Do I need a permit to build an ADU in Pomona, CA?

Yes, you need a building permit to construct an Accessory Dwelling Unit (ADU) or Junior ADU (JADU) in Pomona. California state law requires cities to process ministerial ADU applications within 60 days when the project meets objective zoning standards, but you still must submit a complete application that includes a scaled site plan, floor plans, and elevation drawings. Your site plan must show the ADU's location on the lot, setbacks from property lines (as little as 4 feet for detached ADUs under state law), any required parking replacement, and the location of utility connections. Pomona has been one of the more active ADU markets in Los Angeles County, and the Building and Safety Division is experienced with these applications. An accurate, complete site plan is the single most important factor in avoiding correction letters and hitting the 60-day approval window.

What are the setback requirements for residential properties in Pomona?

In Pomona's standard single-family (R-1) zoning districts, typical setback requirements are 20 to 25 feet for the front yard, 5 feet on each interior side yard, and 15 to 20 feet for the rear yard. Corner lots must maintain an additional street-side setback, usually around 10 feet. Detached ADUs benefit from California state law, which allows placement as close as 4 feet from rear and side property lines. Swimming pools are typically required to be at least 5 feet from property lines and 5 feet from the main structure's foundation. These are general ranges; your specific parcel's zoning designation, any applicable overlay zones, or a specific plan could modify these numbers. Always confirm setbacks with the Pomona Planning Division before finalizing your site plan.

How much does a building permit cost in Pomona, CA?

Permit fees in Pomona are calculated based on the valuation of the proposed work, using a fee schedule adopted by the City Council. For a typical room addition valued at around 50,000 dollars, total permit fees including plan check often range from roughly 1,000 to 2,500 dollars. ADU permits may have additional fees for planning review. Pool permits, patio cover permits, and fence permits are generally lower cost, often in the 200 to 800 dollar range depending on scope. There are also separate fees for energy compliance review (Title 24) and, in some cases, school impact fees assessed by the Pomona Unified School District for new habitable space. For an exact fee estimate, contact the Pomona Building and Safety Division at (909) 620-2181 or visit City Hall at 505 S. Garey Avenue before submitting your application.

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

For simple residential projects in Pomona, such as a small patio cover or fence, over-the-counter plan check at City Hall can result in same-day or next-day approval. More complex projects, including room additions, new detached structures, and pools, typically take 2 to 4 weeks for a first-round plan check review. ADU applications processed under California's ministerial review rules must receive a determination within 60 days of a complete application submission. If your application receives a correction letter, each resubmittal round can add another 2 to 3 weeks. Submitting a complete, accurate site plan and supporting documents the first time is the most reliable way to minimize your total approval timeline in Pomona.

What needs to be on a residential site plan in Pomona?

Pomona's Building and Safety Division expects a residential site plan to include the following elements: the lot boundaries with dimensions, a north arrow and a stated drawing scale, the location and footprint of all existing structures on the property, the location and footprint of the proposed new structure or improvement, all setback dimensions from structures to property lines, the driveway and any parking areas, utility lines and easements, and the street name and address. For ADU projects, you must also show any required replacement parking. For pools, show the equipment pad location and required fencing. For projects in wildfire hazard zones, the site plan may need to note the fire hazard severity zone designation. A clearly labeled, to-scale site plan dramatically reduces the chance of receiving a correction letter from plan checkers.

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

For most standard residential permits in Pomona, including ADUs, room additions, decks, pools, and fences, you are not required to hire a licensed architect, engineer, or land surveyor to prepare the site plan itself. California law does require licensed engineers or architects to stamp structural plans for certain projects, but the site plan component can typically be prepared by the homeowner or contractor as long as it is drawn to scale and contains all required information. Using a tool like Site Plan Creator at siteplancreator.com makes it straightforward to produce a professional, permit-ready site plan without specialized software. That said, if your lot has unusual conditions, disputed boundaries, or you need a legal survey for financing purposes, hiring a licensed land surveyor is advisable.

What happens if I build without a permit in Pomona, CA?

Building without a required permit in Pomona is a violation of the California Building Code and the Pomona Municipal Code. If unpermitted work is discovered, the city can issue a stop-work order immediately halting construction. You may also receive a Notice of Violation requiring you to either obtain a retroactive permit (sometimes called a permit for work already done) or remove the unpermitted structure entirely. Retroactive permits often require more extensive inspections and may involve higher fees, including investigation fees that can be double or triple the standard permit cost. Unpermitted work can also create serious problems when you sell your home, as it must be disclosed to buyers and may affect your homeowner's insurance coverage. It is always less expensive and less stressful to pull the permit before work begins.

