Do I need a permit for an attached deck in
Kearns, Utah?

Kearns attached deck permits—the key details

Electrical and plumbing on your deck are separate permit items. If you plan to add a 240-volt outlet for a spa, a 110-volt outlet for lights, or a gas line for a grill, each requires its own electrical or plumbing permit and inspection by Kearns Building or Plumbing/Mechanical divisions. Deck lighting is relatively simple (low-voltage 12V or standard 120V circuits in weatherproof boxes on a dedicated 20A circuit), but buried or conduit-run wiring must meet NEC Article 680 (pools and spas) if the deck is adjacent to water features, or standard NEC Chapter 2 for general construction. Gas lines for outdoor grills require a licensed plumber and gas company sign-off. Most homeowners add these later, but if you're planning them, mention it on your permit application so the plan reviewer can flag any conflicts with footing or ledger placement. Composite decking (Trex, TimberTech, etc.) is code-compliant in Kearns and does not change permit requirements—lumber and composite are treated the same structurally. The frost-depth and seismic requirements remain identical.

Three Kearns deck (attached to house) scenarios

Frost depth, seismic bracing, and clay-soil concerns in Kearns

Kearns sits on Lake Bonneville sediments—clay and silt deposited during prehistoric Lake Bonneville's expansion and contraction. This clay is expansive, meaning it swells when wet and shrinks when dry, exerting pressure on foundations and creating heave in shallow footings. The Utah Geological Survey maps these zones, and much of Kearns falls in moderate to high expansive-clay areas. This is why frost-depth footing is so critical: if your footing is only 24 inches deep but your frost line is 36 inches, winter freezing will create ice lenses below the footing, lifting it 1-2 inches per year until your deck ledger tears away from the rim joist or your posts lean. Kearns Building Department inspectors will verify frost-depth compliance by checking the excavation before concrete pour. They'll measure the depth of your holes and cross-reference local frost-depth maps. If you're 6 inches shallow, the inspection fails and you must dig deeper and re-pour. Don't assume your neighbor's 30-inch footings are safe; their lot may be in a different micro-zone or they may have gotten away with shallow work in the past. The 30-48 inch range exists because elevation and soil type vary across Kearns—higher elevations (near the Wasatch Front foothills) are often at the 48-inch end, while lower areas can be 30-36 inches.

The Wasatch Fault runs north-south through Utah County and Salt Lake County, and Kearns is within the 'greatest hazard zone' per the Utah Seismic Safety Commission. The fault last ruptured about 1,400 years ago and is capable of a magnitude 7+ earthquake. Utah's seismic building code (adopted via amendments to the IBC) requires that deck ledgers include lateral-load devices to prevent decks from separating from houses during seismic events. A DTT (deck-to-ledger tension tie) connector is essentially a metal bracket bolted to the ledger board and the rim joist, rated for shear load (typically 2,000-3,000 pounds per manufacturer specs). Without it, during a seismic event, the deck could slide sideways relative to the house, creating a gap and exposing the ledger and rim joist. Kearns inspectors will ask to see the DTT on your plans and will verify it's installed during framing inspection. This is not optional; it's a line item on the inspection checklist. Many DIY builders and even some contractors from out of state don't know about this requirement and get flagged during plan review. If your plans arrive without DTT notation, Kearns will return them for revision (adding another week to review).

Clay-soil expansiveness also affects your footing concrete itself. Expansive clay below the footing can exert upward pressure (called 'swell' or 'heave'), pushing your concrete up over years. Some builders in high-expansive areas opt to drill deeper footings (60+ inches) or use structural-fill (compacted gravel) below the concrete to reduce clay contact. Kearns doesn't require this by default, but if your lot is flagged as high-expansivity, the building department may recommend it or require a geotechnical engineer's assessment ($800–$1,500). For most decks, the frost-depth footing is sufficient; but if you have visible signs of soil movement on your lot (cracked foundation, doors out of square, visible clay deposits), mention it to the building department during your initial inquiry. They can point you to soil-stability maps or recommend a Phase I soil assessment.

Plan review, inspection sequence, and permitting timeline in Kearns

Kearns Building Department does not offer over-the-counter deck approvals. All deck permits, even simple 10x12 ground-level ones, go through full plan review because of the frost-depth verification requirement. You'll submit your application and plans via the Kearns permit portal (or in person at City Hall if the portal is down). Plans should include a site plan (lot lines, deck location, distance from property lines), foundation plan (post locations, footing sizes and depths, concrete specs), framing plan (joist and beam sizes, spacing, ledger detail), and elevation drawing (deck height, stair dimensions, guardrail height). If your deck is attached or over 200 sq ft, the plan should also include structural calculations or span tables (e.g., 'per IRC Table R502.3.1, a 2x8 joist at 16-inch spacing spans 14 feet'). The city assigns a plan reviewer, who examines the plans against the current IBC (2018, with Utah amendments) and the Kearns municipal code. Plan review typically takes 2-3 weeks. If the plans are missing information (e.g., no DTT detail, footings shallower than frost line, no ledger flashing detail), the reviewer will issue a 'plan review comment report' listing deficiencies. You must submit revised plans addressing each comment. This cycle repeats until the plans are approved. Most decks pass second review; complex or non-standard designs might take three cycles. Once approved, the city issues a permit and inspection card with a job number.

Inspections follow a standard sequence: footing inspection (before concrete pour—verify hole depth, diameter, post placement), framing inspection (after posts, beams, ledger installed—verify connections, flashing, DTT hardware, guardrail framing), and final inspection (after deck surface installed—verify rail height, stair dimensions, ledger fully flashed, all fasteners visible and appropriate). Owner-builder permits allow you to perform some work yourself (post installation, deck surface framing), but Kearns requires that a licensed contractor supervise and sign off on footing excavation and concrete pour. This is because soil conditions and frost-depth verification are structural safety issues that require professional judgment. If you're building your own deck, you'll schedule the footing inspection by calling or logging into the portal. The city posts a notice on the property 24 hours prior. The inspector will measure the footing hole, verify it meets frost depth, ensure concrete specifications are correct (usually 3,000 psi minimum), and clear you to pour. After concrete cures (typically 7 days), you schedule framing inspection. The inspector verifies post and beam placement, ledger fastening, flashing installation, and DTT hardware (all items must be visible and match the approved plan). If anything is non-compliant, the inspector will issue a note and you must correct it before final inspection. Final inspection is scheduled after the deck is complete (surface boards installed, stairs in place, guardrail attached). Inspectors verify dimensions, fastener types, and that all previously noted items were corrected.

Total permitting timeline from application to final approval is typically 4-6 weeks for a straightforward deck: 2-3 weeks plan review, then footing inspection (1 week after approval to schedule), framing inspection (1-2 weeks after footing is cured), and final (1 week after framing complete). If you have revision comments, add another week or two. Owner-builder permits are processed the same way; the city doesn't charge a reduced fee for owner-builder work, but you save the contractor labor cost. Once final inspection is approved, Kearns issues a Certificate of Completion. This is essential: you'll need it for homeowners insurance, for selling the house, and for any future refinancing. Keep it with your home records. If you lose it, the city building department can issue a copy, but this takes another 1-2 weeks and might incur a research fee ($50–$100). The permit itself is non-transferable; if you sell the house before final inspection, the new owner can take over the permit if they're pulling an owner-builder permit for their own work, or they can hire a contractor to finish and pull a new permit. Either way, the original permit job number is tied to your property record.

Common questions