Do I need a permit to build a deck in Fort Collins, CO?

Yes. In Fort Collins, any deck that is more than 30 inches above grade requires a building permit. Even decks below that height may need a zoning review if they are attached to the home or located close to a property line. Your permit application must include a site plan showing the deck's dimensions, its distance from all property lines, and its relationship to the existing house footprint. The City of Fort Collins enforces the 2021 International Residential Code for deck construction, so your plan must also address structural elements like footing size and ledger attachment. Submitting a complete, to-scale site plan with your application is the fastest way to avoid correction requests and delays.

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

For routine residential projects such as decks, sheds, or small additions, Fort Collins plan reviewers typically complete a first review in 10 to 15 business days after a complete application is submitted. If corrections are required, you will need to revise and resubmit, which adds additional review cycles. More complex projects, properties in the Old Town Historic District, or parcels in a FEMA floodplain can take four to eight weeks or longer from initial submission to permit issuance. The single best way to shorten your timeline is to submit a complete, accurate application the first time, with a properly scaled site plan that addresses all setbacks, easements, and coverage calculations.

What does Fort Collins require on a residential site plan?

A residential site plan submitted to the City of Fort Collins must typically include: the lot boundaries with dimensions, a north arrow, the property address, all existing structures on the lot with their footprints, the proposed new structure or improvement with its footprint and dimensions, setback distances from the proposed work to all property lines, any utility or drainage easements shown on the plat, and a scale bar or stated drawing scale. For projects near drainageways or in flood zones, finished floor elevations and floodplain boundaries may also be required. Impervious surface calculations are expected for additions and new accessory structures in most residential zones. The plan does not need to be prepared by a licensed engineer or surveyor for most simple residential projects.

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

For most standard residential permit applications in Fort Collins, such as a deck, shed, fence, or small addition, you are not required to hire a licensed surveyor or engineer to prepare your site plan. The city requires that the plan be accurate and drawn to scale, but it can be prepared by the homeowner or contractor. However, if your project involves a new ADU, a significant structural addition, work in a floodplain, or a project within a historic district, additional stamped engineering or architectural drawings may be required. Using an online tool like Site Plan Creator can help you produce a clean, to-scale site plan that meets Fort Collins formatting expectations without professional fees.

What are the setback requirements for residential properties in Fort Collins?

Setback requirements in Fort Collins vary by zoning district, but typical residential zones such as RL (Low Density Residential) and LMN (Low Density Mixed-Use Neighborhood) generally require a front yard setback of 15 to 20 feet, a minimum side yard setback of 5 feet, and a rear yard setback of 15 feet for principal structures. Accessory structures like sheds and detached garages may be allowed as close as 5 feet to the rear property line, and garages accessed from an alley may be placed even closer. Corner lots have additional street-side setback requirements. Always verify your specific setbacks using the Fort Collins Zoning Map or by contacting the Development Review Center, since planned unit developments and overlay districts can modify standard requirements.

Where do I submit a site plan or permit application in Fort Collins?

Fort Collins processes most residential permit applications through its online Development Review portal at fcgov.com/developmentreview. You can upload your site plan, completed application form, and supporting documents directly through the portal without visiting City Hall. For projects that qualify as over-the-counter permits, same-day or next-day approvals are sometimes possible. In-person submissions and pre-application meetings are available at the Development Review Center located at 281 N College Ave in Fort Collins. Staff at the center can answer questions about what your specific project requires before you invest time in preparing your application. Calling ahead at (970) 221-6760 is recommended for complex projects.

What happens if I build without a permit in Fort Collins?

Building without a required permit in Fort Collins is a violation of the city's municipal code and can result in a stop-work order, fines, and a requirement to remove or demolish unpermitted work. If the work is discovered during a future sale or refinance inspection, you may be required to obtain a retroactive permit, which often involves opening walls or exposing structural elements for inspection. Retroactive permits can cost significantly more than a standard permit and may require you to bring the work up to current code standards even if it was built years ago. Fort Collins code enforcement officers respond to complaints from neighbors and conduct site inspections, so unpermitted work is frequently discovered.

How much does a building permit cost in Fort Collins, CO?