Do I need a permit to install a fence in Pomona?

In Pomona, fences up to 6 feet tall in the rear and side yards generally do not require a building permit, but fences taller than 6 feet always require one. In the required front yard setback area, fences are typically limited to 3.5 feet in height without a permit. Masonry or concrete block walls may have additional structural requirements regardless of height. If your property is in a homeowners association (HOA), you will also need HOA approval before installing or replacing a fence, independent of the city permit process. Corner lot properties face additional visibility triangle restrictions near intersections that limit fence height near the street. When in doubt, call the Pomona Building and Safety Division at (909) 620-2181 to confirm whether your specific fence project requires a permit.

Where do I submit a permit application in Pomona, CA?

Permit applications for residential projects in Pomona are submitted to the Building and Safety Division located at City Hall, 505 S. Garey Avenue, Pomona, CA 91766. The division's public counter is open during regular business hours on weekdays. As of 2026, Pomona has been expanding its electronic plan review capabilities, so some permit types may be eligible for online or email submission. It is best to check the city's official website or call (909) 620-2181 before your visit to confirm current submission options and required documents for your specific project type. Bringing a complete application package, including your site plan, floor plans, and any required supporting documents, on your first visit will help you avoid multiple trips to City Hall.

Are there special permit rules for properties in Pomona's historic district?

Yes. Properties located within Pomona's Lincoln Park Historic District or other locally designated historic resources are subject to additional review beyond the standard building permit process. Exterior alterations, additions, and new construction visible from the street may require a Certificate of Appropriateness from the Pomona Historic Preservation Commission before a building permit can be issued. This review is intended to ensure that new work is compatible with the historic character of the neighborhood in terms of materials, scale, and architectural style. The historic review process can add several weeks to your overall permit timeline, so it is important to contact the Pomona Planning Division early in your project planning to determine whether your property is subject to historic overlay requirements.

Site Plan Requirements in Pomona, CA (Permit Guide)

By Site Plan Creator Team • August 7, 2026

Pomona, California homeowners need a properly prepared site plan for most residential building permits, from ADUs and room additions to pools and fences. This guide explains what Pomona requires, typical setbacks, the permit submission process, and how Site Plan Creator can help you get started quickly.

Site plan requirements for residential properties in Pomona, California

Residential Site Plans and Building Permits in Pomona, CA

Pomona is one of the largest cities in Los Angeles County, a historic Inland Valley community known for its diverse neighborhoods, older housing stock, and a growing wave of ADU construction and home improvement activity. Whether you are converting a garage into a rental unit, adding a covered patio, or putting in a new swimming pool, the City of Pomona requires a building permit and, in most cases, a residential site plan before any work can legally begin. Getting that site plan right from the start is the single most effective way to avoid costly delays, correction letters, and re-submission fees.

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

A residential site plan is a scaled, bird's-eye drawing of your property that shows the lot boundaries, existing structures, proposed new construction, driveways, easements, setbacks, and relevant dimensions. The City of Pomona's Building and Safety Division uses your site plan to confirm that a proposed project complies with the city's zoning code, the California Building Code (CBC), and any applicable state or local ordinances before a permit is issued.

Without an accurate site plan, plan checkers cannot verify setbacks, lot coverage, or whether a structure encroaches on an easement. Submitting an incomplete or inaccurate site plan is the leading cause of permit application rejections in Pomona, adding weeks or even months to a project timeline.

Which Residential Projects Require a Permit (and a Site Plan) in Pomona?

The following common residential improvements generally require a building permit and an accompanying site plan in Pomona:

Accessory Dwelling Units (ADUs) and Junior ADUs (JADUs): California state law mandates streamlined ADU permitting, but Pomona still requires a complete site plan showing the ADU's location, setbacks, and parking impacts.
Room additions and garage conversions: Any addition of conditioned or habitable space triggers a full permit with site plan.
Detached garages and workshops: New detached structures over 120 square feet require a permit.
Swimming pools and spas: Both in-ground and above-ground pools over 18 inches deep require a permit and site plan showing fencing, equipment location, and setbacks.
Decks and patio covers: Attached patio covers and raised decks generally require permits; freestanding patio covers over 200 square feet typically do as well.
Fences: Fences exceeding 6 feet in height (or 3.5 feet in required front yard setback areas) require a permit in Pomona.
Driveways and impervious surfaces: New or significantly expanded driveways may require a permit and must comply with stormwater management requirements under the Los Angeles County MS4 permit.
Sheds: Prefabricated or site-built sheds over 120 square feet require a permit.

