What happens if you skip the permit (and you needed one)
- Stop-work orders in Highland carry a $500 civil fine plus mandatory double-permit fees ($400–$900 total) when the city discovers unpermitted work via neighbor complaint or lender inspection.
- Structural failure liability: if a footing frost-heaves (Highland's 30-48 inch frost depth makes this common), and someone is injured, your homeowner's insurance will deny the claim citing unpermitted work — exposure is $100,000+.
- Title clearance and resale: Highland requires disclosure of all permitted work on property transfers; unpermitted decks trigger lender appraisal holds and can kill a sale at closing.
- Seismic retrofit costs: if the city forces removal or retrofit due to missing lateral load connectors, rebuilding to code runs $3,000–$8,000 depending on size, versus $300–$600 in connectors on the front end.
Highland attached deck permits — the key details
Highland's Building Department requires a permit for any deck attached to the house, with no square-footage exemption. This is stated clearly on the city's building permit checklist and in the municipal code adoption of the 2021 International Building Code. The moment the deck ledger bolts to your house rim joist, it's a structural load path that must be engineered and inspected. Ground-level freestanding decks under 200 sq ft and 30 inches tall can sometimes be built without permit in other Utah jurisdictions, but not in Highland — the distinction is irrelevant here because attachment to the house is the trigger. The city's online permit portal allows you to submit plans electronically, but you'll need a PDF floor plan (minimum 1/4-inch scale showing ledger location, joist spans, beam details) and a detail drawing of the ledger-to-rim-joist connection with flashing per IRC R507.9. Most homeowners hire a local engineer (cost: $300–$600) to stamp the plans; some builders use pre-engineered deck plans that Highland staff has already vetted. Plan review typically takes 2-3 weeks, and if the Building Department comes back with comments (common), you'll have 10 days to resubmit revised plans.
Highland's frost line sits at 30-48 inches below finished grade — deeper than much of Utah — because the city sits in IECC Climate Zone 5B in the lower valleys and 6B in the mountains around Blacksmith Fork Canyon. IRC R403.1 requires footings to extend below the local frost line, and Highland's soils engineers are strict about verification. You'll see this at the pre-pour footing inspection: the inspector will measure depth with a tape and confirm that post holes reach at least 36 inches (more commonly 42-48 inches for margin of safety). If you pour at 30 inches and the frost heaves your deck 1-2 inches per winter cycle, ledger separation and leaks follow within 2-3 years. The Lake Bonneville sediment clay adds another complication: these soils are prone to settlement under long-duration load, so the Building Department's geotechnical consultant (via the city engineer's office) sometimes requires bearing-capacity verification for decks over 300 sq ft. This isn't a separate fee — it's part of the standard plan review — but it does add 1-2 weeks to timeline if soil testing is ordered.
The Wasatch Fault seismic requirement is the single biggest surprise for builders accustomed to less stringent Utah codes. Highland enforces UBC seismic design via the 2021 IBC, which means any deck elevated more than 24 inches off grade must include lateral load tie-downs. This translates to Simpson DTT (deck tension ties) or equivalent on the ledger bolts, and post-to-beam moment connections (lag bolts or joist hangers rated for shear) per IRC R507.9.2. Cost is modest (DTT hangers are $30–$80 per corner, or $150–$300 for a 16×12 deck), but if you don't know to specify them on the plan, the Building Department will issue a correction notice and delay your footing inspection. Many owner-builders in Highland are surprised that their neighbor's deck 5 miles away in Saratoga Springs didn't need this — that town has a different seismic zoning policy — which can breed frustration. The city has a one-page seismic tie-down requirement sheet on its portal that you should download and read before drawing your plans.
Ledger flashing is the second-most common plan-review rejection in Highland. IRC R507.9 requires either a flashing-and-adhesive system or a flashing-and-caulk system between the deck ledger and the house rim joist, with the top of the flashing embedded under the house wrap or behind the house siding. Many owner-builders draw a simple lap-flashing detail that doesn't account for the slope of springtime snowmelt — Highland gets 40-60 inches of snow annually — and water finds its way behind the flashing within two seasons. The Building Department requires one of three approaches: (1) Schluter or similar metal flashing with integrated slope (cost $3–$5 per linear foot), (2) Henry or equivalent self-adhering flashing under siding removal and re-install (cost $500–$1,200 labor), or (3) pre-made ledger-flashing kits from Simpson or LUS that the inspector has pre-approved. When you submit your plan, include a 3-inch × 6-inch detail of the ledger-flashing assembly with dimensions and product names — that's the fastest path to approval.
