A Denver roof needs replacing when it is at the end of its life (most asphalt roofs here are 20 to 25 years old by then), when leaks keep returning in different places, or when hail or wind damage is spread across several slopes. The replacement itself is usually a one- or two-day job: tear-off to the deck, repairs to the decking, new underlayment and flashing, new roofing, cleanup, and a final city inspection. What varies most is the paperwork, because every city around Denver has its own rules for permits, layers and inspections.
Signs it is time
- Age. Asphalt shingle roofs in Denver commonly reach 20 to 25 years before replacement. Tile, slate and metal last much longer. Our article on when an asphalt roof needs replacement has the details.
- Granules in the gutters, curling or cracked shingles. The shingles are wearing out from the top down.
- Leaks that move. One leak is a repair. A new leak every season is a roof that is failing.
- Soft spots or sagging. That points to wet or damaged decking.
- Storm damage across several slopes. See Denver storm damage repair; the claim stays yours, and our photos make sure nothing gets missed in the scope.
If only one area is bad, start with Denver roof repair instead.
Tear-off rules around the metro
| Where | Can you overlay? | Notes |
|---|---|---|
| Denver | One re-cover over a single layer | Two or more layers must come off. Decking gaps over 1/2 inch must be closed. |
| Littleton | No | Full tear-off to the deck on every roof. |
| Lakewood | No | Residential roofs are removed to the deck; spaced boards must be overlaid with panel sheathing. |
| Centennial | No | All existing layers are removed to the deck. |
| Castle Rock | No | 100% tear-off, including the old underlayment. |
| Unincorporated Adams County | No | One layer of roofing maximum. |
Even where an overlay is allowed, a full tear-off is the only way to see and fix the decking.
Denver-specific steps on a replacement
- Permit before work. Every Denver replacement needs a permit.
- Insulation check. If the roof has no insulation in the cavity and the sheathing is exposed during the re-roof, Denver’s energy code requires adding it, either above the sheathing (R-30ci) or below it (R-38 for flat roofs, R-49 for attics).
- Ventilation. Denver does not inspect venting on re-roofs, but manufacturer warranties often require proper ventilation, so it is worth checking during the inspection.
- Asbestos. Older roofing may need a certified asbestos inspection under CDPHE rules before tear-off.
- Final inspection. One- and two-family asphalt roofs get a final inspection; townhomes also get a pre-inspection.
Choosing the new roof? Our Denver residential roofing guide compares materials and wind ratings.
Cost and financing
See how much a roof replacement costs in Denver. Financing is available, and many storm-damaged roofs are replaced through homeowners insurance.
We are veteran-owned, family-run since 1990, an Owens Corning Platinum Preferred contractor, and have 650+ Google reviews. Call our Centennial office at (303) 209-0152 or book a free Denver roof inspection. If the roof does not need replacing yet, we will tell you.
Sources: City and County of Denver, Roofing Guide and Checklist (updated 4/11/2024); City of Littleton, Policy 24-001; City of Lakewood, Roofing and Re-roofing handout; City of Centennial; Town of Castle Rock, Re-Roof Checklist; Adams County, Residential Roofing Requirements (July 2026).
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