Residential Addition / Interior Remodel Permit in Lyons, Colorado

Lyons requires a residential addition / interior remodel permit for: Plans must comply with the 2021 IRC as locally adopted and the Town's Climatic and Geographic Design Criteria; Structural plans stamped by a structural engineer required if the scope involves new framing, foundations, or removed structural elements; 2021 IECC energy code compliance required for the affected/new area; Additions of 500 sq ft or more trigger Wildfire Resiliency Code compliance for permits applied for on or after July 1, 2026; Floodplain Development Permit required in addition if the parcel is within the regulatory floodplain. If your project isn't listed, confirm with Town of Lyons Planning and Building Department (permit processing, plan review, and inspections contracted to SAFEbuilt) at 303-823-6622 ext. 25 (Town Planning and Building Director); 970-545-3512 (SAFEbuilt Permit Technician); 970-545-3555 (SAFEbuilt Chief Building Official); 303-774-0454 (Inspection Request Line) before starting work.

In Lyons, the published Building Permit Fee (same valuation-based schedule as new construction) is: $135 minimum, scaling per the valuation tiers in the Town's fee schedule (updated 6.16.25). Additional published fees: Plan Review Fee — 65% of the Building Permit Fee; Boulder County Open Space & Recycling Tax — (Valuation x 45%) x 1.185%; Park Fund Use Tax and General Fund Use Tax — (Valuation x 45%) x 3%; Park Tax (new living space only, including basements) — $2.20 per sq ft of NEW living space added. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Lyons does not publish a plan-review timeline for this permit. Contact Town of Lyons Planning and Building Department (permit processing, plan review, and inspections contracted to SAFEbuilt) at 303-823-6622 ext. 25 (Town Planning and Building Director); 970-545-3512 (SAFEbuilt Permit Technician); 970-545-3555 (SAFEbuilt Chief Building Official); 303-774-0454 (Inspection Request Line) for current turnaround.

You'll need: Building Permit Application; Architectural/floor plans and structural plans (as applicable to scope). See the required-documents checklist on this page for details on each.

Lyons requires 4 inspection(s) for a residential addition / interior remodel permit, in order: Foundation (additions with new footings only), Rough Frame, Rough Electrical / Plumbing / Mechanical, Final Inspection. Schedule each through Town of Lyons Planning and Building Department (permit processing, plan review, and inspections contracted to SAFEbuilt) (303-823-6622 ext. 25 (Town Planning and Building Director); 970-545-3512 (SAFEbuilt Permit Technician); 970-545-3555 (SAFEbuilt Chief Building Official); 303-774-0454 (Inspection Request Line)).

Apply through Town of Lyons Planning and Building Department (permit processing, plan review, and inspections contracted to SAFEbuilt) at 432 5th Avenue, Lyons, CO 80540 (PO Box 49). Phone: 303-823-6622 ext. 25 (Town Planning and Building Director); 970-545-3512 (SAFEbuilt Permit Technician); 970-545-3555 (SAFEbuilt Chief Building Official); 303-774-0454 (Inspection Request Line), email: Lritchie@townoflyons.com (Lisa Ritchie, Planning and Building Director); dtoberman@safebuilt.com (Danielle Toberman, Permit Technician); tmoroney@safebuilt.com (Tim Moroney, Chief Building Official). Office hours: Monday-Thursday 8:00 a.m.-4:30 p.m.; Friday 8:00 a.m.-noon; closed holidays. Town of Lyons main line 303-823-6622.. Official information: https://www.lyonscolorado.com/834/Building-Department.

Lyons, Colorado has adopted: 2021 International Building Code (IBC) — currently in effect per the Town of Lyons Building Department page and the Town's published Adopted Codes flyer; 2021 International Residential Code (IRC); 2021 International Plumbing Code (IPC); 2021 International Mechanical Code (IMC); 2021 International Fuel Gas Code (IFGC); 2021 International Energy Conservation Code (IECC) — the Town's 2025 Residential Submittal Checklist explicitly requires '2021 IECC Energy Code compliance for the specific home being proposed' via REScheck or an Energy Compliance Report; 2021 International Fire Code (IFC); 2021 International Property Maintenance Code (IPMC); 2021 International Existing Building Code (IEBC); 2023 National Electrical Code (NEC); Transition note: the Town of Lyons Building Department page (fetched 2026-07-06) states the 2021 ICC series and 2023 NEC apply 'until July 1, 2026,' with a 2024 ICC series adopted to take effect July 1, 2026. As of this file's lastVerified date (2026-07-06, five days after that effective date), the Town's own Adopted Codes flyer (townoflyons.com/DocumentCenter/View/932/Lyons-Design-Criteria) and Building Department page still list the 2021 series/2023 NEC as the current codes with no updated flyer found reflecting the 2024 series live — recommend confirming directly with SAFEbuilt/the Building Department (970-545-3555) whether the 2024 ICC series has been operationally rolled out before finalizing a code analysis for any permit filed on or after 2026-07-01.; State of Colorado Wildfire Resiliency Code (Ordinance 1210) — effective July 1, 2026, adopted townwide for Class 1 and Class 2 requirements applicable to new commercial/residential construction and qualifying alterations to existing structures (roof replacement 25%+, exterior wall replacement 25%+, additions adding 500+ sq ft, and new/replacement fences or decks); per the Town of Lyons Wildfire Resiliency Code Requirements page.. Local amendments apply — see the Lyons overview page for the full list.

Only if the addition increases the building's footprint by 500 square feet or more, and only for permits applied for on or after the code's July 1, 2026 effective date.