Bolthole Index

Costilla County, Colorado

Building permits, zoning and land rules in Costilla County, Colorado

69Index Score / 100
#2 of 64 in Colorado

Unincorporated Costilla County, Colorado requires a building permit for all new structures in any zone district, and the county requires an OWTS permit and a confirmed water source before it will issue a certificate of occupancy1. The county's Land Use Code establishes zoning with districts including Agricultural (A) and Estate Residential (ER), each carrying its own minimum lot size2. Septic systems 2,000 gallons per day or less are permitted directly by the county under state OWTS rules, through the same Planning and Zoning Department that issues building and zoning permits3.

At a glance

Building permit
Required for all new structures; the county has adopted the 2018 IRC and permits must be renewed annually14
Zoning
Yes, countywide, with Agricultural (A) and Estate Residential (ER) districts, each with its own minimum lot size2
Septic (OWTS) permits
County-issued for systems 2,000 gpd or less, through Planning and Zoning34
Owner-builder exemption
Unconfirmed; no explicit owner-builder exemption was found on the county's official sources5
Manufactured homes
Must be 1976 or newer to be allowed in Costilla County4
Design criteria
Countywide snow load 30 lbs/sq ft, wind load 115 mph4
35-acre subdivision exemption
Parcels of at least 35 acres each, not intended for multiple owners, are exempt from Colorado's subdivision review6
Septic soil difficulty
About 34.6% of county soils are free of severe limits for a conventional drain field7

Who to call

Planning & zoning

Costilla County Planning and Zoning Department

Building permits, zoning permits, physical addressing, and OWTS (septic) soil evaluations and permits for unincorporated Costilla County

(719) 937-7668

400 Gaspar Street, PO Box 130, San Luis, CO 81152

Contact details are copied from each office’s official page and were checked against it on September 28, 2026.

Do you need a building permit in Costilla County, Colorado?

Yes. All new structures in any zone district require a Costilla County building permit, and the county requires an OWTS permit and a confirmed water source in place before it will issue a certificate of occupancy1. Costilla County has adopted the 2018 International Residential Code as its building code, along with its own design criteria: a countywide snow load of 30 pounds per square foot and a wind load of 115 miles per hour4. Permits here don't last forever: construction permits must be renewed annually, and the Land Use Administrator has discretion to issue up to 3 annual renewals for a property, with a 4th permit requiring a variance request to the Board of County Commissioners4. Manufactured homes face their own age rule, stated plainly on the county's page: manufactured homes must be 1976 or newer to be allowed in Costilla County4. Colorado's own framework explains why the county sets these rules itself: the state is a "local control" state, so decisions like building-code adoption are made by the county rather than through a uniform statewide code8.

Who is the Costilla County building department, and how do you reach them?

The Costilla County Planning and Zoning Department is the office for building permits, zoning permits, physical addressing, and OWTS soil evaluations, located at 400 Gaspar Street, San Luis, Colorado 811524. Reach the office at (719) 937-7668; it is open 7:00 a.m. to 5:30 p.m., Monday through Thursday, with no closure for lunch4. Building inspections are scheduled by calling the Planning and Zoning Office at that same number4. The department asks buyers to contact it before purchasing land or starting a land-use activity in Costilla County4. For a physical address, bring the parcel's legal description and the owner's name as registered with the Costilla County Assessor; the fee is $20, and the county does not issue a physical address to vacant land4.

Does Costilla County have zoning?

Yes. The county's Land Use Code establishes zoning districts across unincorporated Costilla County, including Agricultural (A) and Estate Residential (ER), each with its own minimum lot size2. Colorado law gives the county broad authority to zone unincorporated territory, regulating building location, height, bulk, lot size, lot coverage, open space, population density, and land use by district9. Building height and story limits in Colorado are set at the local level rather than by a statewide number, so Costilla County's own zoning ordinance controls what you can build on a given lot10. One state rule matters if you're buying a larger tract with an eye toward splitting it later: a division of land into parcels of at least 35 acres each, none intended for use by multiple owners, is excluded from Colorado's subdivision definition entirely, which is a major reason large acreage in rural counties like Costilla trades without going through subdivision review6. Confirm which zoning district your specific parcel sits in, and its minimum lot size, with the Planning and Zoning Department before you buy4.

