Dade County, Missouri requires no residential building permit, and the county's own site shows no zoning department or ordinance for unincorporated land12. Septic is different and long-standing: every on-site sewage disposal system in Dade County has needed a "permit to construct" since 1996, issued by the Dade County Health Department34. Missouri law lets a county adopt zoning only after a countywide vote approves it, and limits building-code authority to larger counties unless local voters approve it, and Dade County's own site shows neither56. Floodplain development is the exception that needs a permit almost everywhere in Missouri, including here7.
At a glance
- Building permit
- Not required; Dade County has no building department and no adopted building code1
- Zoning
- No countywide zoning department or ordinance found on the county's official site2
- Septic
- Required since 1996; a county 'permit to construct' from the Dade County Health Department, no property-size exemptions3
- Floodplain development
- A permit is required for all development in a mapped flood hazard area, plus a No-Rise Certificate if it's in the floodway7
- Water wells
- A landowner may install their own well or pump without a permit; a hired contractor needs a restricted permit8
- RV, tiny home & manufactured home living
- No official Dade County rule was found either way; confirm with the County Clerk's office before you plan around one9
- Farm buildings
- Exempt from county fire-protection ordinances statewide, and from the county's flood-hazard-area rule if built outside the mapped area10
Who to call
Septic permits
Dade County Health Department (Environmental Public Health)
On-site sewage disposal system 'permit to construct', inspections, and installer/soil-evaluator registration for Dade County
413 W Water Street, Greenfield, MO 65661
Also useful
Dade County Courthouse (County Clerk / Commission)
General county government contact at the Dade County Courthouse; the county has no separate building, zoning or floodplain office to direct land-use questions to
300 Water Street, Greenfield, MO 65661
Contact details are copied from each office’s official page and were checked against it on September 24, 2026.
Do you need a building permit in Dade County, Missouri?
No. Dade County has no building or planning department, and Missouri's own County Building Codes dataset confirms the county has not adopted a residential building code1. Missouri law only gives building-code authority under RSMo 64.170 to counties of the first and second classification, and any county that hadn't already adopted a code before August 28, 2001 needs voter approval to adopt one now6. Dade County's official site shows no adopted code and no such vote. Farm buildings and farm structures are separately protected: no Missouri county fire-protection or fire-prevention ordinance can require a permit for erecting, repairing or extending them10.
Who do you contact about permits in Dade County?
There's no county building or planning department to call, because Dade County requires no residential building permit and shows no zoning department on its official site12. For septic permits, inspections and installer registration, the Dade County Health Department at 413 W Water Street in Greenfield is the right office4. For general county-government questions, including floodplain development, the County Clerk and Commission sit at the Dade County Courthouse, also in Greenfield9.
Does Dade County have zoning?
No countywide zoning ordinance or department appears on Dade County's official site2. Under Missouri law, a non-charter county like Dade can only adopt county zoning after the question is put to a countywide vote and a majority approves it5; nothing on the county's site shows that vote happened. The incorporated City of Greenfield runs its own local government and may set its own land-use rules separate from the county, so confirm directly with Greenfield City Hall if your land is inside city limits2.
How do septic permits work in Dade County?
Every on-site sewage disposal system in Dade County has needed a "permit to construct" from the county since 1996, and the county's own ordinance adopts Missouri's standards with no exemption for property size4. Since 2004, only an installer registered with the Missouri Department of Health and Senior Services may install a system4. That's notable because Missouri's statewide rule exempts some residential lots under 3 acres from permitting, but says the exemption doesn't apply in every county — Dade County's own no-size-exemption ordinance is exactly that kind of exception, so don't assume a small lot skips the permit here114. Once you apply, a registered contractor must notify the county by 9:00 a.m. the day before the system is finished, or by 9:00 a.m. two days before if the installer isn't registered, and the system must stay open for inspection until 3:00 p.m. on completion day; the county must give written results within three working days12. Soils make this worth planning for: only about 2.9% of Dade County's land has no severe limitations for a conventional septic drain field, among the lowest shares in this guide series, so get a soil morphology evaluation from a DHSS-registered evaluator before you commit to a site134.
Can you live in an RV, tiny home or manufactured home on your land in Dade County?
No official Dade County or Missouri source found during research states a specific rule allowing, limiting or prohibiting RV, tiny-home or manufactured-home occupancy on private land here. Dade County's site shows no zoning department, but the absence of a zoning page doesn't by itself prove these uses are unrestricted — treat it as unconfirmed rather than a green light. Call the County Clerk's office at the Dade County Courthouse before you plan a purchase around living in an RV, tiny home or manufactured home, and ask specifically about floodplain rules if your site is near water, since a flood hazard area permit can apply regardless of the structure type97.
Building a home in Dade County: the steps, in order
- Confirm whether your parcel is unincorporated Dade County or inside the City of Greenfield or another municipality, since city rules can differ2.
- If unincorporated, know that no county building permit is required before you start construction1.
- Apply for your septic "permit to construct" through the Dade County Health Department before any system is installed, using a Missouri-registered installer4.
- If your site is in or near a mapped flood hazard area, get a floodplain development permit — and a No-Rise Certificate if you're in the regulatory floodway — before you build7.
- If you're drilling your own well, you can do the work yourself without a state site permit, but a hired contractor needs a restricted permit8.
- If you're building inside Greenfield or another city, contact that city hall directly — the county-level answers above may not apply there.
What to check before you buy land in Dade County
Soils: only about 2.9% of Dade County's land has no severe limitations for a conventional septic drain field, so get a site evaluation from the Health Department before you count on a standard system134. Flooding: development anywhere in a mapped flood hazard area needs a permit, and projects in the regulatory floodway need an engineered No-Rise Certificate first7. Water: a landowner can install their own well or pump without a state permit, though a hired contractor needs one8. Taxes: Dade County's effective property tax rate runs about 0.7%, with a median annual bill near $1,0221415. Setting: about 5.2% of the county is federal land, population density is light at about 15.7 people per square mile, and the nearest metro area is roughly 37 miles away161718.
Watch-outs
- Dade County's "no zoning" and "no building permit" answers come from the county's own site listing no such department, at medium-to-high confidence; no official page explicitly states the negative, so confirm your specific project with the County Clerk's office9.
- Missouri's statewide septic exemption for small residential lots under 3 acres does not apply in Dade County, which has no property-size exemption at all — budget for a permit regardless of lot size114.
- No official source confirms RV, tiny-home or manufactured-home occupancy rules in Dade County; treat this as unconfirmed rather than unrestricted, and ask the County Clerk's office directly9.
Sources
- Dade County, Missouri - Government Offices (2026 county census)
- Dade County, Missouri - Government Offices (2026 county census)
- Dade County Health Department - Sewage Laws (2026 county census)
- Dade County Health Department (Environmental Public Health) (dadecountyhealthdept.com)
- RSMo § 64.090 — Planning and zoning powers of county commission (Missouri statewide rule), quoted and re-checked
- RSMo § 64.170 — County commissions control construction and issue building permits (Missouri statewide rule), quoted and re-checked
- Floodplain Forms | SEMA, quoted and re-checked
- Water Wells - PUB2945, quoted and re-checked
- Dade County Courthouse (County Clerk / Commission) (dadecountymo.gov)
- RSMo Section 64.003 — Farm buildings and farm structures (Missouri statewide rule), quoted and re-checked
- OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
- RSMo Section 701.050, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Federal land share: Bolthole Index county data
- Population density: Bolthole Index county data
- Distance to the nearest metro area: Bolthole Index county data
Written September 24, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.