If you are unsure whether your specific project triggers a permit, the City of Pomona Building and Safety Division can clarify, or you can review the California Building Code at the International Code Council website.

Local Zoning Considerations and Quirks in Pomona

Pomona's zoning landscape has several features that homeowners should understand before drafting a site plan:

Older housing stock and nonconforming lots: Many Pomona neighborhoods were platted in the early twentieth century, and some lots do not conform to current zoning standards for lot width or area. If your lot is legally nonconforming, you may face additional scrutiny or conditions when applying for permits for expansions.

Historic districts: Pomona has a designated historic district centered around the Lincoln Park neighborhood. Projects in or near historic districts may require review by the Pomona Historic Preservation Commission in addition to standard building permit review, which can extend timelines significantly.

ADU-friendly environment: California's ADU laws (SB 9, AB 2221, and related legislation) have made Pomona one of the more active ADU markets in the San Gabriel Valley. The city is required by state law to approve ministerial ADU applications that meet objective standards within 60 days. A clean, accurate site plan is critical to hitting that deadline.

Wildfire Hazard Severity Zones: Portions of Pomona near the foothills and the eastern edge of the city fall within State Responsibility Areas or Local Agency Very High Fire Hazard Severity Zones. Projects in these areas must comply with Chapter 7A of the California Building Code, including ember-resistant venting and ignition-resistant construction materials.

Stormwater and impervious surface limits: Los Angeles County's Low Impact Development (LID) requirements apply within Pomona. Large additions or new impervious surfaces may require a stormwater management plan or on-site infiltration measures.

Typical Setback Requirements in Pomona

Setbacks vary by zoning district, but the following ranges represent typical residential (R-1 and R-2) requirements in Pomona:

Front yard setback: 20 to 25 feet from the front property line
Side yard setback: 5 feet minimum on each side for single-family zones (interior lots); corner lots have additional street-side setback requirements, typically 10 feet
Rear yard setback: 15 to 20 feet for primary structures
Accessory structures: ADUs detached from the main house may be placed as close as 4 feet from the rear and side property lines under California state law
Pools: Typically must be set back at least 5 feet from property lines and 5 feet from the house foundation

Always verify setbacks for your specific parcel and zoning designation with the Pomona Planning Division, as overlay zones, specific plans, and nonconforming conditions can alter these numbers.

The Permit Submission Process in Pomona

Here is a general overview of how residential permit applications work in Pomona as of 2026:

Prepare your documents: Assemble your site plan, floor plans, elevation drawings, and any required engineering or energy compliance (Title 24) documents.
Submit your application: Pomona's Building and Safety Division accepts permit applications at City Hall (505 S. Garey Avenue, Pomona, CA 91766). The city has also been expanding its online submission options; check the city's official portal for the latest e-permit capabilities.
Plan check review: For most residential projects, the initial over-the-counter plan check takes 1 to 3 business days for straightforward projects. Complex projects, ADUs, or anything requiring Planning Division sign-off may take 3 to 6 weeks for a first-round review.
Corrections and resubmittal: If corrections are required, you will receive a correction letter. Addressing corrections promptly and completely is essential to avoiding a second or third round of review.
Permit issuance and inspections: Once approved, you pay the permit fee, receive your permit, and schedule required inspections at key construction milestones.

For state-level code reference, the California Department of Housing and Community Development publishes the latest ADU guidelines and building standards.

Common Reasons Permit Applications Get Rejected in Pomona

Based on the types of issues that consistently slow down residential permits in cities like Pomona, watch out for these frequent problems:

Site plan is not drawn to scale or lacks a stated scale bar
Missing or incorrect setback dimensions from proposed structures to property lines
Property lines are estimated rather than based on a recorded plat or survey
Lot coverage calculation is missing or exceeds the zoning maximum
ADU site plan does not show required parking replacement (when applicable)
No notation of existing utilities, easements, or right-of-way lines
Wildfire zone compliance documentation is absent for hillside or foothill parcels
Energy compliance (Title 24) calculations are missing for additions over 500 square feet

Get Your Pomona Site Plan Done Right with Site Plan Creator

Preparing an accurate, professional-quality site plan does not have to mean hiring an expensive drafter or architect for a straightforward residential project. Site Plan Creator is a fast, easy-to-use online tool designed specifically for homeowners, contractors, and small builders who need permit-ready site plans without the high cost or long wait times of traditional drafting services. You can enter your property dimensions, place existing and proposed structures, add setback lines, and export a clean, scaled PDF that meets the formatting expectations of Pomona's Building and Safety Division. Start your project today at siteplancreator.com and move your Pomona permit application forward with confidence.

