Do I need a permit to build a deck in St. Paul, MN?

Yes. In St. Paul, any deck that is attached to the house or raised more than 30 inches above grade requires a building permit from the Department of Safety and Inspections (DSI). You will need to submit a residential site plan showing the deck's footprint, its distance from all property lines, and its relationship to the existing structure. The site plan must be drawn to scale and include a north arrow. Permit fees are based on the estimated project valuation. Decks that are freestanding and low to the ground may still need a zoning review if they are close to a property line. Always check with DSI before starting any deck construction to avoid stop-work orders or fines.

What does St. Paul require on a residential site plan?

St. Paul's Department of Safety and Inspections requires that a residential site plan include the lot boundaries with dimensions, a north arrow, a scale indicator, the location and footprint of all existing structures on the property, the location and footprint of the proposed improvement, and setback measurements from the proposed structure to all property lines. For additions and ADUs, you will also need to include floor plans and elevation drawings. Projects near floodplains may require base flood elevation data. Properties in Heritage Preservation Districts may need additional documentation. Lot coverage calculations showing existing and proposed impervious or structural coverage should also be clearly labeled on the plan.

How long does it take to get a building permit approved in St. Paul?

Plan review timelines in St. Paul vary by project complexity. Simple residential projects such as decks, sheds, and fences are typically reviewed within 5 to 10 business days after a complete application is submitted. More complex projects, including home additions, detached garages, and accessory dwelling units (ADUs), can take 3 to 6 weeks. If your property is in a Heritage Preservation District, you must obtain Heritage Preservation Commission approval before DSI will complete its review, which can add additional weeks to the timeline. Floodplain review adds time as well. Submitting a complete, accurate application with a properly prepared site plan is the single best way to avoid delays.

How much does a building permit cost in St. Paul, MN?

Building permit fees in St. Paul are calculated based on the estimated construction valuation of your project. For smaller residential projects such as a deck or shed, permit and plan review fees typically range from a few hundred dollars. For larger projects such as a home addition or ADU, total fees can exceed one thousand dollars or more depending on the project's scope and valuation. There is a separate plan review fee that is charged in addition to the building permit fee. Fee schedules are published by the Department of Safety and Inspections and can be reviewed on the DSI website or by contacting the office directly at (651) 266-8989.

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

For most standard residential projects in St. Paul, you are not required to hire a licensed land surveyor or architect to prepare your site plan. Homeowners and contractors can draw their own site plans as long as the document is drawn to scale, includes all required elements such as lot dimensions, structure locations, setbacks, and a north arrow, and accurately reflects the property. However, if your project involves significant structural changes, an ADU, or a property with unusual boundaries, a professional survey or architectural drawings may be required or strongly advisable. For properties in Heritage Preservation Districts or floodplain areas, additional professional documentation is often necessary. Tools like Site Plan Creator can help you produce a permit-ready site plan without professional CAD software.

What are the setback requirements for residential properties in St. Paul?

Setback requirements in St. Paul vary by zoning district. For typical single-family residential zones, front yard setbacks are generally 25 to 30 feet from the front property line, though some older neighborhoods use the average setback of adjacent homes. Side yard setbacks for principal structures are typically 5 to 10 feet, while accessory structures may be permitted as close as 3 feet to an interior side lot line. Rear yard setbacks for principal structures are usually 25 percent of the lot depth with a minimum of 25 feet; detached accessory structures often have a reduced rear setback of 3 to 5 feet. Corner lots face additional restrictions on the street-facing side. Always verify your specific district's setbacks through the St. Paul zoning resources or DSI before finalizing your plans.

Where do I submit a site plan and permit application in St. Paul?

St. Paul accepts residential building permit applications primarily through the Department of Safety and Inspections online permit portal, accessible via the city's official website at stpaul.gov. You will create an account, complete the permit application form, upload your site plan and any required supporting documents such as floor plans or elevation drawings, and pay the applicable fees electronically. In-person submissions can also be made at the DSI office located at 375 Jackson Street, Suite 220, St. Paul, MN 55101. The online portal is the fastest option for most homeowners. If you are unsure whether your project requires a permit or what documents to include, DSI staff can be reached by phone at (651) 266-8989.

What happens if I build without a permit in St. Paul?

