Bolthole Index

Phelps County, Missouri

Building permits, zoning and septic rules in St. James, Missouri

St. James, Missouri requires building permits for construction and regulated building-system work, subject to listed exemptions.1 St. James has city zoning; Phelps County’s lack of zoning applies outside incorporated city limits.23 Qualifying onsite wastewater systems in Phelps County now go through Missouri DHSS, but confirm the city address and sewer requirements before planning septic.4

At a glance

Building permits
Required for construction and regulated systems; listed exemptions apply1
Zoning
City zoning applies inside St. James2
Residential lot size
R-1 single-family lots: at least 7,200 square feet and 60 feet wide5
Manufactured homes
R-1 allows Class A; excludes mobile homes and Class B6
RV temporary-living fee
$50; permit valid for no more than 30 days—ask the city about eligibility7
Septic construction
Most installations and repairs require a construction permit; confirm any exemption with DHSS84

Who to call

Building permits

St. James Zoning & Building Office

City building permits, zoning questions and property or subdivision planning approval

573-265-7013 ext. 200

Septic permits

Missouri DHSS Onsite Wastewater Treatment Program

State onsite wastewater construction permitting and exemption questions; confirm jurisdiction for the city address

573-751-6095

[email protected]

PO Box 570 Jefferson City, MO 65102-0570

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in St. James means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in St. James, MO?

St. James requires building permits for construction and regulated electrical, gas, mechanical and plumbing work, with specific exemptions rather than a blanket exemption for small projects.1 Certain one-story detached tool or storage sheds, playhouses and similar structures qualify for an exemption only at 36 square feet or less.1 Ask the St. James Zoning & Building Office to classify the proposed work before ordering materials.9

Starting regulated work before obtaining the necessary building permit adds a surcharge equal to 100% of the actual permit fee, on top of that fee.1 A St. James building permit expires after 180 days without work starting, or after work is suspended or abandoned for 180 days; written extensions may be granted.10

Who issues building permits in St. James, and where do you apply?

The St. James Zoning & Building Office is the city contact for building permits and zoning, property and subdivision planning questions; reach the office through Public Works at 573-265-7013 ext. 200.9 The city provides printable building, fence and other permit applications on its website.9

St. James has adopted building and technical codes through its Building Regulations chapter.11 Ask the city office which application fits the project, what plans to submit and how to arrange inspections.9 We could not confirm the complete city inspection schedule, certificate-of-occupancy requirements or an owner-builder exemption; resolve those questions with the St. James Zoning & Building Office before committing to a construction timetable.9

Does St. James have zoning, and what are the residential lot rules?

St. James administers its own zoning regulations inside city limits.2 For a single-family dwelling in the R-1 Residential District, St. James requires a lot of at least 7,200 square feet with at least 60 feet of width; other permitted uses have different dimensional requirements.5 Ordinary R-1 buildings may not exceed 35 feet in height, with specified exceptions.12

R-1 allows Class A manufactured homes as single-family or two-family dwellings, but excludes mobile homes and Class B manufactured homes.6 Ask the city office to identify the parcel’s district and applicable setbacks before choosing a home or positioning a foundation.9 For land outside city limits, use the Phelps County guide: the county’s absence of planning and zoning applies to unincorporated land.3

How do septic permits work inside St. James?

Missouri requires a construction permit before installing or repairing most onsite wastewater treatment systems, although some single-family residential lots may be exempt.8 Phelps County’s local OWTS construction-permit program ended in October 2024, with new qualifying applications falling under Missouri DHSS.4 Contact the DHSS Onsite Wastewater Treatment Program about the St. James address and obtain a construction permit or confirmation of exemption before beginning wastewater work.813

We could not confirm St. James’s precise public-sewer connection trigger; ask the city Zoning & Building Office to resolve sewer requirements before pursuing onsite treatment.9 DHSS application fees for onsite sewage construction, modifications and repairs are temporarily suspended effective August 2026.14 Phelps County’s soil figures show only 4.7% rated not limited for conventional septic drain fields; that county-wide rating supports a site evaluation, not a conclusion that septic is impossible on a particular city lot.15

Can you live in an RV or tiny home in St. James?