Permit fees in Fort Collins are calculated based on the valuation of the proposed work, the type of project, and any required plan review fees. For a typical residential deck, fees might range from $150 to $400. A room addition or detached garage could generate fees of $500 to $1,500 or more depending on the project value. ADU permits involve development review fees in addition to building permit fees, which can push total costs to several thousand dollars. Fort Collins publishes its current fee schedule on the city website, and the Development Review Center can provide a fee estimate before you submit. Plan review fees are typically non-refundable even if a permit is ultimately denied or withdrawn.

Do I need a permit to build an ADU in Fort Collins?

Yes. Accessory Dwelling Units in Fort Collins require both a development review and a building permit. Fort Collins has made ADU construction a priority as part of its housing affordability strategy, and the city has streamlined some ADU approvals in recent years. However, you will still need a site plan showing the ADU's location, setbacks, parking, and relationship to the primary dwelling. ADUs must comply with the Fort Collins Land Use Code requirements for the specific zoning district, including maximum size limits and design standards. Detached ADUs, attached ADUs, and garage conversions each have slightly different requirements. Contacting the Development Review Center early in your planning process is strongly recommended for ADU projects.

Does Fort Collins have any floodplain rules that affect residential permits?

Yes. Parts of Fort Collins lie within FEMA-designated Special Flood Hazard Areas, particularly near the Cache la Poudre River, Spring Creek, and other drainageways. If your property is in or adjacent to a floodplain, you may need a Floodplain Use Permit in addition to a standard building permit. Your site plan must show the floodplain boundary and any proposed finished floor elevations relative to the Base Flood Elevation. Fort Collins has adopted local floodplain regulations that in some cases are stricter than the minimum FEMA standards. You can check your flood zone status using the FEMA Flood Map Service Center online. Floodplain permits are reviewed by the city's Utilities department and can add several weeks to your overall timeline.

Site Plan Requirements in Fort Collins, CO (Permit Guide)

By Site Plan Creator Team • June 26, 2026

Fort Collins, Colorado has detailed residential permit and site plan requirements for projects ranging from backyard decks to accessory dwelling units. Understanding what the city requires before you break ground can save you time, money, and costly rework. This guide covers everything Fort Collins homeowners need to know about site plans and building permits.

Site plan requirements for residential properties in Fort Collins, Colorado

Residential Site Plans and Building Permits in Fort Collins, CO

Fort Collins is one of Colorado's fastest-growing cities, and with that growth comes an active building department that takes residential permitting seriously. Whether you are adding a deck to your Midtown bungalow, converting a garage near Old Town, or building an accessory dwelling unit in a newer southeast neighborhood, the City of Fort Collins requires a site plan as part of nearly every residential building permit application. Getting that plan right the first time is the single most effective way to keep your project on schedule.

What Is a Residential Site Plan and Why Does Fort Collins 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 any other features relevant to your project. Fort Collins uses site plans to verify that proposed improvements comply with the Fort Collins Land Use Code, zoning district standards, and adopted building codes before a permit is issued. The city adopted the 2021 International Building Code (IBC) and 2021 International Residential Code (IRC) as its base construction standards, so your plans must reflect those requirements as well.

Site plans protect both the city and the homeowner. They confirm that a new shed will not encroach on a utility easement, that an addition will not push impervious surface coverage beyond allowed limits, and that a new driveway will not create a drainage problem for neighboring properties.

Common Residential Permit Triggers in Fort Collins

Not every home improvement project requires a permit, but most structural or significant work does. The following projects almost always require both a building permit and a site plan in Fort Collins:

Decks and patios: Any deck more than 30 inches above grade requires a permit. Attached decks require a site plan showing setbacks from property lines.
Sheds and accessory structures: Detached structures larger than 120 square feet require a permit. Even smaller sheds may need a zoning review if they are in a front yard or close to a property line.
Swimming pools and hot tubs: In-ground pools always require a permit. Above-ground pools over 24 inches deep also trigger permit requirements, along with fencing and barrier rules.
Fences: Fences over six feet in height require a permit. Fences in front yards are limited to four feet in most residential zones.
Room additions and home expansions: Any addition to the footprint of a home requires a full building permit and a detailed site plan.
Accessory Dwelling Units (ADUs): Fort Collins actively encourages ADU construction as part of its housing strategy, but ADUs require a development review, a site plan, and a building permit.
Driveways and curb cuts: New driveways or modifications to existing curb cuts require a right-of-way permit and often a site plan showing grades and drainage.
Detached garages: New detached garages require a permit and a site plan regardless of size.