Building without a required permit in St. Paul is a violation of the Minnesota State Building Code and local ordinances. If discovered, the city can issue a stop-work order, requiring all construction to halt immediately. You may be required to obtain an after-the-fact permit, which often involves additional fees, inspections, and in some cases, opening up finished work so inspectors can verify code compliance. Unpermitted work can also create serious problems when you sell your home, as it may be flagged during a real estate inspection or title search. In some cases, the city may require unpermitted structures to be removed entirely. It is always far less costly and disruptive to obtain the proper permit before starting any project.

What are the ADU rules in St. Paul, MN?

St. Paul has been actively expanding ADU (accessory dwelling unit) opportunities as part of its broader housing affordability strategy. Both attached ADUs and detached ADUs are permitted in most single-family and two-family residential zoning districts. A building permit is required, and a detailed site plan must be submitted showing the ADU's location, footprint, setbacks from all property lines, lot coverage, and relationship to the primary dwelling. Detached ADUs must comply with accessory structure setback requirements, which are typically 3 to 5 feet from rear and interior side lot lines depending on the zoning district. ADUs must also meet parking requirements and utility connection standards. If the property is in a Heritage Preservation District, HPC review is required before DSI will issue the permit.

Does my St. Paul property have floodplain or historic district restrictions that affect my permit?

Possibly. St. Paul has two types of overlay considerations that can significantly affect your permit process. First, portions of the city along the Mississippi River and Trout Brook are within FEMA-designated Special Flood Hazard Areas. If your property is in one of these zones, your site plan may need to include base flood elevation data and comply with the city's floodplain management ordinance. You can check your flood zone at the FEMA Flood Map Service Center. Second, St. Paul has several Heritage Preservation Districts, including parts of Summit Hill, Irvine Park, and Cathedral Hill. Exterior changes to structures in these districts require Heritage Preservation Commission approval before DSI will issue a building permit. Check both the zoning map and the heritage preservation overlay map early in your planning process.

Site Plan Requirements in St. Paul, MN (Permit Guide)

By Site Plan Creator Team • May 20, 2026

St. Paul, Minnesota homeowners need a compliant residential site plan for most building permits, from decks and additions to ADUs and pools. This guide covers St. Paul's permit triggers, setback rules, zoning quirks, and how to submit your application successfully.

Site plan requirements for residential properties in St. Paul, Minnesota

Residential Site Plans and Building Permits in St. Paul, MN

St. Paul is one of Minnesota's oldest and most architecturally diverse cities, with neighborhoods ranging from the Victorian-era homes of Summit Avenue to the postwar bungalows of the East Side and the mixed-use corridors of Midway. That diversity makes navigating the city's building permit and site plan requirements especially important. Whether you're adding a deck to a 1920s craftsman, converting a garage into an ADU, or installing a swimming pool in Highland Park, the City of St. Paul's Department of Safety and Inspections (DSI) requires a properly prepared residential site plan before most construction projects can begin. Getting that document right from the start can mean the difference between a smooth approval and weeks of costly delays.

What Is a Residential Site Plan and Why Does St. Paul Require One?

A residential site plan is a scaled, bird's-eye drawing of your property that shows the lot boundaries, existing structures, proposed improvements, and key measurements such as setbacks from property lines. St. Paul requires site plans because the city must verify that any new construction or significant alteration complies with the St. Paul Zoning Code and the Minnesota State Building Code before a permit is issued. The site plan allows DSI plan reviewers to confirm that a proposed structure won't encroach on required setbacks, exceed lot coverage limits, or conflict with easements, drainage patterns, or neighboring properties.

Without an accurate site plan, your permit application will be returned incomplete, adding days or weeks to your project timeline.

Residential Projects That Require a Permit in St. Paul

The following improvements typically require a building permit and an accompanying site plan in St. Paul:

Decks and porches: Any deck attached to the house or raised more than 30 inches above grade requires a permit. The site plan must show the deck's footprint, distance to all property lines, and relationship to the existing structure.
Detached garages and sheds: Accessory structures larger than 200 square feet require a permit. Even smaller sheds may need zoning review if they are close to a property line.
Swimming pools and hot tubs: In-ground and above-ground pools with a water depth greater than 24 inches require a permit, along with fencing and barrier documentation on the site plan.
Fences: Fences over six feet in height require a permit. Corner lot fences and fences in front yards are subject to additional height and visibility restrictions.
Home additions: Any addition to the footprint of a home, including sunrooms, mudrooms, or expanded living space, requires a full permit with a detailed site plan.
Accessory Dwelling Units (ADUs): St. Paul has actively encouraged ADU development as part of its housing strategy. Both attached and detached ADUs require permits, and the site plan must show the ADU's location, setbacks, and relationship to the primary dwelling.
Driveways and impervious surfaces: New or expanded driveways may trigger stormwater review, particularly in areas with impervious surface limits. A site plan showing existing and proposed hard surfaces is often required.

