Do I need a permit for addition or structural alteration in Centennial?
Yes. In Colorado, addition or structural alteration generally requires a permit, and Centennial is no exception.
Additions and structural alterations in Centennial go through full plan review under the 2021 IBC/IRC with local amendments, and plans and payments run through the Centennial Self-Service (CSS) portal. Structural plans must reflect Centennial's amended design criteria of 30 psf non-reducible roof snow load and 115 mph wind speed (Sec. 18-2-30). Contractors and subcontractors must be licensed in the City of Centennial, and a homeowner may pull the permit only if doing the work themselves, occupying the residence, and filing the Homeowner Agreement. Adding to or structurally altering a home requires a building permit and full plan review in Colorado jurisdictions; the exact submittal list and adopted code edition are set locally because there is no statewide code. Electrical and plumbing portions of the work fall under Colorado's state Electrical and Plumbing Boards and require their own state permits and inspections in addition to the local building permit.
Documents you may need
- Building permit application with plan review through the Centennial Self-Service (CSS) portalrequired
- PDF architectural, structural, and site plans (PDF is the only accepted format)required
- Project valuation based on labor and materialsrequired
- Licensed City of Centennial building contractor and any subcontractor list on fileLikely required
- Permit applicationrequired
- Construction drawings (floor plan, elevations, framing/structural)required
- Site plan with setbacks and lot coveragerequired
- Energy compliance and structural/engineering detailsSometimes required
Possible inspections
- Footing and foundation inspection
- Framing inspection
- Rough-in inspections for electrical, plumbing, and mechanical
- Insulation and final inspections (Certificate of Occupancy where required)
- Footing/foundation inspection
- Insulation inspection
- Final inspection
Frequently asked questions
- Do I need a permit for addition or structural alteration in Centennial?
- Yes. In Colorado, addition or structural alteration generally requires a permit, and Centennial is no exception. Additions and structural alterations in Centennial go through full plan review under the 2021 IBC/IRC with local amendments, and plans and payments run through the Centennial Self-Service (CSS) portal. Structural plans must reflect Centennial's amended design criteria of 30 psf non-reducible roof snow load and 115 mph wind speed (Sec. 18-2-30). Contractors and subcontractors must be licensed in the City of Centennial, and a homeowner may pull the permit only if doing the work themselves, occupying the residence, and filing the Homeowner Agreement. Adding to or structurally altering a home requires a building permit and full plan review in Colorado jurisdictions; the exact submittal list and adopted code edition are set locally because there is no statewide code. Electrical and plumbing portions of the work fall under Colorado's state Electrical and Plumbing Boards and require their own state permits and inspections in addition to the local building permit.
- Who issues the permit in Centennial?
- The local building department for Centennial handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.