Bolthole Index

Ada County, Idaho

Building permits, zoning and land rules in Boise City, Idaho

Boise City, Idaho requires a city building permit to build a home, and city zoning controls allowed uses and building dimensions.12 Boise City is in Ada County; inside city limits, start with the city Building and Planning divisions rather than the county development counter.13 A septic system needs authorization under Boise’s sewer-connection rules and a Central District Health permit.4

At a glance

Building permit
Required for home construction; City Building Division1
Zoning
City Development Code; district and use-specific standards apply2
Septic permits
Central District Health, subject to city sewer-connection rules4
Tiny homes on wheels
Allowed in listed districts with use-specific standards5
Owner-builder
Homeowners may work on their primary residence; required permits still apply1
Wells
Licensed driller and drilling permit required6

Who to call

Building permits

City of Boise Building Division

City building permits and homeowner project guidance

(208) 608-7070

150 N Capitol Blvd, Boise, ID 83702

Online permits →

Planning & zoning

City of Boise Planning Division

City zoning, allowed uses, zoning maps and development project guidance

(208) 608-7100

[email protected]

150 N Capitol Blvd, Boise, ID 83702

Online permits →

Septic permits

Central District Health, Boise Office

Septic permitting authority for Ada County, including authorized systems inside Boise City

208-375-5211

707 N Armstrong Pl., Boise, ID 83704

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 Boise City means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Boise City, Idaho?

Boise City requires a building permit to build a home, and the City Building Division is the starting point for a residential construction project.1 Boise City has adopted building codes, including the International Residential Code and International Energy Conservation Code.7 Homeowners may perform work on their primary residence without registering as a contractor with Idaho, but homeowners acting as a subcontractor must obtain the required permit and perform that work themselves.1 Ask the Building Division which building and trade applications your particular project needs.1

Who issues building permits in Boise City, and how do you reach them?

Contact the City of Boise Building Division at (208) 608-7070 for building-permit questions; the city lists its address as 150 N Capitol Blvd, Boise, ID 83702.1 For zoning and land-use questions, contact the City Planning Division at (208) 608-7100 or [email protected].3 Boise’s online Permitting and Licensing system lets homeowners apply for trade permits and certain smaller building projects, schedule inspections and pay permit fees.1 Ask Building for the correct application route for a new home rather than assuming a small-project application covers new construction.1

Does Boise City have zoning, lot-size rules and setbacks?

Boise City has its own Development Code with zoning districts and allowed-use regulations.2 Boise’s R-1C Residential: Traditional district has a general minimum lot area of 3,500 square feet, subject to residential-small-lot provisions and other code adjustments.8 In contrast, Boise’s A-1 Open Land: Very Low Density district has a minimum lot area of 1 acre.9 A-1 building setbacks are 20 feet at the front and street side, 10 feet at the interior side and 30 feet at the rear.10 Ask City Planning to identify the parcel’s district and overlays before fitting a house onto a lot.3

How do septic permits work inside Boise City?

A septic permit alone does not establish that a Boise City parcel can avoid sewer connection: an individual system must also be authorized under the city’s sewer-connection rules.4 Boise’s reviewed sewer provisions include stated waiver conditions involving a Central District Health permit or a single-family dwelling on a parcel of 5 acres or more; these are conditional waiver provisions, not a blanket septic exemption.4 Central District Health issues the septic permit and inspects an authorized installation.411 Contact the district’s Boise office at 208-375-5211, and resolve the city sewer question before committing to a septic design.124

Can you live in an RV or tiny home on land in Boise City?

Boise City allows tiny homes on wheels with use-specific standards in the residential districts and several mixed-use districts identified in its allowed-use table.5 Boise’s code also says maximum-density requirements do not apply to accessory tiny homes on wheels, but district and use-specific standards still matter.5 Accessory dwelling units are another conditional option in the districts listed for that use.13 We could not confirm long-term RV occupancy, temporary private-land camping or a general minimum dwelling size in Boise City; ask City Planning about the proposed occupancy and the exact parcel before buying an RV or ordering a tiny home.3

Building a home in Boise City: what are the steps, in order?

  1. Ask City Planning to identify the Boise City parcel’s zoning district, allowed use and overlays, then check the district’s lot and building standards.32
  2. Resolve sewer connection with the city; if an individual septic system is authorized, obtain the Central District Health permit and arrange the installation inspection.411
  3. Contact the City Building Division about the new-home building permit and required trade applications before construction.1
  4. Arrange required inspections through the city’s permitting system and ask Building which final occupancy approval applies to the project.114

What should you check before buying land in Boise City?