Timeline and fees in Highland: the permit fee is calculated at roughly 1.5-2% of valuation, with a $200 minimum. A typical 16×12 deck (192 sq ft) at $60/sq ft materials and labor = $11,500 valuation, yielding a $230 permit fee. Add $100–$150 for plan review if the city requires an engineer stamp, and you're looking at $330–$380 total permit cost. Inspection fees (footing pre-pour, framing, final) are usually bundled into the permit fee, though some jurisdictions add $50–$100 per inspection; confirm with the Building Department when you pick up your permit. Timeline from submission to final certificate is typically 4-6 weeks if there are no plan corrections. If you're working with a contractor, they'll handle the permit; if you're owner-building, you can file online or in person at Highland City Hall (check hours and address on the city website). The Building Department staff are responsive and generally open to phone consultations before you finalize plans — calling ahead to confirm your approach (footings, flashing, seismic details) saves 1-2 weeks of back-and-forth.
Three Highland deck (attached to house) scenarios
Why Highland's frost line and seismic requirements are a bigger deal than you think
Highland sits at the edge of the Wasatch Front, where two geological realities collide: deep winter frost (30-48 inches in most of the city, 48-54 inches in the higher canyons) and active seismic faulting (Wasatch Fault runs north-south through the county, and the 2020 Magna 5.7 earthquake was a reminder that seismic risk is real). The frost depth requirement is enforced via IRC R403.1 and Utah Code Title 15A (which defaults to the IBC, which incorporates the IRC). Highland's Building Department has a frost-depth map that shows 36 inches minimum in the lower valleys and 42-48 inches in the foothills. This is not cosmetic: frost heave (vertical movement of soil due to ice lens expansion) is documented at 0.5-1.5 inches per winter cycle in post-failure case studies from this region. If your deck footings are at 30 inches (the frost line in warmer Utah counties like Washington or Juab), your posts will lift 0.5-2 inches per winter, causing the ledger to separate from the house rim joist by a quarter-inch per year. Over 5 years, you've got a 1-2 inch gap, water gets behind the flashing, the rim joist rots, and you're looking at $8,000–$15,000 in house damage repair.
The seismic tie-down requirement adds $150–$400 to a typical deck, but it's based on the 2020 Magna earthquake and older slip-trench paleoseismic evidence showing that Wasatch Fault ruptures occur roughly every 300-400 years, and the last major event was circa 1600 AD. That means the Wasatch Front is overdue. The 2021 IBC, which Highland adopted, incorporates seismic design categories based on USGS hazard data; Highland is in Seismic Design Category C or D (depending on location), which requires lateral load path design per IBC 1613 and 1614. For decks, this translates to moment connections at ledger bolts and posts, not simple shear connections. During an earthquake, lateral acceleration can briefly increase the horizontal load on a deck by 10-20% of the vertical load. A 300 lb person on a deck during a 0.5g acceleration event experiences a lateral jolt of 150 lb — if your ledger bolts are not designed for that moment load, the ledger can separate from the house, and the deck can tilt or collapse. The cost of a proper DTT (Deck Tension Tie) at each ledger corner is $30–$80 per tie, which is why the Building Department insists on it in the permit review. Many builders think this is overkill — and in non-seismic Utah counties, it would be — but in Highland, it's the code, and it's based on real risk.
The interaction between frost depth and seismic tie-down shows up in inspection. When the footing pre-pour inspector arrives, they're checking two things: (1) is the hole deep enough (42 inches in lower Highland, 48 inches in canyons), and (2) is the post positioned so that the moment connection detail (if required) will work after frost heave. If you're relying on lag bolts into a doubled rim joist to resist moment, and frost heave lifts your post by 1 inch relative to the house, the lag bolt angle changes and loses moment capacity. This is why the Building Department sometimes requires a supplemental moment plate (welded or bolted to the post and ledger) rather than lag bolts alone — the plate adds rigidity and accommodates small vertical movement. You won't see this detail in a deck built in Springville or Spanish Fork, and it adds $200–$300 in materials and labor. The payoff is a deck that survives both frost cycles and seismic events without separating from your house.
