Do I need a permit to build a deck in Boise, Idaho?

Yes, in most cases you need a building permit to build a deck in Boise. The City of Boise requires a permit for any deck that is attached to the house or elevated more than 30 inches above the adjacent grade at any point. Your permit application must include a site plan showing the deck's location relative to all property lines, the house, and any easements. The site plan helps reviewers confirm that the deck meets the setback requirements for your zoning district. Decks that are detached and very low to the ground may fall under an exemption, but it is always wise to confirm with Boise's Development Services division before starting work to avoid stop-work orders or required demolition later.

What does Boise require on a residential site plan?

A residential site plan submitted to Boise's Development Services office typically needs to include: the property's legal description and address; all lot boundaries with dimensions; north arrow and scale; existing structures on the lot with their dimensions and distances from property lines; the proposed structure or improvement with its dimensions and setback distances; driveways, walkways, and access points; easements and rights-of-way; and any relevant natural features such as drainage channels or floodplain boundaries. The plan should be drawn to a standard scale, such as 1 inch equals 20 feet, and be legible when printed. Missing dimensions or an unclear scale are among the most common reasons Boise reviewers send applications back for correction.

How long does it take to get a building permit approved in Boise?

Permit review timelines in Boise vary depending on the complexity of the project and the current workload at Development Services. As of 2026, simple projects like small sheds or low decks may receive over-the-counter or expedited review in as few as 5 to 10 business days. Room additions and new accessory dwelling units typically take 3 to 6 weeks for plan review. Projects that require additional review by the Historic Preservation Commission, the floodplain administrator, or Public Works for right-of-way impacts can take longer. Submitting a complete application with an accurate site plan on the first attempt is the single most effective way to avoid delays and resubmittal cycles.

How much does a building permit cost in Boise, Idaho?

Boise building permit fees are based primarily on the estimated construction valuation of the project. The city uses a fee schedule that includes a plan review fee (typically around 65 percent of the building permit fee) and the building permit fee itself, which is calculated on a sliding scale tied to project value. A small deck or shed permit might cost a few hundred dollars in total fees, while a room addition or ADU could run into the thousands. There may also be additional fees for zoning review, right-of-way permits, or floodplain review if your project triggers those. The most current fee schedule is available through Boise's Development Services office or on the city's website.

Can I draw my own site plan in Boise, or do I need a licensed surveyor?

For most standard residential projects in Boise, you are not required to hire a licensed land surveyor or engineer to prepare the site plan. Homeowners and contractors can draw their own site plans as long as the plan is accurate, drawn to scale, and includes all required information such as lot dimensions, setbacks, and the locations of existing and proposed structures. However, if you do not have a recent survey of your property, you may need to obtain one to confirm your lot boundaries before drawing the plan. For complex projects, those in overlay districts, or ADUs, Boise may require stamped drawings from a licensed architect or engineer for structural components, even if the site plan itself does not need to be professionally sealed.

What are the setback requirements for a residential property in Boise?

Setback requirements in Boise depend on your specific zoning district, but typical single-family residential zones require a front setback of 20 to 25 feet from the front property line, interior side setbacks of 5 feet on each side, a street-side setback of 15 to 20 feet on corner lots, and a rear setback of 15 to 20 feet. Accessory structures like sheds and detached garages are often allowed closer to rear and side property lines, sometimes as close as 3 feet, depending on the zone and the structure's height. Properties in overlay districts such as the Hillside and Foothills Overlay may have additional restrictions. Always verify your exact setbacks using the Boise Unified Development Code or by contacting Development Services directly.

Where do I submit a permit application in Boise, Idaho?

As of 2026, Boise's primary permit submission method is through the city's online eTRAKiT portal, which allows homeowners and contractors to upload application documents, pay fees, and track review status digitally. In-person submissions are also accepted at Boise City Hall, located at 150 N. Capitol Blvd., Boise, ID 83702, during regular business hours. The Planning and Development Services counter can answer questions about what documents are required before you submit. For projects that are straightforward, such as small decks or sheds, over-the-counter review may be available, meaning a reviewer can look at your application while you wait, potentially issuing the permit the same day.

What happens if I build without a permit in Boise?

