Bolthole Index

Larimer County, Colorado

Building permits, zoning and septic rules in Fort Collins, Colorado

Fort Collins, Colorado requires building permits for most construction projects, with exemptions for some work.1 Inside city limits, Fort Collins administers zoning; individual sewage disposal work requires Larimer County health approval.23 For a home in Fort Collins, start with City Building Services and resolve the parcel’s zoning and wastewater arrangements before submitting plans.123

At a glance

Building permits
Most construction requires a city building permit; exemptions remain subject to City codes.1
Residential building code
2024 International Residential Code with Fort Collins amendments.4
Zoning
City zoning regulates land uses and building types.2
Septic approval
Larimer County health approval for individual sewage disposal work.3
Application and fees
Email application documents to Building Services; applicable initial plan-check fees are due at submittal.1
Floodplain work
A city floodplain use permit is required for work in the floodplain.5

Who to call

Building permits

Fort Collins Building Services

City building permit applications, plan review and construction questions

970-416-2740

buildingservices@fortcollins.gov

281 N. College Ave. Fort Collins, CO 80524

Planning & zoning

Fort Collins Zoning

City zoning maps, allowed uses and parcel-specific development questions

970-416-2745

zoning@fortcollins.gov

281 N. College Ave. Fort Collins, CO 80524

Septic permits

Larimer County Department of Health and Environment — OWTS

Septic system permits, soil reports and onsite wastewater review

(970)498-6775

Floodplain permits

Fort Collins Utilities — Floodplain Regulations

City floodplain requirements and floodplain use permits

970-416-2632

floodplains@fortcollins.gov

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Off-grid gear

Going off-grid in Fort Collins means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Fort Collins, CO?

Fort Collins requires a city building permit for most construction projects, while some projects are exempt.1 A Fort Collins building-permit exemption does not waive compliance with City codes, laws and ordinances.1 Fort Collins has adopted the 2024 International Residential Code, with local amendments, for residential work within its scope.4 Ask Building Services to identify the application category for your proposed home, addition or repair before preparing the submittal.1 For permitted single-family and duplex construction, a framing-and-foundation permit does not authorize framing or rough-in inspections; a full building permit is required for those and subsequent required inspections.6

Who issues building permits in Fort Collins, and how do you apply?

Use Fort Collins Building Services for city building-permit applications: the current application page directs applicants to email the required documents and applications to buildingservices@fortcollins.gov.1 Fort Collins requires applicable initial plan-check fees when you submit the application, and remaining fees when the building permit is issued.1 Fort Collins will not process or review a building permit until the applicable plan-check fee has been paid.1 If a homeowner is doing the work, the current Fort Collins application instructions call for a Homeowner Affidavit; ask Building Services which work the affidavit covers before choosing to act as your own contractor.1

Does Fort Collins have zoning, and what about RVs and tiny homes?

Fort Collins administers zoning that regulates where homes and businesses can be located, what building types can be built, and rules for fences, parking and property design.2 Start with the City zoning map and ask Fort Collins Zoning to identify the allowed residential use and development standards for the specific parcel.2 We could not confirm Fort Collins rules for living in an RV while building, district-specific tiny-home occupancy, minimum dwelling size or lot coverage; ask Fort Collins Zoning about the proposed use and Building Services about the proposed structure.21 For land outside city limits, use the Larimer County guide: the county’s zoning rules apply to unincorporated land.7

How do septic permits work inside Fort Collins?

Fort Collins requires Larimer County health approval for work involving an individual sewage disposal system.3 Larimer County requires a septic permit before building or fixing a septic system, so city building approval and county wastewater approval are separate parts of a project.83 Larimer County generally will not issue an OWTS permit when the property line is within 400 feet of a sewer line, subject to exceptions where service is infeasible or otherwise authorized.8 Ask the county OWTS program about eligibility before designing a septic-served home: a soil test is required before application, and county staff inspect the site, test pits and soil report during review.9 Composting toilets and similar alternative systems remain subject to county OWTS review.10

Building a home in Fort Collins: what are the steps?

  1. Ask Fort Collins Zoning to confirm the proposed residential use and the parcel’s development requirements.2
  2. Contact Fort Collins Utilities about floodplain requirements before construction; work in the floodplain needs a floodplain use permit.5
  3. If the project involves individual sewage disposal, obtain Larimer County health approval and resolve the septic-permit requirements with the OWTS program.38
  4. Email the required building application documents to Fort Collins Building Services and pay applicable initial plan-check fees.1
  5. Obtain the full city building permit needed for framing, rough-in and subsequent required inspections.6
  6. For a structure in a Fort Collins flood hazard area requiring a certificate of occupancy, arrange for the required certified FEMA elevation certificate to be accepted before occupancy-certificate release.11

What should you check before buying land in Fort Collins?

