Bolthole Index

Indian River County, Florida

Building permits, zoning and septic rules in Sebastian, Florida

Inside Sebastian city limits in Indian River County, Florida, the city's Building Department issues building permits1 and the city's Community Development Department administers zoning2. Septic permits for every address in Indian River County, city or not, come from the county health department's Environmental Health office3. Sebastian zones its land into districts such as RE-40, RS-20 and RS-104, and parking an RV on a lot is allowed but living in it is not5.

At a glance

Building permits
Issued by the City of Sebastian Building Department, not the county1
Zoning
City zoning with RE-40, RS-20, RS-10, RM-8, RM-10 and PUD-MH districts4
Septic
Permitted by the county health department's Environmental Health office3
RV living
Not allowed on an improved lot; storage only5
Minimum home size
1,200 sq ft in RS-10, 1,400 in RS-20, 1,600 in RE-40678
Minimum lot (RS-10)
9,500 sq ft, 80 ft wide, 100 ft deep9
Accessory dwelling
One per parcel, no RVs or mobile homes10
Tiny homes
No general rule confirmed; ask Community Development2

Who to call

Building permits

City of Sebastian Building Department

Building permits, plan review and inspections inside Sebastian city limits

772-589-5537

Permits@CityofSebastian.org

1225 Main Street, Sebastian, FL 32958

Online permits →

Building permits

City of Sebastian Online Permits

How to apply for building permits in Sebastian and how owner-builders start

Building permits

City of Sebastian Building Permit Exemption for Work Under $7500

Request form for the small-work building permit exemption inside Sebastian

Zoning

City of Sebastian Community Development Department

Zoning, land development regulations, variances, site plans and subdivision review inside Sebastian

772-589-5330

1225 Main Street, Sebastian, FL 32958

Septic permits

Florida Department of Health in Indian River County — Environmental Health

Septic (onsite sewage) permitting and inspection for Indian River County, including Sebastian

772-794-7440

1900 27th St., Vero Beach, FL 32960

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

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

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Does Sebastian, FL have zoning, and what does it mean for lots, setbacks and RVs?

Yes. Sebastian adopts its own zoning, with published districts including RE-40, RS-20, RS-10, RM-8, RM-10 and PUD-MH4. The Community Development Department administers the city's zoning and land development regulations2.

Dimensions depend on the district. In RS-10, the minimum lot is 9,500 square feet, 80 feet wide and 100 feet deep9; setbacks are 25 feet in front, 10 feet on the sides and 20 feet at the rear11; the maximum height is 25 feet12. In RS-20, the minimum lot is 20,000 square feet, 100 feet wide and 150 feet deep13; setbacks are 30 feet in front, 15 feet on the sides and 25 feet at the rear14; the maximum height is 35 feet15. Building coverage is capped at 30% in both16. Lots near wetlands or open water face extra setbacks11.

Do you need a building permit in Sebastian, and who issues it?

Inside Sebastian city limits, the City of Sebastian Building Department handles building permits, plan review and inspections1. Indian River County's Building Division covers unincorporated land only17, so a buyer inside the city should not start at the county counter.

Applications go through the city's online portal, and an owner-builder's first application must be made in person at 1225 Main Street18. Florida allows an owner to act as their own contractor on a one-family or two-family home for their own use, not for sale or lease19. Sebastian also offers a request form for certain work valued under $750020. A new residence needs a certificate of occupancy, and the required trees must be planted before it is issued21.

How do septic permits work inside Sebastian?

Septic permits for property in Indian River County, including inside Sebastian, come from the Florida Department of Health in Indian River County, Environmental Health3. The city does not issue them. Florida law requires a permit before anyone installs, repairs, modifies or abandons a septic system22.