St. Paul Zoning Quirks and Local Considerations

St. Paul's zoning landscape has several features that set it apart from suburban Twin Cities communities.

Historic districts: St. Paul contains multiple Heritage Preservation Districts, including portions of Summit Hill, Irvine Park, and the Cathedral Hill area. If your property falls within one of these districts, proposed exterior changes must be reviewed by the Heritage Preservation Commission (HPC) in addition to DSI. This can add time and documentation requirements to your project.

Floodplain properties: Portions of St. Paul along the Mississippi River and Trout Brook are located within FEMA-designated Special Flood Hazard Areas. Projects in these zones must comply with the city's floodplain management ordinance, and the site plan may need to include base flood elevation data. You can check your property's flood zone status at the FEMA Flood Map Service Center.

Impervious surface and stormwater: St. Paul's stormwater management rules limit how much of a residential lot can be covered by hard surfaces. Adding a driveway, patio, or large accessory structure may push a property over the threshold, requiring stormwater mitigation measures such as a rain garden or permeable pavement.

Lot coverage limits: Depending on the zoning district (RT1, RT2, R4, etc.), maximum lot coverage by structures ranges from roughly 30 to 50 percent. Your site plan must clearly calculate and display existing and proposed lot coverage.

Corner lots: Properties at intersections face additional restrictions on fence heights and accessory structure placement to maintain sight lines for traffic safety.

Typical Setback Requirements in St. Paul

Setbacks in St. Paul vary by zoning district, but the following ranges are common for single-family residential zones:

Front yard setback: Typically 25 to 30 feet from the front property line, though many older neighborhoods use the average setback of adjacent homes.
Side yard setback: Generally 5 to 10 feet for principal structures; accessory structures may be allowed as close as 3 feet to an interior side lot line.
Rear yard setback: Usually 25 percent of the lot depth, with a minimum of 25 feet for principal structures. Detached accessory structures often have a reduced rear setback of 3 to 5 feet.
Corner side yard setback: Typically 15 to 25 feet from the street-facing side property line.

Always verify the specific setbacks for your zoning district with DSI or through the St. Paul Planning and Economic Development zoning resources before finalizing your site plan.

How to Submit a Permit Application in St. Paul

St. Paul processes most residential building permit applications through its online portal. Here is a general overview of the process:

Determine your project scope and zoning district. Use the city's online zoning map or contact DSI to confirm your zoning designation and any overlay districts that apply.
Prepare your site plan and supporting documents. Your site plan should be drawn to scale, include a north arrow, show all lot dimensions, existing structures, proposed improvements, and setback measurements. Include floor plans and elevation drawings for additions and ADUs.
Submit your application online. St. Paul accepts permit applications through the DSI online permit portal. You will upload your site plan and supporting documents during the application process.
Pay the plan review fee. Fees are calculated based on the project's estimated valuation. Residential plan review fees typically range from a few hundred dollars for simple projects to over a thousand dollars for larger additions or ADUs.
Await plan review. Simple residential projects such as decks and sheds are often reviewed within 5 to 10 business days. More complex projects, including ADUs and additions, may take 3 to 6 weeks, particularly if Heritage Preservation or floodplain review is required.
Respond to correction requests. If the reviewer identifies issues with your site plan or documents, you will receive a correction notice. Addressing these promptly keeps your project moving.
Receive your permit and schedule inspections. Once approved, download your permit, post it at the job site, and schedule required inspections through DSI as work progresses.

Common Reasons Permit Applications Are Rejected in St. Paul

Understanding why applications fail can save you significant time:

Missing or inaccurate setback dimensions: The most frequent issue. Always measure from the property line, not the curb or sidewalk.
No scale or north arrow on the site plan: DSI reviewers need to verify distances; an unscaled sketch will not be accepted.
Lot coverage calculations not shown: Failure to document existing and proposed impervious or structural coverage is a common rejection trigger.
Incomplete project description: Vague descriptions of the work being done delay review.
Missing Heritage Preservation approval: Submitting to DSI before obtaining required HPC approval for historic district properties.
Floodplain documentation missing: For properties in flood zones, missing elevation certificates or floodplain data will halt review.