Frequently Asked Questions

Do I need a permit to build an ADU in Pomona, CA?: Yes, you need a building permit to construct an Accessory Dwelling Unit (ADU) or Junior ADU (JADU) in Pomona. California state law requires cities to process ministerial ADU applications within 60 days when the project meets objective zoning standards, but you still must submit a complete application that includes a scaled site plan, floor plans, and elevation drawings. Your site plan must show the ADU's location on the lot, setbacks from property lines (as little as 4 feet for detached ADUs under state law), any required parking replacement, and the location of utility connections. Pomona has been one of the more active ADU markets in Los Angeles County, and the Building and Safety Division is experienced with these applications. An accurate, complete site plan is the single most important factor in avoiding correction letters and hitting the 60-day approval window.
What are the setback requirements for residential properties in Pomona?: In Pomona's standard single-family (R-1) zoning districts, typical setback requirements are 20 to 25 feet for the front yard, 5 feet on each interior side yard, and 15 to 20 feet for the rear yard. Corner lots must maintain an additional street-side setback, usually around 10 feet. Detached ADUs benefit from California state law, which allows placement as close as 4 feet from rear and side property lines. Swimming pools are typically required to be at least 5 feet from property lines and 5 feet from the main structure's foundation. These are general ranges; your specific parcel's zoning designation, any applicable overlay zones, or a specific plan could modify these numbers. Always confirm setbacks with the Pomona Planning Division before finalizing your site plan.
How much does a building permit cost in Pomona, CA?: Permit fees in Pomona are calculated based on the valuation of the proposed work, using a fee schedule adopted by the City Council. For a typical room addition valued at around 50,000 dollars, total permit fees including plan check often range from roughly 1,000 to 2,500 dollars. ADU permits may have additional fees for planning review. Pool permits, patio cover permits, and fence permits are generally lower cost, often in the 200 to 800 dollar range depending on scope. There are also separate fees for energy compliance review (Title 24) and, in some cases, school impact fees assessed by the Pomona Unified School District for new habitable space. For an exact fee estimate, contact the Pomona Building and Safety Division at (909) 620-2181 or visit City Hall at 505 S. Garey Avenue before submitting your application.
How long does it take to get a building permit approved in Pomona?: For simple residential projects in Pomona, such as a small patio cover or fence, over-the-counter plan check at City Hall can result in same-day or next-day approval. More complex projects, including room additions, new detached structures, and pools, typically take 2 to 4 weeks for a first-round plan check review. ADU applications processed under California's ministerial review rules must receive a determination within 60 days of a complete application submission. If your application receives a correction letter, each resubmittal round can add another 2 to 3 weeks. Submitting a complete, accurate site plan and supporting documents the first time is the most reliable way to minimize your total approval timeline in Pomona.
What needs to be on a residential site plan in Pomona?: Pomona's Building and Safety Division expects a residential site plan to include the following elements: the lot boundaries with dimensions, a north arrow and a stated drawing scale, the location and footprint of all existing structures on the property, the location and footprint of the proposed new structure or improvement, all setback dimensions from structures to property lines, the driveway and any parking areas, utility lines and easements, and the street name and address. For ADU projects, you must also show any required replacement parking. For pools, show the equipment pad location and required fencing. For projects in wildfire hazard zones, the site plan may need to note the fire hazard severity zone designation. A clearly labeled, to-scale site plan dramatically reduces the chance of receiving a correction letter from plan checkers.
Can I draw my own site plan in Pomona, or do I need a licensed architect or surveyor?: For most standard residential permits in Pomona, including ADUs, room additions, decks, pools, and fences, you are not required to hire a licensed architect, engineer, or land surveyor to prepare the site plan itself. California law does require licensed engineers or architects to stamp structural plans for certain projects, but the site plan component can typically be prepared by the homeowner or contractor as long as it is drawn to scale and contains all required information. Using a tool like Site Plan Creator at siteplancreator.com makes it straightforward to produce a professional, permit-ready site plan without specialized software. That said, if your lot has unusual conditions, disputed boundaries, or you need a legal survey for financing purposes, hiring a licensed land surveyor is advisable.
What happens if I build without a permit in Pomona, CA?: Building without a required permit in Pomona is a violation of the California Building Code and the Pomona Municipal Code. If unpermitted work is discovered, the city can issue a stop-work order immediately halting construction. You may also receive a Notice of Violation requiring you to either obtain a retroactive permit (sometimes called a permit for work already done) or remove the unpermitted structure entirely. Retroactive permits often require more extensive inspections and may involve higher fees, including investigation fees that can be double or triple the standard permit cost. Unpermitted work can also create serious problems when you sell your home, as it must be disclosed to buyers and may affect your homeowner's insurance coverage. It is always less expensive and less stressful to pull the permit before work begins.
Do I need a permit to install a fence in Pomona?: In Pomona, fences up to 6 feet tall in the rear and side yards generally do not require a building permit, but fences taller than 6 feet always require one. In the required front yard setback area, fences are typically limited to 3.5 feet in height without a permit. Masonry or concrete block walls may have additional structural requirements regardless of height. If your property is in a homeowners association (HOA), you will also need HOA approval before installing or replacing a fence, independent of the city permit process. Corner lot properties face additional visibility triangle restrictions near intersections that limit fence height near the street. When in doubt, call the Pomona Building and Safety Division at (909) 620-2181 to confirm whether your specific fence project requires a permit.
Where do I submit a permit application in Pomona, CA?: Permit applications for residential projects in Pomona are submitted to the Building and Safety Division located at City Hall, 505 S. Garey Avenue, Pomona, CA 91766. The division's public counter is open during regular business hours on weekdays. As of 2026, Pomona has been expanding its electronic plan review capabilities, so some permit types may be eligible for online or email submission. It is best to check the city's official website or call (909) 620-2181 before your visit to confirm current submission options and required documents for your specific project type. Bringing a complete application package, including your site plan, floor plans, and any required supporting documents, on your first visit will help you avoid multiple trips to City Hall.
Are there special permit rules for properties in Pomona's historic district?: Yes. Properties located within Pomona's Lincoln Park Historic District or other locally designated historic resources are subject to additional review beyond the standard building permit process. Exterior alterations, additions, and new construction visible from the street may require a Certificate of Appropriateness from the Pomona Historic Preservation Commission before a building permit can be issued. This review is intended to ensure that new work is compatible with the historic character of the neighborhood in terms of materials, scale, and architectural style. The historic review process can add several weeks to your overall permit timeline, so it is important to contact the Pomona Planning Division early in your project planning to determine whether your property is subject to historic overlay requirements.