Boise City requires a building parcel to abut a public street or have a permanent access easement to a public street; site-specific Ada County Highway District requirements may also apply.15 Boise’s homeowner guide says a driveway needs Planning and Zoning approval even when no building permit is needed.1 A new well requires a licensed driller and a drilling permit, with Idaho Department of Water Resources the state contact for well-driller information.6 Ask City Planning about floodplain restrictions before purchase; the city’s shed guidance specifically requires a permit in a floodplain.31 For land outside Boise City limits, use the Ada County guide for the county’s unincorporated-area building and zoning rules.1617

Watch-outs

  • Boise’s tiny-home-on-wheels allowance is conditional and does not establish permission for ordinary RV residential occupancy; ask City Planning about the proposed use.53
  • Boise City sewer-connection approval and a Central District Health septic permit answer different questions; settle both before planning an individual wastewater system.4
  • We could not confirm Boise City’s detailed floodplain development standards or a general minimum dwelling size; ask City Planning before choosing a building footprint.3

Sources

  1. City of Boise Building Division (cityofboise.org)
  2. Boise, ID Laws (Boise City), quoted and re-checked
  3. City of Boise Planning Division (cityofboise.org)
  4. 10-2-4-1: New Construction (Boise City), quoted and re-checked
  5. 11-03-02: Table of Allowed Uses (Boise City), quoted and re-checked
  6. Wells (Boise City), quoted and re-checked
  7. Boise City Building Code Fee Schedule (Boise City), quoted and re-checked
  8. 11-02-02: Residential Zoning Districts (Boise City), quoted and re-checked
  9. 11-02-05: Open Land Zoning Districts (Boise City), quoted and re-checked
  10. 11-02-05: Open Land Zoning Districts (Boise City), quoted and re-checked
  11. Septic and Septage (Boise City), quoted and re-checked
  12. Central District Health, Boise Office (cdh.idaho.gov)
  13. 11-03-02: Table of Allowed Uses (Boise City), quoted and re-checked
  14. Accela Citizen Access Building Permit Record (Boise City), quoted and re-checked
  15. 11-04-03: Lot and Building Design and Dimensions (Boise City), quoted and re-checked
  16. Ada County Code § 7-2-4: Amendments to the 2018 International Building Code, quoted and re-checked
  17. Ada County Code § 8-2-23: Use Table, 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 Boise City

Boise City’s own rules

  • Building code adoptedAdopted (with conditions)

    Building work inside Boise City city limits subject to Boise City building regulation.

    • The fee schedule references the International Building Code, International Existing Building Code, International Residential Code, International Energy Conservation Code, and International Fire Code as adopted by Boise City.
    “As referenced in the International Building Code, the International Existing Building Code, the International Residential Code, the International Energy Conservation Code, and the International Fire Code, as adopted by Boise City, fees shall be assessed in accordance with this Building Code Fee Schedule”
  • Certificate of occupancyLimited

    Projects inside Boise City city limits requiring a certificate of occupancy or final occupancy approval.

    • A City permit record states that the certificate of occupancy is issued at final inspection.
    • The fee schedule specifically addresses projects where plan review and inspection establish a certificate of occupancy and no construction other than minor electrical, plumbing, or mechanical work is performed under separate trade permits.

    certificate of occupancy plan review and inspection fee: 175 USD (Where no construction other than minor electrical, plumbing, or mechanical work is performed under separate trade permits)

    “A fee of $175 will be charged in cases where plan review and inspection services are performed to establish a certificate of occupancy, and where there is no construction other than minor electrical, plumbing or mechanical work being performed under separate trade permits.”
  • Local zoningPresent

    Land inside Boise City city limits.

    • The Boise City Code contains Title 11, Development Code, including zoning districts and allowed-use regulations.
    “TITLE 9 BUILDING CODES AND REGULATIONS [...] TITLE 10 PUBLIC UTILITIES [...] TITLE 11 DEVELOPMENT CODE”
  • Minimum lot sizeSpecified

    R-1C Residential: Traditional district inside Boise City city limits.