St. James’s building regulations identify a temporary-living RV permit with a $50 fee and validity of no more than 30 days.7 That fee provision alone does not establish that a particular residential lot qualifies; ask the St. James Zoning & Building Office about eligibility, location and occupancy conditions before using an RV as housing.79

We could not confirm a city rule specifically allowing tiny-home occupancy, a minimum dwelling floor area or a separate accessory-dwelling-unit approval route; take the proposed design and use to the city office.9 St. James has both zoning and adopted building regulations, so a small footprint needs review under the city’s rules.211

Building a home in St. James: what are the steps, in order?

  1. Ask the St. James Zoning & Building Office to confirm the parcel’s zoning and discuss property or subdivision planning approval before finalizing the site plan.9
  2. Resolve public-sewer questions with the city office; if onsite wastewater treatment is proposed, ask DHSS about the construction permit or exemption before starting that work.9813
  3. Obtain the applicable St. James building permit before regulated construction begins, and request the project’s inspection and occupancy instructions from the city office.19
  4. Check floodplain development requirements before building in a floodplain; development requires a floodplain permit, and regulatory-floodway work requires an engineering No-Rise Certificate before permit issuance.16
  5. Obtain MoDOT driveway authorization if constructing or modifying a driveway on MoDOT right-of-way.17

Watch-outs

  • Do not apply Phelps County’s unincorporated no-zoning answer to a St. James city lot.32
  • A St. James RV temporary-living permit is valid for no more than 30 days; confirm eligibility with the city office before relying on RV housing.79
  • St. James cannot locate property lot lines; use a professional surveyor to resolve boundaries before planning construction.9

Sources

  1. Chapter 500 Building Regulations - City of St. James, MO (St. James), quoted and re-checked
  2. Table of Contents - City of St. James, MO (St. James), quoted and re-checked
  3. Phelps County Commission Record — October 2017, quoted and re-checked
  4. Phelps/Maries County Health Department OWTS transition notice, quoted and re-checked
  5. Article IV: R-1 Residential District - City of St. James, MO (St. James), quoted and re-checked
  6. Article IV: R-1 Residential District - City of St. James, MO (St. James), quoted and re-checked
  7. Chapter 500 Building Regulations - City of St. James, MO (St. James), quoted and re-checked
  8. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  9. St. James Zoning & Building Office (stjamesmo.org)
  10. Chapter 500 Building Regulations - City of St. James, MO (St. James), quoted and re-checked
  11. Chapter 500 Building Regulations - City of St. James, MO (St. James), quoted and re-checked
  12. Article IV: R-1 Residential District - City of St. James, MO (St. James), quoted and re-checked
  13. Missouri DHSS Onsite Wastewater Treatment Program (health.mo.gov)
  14. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  15. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  16. Floodplain Forms (Missouri statewide rule), quoted and re-checked
  17. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked

Written October 12, 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.

Answers from the rulebook for St. James

St. James’s own rules

  • Building permitRequired

    Construction and regulated building, electrical, gas, mechanical, or plumbing work inside St. James city limits.

    • Permits are not required for listed exemptions, including certain 36-square-foot detached accessory structures, limited-height sidewalks and driveways, finish work, certain pools, playground equipment, awnings, fixtures, flag poles, siding, doors, windows, and roof coverings.
    • Work commencing before permit issuance incurs a fee equal to 100% of the actual permit fee in addition to the required permit fee.
    • A permit expires if authorized work does not commence within 180 days, or is suspended or abandoned for 180 days; written extensions may be granted for periods not exceeding 180 days.

    detached accessory structure exemption floor area: <= 36 square feet (one-story tool/storage shed, playhouse, or similar use) · driveway/sidewalk exemption height: <= 30 inches above adjacent grade (not over a basement or story below and not part of an accessible route) · permit commencement deadline: 180 days (extensions may be granted in writing) · pre-permit work surcharge: 100 percent of actual permit fee (in addition to required permit fee)

    “Any person who commences any work on a building, structure, electrical, gas, mechanical or plumbing system before obtaining the necessary permits shall be subject to a fee that is one hundred percent (100%) of the cost of the actual permit fee cost in addition to the required permit fee.”
  • Building code adoptedAdopted

    Building and technical codes inside St. James city limits.