Create a Professional Site Plan with Site Plan Creator

Preparing an accurate, to-scale residential site plan no longer requires hiring a surveyor or spending hours in CAD software. Site Plan Creator is designed specifically for homeowners and contractors who need permit-ready site plans quickly and affordably. Our intuitive tools let you draw your lot, place structures, add setback lines, and export a clean, professional document that meets St. Paul DSI requirements. Whether you're planning a backyard deck in Hamline-Midway or an ADU addition in Macalester-Groveland, Site Plan Creator helps you get it right the first time and move your project forward with confidence.

Frequently Asked Questions

Do I need a permit to build a deck in St. Paul, MN?: Yes. In St. Paul, any deck that is attached to the house or raised more than 30 inches above grade requires a building permit from the Department of Safety and Inspections (DSI). You will need to submit a residential site plan showing the deck's footprint, its distance from all property lines, and its relationship to the existing structure. The site plan must be drawn to scale and include a north arrow. Permit fees are based on the estimated project valuation. Decks that are freestanding and low to the ground may still need a zoning review if they are close to a property line. Always check with DSI before starting any deck construction to avoid stop-work orders or fines.
What does St. Paul require on a residential site plan?: St. Paul's Department of Safety and Inspections requires that a residential site plan include the lot boundaries with dimensions, a north arrow, a scale indicator, the location and footprint of all existing structures on the property, the location and footprint of the proposed improvement, and setback measurements from the proposed structure to all property lines. For additions and ADUs, you will also need to include floor plans and elevation drawings. Projects near floodplains may require base flood elevation data. Properties in Heritage Preservation Districts may need additional documentation. Lot coverage calculations showing existing and proposed impervious or structural coverage should also be clearly labeled on the plan.
How long does it take to get a building permit approved in St. Paul?: Plan review timelines in St. Paul vary by project complexity. Simple residential projects such as decks, sheds, and fences are typically reviewed within 5 to 10 business days after a complete application is submitted. More complex projects, including home additions, detached garages, and accessory dwelling units (ADUs), can take 3 to 6 weeks. If your property is in a Heritage Preservation District, you must obtain Heritage Preservation Commission approval before DSI will complete its review, which can add additional weeks to the timeline. Floodplain review adds time as well. Submitting a complete, accurate application with a properly prepared site plan is the single best way to avoid delays.
How much does a building permit cost in St. Paul, MN?: Building permit fees in St. Paul are calculated based on the estimated construction valuation of your project. For smaller residential projects such as a deck or shed, permit and plan review fees typically range from a few hundred dollars. For larger projects such as a home addition or ADU, total fees can exceed one thousand dollars or more depending on the project's scope and valuation. There is a separate plan review fee that is charged in addition to the building permit fee. Fee schedules are published by the Department of Safety and Inspections and can be reviewed on the DSI website or by contacting the office directly at (651) 266-8989.
Can I draw my own site plan in St. Paul, or do I need a licensed surveyor?: For most standard residential projects in St. Paul, you are not required to hire a licensed land surveyor or architect to prepare your site plan. Homeowners and contractors can draw their own site plans as long as the document is drawn to scale, includes all required elements such as lot dimensions, structure locations, setbacks, and a north arrow, and accurately reflects the property. However, if your project involves significant structural changes, an ADU, or a property with unusual boundaries, a professional survey or architectural drawings may be required or strongly advisable. For properties in Heritage Preservation Districts or floodplain areas, additional professional documentation is often necessary. Tools like Site Plan Creator can help you produce a permit-ready site plan without professional CAD software.
What are the setback requirements for residential properties in St. Paul?: Setback requirements in St. Paul vary by zoning district. For typical single-family residential zones, front yard setbacks are generally 25 to 30 feet from the front property line, though some older neighborhoods use the average setback of adjacent homes. Side yard setbacks for principal structures are typically 5 to 10 feet, while accessory structures may be permitted as close as 3 feet to an interior side lot line. Rear yard setbacks for principal structures are usually 25 percent of the lot depth with a minimum of 25 feet; detached accessory structures often have a reduced rear setback of 3 to 5 feet. Corner lots face additional restrictions on the street-facing side. Always verify your specific district's setbacks through the St. Paul zoning resources or DSI before finalizing your plans.
Where do I submit a site plan and permit application in St. Paul?: St. Paul accepts residential building permit applications primarily through the Department of Safety and Inspections online permit portal, accessible via the city's official website at stpaul.gov. You will create an account, complete the permit application form, upload your site plan and any required supporting documents such as floor plans or elevation drawings, and pay the applicable fees electronically. In-person submissions can also be made at the DSI office located at 375 Jackson Street, Suite 220, St. Paul, MN 55101. The online portal is the fastest option for most homeowners. If you are unsure whether your project requires a permit or what documents to include, DSI staff can be reached by phone at (651) 266-8989.
What happens if I build without a permit in St. Paul?: Building without a required permit in St. Paul is a violation of the Minnesota State Building Code and local ordinances. If discovered, the city can issue a stop-work order, requiring all construction to halt immediately. You may be required to obtain an after-the-fact permit, which often involves additional fees, inspections, and in some cases, opening up finished work so inspectors can verify code compliance. Unpermitted work can also create serious problems when you sell your home, as it may be flagged during a real estate inspection or title search. In some cases, the city may require unpermitted structures to be removed entirely. It is always far less costly and disruptive to obtain the proper permit before starting any project.
What are the ADU rules in St. Paul, MN?: St. Paul has been actively expanding ADU (accessory dwelling unit) opportunities as part of its broader housing affordability strategy. Both attached ADUs and detached ADUs are permitted in most single-family and two-family residential zoning districts. A building permit is required, and a detailed site plan must be submitted showing the ADU's location, footprint, setbacks from all property lines, lot coverage, and relationship to the primary dwelling. Detached ADUs must comply with accessory structure setback requirements, which are typically 3 to 5 feet from rear and interior side lot lines depending on the zoning district. ADUs must also meet parking requirements and utility connection standards. If the property is in a Heritage Preservation District, HPC review is required before DSI will issue the permit.
Does my St. Paul property have floodplain or historic district restrictions that affect my permit?: Possibly. St. Paul has two types of overlay considerations that can significantly affect your permit process. First, portions of the city along the Mississippi River and Trout Brook are within FEMA-designated Special Flood Hazard Areas. If your property is in one of these zones, your site plan may need to include base flood elevation data and comply with the city's floodplain management ordinance. You can check your flood zone at the FEMA Flood Map Service Center. Second, St. Paul has several Heritage Preservation Districts, including parts of Summit Hill, Irvine Park, and Cathedral Hill. Exterior changes to structures in these districts require Heritage Preservation Commission approval before DSI will issue a building permit. Check both the zoning map and the heritage preservation overlay map early in your planning process.