Soil is the catch. Only about 0.1% of Indian River County soils rate as not limited for a conventional drain field23, so expect a site evaluation and possibly an engineered system. If public sewer becomes available, the owner of a working septic system must generally connect24. Sebastian's rules for accessory dwellings send them to central water and sewer when available, or to the health department's well and septic requirements25. Call Environmental Health at 772-794-7440 before you buy26.

Can you live in an RV, tiny home or manufactured home in Sebastian?

Not in an RV on a residential lot. Sebastian allows an RV to be parked on an improved lot but not used for sleeping, housekeeping or living quarters, and limits it to 40 feet in length and two RVs outside a garage5. Sleeping on public property is prohibited by the city's trespass ordinance27.

Manufactured housing may be permitted if it meets city standards, and mobile homes are limited to the R-MH and PUD-MH districts28. An accessory dwelling unit is allowed once per parcel, and it cannot be a mobile home or an RV10. We could not confirm a general tiny-home rule; ask Community Development at 772-589-53302.

Building a home in Sebastian: the steps, in order

  1. Confirm the zoning district and its lot size, setbacks and minimum floor area with Community Development2. Minimum floor area is 1,200 square feet in RS-106, 1,400 in RS-207 and 1,600 in RE-408.
  2. Contact Environmental Health about septic or sewer before closing3.
  3. Apply for the building permit with the Building Department; owner-builders apply in person first18.
  4. Schedule inspections through the city's portal1.
  5. Plant the required trees and obtain the certificate of occupancy21.

What stays with Indian River County, and what to check before you buy in Sebastian

Septic and well permits sit with the county health office rather than the city3. Wells under 6 inches in diameter need a permit in Indian River County29; we could not confirm which office issues them inside Sebastian, so ask Environmental Health. Land outside city limits follows the county's rules; see the Indian River County page.

County-level costs: Indian River County's effective property tax rate is 0.7%30, the median property tax bill is $2,28831, and a typical home insurance premium is $3,877 a year32. Check the flood zone before you commit; county permits are reviewed against current FEMA flood maps33.

Watch-outs

  • Do not use the county's building counter for a lot inside city limits; Sebastian's Building Department issues the building permits there1.
  • An RV parked on a Sebastian lot cannot be lived in5.
  • Septic permit fees, the city's own permit fees and a general tiny-home rule were not confirmed; ask the Building Department at 772-589-5537 and Environmental Health1.
  • Lot-size figures differ by district, so confirm your parcel's district with Community Development before relying on any number here4.