    • The code is adopted through Ordinance No. 1147 dated 8-12-2019.
    • The 2015 IBC and related technical codes are modified and supplemented by Chapter 500.
    “The City of St. James hereby adopts the various building and technical codes set forth in this Chapter as the building regulations for the City.”
  • Local zoningPresent

    Land inside St. James city limits; the City adopts and administers Chapter 405 Zoning Regulations.

    “Chapter 405 Zoning Regulations (Section 405.010 – Section 405.520)”
  • Minimum lot sizeSpecified

    Single-family dwellings in the R-1 Residential District inside St. James city limits.

    • Two-family dwellings and other permitted uses have different minimum area and width requirements.

    minimum lot area: >= 7200 square feet (single-family dwelling in R-1) · minimum lot width: >= 60 feet (single-family dwelling in R-1)

    “A lot occupied by a single-family dwelling shall contain not less than seven thousand two hundred (7,200) square feet and shall not be less than sixty (60) feet in width.”
  • Building heightSpecified

    Buildings in the R-1 Residential District inside St. James city limits.

    • Public, semipublic, public-service buildings, hospitals, institutions, and schools may reach 60 feet when set back one foot for each two feet of additional height above the district limit.
    • Specified architectural and mechanical features are exempt from the height regulations.

    maximum height: <= 35 feet (ordinary R-1 building; no more than 2.5 stories)

    “No building shall exceed two and one-half (2 1/2) stories, nor shall it exceed thirty-five (35) feet in height, except as provided in Chapter 405, Article XII.”
  • Manufactured homesAllowed (with conditions)

    Class A manufactured homes used as single-family or two-family dwellings in the R-1 Residential District inside St. James city limits.

    • The R-1 provision excludes mobile homes and Class B manufactured homes.
    • Other zoning districts may have different rules.
    “Single-family dwellings, including Class A manufactured homes, but not including mobile homes and Class B manufactured homes.”
  • Permit feesPublished (with conditions)

    City building permits inside St. James city limits.

    • The code directs users to Section 500.110 for the permit-fee schedule.
    • RV temporary-living permits have a separate $50 fee and maximum 30-day validity.

    RV temporary-living permit fee: 50 USD (valid for no more than 30 days)

    “The fees to be charged for building permits from and after the passage of this Article shall be as follows:”
  • Permit processPartial

    Building-permit process inside St. James city limits.

    • The Code Official administers the building-code enforcement agency.
    • Applications, inspections, fee schedules, expiration, extensions, and appeals are governed by Chapter 500.
    • A permit may expire after 180 days without commencement or after 180 days of suspension or abandonment.

    permit expiration period: 180 days (written extensions may be granted for periods not exceeding 180 days)

    “Every permit issued shall become invalid and expired unless the work on the site authorized by such permit is commenced within one hundred eighty (180) days after its issuance, or if the work authorized on the site by such permit is suspended or abandoned for a period of one hundred eighty (180) days after the work is commenced.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask St. James or Phelps County directly.

  • Owner-builder exemption — Owner-builders inside St. James city limits.
  • Inspections — Building inspections inside St. James city limits.
  • Certificate of occupancy — Certificates of occupancy inside St. James city limits.
  • Minimum dwelling size — Residential dwellings inside St. James city limits.
  • Lot coverage — Lot coverage inside St. James city limits.
10 more unanswered
  • Tiny homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Short-term rentals

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 St. James publishes no rule on the point, not that none exists. Phelps County’s page lists the county offices to call.

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