How do OWTS (septic) permits work in Costilla County?

Costilla County issues its own on-site wastewater treatment system (OWTS) permits for systems of 2,000 gallons per day or less, under Colorado Department of Public Health and Environment Regulation 43, using the county's own application3. The same Planning and Zoning Department that handles building and zoning permits also handles soil evaluations for septic systems, with staff assigned specifically to that task4. Statewide, Colorado law backs the county's authority and adds hard rules of its own: a person may not construct, alter, install, or use an OWTS without first applying for and receiving a permit, and every system needs a final inspection before it goes into use1112. Certain shortcuts are banned outright: Colorado prohibits construction of new cesspools statewide, and any building not served by a sewage treatment works must have adequate sanitary sewage disposal before it can be occupied13. Soils here are more favorable than in many rural counties: about 34.6% of Costilla County's soils are free of severe limitations for a conventional drain field, though a site evaluation from the county is still the way to confirm your specific parcel7.

Can you live in an RV or tiny home on your land in Costilla County?

We could not confirm a Costilla County rule for living in an RV on a residential parcel; ask the Planning and Zoning Department before buying land for that purpose4. Colorado-regulated tiny homes can be approved for long-term living, but plans must go to the Colorado Division of Housing before construction, the home must meet applicable codes and local zoning, and certification applies to the installation site14. Costilla County separately says temporary cargo and shipping containers are allowed only during construction4. Manufactured homes have a clearer local rule: Costilla County requires them to be 1976 or newer, while Colorado allows a HUD-code home to be installed where local zoning permits it415. Confirm the parcel's zoning and the proposed dwelling type with Planning and Zoning before committing to the purchase4.

Building a home in Costilla County: the steps, in order

First, contact the Costilla County Planning and Zoning Department at (719) 937-7668 before you close on land, since the department asks buyers to check in "prior to purchasing land or commencing any land use activity in Costilla County"4. Second, confirm your parcel's zoning district, whether it's Agricultural or Estate Residential or another district, and its minimum lot size2. Third, apply for your OWTS (septic) permit and schedule a soil evaluation with the Planning and Zoning Department before you finalize your house design, since the county requires the OWTS permit and a confirmed water source before it will issue an occupancy permit14. Fourth, if you'll need a well, apply through Colorado's Division of Water Resources, and budget for the fact that a complete new or replacement application can take up to 49 days to review, longer if an augmentation plan is required16. Fifth, submit your building permit application built to the 2018 IRC and the county's design criteria (30 lbs/sq ft snow load, 115 mph wind load), and know it must be renewed annually if construction runs long4. Sixth, if your driveway will connect to a state highway, apply for a CDOT access permit; a single-family residential or agricultural driveway falls into the Level 1 category with a $50 fee17. Finally, if you need a temporary storage container on site, remember Costilla County allows cargo and shipping containers only during construction, not as permanent structures4.

What to check before you buy land in Costilla County

Water is the single most important thing to verify in the San Luis Valley: every new well that diverts groundwater needs a permit from Colorado's Division of Water Resources, and basin-specific rules or an augmentation plan may apply if the well's priority isn't sufficient to divert in priority, so confirm water availability before you rely on a parcel having a viable well16. Many small rural parcels in this region were created before current subdivision rules, or under the state's 35-acre exemption from subdivision review, so ask Planning and Zoning to confirm your specific parcel's legal status and access before you buy64. Septic soils are relatively favorable here: about 34.6% of Costilla County's soils are free of severe limitations for a conventional drain field, better than many rural counties, though a county soil evaluation is still required7. Terrain is moderate: 58.6% of the county sits at 15% slope or less, and 36.2% is wooded, while 23.9% of the county is federal land181920. Water is limited overall: the county averages about 17.5 inches of rain a year, with severe drought hitting roughly 34.2% of years2122. Carrying costs run low: the effective property tax rate is about 0.3%, with a median bill near $531 a year against a typical home value around $184,317232425.