Local Zoning Considerations Unique to Fort Collins

Fort Collins has several zoning and land-use considerations that can affect your project in ways you might not expect:

Old Town Historic Districts: Properties within the Old Town Historic District or other locally designated historic areas may require a Certificate of Appropriateness from the Landmark Preservation Commission before a building permit can be issued. This adds a review layer that can extend timelines by several weeks.

Floodplain Regulations: Portions of Fort Collins lie within FEMA-designated Special Flood Hazard Areas, particularly near the Cache la Poudre River and other drainageways. If your property is in or near a floodplain, your site plan must address finished floor elevations and may require a floodplain use permit in addition to a standard building permit. You can check your property's flood zone status at the FEMA Flood Map Service Center.

Impervious Surface Limits: Many Fort Collins residential zones cap the total amount of hard surface (roofs, driveways, patios, concrete) on a lot. Adding a large patio or driveway extension could push you over the limit, so your site plan must calculate existing and proposed impervious coverage.

Tree Preservation: Fort Collins has a robust urban forestry program. If your project involves removing or impacting a significant tree, you may need a separate review by the city's urban forestry staff before a permit is approved.

HOA Overlays: Many Fort Collins neighborhoods have active homeowners associations with their own design standards. HOA approval does not replace city permits, and city permits do not replace HOA approval. You need both.

Typical Setback Requirements in Fort Collins

Setbacks vary by zoning district, but the following ranges are representative of common residential zones (RL, LMN, MMN) in Fort Collins:

Front yard setback: 15 to 20 feet from the front property line (or from the back of the sidewalk in some zones)
Side yard setback: 5 feet minimum for most residential zones; corner lots may have a 15-foot setback on the street side
Rear yard setback: 15 feet for principal structures; accessory structures may be allowed as close as 5 feet to the rear property line
Garage setbacks: Detached garages accessed from an alley may be placed closer to the rear property line, sometimes as little as 3 to 5 feet

Always verify setbacks for your specific parcel using the Fort Collins Zoning Map or by contacting Development Review staff directly, as overlay districts and planned unit developments can alter standard setbacks significantly.

How to Submit a Permit Application in Fort Collins

Fort Collins has moved the majority of its residential permit submissions to its online portal, making it easier to apply without visiting City Hall in person. Here is a general overview of the process:

Determine your permit type. Use the city's development review resources to identify whether your project is a simple over-the-counter permit, a minor amendment, or a full development review.
Prepare your site plan. Draw your site plan to scale, showing lot dimensions, all existing structures, the proposed improvement, setbacks, easements, and north arrow. Site Plan Creator can help you generate a clean, to-scale plan that meets city formatting expectations.
Submit through the online portal. Fort Collins uses its Development Review Online system for most applications. Upload your site plan, completed application form, and any supporting documents.
Pay the plan review fee. Fees are calculated based on project valuation and type. Residential projects typically range from a few hundred to several thousand dollars depending on scope.
Respond to comments. Plan reviewers will issue comments if corrections are needed. Respond promptly and resubmit corrected documents through the same portal.
Receive your permit and schedule inspections. Once approved, download your permit, post it on site, and schedule required inspections through the city's inspection request system.

Plan review timelines for routine residential projects in Fort Collins typically run 10 to 15 business days for a first review. Complex projects, historic district reviews, or floodplain permits can take four to eight weeks or longer. Submitting a complete, accurate application the first time is the best way to avoid adding weeks to your timeline.

Common Reasons Fort Collins Permit Applications Are Rejected

Plan reviewers in Fort Collins see the same mistakes repeatedly. Avoid these common errors:

Site plan is not drawn to scale or lacks a scale bar
Missing or incorrect setback dimensions from proposed structure to property lines
Easements not shown (utility, drainage, or access easements appear on your deed and plat)
Impervious surface calculations missing or incorrect
Project description on the application does not match what is shown on the site plan
No north arrow or property address on the plan
Floodplain overlay not addressed when the property is in or near a flood zone
Historic district review not initiated prior to building permit application

Start Your Fort Collins Site Plan with Site Plan Creator

Creating an accurate, professional-looking site plan does not require a surveyor or an architect for most residential projects in Fort Collins. Site Plan Creator gives homeowners and contractors an intuitive online tool to produce scaled site plans that include all the elements Fort Collins reviewers expect: lot lines, setbacks, structure footprints, easements, north arrows, and more. Start your plan today and move your Fort Collins permit application forward with confidence.