    • The table states that all residential small lots must meet Section 11-04-03, Section 4.
    • The dimensional standards may be adjusted under other Code provisions.

    minimum lot area: >= 3500 square feet (Residential small lots and other Code adjustments may apply)

    “TABLE 11-02.7: R-1C LOT AND BUILDING STANDARDS [...] Lot Area (minimum) | 3,500 sf.”
    One more reviewed finding on this topic
    • Specified — A-1 Open Land: Very Low Density district inside Boise City city limits.
      “TABLE 11-02.33: A-1 LOT AND BUILDING STANDARDS [...] Lot area (minimum) | 1 acre”
  • SetbacksSpecified

    A-1 Open Land: Very Low Density district inside Boise City city limits.

    • The listed 20-foot front and street-side setbacks apply to building and parking as shown in the A-1 table.
    • The table includes a 30-foot parking setback for any yard adjacent to I-84 or I-184.
    • The height note applies when property abuts a Residential zoning district or residential use.
    “BUILDING SETBACKS (MINIMUM) [1] [...] Front | 20 ft. [...] Street Side | 20 ft. [...] Interior Side | 10 ft. [...] Rear Yard | 30 ft.”
  • Building heightSpecified

    R-1C Residential: Traditional district inside Boise City city limits.

    • The R-1C maximum is three stories not exceeding 40 feet.
    • Residential Small Lot and other Code-specific height rules may alter the general district standard.

    maximum building height: <= 40 feet (Three-story maximum also applies)

    “Building Height | 3 stories, not to exceed 40 ft.”
  • Tiny homesAllowed (with conditions)

    Tiny homes on wheels in Boise City zoning districts listed in the allowed-use table.

    • Tiny homes on wheels are marked as allowed with use-specific standards in R-1A, R-1B, R-1C, R-2, R-3, MX-1, MX-2, MX-3, and MX-H.
    • Additional zone-specific standards apply under Chapter 11-02 and use-specific standards may apply.
    • The code's dimensional notes state that maximum density requirements do not apply to Accessory Tiny Homes on Wheels.
    “Tiny home on wheels | A* | A* | A* | A* | A* | A* | A* | A* | | | | A* | | | | | |”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units in Boise City zoning districts listed in the allowed-use table.

    • Accessory dwelling units are marked as allowed with use-specific standards in R-1A, R-1B, R-1C, R-2, R-3, MX-1, MX-2, MX-3, MX-U, A-1, and A-2.
    • Additional zone-specific and use-specific standards apply.
    “Accessory Dwelling Unit | A* | A* | A* | A* | A* | A* | A* | A* | | | A* | | | | | A* | A* |”
  • Septic permitRequired

    On-site septic systems inside Boise City city limits when permitted as an alternative to required wet-line sewer connection.

    • The City may waive sewer connection requirements only under stated conditions, including a Central District Health permit for an individual wastewater disposal system or a single-family dwelling on a parcel of five acres or more.
    • A property owner installing an individual septic system must obtain a permit from the public health district.

    parcel size for one waiver condition: >= 5 acres (Single-family dwelling connection waiver condition)

    “To have a septic system installed, the property owner must obtain a permit from a public health district.”
  • Septic inspectionRequired

    Installation of an on-site septic system inside Boise City city limits when such system is authorized.

    • The public health district inspects septic installations.
    • The system must be authorized under the City's sewer-connection rules or another applicable approval.
    “Once the permit has been issued, the system should be installed by a licensed installer and inspected by the public health district.”
  • Driveway accessRequired

    Building parcels inside Boise City city limits.

    • A parcel must abut a public street or have a permanent access easement to a public street.
    • Additional driveway, alley, sidewalk, paving, and Ada County Highway District license requirements may apply under site-specific standards.
    “No building shall be constructed or erected upon any parcel not abutting a public street or having a permanent access easement to a public street.”

Rules another office applies inside Boise City

Boise City does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Well permitRequired

    New well drilling inside Boise City city limits.

    • Idaho law requires licensed well drillers and a permit before drilling.
    • The state source directs applicants to the Idaho Department of Water Resources for licensed well-driller information.
    “Idaho law requires all well drillers to be licensed and obtain a permit before drilling.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Boise City or Ada County directly.

  • Owner-builder exemption — Owner-builders performing construction inside Boise City city limits.
  • Minimum dwelling size — Minimum dwelling size inside Boise City city limits.
  • Lot coverage — Lot coverage limits inside Boise City city limits.
  • Living in an RV — Long-term or residential occupancy of recreational vehicles on private land inside Boise City city limits.
  • Camping on your land — Temporary camping on private land inside Boise City city limits.
3 more unanswered
  • Agricultural exemption
  • Building in a floodplain
  • 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 Boise City publishes no rule on the point, not that none exists. Ada County’s page lists the county offices to call.

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