Watch-outs

  • Water rights are the central risk in Costilla County and the wider San Luis Valley: a well permit from the Division of Water Resources is required for every new well, and basin-specific rules can limit or condition that permit, so confirm water availability directly with the state and county before you buy rather than assuming a parcel can support a well16.
  • We could not confirm Costilla County's rule for living in an RV on a residential parcel, so ask Planning and Zoning before buying land for that purpose4.
  • We could not confirm an owner-builder exemption in Costilla County, so ask the Planning and Zoning Department whether acting as your own contractor changes the permit process5.

Sources

  1. Costilla County Planning and Zoning Department (2026 county census)
  2. Costilla County Land Use Code (Division 1 Zoning) (2026 county census)
  3. Costilla County OWTS Application (2026 county census)
  4. Costilla County Planning and Zoning Department (costillacounty.gov)
  5. (2026 county census)
  6. Colorado Revised Statutes 2024, Title 30—Government—County (Colorado statewide rule), quoted and re-checked
  7. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  8. Land Use Planning and Regulation in Colorado (Colorado statewide rule), quoted and re-checked
  9. Colorado Revised Statutes 2025 Title 30 Government - County (Colorado statewide rule), quoted and re-checked
  10. Colorado Revised Statutes 2024, Title 31 — Government - Municipal (Colorado statewide rule), quoted and re-checked
  11. Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
  12. Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
  13. Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
  14. Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
  15. Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
  16. Water Administration (Colorado statewide rule), quoted and re-checked
  17. Access Permits | Frequently Asked Questions (Colorado statewide rule), quoted and re-checked
  18. Share of land at 15% slope or less: Bolthole Index county data
  19. Wooded share of land: Bolthole Index county data
  20. Federal land share: Bolthole Index county data
  21. Annual precipitation: Bolthole Index county data
  22. Share of years in severe drought: Bolthole Index county data
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data
  25. Typical home value (Zillow): Bolthole Index county data

Written September 28, 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.

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County locator

Costilla County in Colorado

69
County map
Costilla County highlighted among the Colorado counties · colored by Index score

How Costilla County scores

Seclusion88100% ev.
Self-Sufficiency46100% ev.
Admin Boringness4190% ev.
Durability51100% ev.
Property Autonomy75100% ev.
Carry Cost90100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$184kTypical home
0.3%Property tax
$996Land / acre
17.5"Annual rain
34.2% of yrsSevere drought
0 / yr (+0)Mid-century 100°F days
24.1 daysMid-century dry spell
0.98" (+2%)Mid-century 1-day rain
1.34×Wildfire change factor
100%Forward climate coverage
$1,614Home insurance / yr
3.2% / yrInsurance growth
1.15%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
71,853People within 2 hr
2,190Radius comparison (15 mi)
3People / sq mi
23.9%Federal land
58.6%Land at 15% slope or less
34.6%Septic soil without severe limits
270,471 acWorkable land screen
36.2%Wooded land
29.1 tonsBiomass / forest ac
42.5°FAvg temp

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Answers from the rulebook for Costilla County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Costilla County rules

  • County-wide zoningPresent

    The county Land Use Code establishes zoning with districts including Agricultural (A) and Estate Residential (ER), each with minimum lot sizes.

    Costilla County Land Use Code (Division 1 Zoning) ↗Scouted from the county site, not yet independently re-checked

Colorado rules that apply here

  • Building permitRequired

    Construction, including adding previously unlicensed space to a Health Facility license, or operational permits for a Colorado-licensed Health Facility located in a jurisdiction with no local Building Department.

    • The Division is responsible for issuing the building permit when no local Building Department exists.
    • Limited Scope Project permits may be used instead of an individual Building, Fire, or Life Safety Code permit for projects identified by the Division.
    • Permit issuance is contingent upon review and approval by the Fire Code Official.
    • The determination of when a building permit is required is based on International Building Code Section 105 requirements, except Sections 105.1.1 and 105.1.2.
    • Substantial changes to the project scope, including adding square footage, require a new permit application.
    • Once all corrections identified through code review are satisfactorily addressed, the Division will issue the permit.

    building permit determination: International Building Code Section 105, except Sections 105.1.1 and 105.1.2 (Substantial changes to project scope require a new permit application.)