Frequently Asked Questions

Do I need a permit to build a deck in Fort Collins, CO?: Yes. In Fort Collins, any deck that is more than 30 inches above grade requires a building permit. Even decks below that height may need a zoning review if they are attached to the home or located close to a property line. Your permit application must include a site plan showing the deck's dimensions, its distance from all property lines, and its relationship to the existing house footprint. The City of Fort Collins enforces the 2021 International Residential Code for deck construction, so your plan must also address structural elements like footing size and ledger attachment. Submitting a complete, to-scale site plan with your application is the fastest way to avoid correction requests and delays.
How long does it take to get a building permit approved in Fort Collins?: For routine residential projects such as decks, sheds, or small additions, Fort Collins plan reviewers typically complete a first review in 10 to 15 business days after a complete application is submitted. If corrections are required, you will need to revise and resubmit, which adds additional review cycles. More complex projects, properties in the Old Town Historic District, or parcels in a FEMA floodplain can take four to eight weeks or longer from initial submission to permit issuance. The single best way to shorten your timeline is to submit a complete, accurate application the first time, with a properly scaled site plan that addresses all setbacks, easements, and coverage calculations.
What does Fort Collins require on a residential site plan?: A residential site plan submitted to the City of Fort Collins must typically include: the lot boundaries with dimensions, a north arrow, the property address, all existing structures on the lot with their footprints, the proposed new structure or improvement with its footprint and dimensions, setback distances from the proposed work to all property lines, any utility or drainage easements shown on the plat, and a scale bar or stated drawing scale. For projects near drainageways or in flood zones, finished floor elevations and floodplain boundaries may also be required. Impervious surface calculations are expected for additions and new accessory structures in most residential zones. The plan does not need to be prepared by a licensed engineer or surveyor for most simple residential projects.
Can I draw my own site plan in Fort Collins, or do I need a licensed surveyor?: For most standard residential permit applications in Fort Collins, such as a deck, shed, fence, or small addition, you are not required to hire a licensed surveyor or engineer to prepare your site plan. The city requires that the plan be accurate and drawn to scale, but it can be prepared by the homeowner or contractor. However, if your project involves a new ADU, a significant structural addition, work in a floodplain, or a project within a historic district, additional stamped engineering or architectural drawings may be required. Using an online tool like Site Plan Creator can help you produce a clean, to-scale site plan that meets Fort Collins formatting expectations without professional fees.
What are the setback requirements for residential properties in Fort Collins?: Setback requirements in Fort Collins vary by zoning district, but typical residential zones such as RL (Low Density Residential) and LMN (Low Density Mixed-Use Neighborhood) generally require a front yard setback of 15 to 20 feet, a minimum side yard setback of 5 feet, and a rear yard setback of 15 feet for principal structures. Accessory structures like sheds and detached garages may be allowed as close as 5 feet to the rear property line, and garages accessed from an alley may be placed even closer. Corner lots have additional street-side setback requirements. Always verify your specific setbacks using the Fort Collins Zoning Map or by contacting the Development Review Center, since planned unit developments and overlay districts can modify standard requirements.
Where do I submit a site plan or permit application in Fort Collins?: Fort Collins processes most residential permit applications through its online Development Review portal at fcgov.com/developmentreview. You can upload your site plan, completed application form, and supporting documents directly through the portal without visiting City Hall. For projects that qualify as over-the-counter permits, same-day or next-day approvals are sometimes possible. In-person submissions and pre-application meetings are available at the Development Review Center located at 281 N College Ave in Fort Collins. Staff at the center can answer questions about what your specific project requires before you invest time in preparing your application. Calling ahead at (970) 221-6760 is recommended for complex projects.
What happens if I build without a permit in Fort Collins?: Building without a required permit in Fort Collins is a violation of the city's municipal code and can result in a stop-work order, fines, and a requirement to remove or demolish unpermitted work. If the work is discovered during a future sale or refinance inspection, you may be required to obtain a retroactive permit, which often involves opening walls or exposing structural elements for inspection. Retroactive permits can cost significantly more than a standard permit and may require you to bring the work up to current code standards even if it was built years ago. Fort Collins code enforcement officers respond to complaints from neighbors and conduct site inspections, so unpermitted work is frequently discovered.
How much does a building permit cost in Fort Collins, CO?: Permit fees in Fort Collins are calculated based on the valuation of the proposed work, the type of project, and any required plan review fees. For a typical residential deck, fees might range from $150 to $400. A room addition or detached garage could generate fees of $500 to $1,500 or more depending on the project value. ADU permits involve development review fees in addition to building permit fees, which can push total costs to several thousand dollars. Fort Collins publishes its current fee schedule on the city website, and the Development Review Center can provide a fee estimate before you submit. Plan review fees are typically non-refundable even if a permit is ultimately denied or withdrawn.
Do I need a permit to build an ADU in Fort Collins?: Yes. Accessory Dwelling Units in Fort Collins require both a development review and a building permit. Fort Collins has made ADU construction a priority as part of its housing affordability strategy, and the city has streamlined some ADU approvals in recent years. However, you will still need a site plan showing the ADU's location, setbacks, parking, and relationship to the primary dwelling. ADUs must comply with the Fort Collins Land Use Code requirements for the specific zoning district, including maximum size limits and design standards. Detached ADUs, attached ADUs, and garage conversions each have slightly different requirements. Contacting the Development Review Center early in your planning process is strongly recommended for ADU projects.
Does Fort Collins have any floodplain rules that affect residential permits?: Yes. Parts of Fort Collins lie within FEMA-designated Special Flood Hazard Areas, particularly near the Cache la Poudre River, Spring Creek, and other drainageways. If your property is in or adjacent to a floodplain, you may need a Floodplain Use Permit in addition to a standard building permit. Your site plan must show the floodplain boundary and any proposed finished floor elevations relative to the Base Flood Elevation. Fort Collins has adopted local floodplain regulations that in some cases are stricter than the minimum FEMA standards. You can check your flood zone status using the FEMA Flood Map Service Center online. Floodplain permits are reviewed by the city's Utilities department and can add several weeks to your overall timeline.