Highland Building Department's plan review process and how to avoid common rejections
Highland uses an online permit portal (managed by the city's website) where you submit your plans as PDF files. The portal is straightforward but has a few quirks that can delay your application. First, plans must be on 11×17 inch paper or smaller (the scanning system rejects larger sheets), so you'll need to fold or split your detail drawings. Second, the system requires a cover sheet listing your name, property address, project scope, and estimated valuation — many applicants leave the valuation blank or guess low, which triggers an automatic request for clarification (adds 3-5 days). Third, you should include a zoning map showing that your property is not in a Historic Preservation Overlay or Flood Hazard Zone; if it is, there are additional restrictions. Highland's historic overlay covers a small area along Main Street and Gentile Street (early twentieth-century homes), and decks in that zone require Architectural Review Board approval before city permit. The city's website has a zoning map tool; use it before you draw your plans.
The most common rejections from Highland's Building Department are: (1) missing ledger flashing detail or flashing detail that doesn't comply with IRC R507.9 (top of flashing must be under siding or house wrap, sloped to drain, with caulk backup), (2) footing depth shown above local frost line (easy fix — just deepen the drawing and resubmit), (3) missing seismic tie-down detail or not identifying DTT brand (the detail must say 'Simpson DTT or equivalent, per IRC R507.9.2'), (4) railing detail that shows balusters spaced more than 4 inches apart (easy to fix in drawing, but sometimes the city wants to see the actual baluster product spec), and (5) for decks over 300 sq ft, missing soils report or bearing capacity notation. If you're owner-building, the fastest path is to use one of the Building Department's pre-approved ledger flashing details and seismic tie-down details (available on the portal or by calling) and copy them directly into your plan. This shows the city that you've done your homework and often results in a 'approved as submitted' stamp within 10 business days.
Timeline expectations: if your plan is complete and has no comments, plan review takes 7-10 business days. If there are comments (and there usually are), the city sends you a request for revisions via email, you have 10 days to resubmit, and then plan review restarts. For most decks, this cycle repeats once, sometimes twice. Total time from submission to approval is 2-4 weeks. The Building Department does offer a 'pre-plan review' appointment (usually free or $25) where you can show your sketch to the plan reviewer and ask questions before you finalize drawings; this is highly recommended and saves weeks of back-and-forth. Call the Building Department directly and ask for the plan review coordinator; they'll schedule a 15-minute phone or in-person appointment. Bring your site plan, ledger location, and a rough footing detail, and ask: (1) is this lot in any overlay zones? (2) what frost depth should I show? (3) what flashing detail have you pre-approved? (4) is seismic tie-down required for this elevation? (5) what valuation should I declare? These five questions will frame your entire plan and de-risk the formal review.
Highland City Hall, 5400 West Main Street, Highland, UT 84003
Phone: (801) 772-3550 (main line; ask for Building Department) | https://www.highlandcity.org (look for 'Permits' or 'Building' tab; online submission portal available)
Monday – Friday, 8 AM – 5 PM (verify hours on city website before visiting)
Common questions
Do I need a permit for a ground-level deck that's not attached to my house?
No, provided it's under 200 sq ft and under 30 inches above grade. But the moment it attaches to your house with a ledger bolt, it requires a permit. Highland's code does not exempt any attached decks, regardless of size or height. If you build a freestanding deck next to your house without attachment, you might avoid a permit, but it cannot be closer than 10 feet to the house (setback rule) and cannot serve as a primary exit from the house (life safety). Most builders choose an attached deck because a freestanding deck requires twice the materials and labor.
What is the frost line in Highland, and why does it matter so much?
Highland's frost line is 30-48 inches below finished grade, depending on neighborhood and elevation (deeper in canyons, shallower in lower valleys). It matters because IRC R403.1 requires footings to extend below the frost line to avoid frost heave (upward movement of soil in winter due to ice expansion). If your footings are above the frost line, your deck will lift 0.5-2 inches per winter, separating the ledger from your house and allowing water to rot the rim joist. Highland's Building Department enforces this strictly; footing inspection includes measuring depth with a tape.
