territory of the Town, per the code's applicability section.
Under § 210-5(a), all uses not expressly permitted in the chapter are prohibited; the chapter also expressly bars marijuana establishments and smoking or consumption lounges in all districts.
Amendment history on § 210-5 is bracketed as 2-2-2009 and 11-6-2023; no effective date was stated for this claim.
“this chapter shall apply to the incorporated territory of the town of millsboro, sussex county, delaware.”
Zoning districtsPartial
Zoning districts inside Millsboro town
The code lists 12 districts by abbreviation: MR, HR, MH, UB, C, HC, LI, RPC, PC, OS, WP and TND.
Boundaries are set on a zoning map dated July 1973; the code states the current zoning map is kept in the Town offices, so the map itself is not published on the code page.
“for the purpose of this chapter, the town of millsboro is hereby divided into zoning districts as follows:”
Minimum lot sizeDistrict specific (with conditions)
Medium-Density Residential (MR) district inside Millsboro town (the main single-family residential district)
Applies to all uses in the MR district except the exceptions in subsection e(2): golf courses, schools, government buildings and agricultural uses; and churches and community centers.
Cluster development is governed by § 210-56 and may use different lot sizes; that section was not opened.
Subsection e(1) carries amendment brackets 12-2-2002, 1-6-2003 and 11-7-2022; the text quoted is the current printed text.
minimum lot area: >= 13000 square feet (exempt uses listed in subsection e(2) of the MR district) · minimum lot frontage: >= 100 feet · minimum lot depth: >= 130 feet
“minimum lot area 13,000 square feet lot frontage 100 feet lot depth 130 feet”
Lot coverageDistrict specific (with conditions)
Medium-Density Residential (MR) district inside Millsboro town
Coverage includes the principal building and all accessory buildings.
Cluster development under § 210-56 may change coverage; not opened.
maximum lot coverage (principal plus accessory buildings): <= 60 percent of lot
“maximum coverage of the lot, including the principal building and all accessory buildings 60%”
Building heightDistrict specific (with conditions)
Medium-Density Residential (MR) district inside Millsboro town
Height is subject to exceptions in § 210-55, which was not opened.
maximum building height: <= 35 feet (except as outlined in § 210-55)
“no building shall exceed 35 feet in height, except as outlined in § 210-55.”
Manufactured homesLimited
Mobile home parks in the Mobile Home Park (MH) district inside Millsboro town. No Town source was located for manufactured homes on individual lots in other districts.
The MH district's principal permitted use is a mobile home park, which the code describes as an extension of the existing mobile home park in town.
Mobile home parks may not exceed five dwelling units per acre and require a minimum tract of five acres.
The MR farm-worker housing accessory use must not be a mobile home, tent or trailer (MR subsection c(1)(c)).
The mobile home park district's remaining dimensional and yard rules were not fully captured.
minimum tract size: >= 5 acres · maximum density: <= 5 dwelling units per acre
“mobile home parks shall not exceed a density of five dwelling units per acre. minimum tract size shall be five acres.”
Subdividing landRegulated (with conditions)
Land divisions inside Millsboro town under the Town's subdivision chapter
Only the existence and title of Chapter 178 (Subdivision of Land, §§ 178-1 to 178-20) were confirmed from the table of contents; its procedures, thresholds and exemptions were not opened.
“chapter 178 subdivision of land (§ 178-1 – § 178-20)”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission; ask Town of Millsboro or Sussex County directly.
Building permit — Building permit for new residential construction inside Millsboro town
Owner-builder exemption — Owner-builder exemption for a homeowner building their own home inside Millsboro town
Building code adopted — Building code adopted for construction inside Millsboro town
Inspections — Building inspections for new residential construction inside Millsboro town
Certificate of occupancy — Certificate of occupancy for a new home inside Millsboro town
17 more unanswered
Minimum dwelling size
Living in an RV
Camping on your land
Tiny homes
Accessory dwellings
Who permits septic
Septic permit
Septic inspection
Off-grid sanitation
Well permit
Mandatory utility hookup
Agricultural exemption
Driveway access
Building in a floodplain
Short-term rentals
Permit fees
Permit process
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 Town of Millsboro publishes no rule on the point, not that none exists. Sussex County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Millsboro means bringing your own water and power. The kit we’d start with:
