What happens if you skip the permit (and you needed one)
- Stop-work order and $300–$500 fine if a neighbor reports unpermitted construction; lender or title company may refuse to close on the property until permit is obtained retroactively.
- Home insurance denial if deck collapses due to non-code footing or ledger flashing, leaving you liable for injury damages ($50,000+).
- Forced removal and reconstruction to code at your expense (estimated $3,000–$8,000) if the city inspector discovers non-compliant attachment during a later electrical or plumbing permit.
- Disclosure hit on future property sale: buyers' inspectors will flag unpermitted deck, triggering appraisal penalty (5–10% price reduction) and lender refusal.
Siloam Springs attached deck permits — the key details
Siloam Springs requires a building permit for any deck attached to the house, per the city's adoption of the 2012 IBC with Arkansas amendments. The distinction between 'attached' and 'freestanding' is the critical pivot: if your deck ledger bolts to the house rim joist or band board, it needs a permit. If you build a 16x12 freestanding deck sitting on isolated footings 4 feet away from the house, Siloam Springs' code allows it without a permit as long as it stays under 30 inches above grade and 200 square feet — but the moment you add a connecting beam or ledger, you cross the line. The city's Building Department does not offer a counter-service fast-track for small decks; all attached decks follow the same review path: submit plans (pen-and-paper or PDF), wait 7–10 days for review, get conditional approval (usually with notes on ledger detail), and schedule three inspections (footing/framing, framing final, electrical if applicable). There is no administrative exemption even for decks under 100 square feet.
Ledger flashing is the single most common reason Siloam Springs' inspectors reject or fail deck plans. The city enforces IRC R507.9 strictly: your ledger must sit on a continuous flashing membrane that extends above the siding and wraps under the house's weather barrier, with Z-flashing or equivalent metal flashing protecting the band board. Many homeowners and contractors assume tar paper or caulk alone will work; it won't. The inspector will ask for a detail drawing showing the flashing sequence — top edge under shingles or trim, vertical leg between ledger and rim, bottom edge extending at least 2 inches below the band board with a drip-edge lip. Siloam Springs' Building Department has posted a one-page ledger-flashing checklist on the city website (or will email it on request); use it. Aluminum Z-flashing (~$0.30/foot) plus a $200–$300 rework if you install it wrong is cheaper than a failed footing inspection or a rotted rim joist in three years.
Footing depth and frost line are geography-dependent within Siloam Springs city limits. The northern and western neighborhoods (Ozark foothills) typically have rocky, draining soil and a frost line at 6 inches; the eastern flatlands (Mississippi alluvium) may reach 8–12 inches depending on seasonal water table. Siloam Springs Building Department's standard requirement is 8-inch footings minimum, but if your soil is known to freeze deeper, you must go deeper or the inspector will fail you. If you're unsure, a soil probe ($0–$50 for a hand auger, or $300–$500 for a professional soil report) is cheap insurance. Posts should be set on concrete footings below frost line, with the concrete pad at least 12 inches above grade (to keep posts dry and prevent wood rot). Pier-and-beam (post-on-pad) is standard; helical footings are not required unless soil is unstable or site is a known flood hazard. Most decks in Siloam Springs use pre-cast concrete footings (Home Depot piers, ~$15 each) or on-site pour; either works if the hole is deep enough.
Stairs and landing dimensions are regulated under IRC R311.7. If your deck is more than 30 inches above grade, you must have stairs. Each stair tread must be 10–11 inches deep (nose-to-nose), rise must be 7–8 inches (heel-to-heel), and the top landing of the stairs must be at least 36 inches wide — standard for a single-width staircase. A landing that's only 32 inches wide will fail inspection. Guardrails must be 36 inches high (measured from the deck surface to the top of the rail) and spaced so a 4-inch sphere cannot pass through any gap (balusters ~4 inches apart). Siloam Springs does not enforce a 42-inch rail height as some hurricane-prone cities do; 36 inches is code. String connections, lag bolts, and post-to-beam attachment must be detailed on your plan — standard DTT (deck tie-tie) or lateral load clips per IRC R507.9.2 are the norm. If stairs connect the deck, they are part of the permit and must be detailed as well.