Building without a required permit in Boise can lead to serious consequences. If unpermitted work is discovered, the city can issue a stop-work order requiring all construction to halt immediately. You may be required to obtain a permit after the fact, which typically involves a penalty fee (often double the standard permit fee) and may require portions of the completed work to be opened up for inspection. In some cases, work that cannot be inspected or that does not meet code may need to be removed entirely. Unpermitted structures can also create problems when you sell your home, as title companies and buyers' inspectors routinely flag unpermitted additions. It is always less costly to get the permit first.

What are the ADU rules in Boise, and do I need a site plan?

Boise has expanded its accessory dwelling unit (ADU) allowances in recent years to help address housing demand. As of 2026, ADUs are permitted in most residential zoning districts, including attached ADUs, detached ADUs, and garage conversions. All ADUs require a full building permit, which includes a site plan showing the ADU's location on the lot, its setbacks from all property lines, and its relationship to the primary dwelling. ADUs must meet the setback requirements of the applicable zone, and there are limits on size relative to the primary home. Owner-occupancy requirements have been relaxed in Boise, making ADUs an increasingly popular option for rental income or multigenerational living.

Does my Boise property fall in a floodplain, and how does that affect my permit?

Some properties in Boise, particularly those near the Boise River, Cottonwood Creek, and other waterways, fall within FEMA-designated Special Flood Hazard Areas (SFHAs). If your property is in a floodplain, any development, including additions, grading, fill, or new structures, requires a floodplain development permit from the city in addition to any standard building permits. Projects in SFHAs must meet elevation requirements and may require a FEMA Elevation Certificate. You can check your flood zone status using the FEMA Flood Map Service Center at msc.fema.gov. Boise's Development Services staff can also help you determine whether your project triggers floodplain review and what additional documentation will be needed.

Site Plan Requirements in Boise, ID (Permit Guide)

By Site Plan Creator Team • May 31, 2026

Boise, Idaho homeowners planning residential projects need to understand local site plan and permit requirements before breaking ground. This guide covers everything from typical permit triggers and setback rules to where to submit your application and how long approval takes in Boise.

Site plan requirements for residential properties in Boise, Idaho

Residential Site Plans and Permits in Boise, Idaho

Boise has grown rapidly over the past decade, and with that growth has come an increasingly active residential construction and renovation scene. Whether you are adding a backyard deck overlooking the Boise Foothills, converting a garage into an accessory dwelling unit, or simply installing a new fence along your property line, the City of Boise requires property owners to navigate a permit process that almost always starts with a site plan. Understanding what is required, where to submit, and how to avoid common pitfalls can save you weeks of back-and-forth with the city's Development Services division.

What Is a Residential Site Plan and Why Does Boise Require One?

A residential site plan is a scaled, bird's-eye drawing of your property that shows the lot boundaries, existing structures, proposed construction, setbacks, easements, driveways, and other relevant site features. Boise requires site plans because the city's planning and building staff need to verify that your project complies with the applicable zoning district, the Idaho Building Code, and any overlay requirements before a permit is issued.

Without an accurate site plan, reviewers cannot confirm that a proposed structure respects required setbacks, does not encroach on drainage easements, and fits within impervious-surface limits that protect Boise's stormwater system. A complete, clearly drawn site plan is often the single most important document in a residential permit application.

Common Residential Permit Triggers in Boise

Many homeowners are surprised by how many common projects require a permit in Boise. The following improvements almost always trigger a building or zoning permit:

Decks and patios: Any deck attached to the house or elevated more than 30 inches above grade requires a building permit.
Sheds and accessory structures: Structures larger than 120 square feet typically require a permit. Smaller sheds may still need to meet setback requirements.
Swimming pools and hot tubs: In-ground and above-ground pools deeper than 24 inches require a permit and must meet barrier and fencing requirements.
Fences: Fences over 6 feet in height require a permit. Front-yard fences have additional height restrictions depending on zoning district.
Room additions: Any addition to the footprint of a home requires both a building permit and a site plan showing the new footprint relative to lot lines.
Accessory Dwelling Units (ADUs): Boise has expanded ADU allowances in recent years, but all ADUs require a full permit package including a site plan, floor plans, and elevations.
Driveways: New driveways or significant expansions that connect to a public street require a right-of-way permit from the city's Public Works department in addition to any applicable building permits.
HVAC, electrical, and plumbing: Mechanical system replacements or new installations require separate trade permits, though a site plan is not always required for these alone.