    “Under these circumstances, the Division will issue the applicable Building Permits and associated Certificates of Occupancy”
    One more reviewed finding on this topic
    • Limited — Construction, renovation, emergency, cash-funded, or in-house-funded projects involving Colorado state buildings and administered through the Department of Personnel and Administration/Office of the State Architect.
      “State Buildings Program (SBP) is responsible for establishing minimum building codes for all construction by state agencies [...] Colorado has no statewide building code”
  • Building code adoptedPartial

    Construction at Colorado state agencies and institutions of higher education owned facilities.

    • The approved state building codes are minimum requirements for the specified state-owned facilities.
    • The source states that additional codes, standards, and appendices may be adopted by state agencies and institutions in addition to the listed minimum codes and standards.
    • The statewide source describes Colorado as a local-control state in which most building-code adoption decisions are driven by local governments, not the state.
    • The listed code editions and effective dates are those stated in the retrieved Approved State Building Codes document, which is marked Rev. 9/2023.

    International Building Code edition: 2021 edition (Chapter 1 as amended; Chapters 2-35 and Appendices C and I) · International Residential Code edition: 2021 edition (As applicable) · International Energy Conservation Code edition: 2021 edition (As adopted by the Colorado State Buildings Program and Colorado Energy Office) · National Electrical Code edition: 2023 edition (Effective July 30, 2023) · Colorado Model Electric Ready and Solar Ready Code effective date: 2023-07-01 date · International Plumbing Code edition: 2021 edition (First printing (March 2020); effective May 15, 2023 as adopted by the Colorado Examining Board of Plumbers) · International Fuel Gas Code edition: 2021 edition (First printing; effective May 15, 2023 as adopted by the Colorado Examining Board of Plumbers)

    “These minimum requirements are to be applied to all construction at state agencies and institutions of higher education owned facilities.”
    One more reviewed finding on this topic
    • Partial — Construction at Colorado state agencies and institutions of higher education owned facilities under the Colorado State Buildings Program and other state authorities.
      “Approved building codes and standards are adopted by the Office of the State Architect (herein referred to as State Buildings Program (SBP)) and other state authorities, and are identified below. These minimum requirements are to be applied to all construction at state agencies and institutions of higher education owned facilities.”
  • InspectionsRequired

    All reviewed Colorado State Buildings Program construction projects subject to state building-code compliance review.

    • The policy states that all reviewed construction projects are inspected for building-code compliance.
    • Required inspections are identified on the Building Inspection Record and may include building, special, fire, plumbing, electrical, boiler, elevator, and health-department inspections as applicable.
    • Local fire districts and other state authorities may have separate inspection responsibilities.
    • The policy applies to state buildings and state projects, not uniformly to every private project in Colorado.
    “All reviewed construction projects shall be inspected for building code compliance.”
  • Building heightDistrict specific (with conditions)

    Municipal zoning districts in Colorado where the municipality adopts building-height or story regulations.

    • The applicable height or story limit is determined by the municipality's zoning regulations and district classification.
    • The statute provides authority but no statewide numeric height limit.
    • Height restrictions do not apply to existing buildings under the cited municipal zoning authority, except as stated for new growth of vegetation.

    building height or number of stories: local regulation (No statewide numeric limit specified)

    “the governing body of each municipality is empowered to regulate and restrict the height, number of stories, and size of buildings and other structures”
  • Tiny homesAllowed (with conditions)

    Colorado Division of Housing-regulated tiny homes intended for residential occupancy and long-term living.

    • Plans must be submitted to the Colorado Division of Housing for approval before construction of the units.
    • The unit must satisfy applicable Colorado-adopted codes and standards and local zoning requirements.
    • Tiny home units are certified for the specific site where installed; relocation to another Colorado site requires the applicable design criteria, and design differences require revisions.

    foundation types: permanent or temporary

    “Tiny homes are approved for long term living”
  • Manufactured homesAllowed (with conditions)

    Installation and resulting residential use of HUD-code manufactured homes and mobile homes in Colorado, subject to Colorado Division of Housing requirements and local zoning or building requirements.