How to Create a Site Plan in Pomona

Confirm Your Permit Requirements: Before drawing anything, contact the City of Pomona Building and Safety Division at (909) 620-2181 or visit City Hall at 505 S. Garey Avenue to confirm whether your specific project requires a building permit and site plan. Ask about your property's zoning designation, any applicable overlay zones such as wildfire hazard or historic district, and the complete list of documents required for your permit application. This step prevents wasted effort and ensures you know exactly what to prepare.
Gather Your Property Information: Collect the documents you will need to draw an accurate site plan. These typically include your property's recorded plat or parcel map (available from the Los Angeles County Assessor's office), a current survey if available, and any existing building plans or permits on file with the city. Note your lot dimensions, the location of existing structures, utility easements, and the distance from each structure to each property line. Accurate measurements at this stage are critical to producing a site plan that passes plan check on the first submission.
Create Your Scaled Site Plan: Use Site Plan Creator at siteplancreator.com to draw a professional, to-scale site plan that meets Pomona's requirements. Place your lot boundaries, existing structures, proposed new construction, setback lines, driveways, and utility locations on the plan. Add a north arrow, a scale bar, your property address, and all required dimensions. Export a clean PDF ready for submission. For projects in wildfire hazard zones or historic districts, note any relevant designations directly on the plan or in a project description sheet.
Assemble and Submit Your Application: Compile your complete permit application package, including your scaled site plan, floor plans, elevation drawings, Title 24 energy compliance documentation (if required for your project), and any structural engineering plans. Submit the package to the Pomona Building and Safety Division at City Hall. Check the city's website in advance to confirm whether electronic submission is available for your permit type in 2026. Pay the plan check fee at the time of submission and retain your receipt and application tracking number.
Respond to Corrections and Obtain Your Permit: If the plan checker issues a correction letter, review each comment carefully and revise your site plan and supporting documents to address every item before resubmitting. Incomplete responses to correction letters are the most common cause of multiple review cycles. Once all corrections are resolved, pay the remaining permit fees, receive your issued permit, post it visibly at the job site, and schedule your required inspections with the Building and Safety Division before covering any work that needs to be inspected.