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

[email protected]

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

[email protected]

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

[email protected]

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 [email protected].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 code adoptedAdopted (with conditions)

    One- and two-family dwellings and townhouses inside Fort Collins city limits.

    • The adopted IRC is amended by Municipal Code § 5-30.

    code edition: 2024 International Residential Code (As amended by § 5-30)

    “The 2024 International Residential Code adopted in § 5-26 (c) is amended to read as follows:”
  • InspectionsRequired

    Permitted single-family and duplex construction inside Fort Collins city limits.

    • A framing-and-foundation permit does not authorize framing or rough-in inspections; a full permit is required for those and subsequent required inspections.
    “A full permit must be pulled for these and subsequent required inspections.”
  • Certificate of occupancyLimited

    Structures in a Fort Collins flood hazard area requiring a certificate of occupancy.

    • A FEMA elevation certificate must be submitted to and accepted by the Utilities Executive Director before certificate-of-occupancy release.
    “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.”
  • Permit feesPublished (with conditions)

    Building permits inside Fort Collins city limits.

    • Plan-review fee is collected at plan submittal for work valued over $3,000; building-permit and applicable fees are paid at issuance.

    plan review fee trigger: > 3000 USD valuation (Plan-review fee collected at submittal)

    “A plan review fee will be collected at the time of plans submittal on all work valued over $3,000. The building permit and any other applicable fees will be paid at the time the permit is issued. See Building Permit Fee Schedule.”
  • Permit processPublished (with conditions)

    Building permits inside Fort Collins city limits.

    • At least two complete plan sets are submitted; plans are reviewed and approved before permit issuance.

    complete plan sets: >= 2 sets

    “Submit at least two (2) complete sets of construction plans. See Residential Permits or Commercial Permits. Your plans are reviewed for code compliance.”

Rules another office applies inside Fort Collins

Fort Collins does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Who permits septicCounty (with conditions)

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

    • The City states that Larimer County Health Department approval is required 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.”

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 lots 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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