Boise Zoning and Local Considerations

Boise uses a Unified Development Code (UDC) that organizes the city into residential zones ranging from R-1A (low-density) through higher-density R zones and mixed-use districts. Each zone has its own development standards, so the first step before designing any project is confirming your property's zoning designation on the City of Boise's online mapping portal.

A few local quirks are worth noting:

Hillside and foothills overlay: Properties in or near the Boise Foothills may fall under the Hillside and Foothills Overlay, which imposes additional grading, drainage, and wildfire-interface standards.
Floodplain considerations: Portions of Boise near the Boise River and its tributaries fall within FEMA-designated Special Flood Hazard Areas. Projects in these areas require a floodplain development permit and must meet elevation requirements. You can check your flood zone status on the FEMA Flood Map Service Center.
Historic districts: Boise's North End and other historic neighborhoods have design review requirements administered by the Historic Preservation Commission. Exterior changes in these areas may require a Certificate of Appropriateness before a building permit is issued.
HOA restrictions: Many Boise subdivisions have homeowners association rules that are stricter than city code. Always check your CC&Rs in addition to city requirements.
Impervious surface limits: Some residential zones cap the total impervious surface coverage on a lot, which affects how large a driveway, patio, or addition can be.

Typical Setback Requirements in Boise

Setbacks define the minimum distance a structure must be from a property line, right-of-way, or other feature. In Boise, setbacks vary by zoning district, but the following ranges are typical for standard single-family residential zones:

Front setback: 20 to 25 feet from the front property line (or from the right-of-way line)
Side setback (interior lots): 5 feet on each side, though some zones require more
Side setback (street-facing side on corner lots): 15 to 20 feet
Rear setback: 15 to 20 feet, depending on zone
Accessory structures: Often allowed closer to rear and side property lines, sometimes as close as 3 feet, but this varies by zone and structure type

Always verify your specific setbacks in the Boise UDC or by contacting Development Services directly, as overlay districts and lot-specific conditions can change these numbers.

The Boise Permit Submission Process

Boise's Development Services division handles residential building and zoning permits. As of 2026, the city uses an online portal called Boise's eTRAKiT system for most permit applications. Here is how the process generally works:

Confirm zoning and requirements: Look up your parcel on the city's mapping tools and review the applicable UDC standards.
Prepare your application package: This typically includes a completed permit application, a site plan, floor plans, and any required supporting documents (energy calculations, structural details, etc.).
Submit online or in person: Most residential permits can be submitted through the eTRAKiT portal. In-person submissions are accepted at Boise City Hall, 150 N. Capitol Blvd.
Pay the plan review fee: Fees are based on project valuation. Simple projects may qualify for over-the-counter review; larger projects enter a standard review queue.
Respond to comments: If reviewers have questions or require corrections, you will receive a comment letter. Respond promptly to avoid delays.
Permit issuance and inspections: Once approved, your permit is issued and you can begin work. Required inspections must be scheduled at key milestones (foundation, framing, final, etc.).

Plan review timelines in Boise vary by project complexity. Simple accessory structures or decks may be reviewed in 5 to 10 business days. Room additions and ADUs typically take 3 to 6 weeks. Complex projects or those requiring Historic Preservation or floodplain review can take longer. Submitting a complete, accurate application is the best way to avoid delays.

Common Reasons Boise Permit Applications Get Rejected

Development Services staff commonly flag applications for the following issues:

Missing or inaccurate site plan: The site plan does not show all existing structures, or dimensions are missing or inconsistent.
Setback violations: The proposed structure does not meet the required setbacks for the zoning district.
Incomplete application: Missing signatures, missing project valuation, or missing supporting documents.
Unpermitted existing work: Reviewers discover prior unpermitted construction on the property during the review.
Floodplain or overlay issues: The project is in an overlay district and does not address the additional requirements.
Scale and legibility: The site plan is not drawn to a recognizable scale or is too small to read clearly.

Addressing these issues before submission, rather than after receiving a rejection letter, can save weeks of project time.

