Do You Need a Permit to Build a Pool in Boise? (Step by Step)

Short answer: yes. If you are adding an inground pool or spa to a home in Boise, you need a building permit before anyone breaks ground. The good news is that the process is very manageable when you know what the city wants to see. Here is exactly how it works, straight from the City of Boise’s own application and checklist, so you can plan your backyard with confidence.

Which permit does a Boise pool need?

The City of Boise handles residential pools under a dedicated permit type called 426, Residential Swimming Pool. It covers inground pools and inground spas at single family homes and duplexes, whether the pool is gunite, concrete, vinyl, or fiberglass. You can apply online through the city’s Permitting and Licensing system, or in person at the Permit Counter by appointment.

One important note before you go further: a Boise mailing address does not always mean the City of Boise is your permitting agency. Some homes with a Boise address sit in unincorporated Ada County, and those pools are permitted through Ada County Development Services instead. Your builder should confirm the right jurisdiction for your parcel on day one. (We cover the Ada County differences further down.)

Step 1. Check for approvals you need before you apply

The city is clear that some projects need Planning and Zoning approval before the building permit application. According to the 426 submittal checklist, examples include properties in a Historic District, in the Floodplain, on substandard lots, and projects in the Hillside Overlay that substantively alter the grading.

The Hillside Overlay matters a lot in the Boise foothills. The city says the overlay applies where slope exceeds 15 percent or where there are concerns like unstable or expansive soils, high groundwater, springs, or erosion. Hillside permits are sorted into Category 1, 2, or 3. Grading that significantly changes approved topography, or retaining walls over four feet of exposed height, are examples that push a project into Category 2. If your lot is on a slope, plan for this review early.

Not sure where your property falls? The application itself asks whether the property is in a Historic District, Design Review zone, Hillside, Floodplain, or the Wildland Urban Interface (WUI), and the city points homeowners to its GIS maps or a planner appointment to find out.

Tip: if you live in a subdivision with an HOA, get your HOA’s architectural approval at this stage too. HOA rules are separate from city rules, and it is much easier to adjust a design before engineering is finished. We help you put together the design package your HOA needs, so approval does not slow down your permit.

Step 2. Get the pool engineered

For gunite, shotcrete, and other built in place pools, Boise requires structural calculations stamped and signed by an Idaho licensed engineer. Pre manufactured pools like fiberglass and vinyl follow a different path: the city asks for the ICC-ES evaluation report and the manufacturer’s installation instructions instead.

This is one reason a custom gunite pool is a true engineered structure. The engineer accounts for your pool’s shape, depth, steel reinforcement, and local conditions. For context, the City of Boise lists a minimum frost depth of 24 inches in its adopted design criteria, and it classifies weathering as severe. Idaho winters are real, and the design has to respect them.

At Maverick, we work with a licensed Idaho engineer who stamps the structural calculations for every project. As pool builders in Boise, we prepare and submit the permit package and schedule every inspection.

Step 3. Prepare the drawings the city requires

The 426 checklist lists the drawings a complete submittal needs. Plans are drawn to scale (one quarter inch equals one foot is typical) on sheets at least 11 by 17 inches:

• Site plan showing the pool location, streets, new and existing buildings, and dimensions to property lines, other buildings, structures, and retaining walls. Your barrier plan (fences, gates, alarms) should also be shown here.
• Pool plan showing the shape of the pool with dimensions.
• Section view showing depth and bottom profile, with dimensions and details of all structural components and connections, including reinforcement sizes and spacing.
• Barrier details. If an automatic cover is your barrier, it needs to show on the pool plan and section view.
• Grading and drainage and erosion control plans, if the Hillside process or the city’s Erosion Control team requires them.

The application also asks for practical details: the disinfection system, filter system, how backwash water will be disposed of (sanitary sewer, septic, lawn application, or an infiltration bed), maximum width, length, and depth, and total pool area. It also asks whether the project will disturb 2 cubic yards of soil or more. Pools over 500 square feet must list a certified City of Boise erosion and sediment control Responsible Person who will be on site.

Step 4. Submit with a registered contractor

Idaho law (Idaho Code 54-5209, quoted on the Boise application) says building permits are not issued without an Idaho contractor registration number, unless the applicant is exempt under Idaho Code 54-5205. The city treats an application without that number, or a declared exemption, as incomplete.