    • HUD homes must be certified by the applicable State Administrative Agent for installation in Colorado; imported units are monitored by the State Administrative Agent of the state from which they are imported, rather than necessarily by Colorado's SAA.
    • A HUD home may be installed anywhere in Colorado only where local zoning allows it.
    • Local jurisdictions may require site mitigation to meet local wind and snow loads, but the mitigation cannot directly affect or change the construction of the home itself.
    • The Division of Housing regulates installation and installation inspections for HUD homes; mobile-home foundation and structural construction requirements are regulated by local jurisdictions with active building departments.
    • The state minimum HUD design criteria listed by the source are Wind Zone 1, Thermal Zone 3, and Middle Roof Load Zone (30 psf).

    wind zone: 1 zone · thermal zone: 3 zone · roof load zone: 30 psf (Middle Zone)

    “HUD homes [...] can be installed anywhere in Colorado as long as the local zoning allows for it.”
  • Accessory dwellingsAllowed (with conditions)

    One accessory dwelling unit as an accessory use to a single-unit detached dwelling in a Colorado subject jurisdiction where single-unit detached dwellings are allowed.

    • The rule applies to a subject jurisdiction: either a municipality with a population of at least 1,000 within a metropolitan planning organization, or the portion of a county within a census-designated place of at least 40,000 people that is also within a metropolitan planning organization.
    • The subject jurisdiction must allow the ADU through an administrative approval process.
    • The rule applies on or after June 30, 2025.
    • The state requirement does not establish that every Colorado municipality or county area is a subject jurisdiction.

    maximum required ADUs per single-unit detached dwelling: 1 unit · effective date: >= 2025-06-30 · qualifying municipality population: >= 1000 persons (municipality must also be within a metropolitan planning organization) · qualifying census-designated-place population: >= 40000 persons (county portion must also be within a metropolitan planning organization)

    “Section 1 requires a subject jurisdiction, on or after June 30, 2025, to allow, subject to an administrative approval process, one accessory dwelling unit”
  • Who permits septicMixed

    On-site wastewater treatment systems statewide in Colorado.

    • The state establishes minimum standards through the Water Quality Control Commission.
    • Every local board of health must adopt detailed OWTS rules within its jurisdiction.
    • Local public health agencies and local boards of health have primary enforcement responsibility; the department may assume functions if a local agency substantially fails to administer and enforce the law.
    “Every local board of health in the state shall develop and adopt detailed rules for on-site wastewater treatment systems within its area of jurisdiction.”
  • Septic permitRequired

    Construction, alteration, installation, repair, or use of an OWTS statewide when the building or structure is not serviced by a sewage treatment works.

    • The permit is issued by the applicable local public health agency under local board-of-health rules.
    • A person may not construct, alter, install, or permit use of an OWTS without first applying for and receiving the required permit.
    • Local boards of health may prohibit OWTS permits in defined areas where additional systems may create a public-health or water-quality hazard.
    “Constructs, alters, installs, or permits the use of any on-site wastewater treatment system without first applying for and receiving a permit as required under this article;”
  • Septic inspectionRequired

    OWTS construction, installation, alteration, or repair statewide before the system is placed in use, plus operating inspections when authorized under applicable rules.

    • A final inspection must occur after permitted work is completed and before the system is placed in use.
    • The local public health agency or its designated professional engineer determines compliance with the permit, statute, and applicable rules.
    • For a building not serviced by a sewage treatment works, an occupancy permit requires final OWTS inspection and local agency approval.
    “Final inspection of a system to be made by the local public health agency or its designated professional engineer after construction, installation, alteration, or repair work under a permit has been completed, but before the system is placed in use, to determine that the work has been performed in accordance with the permit and that the system is in compliance with this article and the rules adopted under this article;”
  • Off-grid sanitationLimited

    Sanitation for dwellings and occupied structures statewide that is provided without connection to a sewage treatment works.

