Do you need a permit to replace a roof in Centennial, CO?

City of Centennial, Colorado

city

Centennial, CO

Required

Required

Because general, mechanical, and roofing contractors are not licensed by the State of Colorado, the City of Centennial Building Division requires its contractors to be licensed through the city before doing any work within its boundaries.

International Residential Code and International Building Code with City of Centennial amendments; verify the current adopted edition with the city.

Required About drip edge

Required — "Ice barrier underlayment water shield is a requirement on all roofs" - stated as a blanket requirement in the city's Residential Roof Repairs and Re-Roofing policy, not limited to eaves only. About ice & water barrier

Required — Required for all reroof permits. Scheduled once complete tear-off and underlayment are finished and new roof material is 25%-75% installed. Mid-roof and final inspections may alternatively be completed via photo inspection under the city's Photo Submission Waiver option.

Not required — The City of Centennial's currently-operative building-code adopting ordinance (Ordinance No. 2023-O-06, 2023, amending Chapter 18 of the Centennial Municipal Code) was reviewed in full, including the complete IBC and IRC amendment lists, and contains no impact-resistance, Class 4, or UL 2218 roofing requirement. The City's own residential re-roofing guidance likewise imposes only standard IRC Chapter 9 / R908 compliance and an ice-barrier requirement. Centennial's Class A roofing requirement under the Colorado Wildfire Resiliency Code rates fire resistance (ASTM E108/UL 790), not impact resistance.

Roof repairs under 100 square feet are a "small repair" and do not require a permit; if the total repair amount on any roof, or combination of slopes, exceeds 100 square feet, it is a "major repair" and a permit is required. Repairs exceeding 25% of total roof area require a complete tear-off and reroof.

IRC Table R301.2(1), as filled in (Centennial Municipal Code Sec. 18-2-30): 30 psf ground snow load; wind design speed "115 mph"; Topographic Effects "NO"; Special wind region "NO"; Windborne debris zone "NO"; ice barrier underlayment required "YES."

"Roof replacement shall include the removal of all existing layers of roof coverings to the deck." Existing-roof repair/replacement work "shall meet the requirements of chapter 9 section R908 of the 2021 International Residential Code." Materials removed from one roof cannot be reused on any other roof ("harvested material shall be considered used material and are not allowed"). (City of Centennial, Residential Roof Repairs and Re-Roofing policy page.)

"Skip decking is allowed where the gaps between boards does not exceed ½”." (City of Centennial, Residential Roof Repairs and Re-Roofing policy page.)

6.75% combined, the lowest of the Denver-metro cities in this corpus, and the City publishes its components: City of Centennial 2.5%, Colorado state 2.9%, RTD 1.0%, Scientific and Cultural Facilities District 0.1% and Arapahoe County 0.25%. As a home rule city Centennial administers and collects its own sales tax; the state, RTD, CD and county lines are collected by and remitted to the Colorado Department of Revenue. FOR A ROOFING JOB THE OPERATIVE TAX IS THE BUILDING MATERIALS USE TAX, WHICH IS CHARGED AT A DIFFERENT RATE FROM THE COMBINED SALES RATE ABOVE. The City states that all projects in which building and construction materials are used are subject to the City's use tax of 2.5 percent AND the Arapahoe County use tax of 0.25 percent, that the general contractor or property owner is responsible for paying it, and that it reaches all materials on the project including those used by subcontractors or furnished by the property owner, whether bought inside or outside the City. The mechanics a roofer needs: the use tax is a DEPOSIT paid before the building permit issues, computed on the City's estimate that 50 percent of the valuation is materials. Once it is paid, purchases by the general contractor or any subcontractor or material supplier should not include city and county sales tax, and the contractor must present a copy of the City building permit showing the amount of use tax paid in order to avoid municipal sales tax at the counter. The deposit is expressly an estimate and prepayment rather than a settlement: the actual cost of materials is the proper basis, additional use tax may be due, reconciliation is due within 90 calendar days of the later of the certificate of occupancy or the date of final inspection, and the City may audit actual material costs at any time within 36 months of that date. A roofer should therefore keep the final invoice including change orders, the job cost report, invoices showing Centennial sales tax paid, and a subcontractor list, which are the records the City names as those it may request.