Boulder building permits
VerifiedDepartment contacts, adopted codes, permit types, fees, and gotchas for Boulder, Colorado.
Last verified 2026-06-30 · Source · Embed this page’s badge · Version history
Building department
- Address
- 1101 Arapahoe Avenue, Boulder, CO 80302
- Phone
- 303-441-1880
- Office hours
- Tuesday–Friday, 10:00 a.m.–4:00 p.m.
- Website
- Official site
- Permit portal
- Apply online at Boulder's portal
Inspection guide
See how inspections work in Boulder — sequence, scheduling & re-inspection fees.
Codes adopted
Colorado has no statewide-mandated building code edition. Under the Colorado Constitution's home-rule provisions (art. XX, home rule for municipalities since 1902; home rule for counties since 1970), building codes and zoning are an enumerated home-rule charter power, so cities and counties adopt and amend their own construction codes independently — predominantly the I-Codes, with editions and local amendments varying by jurisdiction. The one statewide floor is for energy: HB22-1362 (2022) created the Energy Code Board (jointly appointed by the Colorado Energy Office and the Department of Local Affairs) and requires that, on or after July 1, 2023 and before July 1, 2026, any municipality or county that adopts or updates a building code must adopt and enforce an energy code achieving performance equivalent to or better than the 2021 IECC together with the board's Model Electric Ready and Solar Ready Code (which includes electric-ready, EV-ready, and solar-ready provisions); from July 1, 2026 onward the floor shifts to the board's Model Low Energy and Carbon Code or an equivalent. Electrical and plumbing permitting defaults to the Colorado State Electrical Board and State Plumbing Board (within DORA's Division of Professions and Occupations) — the state issues permits and inspects statewide except in counties/jurisdictions that operate their own certified Electrical or Plumbing Inspection Program, in which case the local program has authority instead. Always confirm the currently adopted code edition, local amendments, and inspection authority (state board vs. local program) with the specific jurisdiction before submitting plans.
- 2024 International Building Code (IBC) family — City Council adopted the 2024 International Code Council (ICC) suite of codes with local amendments on March 20, 2025 (Ordinance 8684); effective August 1, 2025; local amendments codified in Title 10 of the Boulder Revised Code
- 2024 International Residential Code (IRC) — part of the 2024 ICC suite adopted March 20, 2025, effective August 1, 2025, with Boulder amendments in BRC Title 10
- 2024 International Mechanical Code (IMC) — part of the 2024 ICC suite, effective August 1, 2025
- 2024 International Plumbing Code (IPC) — part of the 2024 ICC suite, effective August 1, 2025
- 2024 International Fuel Gas Code (IFGC) — part of the 2024 ICC suite, effective August 1, 2025
- 2024 International Fire Code (IFC) — part of the 2024 ICC suite, effective August 1, 2025
- 2024 City of Boulder Energy Conservation Code (CoBECC) — Boulder's own locally-amended energy code (not a straight IECC adoption), effective December 1, 2024; published on ICC Digital Codes as COBECC2024P1; mandatory-measures checklist now required to be integrated into commercial/multifamily plan sets
- 2023 NFPA 70 National Electrical Code (NEC), as amended by the City of Boulder — effective August 1, 2023; amendments in BRC Title 10
- 2021 International Wildland-Urban Interface Code (IWUIC) — applies to properties in Boulder's designated wildland urban interface zone per the city's Structure Protection Plan / Wildland Fire program (edition as referenced in Boulder's Zoning and Permitting FAQ, Oct. 2020; confirm current edition at time of application)
Permit types & fees
Residential Building Permit (New Construction)
Required for new single-family detached dwellings, duplexes, townhomes, and other one- and two-family residential new construction in the City of Boulder. Reviewed against the 2024 IRC (effective Aug. 1, 2025) and the 2024 City of Boulder Energy Conservation Code (CoBECC, effective Dec. 1, 2024), plus Boulder Revised Code Title 9 zoning and Title 10 building amendments.
Residential Addition / Remodel Permit
Required for additions, interior remodels, basement finishes, and structural alterations to existing one- and two-family dwellings and townhomes in the City of Boulder. Uses the same valuation-based Building Permit Fee schedule as new construction.
Electrical Permit
Required for electrical installations, alterations, and service changes in the City of Boulder. The CITY issues and reviews electrical permits directly (submitted via the CSS Portal) — Boulder is not routed through a separate statewide DORA/DPO permit-issuance process, but it does require and verify State of Colorado electrical licensure as a prerequisite ('contemporaneous review'). Governed by the 2023 NEC as amended by the City (effective Aug. 1, 2023).
Plumbing Permit
Required for plumbing installations, alterations, and repairs in the City of Boulder. The CITY issues and reviews plumbing permits directly (submitted via the CSS Portal) — Boulder requires and verifies State of Colorado plumbing licensure as a prerequisite ('contemporaneous review'), rather than the State DORA/DPO board issuing permits itself. Governed by the 2024 International Plumbing Code (IPC), effective August 1, 2025.
Mechanical / HVAC Permit
Required for heating, cooling, ventilation, and fuel-gas equipment installations in the City of Boulder. Governed by the 2024 International Mechanical Code (IMC) and 2024 International Fuel Gas Code (IFGC), both effective August 1, 2025. Residential HVAC and solar-thermal permits can be submitted online via the CSS Portal.
Roofing Permit (Reroof)
Required for roof replacement (tear-off and reroof) on residential and commercial buildings in the City of Boulder. Residential 'Roofing Replacement' permits can be submitted online via the CSS Portal; fee follows the standard valuation-based Building Permit Fee schedule.
Solar PV Permit
Required for installation of rooftop or ground-mounted solar photovoltaic systems in the City of Boulder. Solar PV is processed as an Electrical Permit (not a separate solar-specific permit category); small roof-mounted systems under 10 kW are typically eligible for over-the-counter processing when the application package is complete. Solar thermal (solar water heating) is processed separately as a Mechanical Permit.
EV Charger / EVSE Permit
Installation of a Level 1 or Level 2 electric vehicle charging station (EVSE) at a residential or commercial property in the City of Boulder is permitted as an Electrical Permit — there is no separate EV-charger-specific permit type or fee line item in the city's published fee schedule. As a 'covered municipality' under Colorado HB24-1173 (population over 10,000), Boulder was required to either adopt the state's EV Charging Model Land Use Code, adopt its own standards with an applicant checklist, or formally opt to keep its existing process by December 31, 2025; no distinct EV-charger permitting page, checklist, or model-code adoption notice was found on bouldercolorado.gov as of this research, indicating the city continues to route EV charger installs through its standard Electrical Permit / CSS Portal process rather than a new dedicated pathway.
Accessory Dwelling Unit (ADU) Permit
Required for construction of a new attached or detached ADU on a residential property in the City of Boulder. ADUs are permitted by-right in most residential zoning districts (except RH-6, MH, BMS, BCS, IS-1, and IM). As of September 1, 2023, ADUs are reviewed and approved through the standard building permit process without a prior administrative review step, and off-street parking and owner-occupancy requirements were removed for all ADUs.
Demolition Permit
Required for demolition of structures in the City of Boulder. A multi-step process requiring asbestos testing (now administered as part of the building-permit process), utility disconnects, and — for full-structure demolitions and Level 4 alterations — an approved Sustainable Deconstruction Plan demonstrating diversion of building materials from the landfill. Non-designated structures over 50 years old also require a separate Historic Preservation Demolition Review.
Commercial Tenant Improvement Permit
Required for interior remodels, additions, and tenant improvements in commercial, multifamily, and mixed-use buildings in the City of Boulder. Governed by the 2024 IBC family and the 2024 City of Boulder Energy Conservation Code (CoBECC), with the CoBECC Mandatory Measures Checklist now required to be integrated directly into the plan set.
Deck / Covered Patio Permit
Required for construction of attached or free-standing decks on one- and two-family dwellings and townhomes in the City of Boulder. Reviewed against the 2024 IRC and Boulder Revised Code Title 9 zoning (setbacks, building coverage exemptions for low decks).
Sign Permit
Required before installing or altering most permanent signs on commercial, institutional, or multi-family property in the City of Boulder, per Boulder Revised Code Section 9-9-21. Only a City of Boulder-licensed sign contractor (Class A or Class B) may obtain the permit and install the sign; fees are tiered by review complexity (BRC 4-20-21(b)) rather than a single flat rate, ranging from $92 for a sign needing no plan check to $344 for one needing both plan check and electrical review.
Fire Sprinkler and Fire Alarm System Permit
Required for installation of fire sprinkler/suppression systems, kitchen-hood suppression systems, and fire alarm detection systems in the City of Boulder. Fire contractor licensing is administered directly by the City of Boulder Fire Department — separately from the Planning & Development Services Building Division that handles most other trade contractor licenses. Permit fees are published in the same 2026 Planning & Development Services Schedule of Fees used for building/mechanical permits, but split by track under BRC 4-20-52(c): the Mechanical Permit Fee schedule applies to fire suppression, sprinkler systems, and hoods, while the valuation-based Building Permit Fee schedule applies to fire alarm detection systems. Reviewed against the 2024 International Fire Code (IFC), part of the 2024 ICC suite adopted March 20, 2025 (Ordinance 8684), effective August 1, 2025.