Sources

  1. City of Sebastian Building Department (cityofsebastian.org)
  2. City of Sebastian Community Development Department (cityofsebastian.org)
  3. Onsite Sewage & Septic, quoted and re-checked
  4. Sebastian LDC Sec. 54-2-5.2.2 Single-Family Residential District (RS-20) (Sebastian), quoted and re-checked
  5. Sebastian LDC Sec. 54-2-7.13 Mobile homes, travel trailers, campers, boats, trailers, and recreational vehicles (Sebastian), quoted and re-checked
  6. Sebastian LDC Sec. 54-2-5.2.3 Single-Family Residential District (RS-10) (Sebastian), quoted and re-checked
  7. Sebastian LDC Sec. 54-2-5.2.2 Single-Family Residential District (RS-20) (Sebastian), quoted and re-checked
  8. Sebastian LDC Sec. 54-2-5.2.1 Residential Estate District (RE-40) (Sebastian), quoted and re-checked
  9. Sebastian LDC Sec. 54-2-5.2.3 Single-Family Residential District (RS-10) (Sebastian), quoted and re-checked
  10. Sebastian LDC Sec. 54-2-7.23 Accessory dwelling units (Sebastian), quoted and re-checked
  11. Sebastian LDC Sec. 54-2-5.2.3 Single-Family Residential District (RS-10) (Sebastian), quoted and re-checked
  12. Sebastian LDC Sec. 54-2-5.2.3 Single-Family Residential District (RS-10) (Sebastian), quoted and re-checked
  13. Sebastian LDC Sec. 54-2-5.2.2 Single-Family Residential District (RS-20) (Sebastian), quoted and re-checked
  14. Sebastian LDC Sec. 54-2-5.2.2 Single-Family Residential District (RS-20) (Sebastian), quoted and re-checked
  15. Sebastian LDC Sec. 54-2-5.2.2 Single-Family Residential District (RS-20) (Sebastian), quoted and re-checked
  16. Sebastian LDC Sec. 54-2-5.2.3 Single-Family Residential District (RS-10) (Sebastian), quoted and re-checked
  17. Permit Procedures and Guidelines, quoted and re-checked
  18. City of Sebastian Online Permits (cityofsebastian.org)
  19. 2026 Florida Statutes § 489.103, Exemptions (Florida statewide rule), quoted and re-checked
  20. City of Sebastian Building Permit Exemption for Work Under $7500 (cityofsebastian.org)
  21. Sebastian LDC Sec. 54-3-14.9 Residential tree requirements (Sebastian), quoted and re-checked
  22. OSTDS Construction Application (Florida statewide rule), quoted and re-checked
  23. 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
  24. flsenate.gov (Florida statewide rule), quoted and re-checked
  25. Sebastian LDC Sec. 54-2-7.23 Accessory dwelling units (Sebastian), quoted and re-checked
  26. Florida Department of Health in Indian River County — Environmental Health (indianriver.floridahealth.gov)
  27. Sebastian Code Sec. 70-7 Trespass (Sebastian), quoted and re-checked
  28. Sebastian LDC Sec. 54-2-7.13 Mobile homes, travel trailers, campers, boats, trailers, and recreational vehicles (Sebastian), quoted and re-checked
  29. Private Well Water, quoted and re-checked
  30. Effective property tax rate: Bolthole Index county data
  31. Median property tax bill: Bolthole Index county data
  32. Typical home insurance premium: Bolthole Index county data
  33. Building Division, quoted and re-checked

Written October 16, 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 Sebastian

Sebastian’s own rules

  • Certificate of occupancyRequired

    New residences inside Sebastian city

    • Required trees must be planted before the certificate of occupancy issues.
    “The required number of trees shall be planted prior to the issuance of a certificate of occupancy for new residences.”
  • Local zoningPresent

    Land inside Sebastian city limits

    “The RS-10 District is established to implement comprehensive plan policies for low-density residential development on lots of 10,000 square feet.”
  • Zoning districtsPublished

    Zoning districts in Sebastian city (RE-40, RS-20, RS-10, RM-8, RM-10, PUD-MH, etc.)

    “The RS-20 district is established to implement comprehensive plan policies for low density residential development on lots of 20,000 square feet.”
  • Minimum dwelling sizeSpecified

    RE-40 Residential Estate District, Sebastian city

    • Exclusive of porches, terraces, attached garages, carport or unroofed areas

    minimum floor area: >= 1600 sq ft

    “The minimum floor area required, exclusive of porches, terraces, attached garages, carport or unroofed areas, shall be 1,600 square feet.”
    2 more reviewed findings on this topic
  • Minimum lot sizeSpecified

    RS-10 district, Sebastian city

    minimum lot size: >= 9500 sq ft · minimum lot width: >= 80 feet · minimum lot depth: >= 100 feet

    “Minimum lot size: 9,500 square feet Minimum lot width: 80 feet Minimum lot depth: 100 feet”
    One more reviewed finding on this topic
  • SetbacksSpecified

    RS-10 district, Sebastian city

    • Must also comply with wetland and open-water setbacks in section 54-3-11.1(c)

    front: >= 25 feet · secondary front: >= 20 feet · side: >= 10 feet · rear: >= 20 feet

    “Front setbacks 25 feet Secondary front yard setbacks: 20 feet Side setbacks: 10 feet Rear setbacks: 20 feet”
    One more reviewed finding on this topic
  • Lot coverageSpecified