How to Create a Site Plan in Fort Collins

Confirm Your Permit Requirements: Start by determining whether your specific project requires a building permit and site plan in Fort Collins. Check the city's Development Review resources at fcgov.com/developmentreview or call the Development Review Center at (970) 221-6760. Identify your zoning district using the Fort Collins Zoning Map, and note any overlay districts such as historic, floodplain, or planned unit development zones that may apply to your parcel, since these can significantly affect what is required.
Gather Your Property Documents: Collect your property's legal description, recorded plat, and deed to identify lot dimensions, easements, and any restrictions. Your plat will show utility easements, drainage easements, and building envelopes that must be reflected on your site plan. You can obtain a copy of your plat from the Larimer County Clerk and Recorder's office or through the county's online records portal. Having accurate lot dimensions before you start drawing your site plan prevents costly errors during plan review.
Draw Your Site Plan to Scale: Create a scaled site plan that shows your lot boundaries with dimensions, all existing structures, the proposed improvement, setback distances from all property lines, easements, a north arrow, a scale bar, and your property address. Site Plan Creator's online tool makes it straightforward to produce a clean, professional-looking plan that includes all the elements Fort Collins reviewers expect. Ensure your plan accurately reflects impervious surface areas if you are adding hard surfaces like patios or driveways.
Submit Your Application Online: Upload your completed permit application, site plan, and any required supporting documents through the Fort Collins Development Review online portal. Double-check that your application description matches what is shown on the site plan, and that all required fields are complete. Pay the applicable plan review and permit fees at the time of submission. Incomplete applications are a leading cause of delays, so review the city's submittal checklist for your project type before uploading.
Respond to Plan Review Comments: After your application is reviewed, Fort Collins plan reviewers will issue either an approval or a correction letter through the online portal. If corrections are needed, address each comment carefully and resubmit revised documents promptly. Common corrections involve missing setback dimensions, easement omissions, or impervious surface calculation errors. Responding quickly and thoroughly to each comment minimizes the number of review cycles and keeps your project moving toward permit issuance.
Schedule Inspections and Close Your Permit: Once your permit is issued, download it, post it visibly on the job site, and begin construction. Schedule required inspections through the Fort Collins inspection request system at the appropriate stages of your project, such as footing, framing, and final inspections. Do not cover work before it has been inspected. After all inspections pass, the city will issue a final approval and close your permit, which is important documentation for future property sales or refinancing.