    • The structure must have adequate facilities for sanitary disposal of sewage.
    • An OWTS may be used subject to applicable permit, inspection, construction, installation, alteration, and use requirements.
    • Construction of new cesspools is prohibited.
    • Septage removed during maintenance or cleaning must be disposed of at an approved site and in an approved manner.
    “No person shall construct or maintain any dwelling or other occupied structure that is not equipped with adequate facilities for the sanitary disposal of sewage.”
  • Well permitRequired

    Every new groundwater-diverting well in Colorado, including residential wells, subject to statutory exemptions and basin-specific rules.

    • The Division of Water Resources administers groundwater permitting and issues permits.
    • Applicants must complete the appropriate application and pay the associated fee.
    • Statutory exemptions and additional Denver Basin or Designated Basin rules may affect the requirement or permit conditions.
    • In many areas, a well may also require an augmentation plan if its priority is not sufficient to divert in priority.

    complete-application review time: <= 49 days (DWR states review of complete new and replacement applications may take up to 49 days)

    “Every new well in the state that diverts groundwater must have a well permit.”
  • Mandatory utility hookupConditional

    Residential or other occupied structures statewide that are not serviced by a sewage treatment works.

    • Colorado law conditions building and occupancy permitting on either service by a sewage treatment works or an approved OWTS process.
    • If the structure is not serviced by a sewage treatment works, the local public health agency must issue the OWTS permit before building construction or remodeling approval, and must complete a final inspection and approve the installation before occupancy approval.
    • This claim does not establish a universal statewide mandate to connect to a particular municipal water or sewer provider.
    “A permit to construct or remodel a building or structure that is not serviced by a sewage treatment works until the local public health agency has issued a permit for an on-site wastewater treatment system;”
  • Subdividing landRegulated (with conditions)

    Division of land and creation of interests subject to Colorado county subdivision law.

    • Divisions creating parcels of at least 35 acres each are excluded when none is intended for use by multiple owners.
    • Additional statutory exclusions include certain 35-acre-per-interest divisions, court or eminent-domain divisions, security instruments, investment entities, cemetery lots, severed mineral or water interests, certain joint-tenancy or tenancy-in-common interests, parcel combinations, contingent sale contracts, and cluster developments.
    • A board of county commissioners may exempt a division from the subdivision definition by rule, regulation, or resolution if it determines the division is not within the purposes of the subdivision statute.
    • Local county subdivision regulations and review procedures still determine administration.

    parcel-size exclusion: >= 35 acres (Each parcel must be at least 35 acres and none may be intended for use by multiple owners.) · minimum area per interest for listed exclusion: >= 35 acres per interest (Subject to the statutory exceptions and anti-evasion language.)

    “"Subdivision" or "subdivided land" means any parcel of land in the state which is to be used for condominiums, apartments, or any other multiple-dwelling units, unless such land when previously subdivided was accompanied by a filing which complied with the provisions of this part 1 with substantially the same density, or which is divided into two or more parcels, separate interests, or interests in common, unless exempted under paragraph (b), (c), or (d) of this subsection (10).”
  • Driveway accessRequired

    Direct residential access from a property to a Colorado state highway, and construction, relocation, closure, modification, or change in use of access points to state highways.

    • Direct access from a house to a state highway requires an access permit.
    • Some state-highway access categories require access from a lesser street or by easement from a parent parcel whenever possible.
    • Level 1 permits cover single-family residential/agricultural permits; Level 2 covers commercial property and developments exceeding 20 vehicular trips per day without roadway improvements; Level 3 covers commercial property requiring roadway improvements.
    • Level 1 fees are $50, Level 2 fees are $100, and Level 3 fees are $300.
    • No fees are charged to local government applications or political subdivisions.
    • There is no upfront charge to review an Access Permit Application.
    • The permittee is responsible for roadway-improvement costs required with issuance of an access permit.
    • Performance-bond requirements apply only to private projects; local agencies are not required to comply, although CDOT regions may require a bond at their discretion.

    Level 1 access permit fee: 50 USD (Single-family residential/agricultural permits) · Level 2 access permit fee: 100 USD (Commercial property permits and developments exceeding 20 vehicular trips per day without roadway improvements) · Level 3 access permit fee: 300 USD (Commercial property permits requiring roadway improvements)

    “If you want the house to have direct access off of the state highway, then you will need an access permit.”
  • Building in a floodplainRequired

    Development in floodplain areas subject to Colorado floodplain-management requirements, and state-owned land in counties or municipalities that do not participate in the National Flood Insurance Program.