    RS-10 district, Sebastian city

    max building coverage: <= 30 percent · max impervious surface: <= 55 percent · min open space: >= 50 percent

    “Maximum building coverage: 30% Maximum impervious surface: 55% Minimum open space: 50%”
    One more reviewed finding on this topic
  • Building heightSpecified

    RS-10 district, Sebastian city

    max height: <= 25 feet

    “Maximum density: One dwelling unit per 10,000 square feet (2) Maximum height: 25 feet”
    One more reviewed finding on this topic
  • Living in an RVLimited

    RVs on improved residential lots inside Sebastian city

    • Parking/storage only; not used for residential, office or commercial purposes except temporary construction trailers
    • RV must be owned/rented by resident of the lot
    • No more than two RVs outside enclosed garage
    • RV max 40 feet length (utility/cargo trailers 24 feet)
    • Must be behind front building line and at least 25 feet from front lot line, or in carport/garage
    • Must bear current registration

    max RV length: <= 40 feet (utility or cargo trailer 24 feet)

    “The recreational vehicle is not used for sleeping, housekeeping, or living quarters while parked on any improved lot.”
  • Camping on your landLimited

    Camping on public property inside Sebastian city; private-land camping not addressed

    • Does not apply during declared states of emergency
    • Excludes camping for recreational purposes on property designated for such purposes
    • Fine up to $500 and up to 60 days imprisonment
    “It is prohibited, unlawful, and a violation of this section for any person to regularly engage in public camping or sleeping on any public property”
  • Manufactured homesLimited

    Mobile and manufactured homes inside Sebastian city

    • Mobile homes only in R-MH or PUD-MH districts
    • Manufactured housing must meet city building codes, F.S. ch. 320 and 553, HUD 1974 standards, fire codes and be compatible with conventional housing
    • PUD-MH minimum area 25 acres
    “Manufactured housing may be permitted if the units comply with the following standards:”
  • Accessory dwellingsLimited

    ADUs on single-family lots inside Sebastian city

    • One ADU per tax parcel
    • ADU 300 sq ft minimum, max 50% of principal dwelling or 1,000 sq ft
    • No mobile homes or RVs as ADUs
    • Building permit application needs affidavit of rental at affordable rate
    • No transient short-term rental

    max ADU size: <= 1000 sq ft (or 50% of principal dwelling under-air area, whichever is less)

    “One accessory dwelling unit is allowed per tax parcel.”
  • Mandatory utility hookupConditional

    Accessory dwelling units inside Sebastian city (general new-home rule not found)

    • Applies to ADUs only; otherwise must meet health department well and septic requirements.
    “The accessory dwelling unit shall be serviced by centralized water and wastewater if those utilities are available, or meet the health department's well and septic requirements.”
  • Building in a floodplainRequired

    Subdivision and manufactured home park proposals in flood hazard areas inside Sebastian city

    • Chapter 46 flood-resistant development; other articles not opened
    “Subdivision proposals, including proposals for manufactured home parks and subdivisions, shall be reviewed to determine that:”
  • Short-term rentalsLimited

    Accessory dwelling units inside Sebastian city; general STR rules (sec. 54-2-7.22) not opened

    • Only ADU transient rental prohibition confirmed
    “The leasing of the ADU for transient short-term rentals as defined in section 54-2-7.22 (1)(a).”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Sebastian or Indian River County directly.

  • Owner-builder exemption — Owner-builder exemption inside Sebastian city
  • Inspections — Building inspections inside Sebastian city
  • Tiny homes — Tiny homes inside Sebastian city
  • Who permits septic — Septic regulation inside Sebastian city
  • Septic permit — Septic permits inside Sebastian city
7 more unanswered
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • 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 Sebastian publishes no rule on the point, not that none exists. Indian River County’s page lists the county offices to call.

← All of Indian River County: county rules, score and offices