What happens if you skip the permit (and you needed one)
- Stop-work order and $500–$1,500 fine from the City of Washington Building Department; you'll also owe double permit fees when you finally file.
- Insurance claim denial: if a guest is injured on an unpermitted deck and claims go to your homeowner's policy, the insurer can refuse to pay based on 'unpermitted alterations'—settlements can exceed $50,000.
- Resale disclosure hit: Utah law requires sellers to disclose all unpermitted work; buyers can sue for rescission or damages after closing, or your realtor can back out of the listing.
- Refinance/appraisal block: lenders often require a Certificate of Occupancy for any new structure; without a permit, the appraisal will flag the deck as 'non-permitted addition' and kill loan approval.
Washington, Utah attached deck permits—the key details
Washington's Building Department interprets 'attached' broadly: if your deck's ledger board is fastened to your house's band board, rim joist, or foundation, it's attached and requires a permit. The city enforces IRC R507.9 (ledger flashing), which mandates that your ledger be bolted to the band board with 1/2-inch bolts on 16-inch centers, a moisture barrier (Bituthene, ice-and-water shield, or equivalent) between ledger and house, and a drip cap or flashing that extends 2 inches past the ledger face and laps over the house's exterior. This detail alone fails many unpermitted decks because homeowners often skip the flashing or use caulk instead of metal flashing. Washington's frost depth ranges from 30 inches in the lower valley (Red Hills area) to 48 inches in higher zones (Washington Fields, near Hurricane). Your footings must extend below the frost line and rest on compacted soil or gravel—a 2-foot post hole won't pass. The city's soils are Lake Bonneville sediments (silt and clay with high expansion potential), so the building official may require you to test the bearing capacity of your soil or provide a footing design from an engineer if you're building on expansive clay. IRC R507 requires deck posts to be either pressure-treated wood (UC-4B rating or better for ground contact), composite, or a concrete pier with a wood post on top; the connection between post and beam must transfer both vertical load and lateral (seismic) load using metal hardware—typically a post base (Simpson LUS210 or equivalent) and hurricane ties or lateral connectors specified by an engineer.
Contact city hall, Washington, UT
Phone: Search 'Washington UT building permit phone' to confirm
Typical: Mon-Fri 8 AM - 5 PM (verify locally)