Castle Rock enforces the 2024 IRC under Ordinance 2026-017, and you need a permit to replace a roof; shingle repairs of up to one square (100 square feet) per building are exempt. The town requires a 100% tear-off, has deleted the IRC roof recover section and requires an ice barrier.
General information, read from the official sources listed below on 2026-10-28. Codes and local policies change, so confirm the rules for your address with the building department before work starts.
Castle Rock roof code data table
| Item | Castle Rock |
|---|---|
| Adopted IRC edition | 2024 IRC with town amendments (Ordinance 2026-017). Source: Castle Rock Ordinance 2026-017 |
| Adopted IBC edition | 2024 IBC. Source: Castle Rock adopted building codes |
| Adoption or effective date | Ordinance 2026-017 passed on second reading June 2, 2026. Town amendments took effect June 30, 2026; the 2025 Colorado Wildfire Resiliency Code on July 1, 2026. Source: Castle Rock Ordinance 2026-017 |
| Roofing amendments and local policies | IRC R908.4 (roof recover) deleted. New R905.7.5.1: Class C and wood shingles installed per IBC Section 1505.7. Existing underlayment must come off to expose the deck. Permits expire with no inspection within 180 days of issue or the last approved inspection. Source: Castle Rock Ordinance 2026-017 |
| Ice barrier rule | Required (Table R301.2(1): Yes). Eaves and valleys, from the lowest edge to at least 24 in inside the exterior wall line; on slopes of 8:12 or steeper, at least 36 in along the slope. Detached accessory structures without conditioned space are exempt. Source: Castle Rock Ordinance 2026-017 |
| Ground snow load | Below 6,000 ft: 30 psf. 6,000 to 6,499 ft: 35 psf. 6,500 to 6,999 ft: 40 psf. Ground snow equals roof snow; no reductions. Source: Castle Rock Ordinance 2026-017 |
| Design wind speed | 115 mph Vult; exposure is site specific; special wind region and topographic effects: no. Source: Castle Rock Ordinance 2026-017 |
| Reroof permit trigger | A building permit is required to replace a roof. Exempt: shingle repair or replacement not exceeding one square (100 sq ft) of covering per building (new R105.2 item 11). Source: Castle Rock Ordinance 2026-017 |
| Layers allowed | One. 100% tear-off; overlays not permitted. Source: Castle Rock Re-Roof Checklist |
| Wildfire / WUI code status | From June 30, 2026, reroof permits may be subject to the Colorado Wildfire Resiliency Code, depending on the property hazard classification. Source: Castle Rock Re-Roof Checklist |
| Inspection requirements | Mid-roof once the roof is 100% dried in with at least five rows installed, up to 50%; the roof cannot be finished until it passes. Missed mid-roof: uncover 10% on each side (an $85 reinspection fee may apply) or submit an alternative method request with a stamped engineer or architect letter. Source: Castle Rock building FAQs |
| Permitting office | Castle Rock Building Division: 720-733-3527; inspection line 303-660-1341. Source: Castle Rock Re-Roof Checklist |
What it means for a homeowner reroofing in Castle Rock
Castle Rock removed the recover option from its code entirely, so no product or manufacturer instruction can make a layover legal. The old underlayment has to come off too, which lets the inspector see the deck.
Snow load climbs with elevation in three steps: 30, 35 and 40 psf, with no reduction allowed. That matters for heavier roofing such as tile or stone-coated steel on battens, where the framing has to carry the added weight.
Steep roofs get more ice barrier. At 8:12 and steeper, the membrane must reach at least 36 inches up the slope from the eave, beyond the usual 24 inches inside the wall line. Note that the town FAQ page still cites the 2018 IRC for wind and ice; the ordinance is the current text.
Common inspection failures in Castle Rock
These are items the building department's own code or handouts say it checks or rejects. No public data ranks how often each one fails, so the order means nothing.
- Old underlayment left on the deck.
- Roof closed up before the mid-roof inspection passed.
- Ice barrier short of 36 in up the slope on an 8:12 or steeper roof.
- No ladder staged to OSHA standards for the inspector.
- Permit left without an inspection for 180 days and expired.
Steps to permit a reroof in Castle Rock
- Confirm the address elevation band for snow load and the wildfire map class.
- Pull the permit; repairs of one square or less per building are exempt.
- Tear off to the deck, including underlayment.
- Schedule the mid-roof once dried in with at least five rows, before 50%.
- Schedule the final through eTRAKiT or the inspection line.
Related pages
- Castle Rock roofing
- Castle Rock re-roof rules explained
- Colorado Wildfire Resiliency Code on a reroof
- Roof replacement
- Roof repair
- Hail damage repair
- Free roof inspection
- Compare roof codes by jurisdiction
Hail history by ZIP in Castle Rock: 80104 (Castle Rock)
Sources
- Castle Rock Ordinance 2026-017
- Castle Rock adopted building codes
- Castle Rock Re-Roof Checklist
- Castle Rock building FAQs
Compiled by Integrity Roofing and Painting, roofing Colorado homes since 1990 (36 years in business). We are an Owens Corning Platinum Preferred contractor with 650+ Google reviews, and our repair scopes follow the local code and the manufacturer's installation and warranty requirements. We do not issue permits or rule on code; the building department does.