Start Your Boise Site Plan with Site Plan Creator

Creating a professional, permit-ready site plan does not have to be complicated or expensive. Site Plan Creator is an easy-to-use online tool designed specifically for homeowners, contractors, and small builders who need accurate, scaled site plans without the cost of hiring a surveyor or architect for the drawing alone. You can input your lot dimensions, place existing and proposed structures, add setback lines, and export a clean PDF ready for submission to Boise's Development Services office. Whether your project is a simple backyard shed or a full ADU, Site Plan Creator helps you get it right the first time.

Frequently Asked Questions

Do I need a permit to build a deck in Boise, Idaho?: Yes, in most cases you need a building permit to build a deck in Boise. The City of Boise requires a permit for any deck that is attached to the house or elevated more than 30 inches above the adjacent grade at any point. Your permit application must include a site plan showing the deck's location relative to all property lines, the house, and any easements. The site plan helps reviewers confirm that the deck meets the setback requirements for your zoning district. Decks that are detached and very low to the ground may fall under an exemption, but it is always wise to confirm with Boise's Development Services division before starting work to avoid stop-work orders or required demolition later.
What does Boise require on a residential site plan?: A residential site plan submitted to Boise's Development Services office typically needs to include: the property's legal description and address; all lot boundaries with dimensions; north arrow and scale; existing structures on the lot with their dimensions and distances from property lines; the proposed structure or improvement with its dimensions and setback distances; driveways, walkways, and access points; easements and rights-of-way; and any relevant natural features such as drainage channels or floodplain boundaries. The plan should be drawn to a standard scale, such as 1 inch equals 20 feet, and be legible when printed. Missing dimensions or an unclear scale are among the most common reasons Boise reviewers send applications back for correction.
How long does it take to get a building permit approved in Boise?: Permit review timelines in Boise vary depending on the complexity of the project and the current workload at Development Services. As of 2026, simple projects like small sheds or low decks may receive over-the-counter or expedited review in as few as 5 to 10 business days. Room additions and new accessory dwelling units typically take 3 to 6 weeks for plan review. Projects that require additional review by the Historic Preservation Commission, the floodplain administrator, or Public Works for right-of-way impacts can take longer. Submitting a complete application with an accurate site plan on the first attempt is the single most effective way to avoid delays and resubmittal cycles.
How much does a building permit cost in Boise, Idaho?: Boise building permit fees are based primarily on the estimated construction valuation of the project. The city uses a fee schedule that includes a plan review fee (typically around 65 percent of the building permit fee) and the building permit fee itself, which is calculated on a sliding scale tied to project value. A small deck or shed permit might cost a few hundred dollars in total fees, while a room addition or ADU could run into the thousands. There may also be additional fees for zoning review, right-of-way permits, or floodplain review if your project triggers those. The most current fee schedule is available through Boise's Development Services office or on the city's website.
Can I draw my own site plan in Boise, or do I need a licensed surveyor?: For most standard residential projects in Boise, you are not required to hire a licensed land surveyor or engineer to prepare the site plan. Homeowners and contractors can draw their own site plans as long as the plan is accurate, drawn to scale, and includes all required information such as lot dimensions, setbacks, and the locations of existing and proposed structures. However, if you do not have a recent survey of your property, you may need to obtain one to confirm your lot boundaries before drawing the plan. For complex projects, those in overlay districts, or ADUs, Boise may require stamped drawings from a licensed architect or engineer for structural components, even if the site plan itself does not need to be professionally sealed.
What are the setback requirements for a residential property in Boise?: Setback requirements in Boise depend on your specific zoning district, but typical single-family residential zones require a front setback of 20 to 25 feet from the front property line, interior side setbacks of 5 feet on each side, a street-side setback of 15 to 20 feet on corner lots, and a rear setback of 15 to 20 feet. Accessory structures like sheds and detached garages are often allowed closer to rear and side property lines, sometimes as close as 3 feet, depending on the zone and the structure's height. Properties in overlay districts such as the Hillside and Foothills Overlay may have additional restrictions. Always verify your exact setbacks using the Boise Unified Development Code or by contacting Development Services directly.
Where do I submit a permit application in Boise, Idaho?: As of 2026, Boise's primary permit submission method is through the city's online eTRAKiT portal, which allows homeowners and contractors to upload application documents, pay fees, and track review status digitally. In-person submissions are also accepted at Boise City Hall, located at 150 N. Capitol Blvd., Boise, ID 83702, during regular business hours. The Planning and Development Services counter can answer questions about what documents are required before you submit. For projects that are straightforward, such as small decks or sheds, over-the-counter review may be available, meaning a reviewer can look at your application while you wait, potentially issuing the permit the same day.
What happens if I build without a permit in Boise?: Building without a required permit in Boise can lead to serious consequences. If unpermitted work is discovered, the city can issue a stop-work order requiring all construction to halt immediately. You may be required to obtain a permit after the fact, which typically involves a penalty fee (often double the standard permit fee) and may require portions of the completed work to be opened up for inspection. In some cases, work that cannot be inspected or that does not meet code may need to be removed entirely. Unpermitted structures can also create problems when you sell your home, as title companies and buyers' inspectors routinely flag unpermitted additions. It is always less costly to get the permit first.
What are the ADU rules in Boise, and do I need a site plan?: Boise has expanded its accessory dwelling unit (ADU) allowances in recent years to help address housing demand. As of 2026, ADUs are permitted in most residential zoning districts, including attached ADUs, detached ADUs, and garage conversions. All ADUs require a full building permit, which includes a site plan showing the ADU's location on the lot, its setbacks from all property lines, and its relationship to the primary dwelling. ADUs must meet the setback requirements of the applicable zone, and there are limits on size relative to the primary home. Owner-occupancy requirements have been relaxed in Boise, making ADUs an increasingly popular option for rental income or multigenerational living.
Does my Boise property fall in a floodplain, and how does that affect my permit?: Some properties in Boise, particularly those near the Boise River, Cottonwood Creek, and other waterways, fall within FEMA-designated Special Flood Hazard Areas (SFHAs). If your property is in a floodplain, any development, including additions, grading, fill, or new structures, requires a floodplain development permit from the city in addition to any standard building permits. Projects in SFHAs must meet elevation requirements and may require a FEMA Elevation Certificate. You can check your flood zone status using the FEMA Flood Map Service Center at msc.fema.gov. Boise's Development Services staff can also help you determine whether your project triggers floodplain review and what additional documentation will be needed.