Ask Fort Collins Zoning about the exact proposed use, including an accessory dwelling or tiny home, rather than relying on a general residential description of the property.2 If onsite wastewater is planned, ask Larimer County OWTS whether sewer proximity prevents a septic permit and what the site evaluation must establish.89 Ask Fort Collins Utilities about floodplain requirements before committing to a building footprint or grading plan.5 We could not confirm a Fort Collins well-permit rule or a citywide utility-connection distance rule; ask Building Services which water and wastewater approvals your home application needs.1 Larimer County’s effective property tax rate is about 0.5%; that county-level figure is context rather than a parcel-specific tax estimate.12

Watch-outs

  • Fort Collins building-permit exemptions still require compliance with City codes, laws and ordinances.1
  • Fort Collins flood-hazard structures requiring a certificate of occupancy need an accepted certified FEMA elevation certificate before the certificate is released.11
  • We could not confirm permission to live in an RV during a Fort Collins home build; ask Fort Collins Zoning about occupancy before arranging temporary housing.2

Sources

  1. Fort Collins Building Services (fortcollins.gov)
  2. Fort Collins Zoning (fortcollins.gov)
  3. Building Permits - City of Fort Collins (Fort Collins), quoted and re-checked
  4. Fort Collins Municipal Code § 5-30 (Fort Collins), quoted and re-checked
  5. Fort Collins Utilities — Floodplain Regulations (fortcollins.gov)
  6. Building Permits - City of Fort Collins (Fort Collins), quoted and re-checked
  7. Zoning Districts, quoted and re-checked
  8. Septic Systems (OWTS), quoted and re-checked
  9. Larimer County Department of Health and Environment — OWTS (larimer.gov)
  10. Septic Systems (OWTS), quoted and re-checked
  11. Fort Collins Municipal Code § 10-37 (Fort Collins), quoted and re-checked
  12. Effective property tax rate: Bolthole Index county data

Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Fort Collins

Fort Collins’s own rules

  • Building permitRequired

    Residential construction requiring a full permit inside Fort Collins.

    • A framing-and-foundation permit does not allow framing or rough-in inspections; a full permit is required for those subsequent inspections.
    “A full permit must be obtained for these and subsequent required inspections.”
  • Building code adoptedAdopted (with conditions)

    One- and two-family dwellings and qualifying townhouses inside Fort Collins.

    • The Residential Code applies to construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, removal and demolition within its stated scope.
    “The 2024 International Residential Code adopted in § 5-26 (c) is amended to read as follows:”
  • InspectionsRequired

    Work proceeding beyond a residential framing-and-foundation permit inside Fort Collins.

    • Required inspections identified by the City page include framing and rough-in inspections after a full permit is obtained.
    “An F&F allows construction through the framing stage, but does not allow framing or "rough-in" inspections to be performed. A full permit must be obtained for these and subsequent required inspections.”
  • Certificate of occupancyRequired

    Structures in flood hazard areas subject to a certificate of occupancy inside Fort Collins.

    • A certified FEMA elevation certificate must be submitted to and accepted by the Utilities Executive Director before release of the certificate of occupancy.
    “A FEMA elevation certificate, signed and certified by a registered professional land surveyor, accurately documenting the as-built elevation of the improvements, must be submitted to the Utilities Executive Director and accepted before release of a certificate of occupancy for the structure.”
  • Who permits septicMixed (with conditions)

    Individual sewage disposal-system work inside Fort Collins city limits.

    • City building-permit materials require Larimer County Health Department approval for work involving individual sewage disposal systems.
    “Approval from the Larimer County Health Department is required on any work which involves food service operations, kennel and pet shops, public recreational facilities, institutions, individual sewage disposal systems and commercial demolition projects.”
  • Building in a floodplainRequired

    New construction, additions, substantial improvements, substantial-damage repairs, and redevelopment in any Fort Collins flood hazard area.

    • Elevation may be replaced only where floodproofing under § 10-38 or venting under § 10-39 is allowed.
    “In any flood hazard area, the duct work, heating, ventilation and air conditioning systems, hot water heater, electrical and the lowest floor level of any structure in the event of any new construction, addition, substantial improvement or repair of substantial damage, or redevelopment must be elevated to or above the applicable regulatory flood protection elevation, except to the extent either floodproofing is allowed in lieu of said elevation in the manner described in § 10-38 or venting is allowed in lieu of said elevation in the manner described in § 10-39.”
  • Permit feesPublished (with conditions)

    Residential framing-and-foundation permits and plan review inside Fort Collins.

    • The $150 F&F permit applies to single-family and duplex-only work after reviews are completed; plan-check fees are valuation-based.

    residential framing and foundation permit: 150 USD (Single-family and duplex only.) · plan-check fee: per 1 USD per $1,000 valuation

    “A residential "framing and foundation" (F&F) permit can be issued for $150 (single-family and duplex only) as soon as all reviews are completed. [...] Plan check fees are based on $1 per $1,000 of valuation and are typically ready in about one week.”
  • Permit processPublished (with conditions)

    Building-permit applications inside Fort Collins.

    • Plans are checked for zoning, building-code, and applicable other-department requirements; permit issuance follows completed reviews and approval.
    “The plans are then "logged in" and checked, in order of their submission, for zoning and building code compliance in addition to any applicable requirements by other departments. When reviews are completed and plans are approved, the permit can be issued.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Fort Collins or Larimer County directly.

  • Owner-builder exemption — Owner-built residential work inside Fort Collins city limits.
  • Minimum dwelling size — Dwellings inside Fort Collins city limits.
  • Lot coverage — Residential land inside Fort Collins city limits.
  • Tiny homes — Tiny homes inside Fort Collins city limits.
  • Accessory dwellings — Accessory dwelling units inside Fort Collins city limits.
7 more unanswered
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Fort Collins publishes no rule on the point, not that none exists. Larimer County’s page lists the county offices to call.

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