How to Create a Site Plan in St. Paul

Confirm Your Zoning and Overlays: Before drawing anything, identify your property's zoning district using St. Paul's online zoning map available through the Planning and Economic Development department. Note whether your property falls within a Heritage Preservation District or a FEMA floodplain overlay, as these will add review steps and documentation requirements to your permit application. Contact DSI at (651) 266-8989 if you have questions about your specific property.
Prepare Your Residential Site Plan: Draw your site plan to scale, including lot boundaries with dimensions, a north arrow, the location and footprint of all existing structures, the proposed improvement's footprint, and setback measurements from the proposed structure to all property lines. Include lot coverage calculations. For additions and ADUs, attach floor plans and elevation drawings. Tools like Site Plan Creator can help you produce a clean, permit-ready document efficiently without specialized CAD software.
Obtain Any Required Pre-Approvals: If your property is in a Heritage Preservation District, submit your project to the Heritage Preservation Commission for review and approval before applying to DSI. If floodplain review is required, gather your elevation certificate and any relevant FEMA documentation. Completing these pre-approvals before submitting to DSI prevents your application from being placed on hold mid-review.
Submit Your Application to DSI: Log in to the St. Paul DSI online permit portal at stpaul.gov and complete the permit application. Upload your site plan, floor plans, elevation drawings, and any supporting documents. Pay the plan review and permit fees, which are calculated based on your project's estimated construction valuation. In-person submission is available at 375 Jackson Street, Suite 220, St. Paul, MN 55101, but the online portal is generally faster.
Respond to Plan Review Comments: After submission, DSI plan reviewers will examine your application. Simple projects are typically reviewed within 5 to 10 business days; complex projects may take 3 to 6 weeks. If reviewers identify issues such as missing setback dimensions, incomplete lot coverage data, or unclear project descriptions, you will receive a correction notice. Respond promptly with revised documents to keep your project on schedule.
Receive Permit and Schedule Inspections: Once DSI approves your application, download your permit, print it, and post it visibly at the job site as required by Minnesota law. Schedule all required inspections through the DSI portal or by phone as construction progresses. Required inspection stages vary by project type but commonly include footing, framing, and final inspections. Do not cover or enclose any work before the relevant inspection has been completed and approved.