You will also declare the project value. The city defines it broadly: the total value of all construction work on the permit, including overhead and profit, finish work, electrical, plumbing, and permanent equipment.

Step 5. Review, corrections, and fees

Here is the city’s published process: submittal, prescreen for completeness, building review, then issuance.

• Online applications are typically reviewed within two weeks, per the checklist. You get an email when fees are due, with a link to your approved documents.
• In person, a simple project can take about an hour at the counter. More complex or incomplete projects are held for later review, typically within two weeks.
• Review cycles often include correction requests, which are emailed to the applicant.
• Fees are due before the permit is issued. Boise’s fee schedule calculates the building permit fee from project valuation, and residential plan review is charged at 20 percent of the building permit fee. Trade permits, such as electrical, are obtained separately.

For a full picture of how long the whole process can take across the valley, see our guide: How Long Does Pool Permitting Take in Treasure Valley?

Step 6. Call 811, dig, and pass inspections

Before excavation, Idaho Code 55-2205 requires the excavator to notify underground utility owners through the one number service (call 811, or Idaho Digline) at least 2 business days and no more than 10 business days before digging.

Once construction starts, inspections are scheduled in the city’s Permitting and Licensing system. Any trade permits attached to the pool permit must be finaled before the final building inspection. Re-inspection fees may apply for repeat trips when work is not ready. A builder who runs a tight inspection schedule saves you time and money here.

Building in unincorporated Ada County?

If your home is outside city limits, Ada County Development Services issues the pool permit. A few details stand out on the county’s Swimming Pool Permit Application:

• Plans and specifications are submitted as PDFs by email to the county.
• Homes on septic need Central District Health approval.
• Both the contractor and the property owner must sign an acknowledgment that the pool will meet the barrier requirements of the 2018 International Swimming Pool and Spa Code (ISPSC), using a fence, automatic cover, or other approved measures. The county will not issue the permit until that letter is in hand.
• If a final inspection is not requested within one year of issuance, the county places an alert on the property that blocks future building permits until the pool passes final.

Meridian, Eagle, Star, and Nampa each run their own process too. Our Meridian and Eagle guides walk through what is different in those cities.

Why this matters when you pick a builder

Permits are not just paperwork. They protect your family, your neighbors, and your home’s resale value, since unpermitted work can cause headaches when you sell. A builder who knows Boise’s process gets the engineering, drawings, barrier plan, and erosion control right the first time, which means fewer correction cycles and an earlier first swim.

At Maverick Pools, permitting is part of our design and build process. We prepare and submit the permit package, coordinate the engineer, and schedule every inspection.

Frequently asked questions

Do I need a permit to build an inground pool in Boise?

Yes. The City of Boise requires a 426 Residential Swimming Pool permit for inground pools and inground spas. Homes in unincorporated Ada County get their pool permit from Ada County Development Services.

How long does a Boise pool permit take?

The City of Boise says online applications are typically reviewed within two weeks. Correction requests, Hillside review, or other prior approvals can add time.

Does a gunite pool need an engineer in Boise?

Yes. For gunite, shotcrete, and other built in place pools, the city requires structural calculations stamped and signed by an Idaho licensed engineer.

Do I need a fence around my pool in Boise?

You need an approved barrier, and your barrier plan (fences, gates, alarms, or an automatic cover) must be shown on your permit drawings. Ada County requires a signed acknowledgment that the barrier meets the 2018 ISPSC.

Can a homeowner pull their own pool permit in Boise?

The application requires an Idaho contractor registration number unless the applicant declares an exemption under Idaho Code 54-5205, which can include certain homeowners. Check with the city before you apply.

How much does a pool permit cost in Boise?

Boise calculates the building permit fee from the project’s declared valuation using its fee schedule, plus residential plan review at 20 percent of the building permit fee. Trade permits are separate. The Permit Counter at (208) 608-7070 can help with fee questions.

Ready to start your Boise pool?

The best time to start permitting is before you want to dig. Book a free design consultation with Maverick Pools, and we will walk your yard, confirm your jurisdiction and any overlay reviews, and map out a design, permit, and build timeline that gets you swimming as soon as possible.

Call (208) 279-1641 or book your consultation online.