How to Create a Site Plan in Boise

Confirm Your Zoning and Requirements: Before drawing anything, look up your parcel on the City of Boise's online mapping tools to confirm your zoning district and any applicable overlays, such as the Hillside and Foothills Overlay or a historic district. Review the Boise Unified Development Code for your zone's setbacks, height limits, and impervious surface maximums. Contact Development Services at (208) 384-3830 if you have questions about what your specific project requires.
Gather Your Property Information: Collect your property's legal description, lot dimensions, and a copy of any existing survey. If you do not have a current survey, you may need to hire a licensed land surveyor to establish your lot boundaries accurately before you can draw a compliant site plan. Also note the location of any easements, drainage features, or rights-of-way that cross your property, as these must appear on your site plan.
Draw Your Site Plan to Scale: Create a scaled site plan that shows all lot boundaries with dimensions, existing structures and their distances from property lines, the proposed project with its dimensions and setbacks, driveways, north arrow, and scale bar. Use a tool like Site Plan Creator (siteplancreator.com) to produce a clean, accurate, permit-ready drawing. Make sure every dimension is labeled and the scale is clearly noted on the plan.
Prepare and Submit Your Application Package: Assemble your complete application package, including the permit application form, your site plan, floor plans and elevations if required, and any supplemental documents such as energy compliance forms or structural calculations. Submit through Boise's eTRAKiT online portal or in person at City Hall, 150 N. Capitol Blvd. Pay the plan review fee at the time of submission. Double-check that all required fields are completed to avoid an immediate rejection.
Respond to Reviewer Comments: After submission, a Development Services plan reviewer will examine your application. If corrections are needed, you will receive a comment letter listing the required changes. Respond promptly and completely to each comment, revising your site plan or other documents as needed and resubmitting through the same portal. Quick, thorough responses to comments are the best way to keep your project on schedule.
Obtain Your Permit and Schedule Inspections: Once your application is approved, Boise will issue your building permit. Post the permit on site as required and begin construction only after the permit is in hand. Schedule all required inspections through the city's inspection scheduling system at key milestones, such as footing, framing, and final inspection. Do not cover work that has not yet been inspected, as this can lead to costly delays or required demolition.