    • Local floodplain regulations must equal or exceed FEMA National Flood Insurance Program minimum design and construction criteria.
    • Local floodplain regulations must comply with Colorado Water Conservation Board rules and regulations for regulatory floodplains.
    • The state program applies to development on state-owned land in counties and municipalities that do not participate in the National Flood Insurance Program.
    “Local government floodplain management regulations for development in floodplain areas must equal or exceed the federal emergency management agency's national flood insurance program's (national flood insurance program) minimum design and construction criteria and must comply with the Colorado water conservation board's (CWCB) rules and regulations for regulatory floodplains in Colorado.”
  • Short-term rentalsLimited

    Short-term rentals statewide, defined in the cited official source as lodging-unit rentals for fewer than 30 days.

    • There is no statewide STR regulatory scheme.
    • Boards of county commissioners may license and regulate STR owners or agencies and set license fees, terms, issuance, and revocation procedures.
    • Home-rule municipalities and private contracts or homeowners' association covenants may impose additional restrictions.

    maximum rental duration for STR definition: < 30 days

    “There are no statewide regulations regarding STRs. As established through House Bill 20-1093, state law allows for boards of county commissioners (BOCCs) to license and regulate an owner or owner’s agency and to fix the fees, terms, and manner for issuing and revoking licenses.”
  • Permit processPartial

    Colorado's statewide legal framework for land-use permitting and development regulation.

    • Most land-use decisions, including building-code adoption, are driven by local governments rather than the state.
    • Local governments may develop permitting procedures and standards for development under 1041 regulations.
    • The cited statewide source does not establish a uniform statewide permit application, review, approval, or inspection procedure.
    “Colorado is a “local control” state when it comes to land use planning authority (Local Government, 2012). This means that most land use decisions such as adoption of zoning and building codes are driven by local governments, not by the state.”
  • Campground & park staysAllowed (with conditions)

    Temporary overnight camping, including parking a motor home or traveler, on land and water under the control of Colorado Parks and Wildlife, including state parks and state recreation areas.

    • The source addresses lands and waters under the control of the Division of Parks and Wildlife, not all public or private land statewide.
    • Camping includes parking a motor vehicle, motor home, or traveler for the apparent purpose of overnight occupancy.
    • A commission-issued permit may be required; the statute defines permits to include campground permits and electrical hookup permits.
    • The state may charge fees for required passes or permits for use of any state park or state recreation area where supervision, maintenance, or specified facilities warrant a fee.

    overnight occupancy: true (Camping definition includes the parking of a motor vehicle, motor home, or traveler for the apparent purpose of overnight occupancy.) · permit types: campground permits; electrical hookup permits

    “Develop state parks and state recreation areas suitable for such recreational activities as camping, [...] "Camping" means [...] the parking of a motor vehicle, motor home, or traveler”
  • county zoning authorityGeneral

    Colorado counties adopting zoning plans for all or any part of unincorporated territory.

    • The county planning commission may make the zoning plan; in a county having a county planning commission, it must do so upon order by the board of county commissioners.
    • The zoning plan may regulate districts or zones, including building location, height, bulk, size, lot coverage, lot size, open spaces, population density, building and land uses, and access to sunlight for solar energy devices.
    • The plan may include regulations for uses on or along storm or floodwater runoff channels or basins only when the channel or basin has been designated and approved by the Colorado water conservation board, to lessen or avoid hazards from storm or floodwaters.
    • The statute applies to unincorporated territory and does not describe incorporated cities or towns as within this county zoning grant.
    “zoning all or any part of the unincorporated territory within such county”
  • county building authorityGeneral

    Colorado counties adopting and enforcing building codes and requiring building permits in designated unincorporated areas.