Electrical and plumbing on decks trigger additional submittals and fees. If you're adding a 120V outlet or lighting to the deck, the electrician must pull a separate electrical permit (typically $75–$150 in Siloam Springs); if you're adding a gas line or water line, plumbing and/or mechanical permits apply. These are separate from the deck structural permit and are sometimes reviewed by different departments (Electrical Inspector, Plumbing Inspector). Plan ahead: if you want deck lighting or a hot-tub water line, request 'rough-in' inspection timing so electrical and plumbing happen before you seal the deck framing. A typical deck permit for a 12x16 attached deck with stairs (no electrical) runs $200–$350; add ~$75–$150 if you include lighting circuits. Siloam Springs does not charge a 'project valuation' fee for decks under 200 sq ft; they use a fixed-scope permit fee instead.
Three Siloam Springs deck (attached to house) scenarios
Siloam Springs frost depth and footing requirements — why local soil matters
Siloam Springs sits at the boundary of three soil provinces: the flat, soggy Mississippi alluvial plain to the east; the rocky, well-drained Ozark plateau to the north and west; and a transition zone in the middle. The city's frost line varies from 6 inches in the northern hills (where bedrock is close and drainage is excellent) to 8–12 inches in the eastern flatlands (where clay and silt hold moisture longer and frost penetrates deeper). Siloam Springs' Building Department uses an 8-inch minimum footing depth as the default, but your lot may differ. If you're building in a wet area or near a drainage swale, or if you have heavy clay soil, you should dig deeper or order a soil probe.
A soil probe costs $0 to $50 if you do it yourself (hand auger from a rental shop) or $300–$500 if you hire a soil engineer. For a deck, the hand-auger method is usually fine: dig a hole 12 inches deep on your lot, watch for the water table and soil color changes, and ask your neighbor or the Building Department 'where does frost typically reach here?' If you find a water table at 8 inches, footings need to be below that and below frost — potentially 12–14 inches. Siloam Springs' Inspector will ask to see the footing detail on your plan; if you show 8 inches and the soil is clearly wet, they will ask you to go deeper. A 4-inch mistake costs you an extra $200–$500 in concrete and a failed inspection; a soil probe upfront prevents that.
Post-installation, inspect your footings every 3–5 years (especially if you have a wet site). Frost heave can push isolated footings upward over time, and wood-rot can weaken posts at the soil line. Siloam Springs' winter climate is mild (rarely below 0°F), so frost heave is less violent than in Minnesota, but it still happens in wet years. Keep gutters clean and ensure deck-area drainage slopes away from posts to minimize water pooling.
Ledger flashing in Siloam Springs — the most failed detail and how to get it right
Siloam Springs' Building Department has seen ledger failures because contractors or DIYers install the ledger directly on the band board with only caulk or tar paper, and within 2–3 years, water seeps behind the ledger, rots the rim joist, and the deck pulls away from the house (or collapses). The 2012 IBC / IRC R507.9 requires a continuous flashing membrane. Siloam Springs' Inspector will ask for a detail drawing showing the flashing. The detail should show (1) the ledger board, (2) metal Z-flashing or equivalent (aluminum is standard, ~$0.30/foot), (3) the flashing top edge under the house siding or trim, (4) the flashing vertical leg between ledger and rim, and (5) the flashing bottom edge extending at least 2 inches below the band board with a drip-edge lip pointing downward. No tar paper alone. No caulk as the primary water barrier.
Order your Z-flashing by the linear foot: a 12-foot ledger needs 12 linear feet of flashing (~$4). Installation is straightforward: slip the top edge under the siding (or behind the house wrap if siding is vinyl or composite), nail the top edge every 16 inches, position the vertical leg tight against the rim joist, and nail the bottom edge to the band board every 16 inches. Use stainless-steel fasteners (not galvanized, which corrodes) so rust doesn't stain the siding. If your house has brick veneer, the flashing detail is trickier — you may need to remove a course of brick and tuck the flashing behind, or use a site-built metal channel. Ask your Siloam Springs Inspector or a detail-conscious contractor for advice before you start.
Ledger bolts must also be detailed. IRC R507.9 requires bolts (or approved fasteners) every 16 inches along the ledger, minimum 1/2-inch diameter. Simpson Strong-Tie HUS210 or HUS310 (two-piece connectors) are the modern standard and are what Siloam Springs' inspectors expect to see on deck plans. Older tap-bolt-only details are approved but less common. If your plan shows ledger bolts, the Inspector will spot-check 2–3 bolts during the framing inspection to confirm they're the right size and torqued correctly. Don't skip this detail or assume caulk is enough.