What is a DTT (deck tension tie) and why do I need it in Highland?
A DTT is a Simpson brand (or equivalent) metal connector that bolts the ledger to the rim joist and resists lateral (sideways) movement during an earthquake. The Wasatch Fault runs through Highland, and the 2021 IBC requires seismic tie-downs on elevated decks (over 24 inches high). A DTT is not a deck-building requirement in many Utah counties, but it is here. Cost is $30–$80 per corner (roughly $150–$300 for a typical deck). Without it, the Building Department will reject your plan.
How long does plan review take for a deck permit in Highland?
If your plan is complete and pre-approved details are used, 7-10 business days. If there are comments (common), you resubmit, and the cycle repeats, typically 1-2 times. Total time from submission to approval is 2-4 weeks. Larger decks over 300 sq ft or those in historic overlay zones may take 4-6 weeks. Call the Building Department before submitting to ask about pre-plan review, which can save 2-3 weeks.
Can I build a deck as an owner-builder, or do I need to hire a contractor?
Yes, Highland allows owner-builder permits for owner-occupied residential property. You must sign the permit application as the homeowner and do the work yourself (or hire help, but you're the responsible party). Plan review is the same; you still need a complete, engineer-stamped or approved plan. Most owner-builders hire a local engineer ($400–$600) to stamp the plans and avoid rejection. Inspections are mandatory, and the inspector will expect the work to match the approved plan exactly.
What is the permit fee for a typical deck in Highland, and are there other costs?
Permit fee is roughly 1.5-2% of valuation, with a $200 minimum. A typical 200 sq ft deck valued at $12,000 has a $240 permit fee. If you add electrical (GFCI outlet), there's a separate $50–$100 electrical permit. Plan review fees are bundled into the building permit. Inspection fees (footing, framing, final) are usually included, though some jurisdictions charge $25–$50 per inspection; ask when you pick up the permit. If you need an engineer stamp, that's $400–$600 outside the city fees.
My neighborhood has an HOA. Do I need HOA approval in addition to a city permit?
Yes, in many Highland neighborhoods. HOA approval is separate from city permit and is often more restrictive. Some HOAs prohibit decks over 8 feet wide, require cedar only, or specify railing style. You must get HOA approval before (or alongside) the city permit. This adds 2-4 weeks to timeline. Check your CC&Rs or contact your HOA board before you submit plans to the city. If the HOA denies your deck, the city permit is worthless.
Does my deck need to be inspected, and what happens if I fail inspection?
Yes. Highland requires three inspections: footing pre-pour (inspector measures depth and confirms frost line), framing (ledger bolts, flashing, seismic tie-downs, posts), and final (railing, stairs, any utilities). If you fail an inspection, the inspector issues a stop-work order, you correct the defect, and the inspector returns for a re-inspection (usually free, but some jurisdictions charge $25–$50 per re-inspection). Most decks pass on the first or second attempt if you follow the approved plan exactly. Deviations from the plan (e.g., different footing size, missing flashing) result in failure.
What flashing detail does Highland accept for the ledger-to-rim-joist connection?
Highland accepts three approaches: (1) Schluter A100 metal flashing with integral slope (easiest, ~$3–$5 per linear foot, no house wrap removal needed), (2) Henry Blueskin or equivalent self-adhering flashing installed during house wrap replacement (requires siding removal, ~$500–$1,200 labor), or (3) Simpson LUS or equivalent pre-made ledger flashing kit. Download the pre-approved flashing details from the Highland Building Department portal and include a 3×6 inch cross-section detail in your plan showing product name, slope, caulk backup, and penetration depth. This is the single fastest way to get approval.
What happens if I build a deck without a permit and it's discovered later?
If caught during sale appraisal or lender inspection, the lender will require a retroactive permit or removal before closing. If discovered via neighbor complaint, the city issues a stop-work order and civil fine ($500 in Highland). You'll be forced to pull a permit and correct any code violations (likely including deeper footings, added flashing, seismic ties), which costs 2-3 times as much as getting the permit upfront. If someone is injured on the unpermitted deck, your homeowner's insurance will likely deny the claim. Most importantly, a title clearance issue will follow the property; unpermitted work must be disclosed to future buyers, and it can kill a sale at closing.