    • A board of county commissioners may adopt a building code in all or part of the county, but the area must not be within the limits of an incorporated city or town.
    • Buildings or structures used solely to shelter agricultural implements, farm products, livestock, or poultry may be excepted from the building code and permit requirement.
    • Before adoption, the county planning commission may designate part or all of the county for the building code upon request from the board of county commissioners; the board must hold a public hearing and publish notice once weekly for four consecutive weeks.
    • After adoption of the building code, construction, reconstruction, alteration, or remodeling in the designated area requires a building permit, except for the agricultural-shelter exception.
    • The board must fix a reasonable schedule of building-permit fees; no permit fee may be charged unless a qualified inspector actually performs an inspection.
    • Plans must conform to the building code, and plans and specifications generally must bear the seal of a Colorado-licensed architect or engineer unless exempted by section 12-120-403.
    • Every county adopting or updating a building code must adopt and enforce an energy code meeting or exceeding one of the three most recent International Energy Conservation Code versions under section 30-28-211.
    • The 2025 amendment to section 30-28-204 is effective January 1, 2026 and adds accessibility requirements for substantially amended or updated county building codes, with an exception for compliant one- and two-family dwellings and townhomes.
    “A board of county commissioners is authorized to adopt ordinances and a building code”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Owner-builder exemption — Owner-builder exemption from county construction or land-use permits.
  • Setbacks — Building setbacks under Costilla County land-use regulations.
  • Lot coverage — Lot-coverage limits under Costilla County land-use regulations.
  • Agricultural exemption — Agricultural exemptions from Costilla County land-use or construction permits.

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.

Water rights & wells in Costilla County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Colorado’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt up to a limit

A household obtains water via a permit-exempt small-capacity well (15 gpm) under CRS 37-92-602 outside designated basins or CRS 37-90-105 inside them; on a 35-acre-plus lot limited outside/stock/1-acre irrigation is allowed.

Limit: Household-use-only well: 15 gpm, ≤0.33 acre-ft/yr, indoor only. Domestic well on a 35+ acre tract: 15 gpm, ≤1 acre-ft/yr.

Colorado DWR — Guideline 2023-1, Exempt & Small-Capacity Wells ↗
  • San Luis Valley / Rio Grande Basin (Water Division 3) — groundwater rules & RGWCD subdistrictsmajority of county

    Upper Rio Grande Basin governed by the 2021 Rules Governing Withdrawal of Groundwater in Division 3 and the Rio Grande Water Conservation District subdistricts (No. 1-6 + Trinchera). Confined and unconfined aquifers are over-appropriated; new consumptive appropriations are effectively unavailable, wells must replace injurious depletions, and subdistricts impose pumping curtailment/fees with State-Engineer curtailment for unresolved depletions.

    Colorado DWR — Designated Basins / Division 3 ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Colorado state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Costilla County, Colorado

Is Costilla County a good place to live off-grid or homestead?

Costilla County scores 69/100 on the Bolthole Index, a strong county profile. Its strengths: manageable long-term carry cost and deep seclusion — about 2,190 people within 15 miles. Watch-outs: more administrative friction around building and land use.

Do you need a building permit in Costilla County, Colorado?

Costilla County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Costilla County Planning and Zoning / Environmental Health (OWTS). Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Costilla County, Colorado?

Land in Costilla County runs about $996 per acre, based on the latest county data.

What is the water situation in Costilla County?

Costilla County gets about 17.5" of rain a year, with severe drought in roughly 34.2% of years. On water rights, Costilla County lies in the San Luis Valley / Rio Grande Basin (Water Division 3) — groundwater rules & RGWCD subdistricts — Upper Rio Grande Basin governed by the 2021 Rules Governing Withdrawal of Groundwater in Division 3 and the Rio Grande Water Conservation District subdistricts (No. 1-6 + Trinchera). Confined and unconfined aquifers are over-appropriated; new consumptive appropriations are effectively unavailable, wells must replace injurious depletions, and subdistricts impose pumping curtailment/fees with State-Engineer curtailment for unresolved depletions..

How remote is Costilla County?

A typical private-land location has about 2,190 people within 15 miles and 183,373 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Off-grid gear

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

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How Costilla compares in Colorado

Compare side-by-side →See all 64 Colorado counties ranked →