Siloam Springs City Hall, Siloam Springs, AR (exact address: contact city or search 'Siloam Springs Building Department')
Phone: (479) 524-6330 or (479) 524-3131 (City Hall main line — ask for Building Department) | https://www.siloamsprings.com (city website; check for online permit portal or submit in person)
Monday–Friday, 8:00 AM – 5:00 PM (verify locally; may vary)
Common questions
Is a freestanding deck exempt from permit in Siloam Springs?
Yes, if it's under 30 inches above grade AND under 200 square feet AND has no attachment to the house. The moment you bolt a ledger to the rim joist, it becomes 'attached' and requires a permit, regardless of size. Freestanding decks must still be set on footings below the 8-inch frost line (or deeper in wet soil), but you don't need city approval if you meet the size and height exemptions. If unsure whether your design qualifies, ask Siloam Springs' Building Department before you build.
How much does a deck permit cost in Siloam Springs?
A typical attached deck permit (no electrical) is $250–$350. If you add electrical (lighting, outlet), add $100–$150 for an electrical permit. If you add plumbing (hot tub, water line), add $100–$150. Siloam Springs does not charge by project valuation for decks; they use a fixed permit fee. A 12x16 deck with stairs costs the same permit fee as an 8x10 deck.
Do I need a professional engineer or architect for my deck plan?
No, not for a typical single-family residential deck under 200 sq ft and 12 feet high. Siloam Springs allows 'pen-and-paper' or CAD plans submitted by the homeowner or contractor, as long as the plan includes the required details (site plan, framing plan, ledger detail, footing detail, stair/ramp detail). If your deck is unusually large (over 200 sq ft), unusually high (over 12 feet), or in a flood zone, the city may require an engineer's stamp — ask before you submit.
Can I build my own deck in Siloam Springs, or do I need a licensed contractor?
Owner-builders are allowed in Siloam Springs for owner-occupied homes. You can pull the permit in your name and do the work yourself, or you can hire a contractor and have them pull the permit in their name. Either way, the permit is required, and all inspections must happen. If you're an owner-builder, you still need to understand the code requirements (ledger flashing, footing depth, guardrail height, etc.) or hire someone who does.
What if my deck site is in a flood zone? Does that change the permit?
Yes. If your lot is in FEMA flood Zone AE (near Beaver Lake or a creek), Siloam Springs' Floodplain Administrator must review and approve deck footings and elevation. You may need an elevation certificate ($300–$500) and may be required to set footings below the base flood elevation (BFE). This adds 1–2 weeks to the permitting timeline and possibly requires deeper footings or even deck relocation. Check your FEMA map online (search 'FEMA Flood Map Siloam Springs') before you design the deck.
How long does it take to get a deck permit approved in Siloam Springs?
Plan review typically takes 7–10 business days from submission. If your plan is incomplete or non-compliant (e.g., ledger flashing missing), the city will return it with comments, and you'll resubmit a corrected plan (add 3–5 more days). Once approved, scheduling inspections can add another 1–2 weeks depending on inspector availability. Total timeline: 3–4 weeks from submission to final approval. Flood-zone permits may take 4–6 weeks due to floodplain review.
Can I add a hot tub to my deck without a separate permit?
No. A hot tub requires a plumbing permit (water supply and drain line) and usually an electrical permit (240V circuit, GFCI protection). These are separate from the deck structural permit. Siloam Springs charges $100–$150 for a plumbing permit and $100–$150 for an electrical permit. You must coordinate timing: rough-in inspections for plumbing and electrical happen before you close in the deck framing.
What inspections are required for a deck permit in Siloam Springs?
Standard deck inspections are (1) footing/excavation (before concrete pour), (2) framing (after posts, ledger, and joists are installed but before decking), and (3) final (after all work is complete). If you have electrical, add an electrical rough-in inspection. If you have plumbing, add a plumbing rough-in inspection. Schedule inspections by calling the Building Department; most are available within 2–3 business days of request.
If my neighbor complains about my unpermitted deck, what happens?
Siloam Springs' Building Department will issue a stop-work order and fine you $300–$500. You'll be required to either remove the deck or retroactively permit and reinspect it. Retroactive permitting can cost $500–$1,500 in additional fees and may fail inspection if the deck was built non-code. It's faster and cheaper to get the permit before you build.
Will my homeowner's insurance cover damage if the deck wasn't permitted?
Unlikely. If the deck collapses or causes injury and your insurer discovers it was built without a permit, they may deny the claim entirely. If someone is injured on an unpermitted deck, you could be personally liable for medical costs and damages ($50,000+). Permits protect you — get one.