Change of Occupancy / Change of Use Permit
Required whenever an existing building or space's use or occupancy classification changes in the City of Boulder, whether alone or as part of a tenant finish/remodel-alteration project. Billed as a distinct $81.00 Change of Use Fee (BRC 4-20-4(f)(5)) due at the time of the change-of-use request, creditable toward the Building Permit Fee if a permit application is submitted and issued within 90 days. Requires a code analysis and, for existing buildings, an accessibility-compliance analysis under the city's adopted Existing Building Code — Boulder's own Detailed Multi-family, Commercial, Non-Residential or Mixed-Use Guide still instructs applicants to demonstrate compliance with '2018 IEBC,' though the city's currently codified edition (per the 2024 ICC suite adopted via Ordinance 8684, effective Aug. 1, 2025, BRC Title 10 Chapter 5.6) is the 2024 International Existing Building Code.
New residential construction activity
New privately-owned residential construction onlyHousing units authorized by building permits for new privately-owned residential construction — this is not total permit volume (no commercial permits or remodels).
- Latest month (2026-05)
- 3units
3 buildings · $771,032 valuation
- Trailing 12 months
- 39units
8 of 12 months reported · #40 in Colorado coverage by units
- Year to date (2026 YTD through 2026-05)
- 43units
43 buildings · $17.1M valuation
5 month(s) reported to Census
- Full year 2025
- 336units
35 buildings · $86.7M valuation
Source: U.S. Census Bureau, Building Permits Survey (BPS), 2026-05 vintage. Census survey data — separate from the permit-requirements verification above. All Colorado building activity
Tips & gotchas
- Boulder is nationally known for stringent local energy/green building requirements: it writes its OWN Energy Conservation Code (CoBECC, currently the 2024 edition effective Dec. 1, 2024) rather than adopting the IECC verbatim, and separately enforces SmartRegs, a mandatory minimum energy-efficiency standard for ALL licensed rental housing (single-family and multifamily) as a condition of rental licensing — SmartRegs is enforced through the rental-licensing process, not the construction building permit.
- City Council adopted the full 2024 International Code Council (ICC) suite (IBC, IRC, IMC, IPC, IFGC, IFC) on March 20, 2025 via Ordinance 8684, effective August 1, 2025 — always confirm the current adopted edition, since some older official city publications (e.g., the Oct. 2020 Zoning and Permitting FAQ) still reference 2012 IRC-based design criteria.
- The City of Boulder ISSUES ITS OWN electrical and plumbing permits directly (via the CSS/EnerGov portal) — it does not defer permit issuance to the Colorado DORA/DPO state board. However, Boulder requires and actively verifies ('contemporaneous review') that contractors hold the underlying State of Colorado Electrical Contractor's Card / master electrician license (electrical) or Colorado State Plumbing Examiner's Board master plumber license (plumbing) as a prerequisite to the city's own contractor license.
- Design wind speed is a notable local amendment: Boulder's current Residential Building Permit Guide states 150 mph (3-second gust) east of Broadway and 165 mph west of Broadway — significantly higher than the 120/130 mph figures published in the city's older (2020) Zoning and Permitting FAQ. This discrepancy reflects the 2024 code-cycle wind-criteria update; other design values (ground snow load 30 psf, frost depth 32 in, Seismic Design Category B) are sourced from the 2020 FAQ (the most recent official published table found) and should be reconfirmed against BRC Title 10 or Planning & Development Services at time of application.
- The City of Boulder is a home-rule city with its OWN Planning & Development Services department — distinct and separate from unincorporated Boulder County, which is administered by Boulder County's Community Planning and Permitting Department (bouldercounty.gov) under different code adoption and fee schedules. Do not conflate the two.
- Homeowner self-permitting in Boulder is narrower than in many other Colorado cities: it applies ONLY to work on a single-family detached dwelling (and its accessory structures, EXCLUDING a detached ADU) that the individual owns and occupies as their primary residence, limited to one property per calendar year.
- Solar PV is permitted as an Electrical Permit (flat fee $69.60 residential / $139.20 nonresidential-multifamily); solar thermal (solar water heating) is a separate Mechanical Permit at the same flat-fee amounts — do not confuse the two tracks.
- Full-structure demolition and Level 4 Alteration projects require an approved Sustainable Deconstruction Plan (via Green Halo Systems) demonstrating diversion of building materials from the landfill — a distinctive Boulder sustainability requirement layered on top of standard demolition permitting.
- As of September 1, 2023, ADUs go directly through the standard building permit process (no separate administrative review), and off-street parking plus owner-occupancy requirements were removed citywide for all ADUs — though the homeowner self-permit exception still does not extend to detached ADU construction.
- Boulder's combined City + County sales/use tax on building-permit construction materials is 9.195% (3.860% city + 1.335% county), pre-paid at permit issuance based on an estimated 50% materials share of total project valuation.