Residential Building Permit (New Construction, Single-Family/Duplex/Townhouse) in Aspen, Colorado

Aspen requires a residential building permit (new construction, single-family/duplex/townhouse) for: Reviewed under the 2021 IBC as amended by the City of Aspen; the IRC has NOT been adopted and is not applied to single-family/duplex/townhouse projects; Ground snow load of 100 psf applies per the City's published Roof/Re-Roof Application Checklist design criteria; a Letter of Structural Integrity from a Structural Engineer is required if roof insulation does not meet this load rating; Classified as a 'New Major Permit' (Queue Designator priority level 1) since new construction changes floor area, height, net livable, or net leasable area — this is the lowest-priority tier among initial/new applications, though First Major Change Orders share the same level-1 weight, and Major Change Orders after the first (0.9) and Red Tag Clearance (0.8) rank lower still; All contractors must hold a current City of Aspen contractor license; Asbestos test and clearance reports, or a State Asbestos Demolition Approval Notice, required per the Building Permit Application Checklist; Special Inspection and Testing Agreement, Verification of Structural Integrity, and a Soils Report required for new construction per the Building Permit Application Checklist; If the project meets or exceeds the City's 40% exterior-surface-area demolition threshold, a demolition allotment must be secured before the building permit can proceed (capped at 6 per calendar year, first-come first-served, plus 2 more for 35-year Aspen homeowners); Applications submitted via the City's Salesforce Permit Portal; Building Support reviews for completeness before issuing submittal fees due. If your project isn't listed, confirm with City of Aspen Community Development Department, Building Division at 970-920-5000 before starting work.

In Aspen, the published Building Permit Fee (valuation-based) is: Computed via the City's Building Permit Fee Estimator (Excel) referencing the current Municipal Code Fee Ordinance (Title 2). Additional published fees: Construction Use Tax — Applies per Municipal Code; not itself published as a flat percentage on the Building Department pages reviewed for this file. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

The City publishes a Round 1 review timeline of 16-18 weeks for New Major Residential permits, beginning once the application is deemed complete and submittal fees are paid. Additional review rounds (if comments are issued) add a further 8-10 weeks per round. These timelines are subject to change based on queue volume.

You'll need: Building Permit Application Checklist for Singlefamily, Duplex, and Townhouse Projects (2021 IBC); Permit Application Signature Packet; Asbestos Test and Clearance Reports / State Asbestos Demolition Approval Notice; Soils Report. See the required-documents checklist on this page for details on each.

Aspen requires 4 inspection(s) for a residential building permit (new construction, single-family/duplex/townhouse), in order: Foundation, Framing, Rough Electrical / Plumbing / Mechanical, Final Inspection. Schedule each through City of Aspen Community Development Department, Building Division (970-920-5000).

Apply through City of Aspen Community Development Department, Building Division at 427 Rio Grande Place, Aspen, CO 81611. Phone: 970-920-5000, email: buildingsupport@aspen.gov. Office hours: City of Aspen main line 970-920-5000. Building Support (permit requirement inquiries, pre-submittal questions): buildingsupport@aspen.gov, Monday-Friday 9:00am-5:00pm. Builder of the Day (building code/regulations questions): builderoftheday@aspen.gov, 970-429-2735, Monday-Friday 8:30am-4:30pm. Planner of the Day (zoning, floor area, net leasable, signage, mountain view plane, exterior design): planneroftheday@aspen.gov, 970-429-2764, walk-in hours Monday-Friday 9:00am-12:00pm. Historic Preservation: HP@aspen.gov, 970-429-2758. Construction hours: Monday-Friday 7:30am-5:30pm, Saturday 9:00am-5:00pm, no construction on Sundays.. Official information: https://aspen.gov/179/Building.

Aspen, Colorado has adopted: 2021 International Building Code (IBC) — adopted by Ordinance #1, 2023 (January 24, 2023), effective for permits submitted March 31, 2023 and later; the IRC has NOT been adopted by the City of Aspen and is not applied — single-family, duplex, and townhouse projects are reviewed under the 2021 IBC as locally amended, per the City's own 'Building Permit Application Checklist for Singlefamily, Duplex, and Townhouse Projects (2021 IBC)'; 2021 International Existing Building Code (IEBC); 2021 International Mechanical Code (IMC); 2021 International Fuel Gas Code (IFGC); 2021 International Plumbing Code (IPC); 2021 International Fire Code (IFC); 2021 International Swimming Pool and Spa Code (ISPSC); 2021 Aspen Energy Code (local amendment/supplement to the IECC); 2023 National Electrical Code (NEC), effective August 1, 2023; 2024 Colorado Wildfire Resiliency Code with local amendments — adopted by Ordinance 6, 2026 (March 25, 2026), effective April 23, 2026; referenced directly in the current Fence Permit Application Checklist (fences within 8 feet of a structure must be noncombustible/ignition-resistant; hedges within 5 feet must use ignition-resistant vegetation); Prior code cycle: 2015-edition IBC/IEBC/IMC/IFGC/IPC/IFC applied to permits submitted between February 2017 and March 2023, with local amendments in Ordinance 40, 2016 (superseded, listed for reference only); Local amendments to all adopted codes are codified in Title 8 (Building and Building Regulations) of the Aspen Municipal Code; Municode's Aspen library is a JavaScript-rendered application that could not be scraped directly in this or the prior session (confirmed again 2026-07-23: raw curl returns only the Angular SPA shell, and the shared browser environment used for the re-chase attempt this session was too unstable to reliably render deep-linked Title pages). However, the City's own 'Currently Adopted Building & Energy Codes' page (aspen.gov/197) directly publishes a 'Climate & Geographical Design Criteria' table (2026-07-23, live-confirmed): Ground snow load 100 psf; Wind Speed/Exposure Category 89 mph / B; Seismic Design Category C; Weathering Severe; Frost line depth 36 inches; Termite None to slight; Decay None to slight; Winter design temp -15°F; Summer design temp 82°F; Ice shield underlayment required Yes; Air Freezing Index 2000; Mean annual temperature 40°F. This resolves the design-criteria gap without needing Title 8/Municode.. Local amendments apply — see the Aspen overview page for the full list.

No. The City of Aspen has not adopted the International Residential Code; single-family, duplex, and townhouse projects are reviewed under the 2021 International Building Code as locally amended, per the City's own Building Permit Application Checklist for these project types.