What happens if you skip the permit (and you needed one)
- Stop-work orders are issued by Rexburg Building Department when unpermitted decks are discovered (often during neighbor complaints or home sale inspections); the city can assess $250–$750 in cease-and-desist fines plus require full engineering review and possible deck removal if it fails retroactive inspection.
- Insurance denial: most homeowners insurance policies in Rexburg exclude liability coverage for unpermitted structural work; if someone is injured on your deck, your claim is often denied, leaving you personally liable for $50,000+ in medical costs.
- Refinance or sale blocking: Rexburg title companies and lenders require proof of permit or a certified engineer's letter stating the deck is code-compliant before closing; unpermitted decks can add $5,000–$15,000 in remediation costs or kill a sale outright.
- Footing failure in frost heave: if your deck footings are shallower than Rexburg's 36-42 inch frost line and they frost-heave, the deck can shift or collapse; repair costs run $8,000–$25,000, and unpermitted work voids homeowners insurance.
Rexburg attached deck permits — the key details
Rexburg Building Department enforces the 2020 International Residential Code (IRC), with local amendments that emphasize frost depth and soil conditions. IRC R507 governs all residential decks and requires every attached deck to have a ledger board bolted to the house rim joist with bolts spaced 16 inches on center, rated for lateral load (Simpson LUS210 or equivalent). The ledger must be protected with metal flashing that slopes away from the house per IRC R507.9, and that flashing detail is the single most common reason decks fail first inspection in Rexburg. Footings must rest below the maximum frost line in your area — in Rexburg that is typically 36-42 inches depending on the exact soil type and neighborhood (City Hall can confirm for your specific address). Posts must be 6x6 minimum (or two 2x6s sistered) for spans over 8 feet, and beam-to-post connections must use approved hardware (Simpson U210 straps or equivalent bolted connections, not nails or screws). Guardrails are required if the deck is over 30 inches above adjacent grade and must be 36 inches high (measured from the deck surface to the top rail), with balusters spaced no more than 4 inches apart to prevent a sphere test failure. Stairs must have treads of 10-11 inches, risers of 7-7.75 inches, and at least one handrail if there are four or more steps; landing depth under the stairs must be at least 36 inches.
Rexburg's specific challenge is the Palouse loess and Snake River Plain volcanic soils, which are prone to frost heave and, in some neighborhoods, expansive clay. This is why the city requires footing depth certification; a standard backhoe excavation to 42 inches must be photographed and inspected by the Building Department before concrete pour. If your deck is on a corner lot or near the Rexburg airport (noise overlay), or if it's in a historic district (downtown core), additional reviews or deed restrictions may apply. The Building Department's online portal (accessible via the city website under 'Permits') allows you to upload plans digitally, but you must create a municipal account first. Attached decks do not require a survey unless the deck encroaches within 5 feet of a side or rear property line; if you're near a line, a surveyor ($300–$600) can clarify and is cheaper than a rejected permit. Owner-builders are allowed in Rexburg for owner-occupied single-family dwellings, so you may pull the permit yourself and do the work, but you must still submit sealed plans for decks over 120 square feet.
Plan preparation and submission: if your deck is under 120 square feet and under 30 inches high, you can sometimes use the City's prescriptive plan sheet (available from the Building Department) and avoid a stamp. For anything larger or higher, you need a designer or engineer to produce a sealed plan showing footing depth, ledger detail with flashing, post sizing, beam sizing, railing detail, and stair detail. Rexburg Building Department recommends submitting one copy printed and one digital PDF via the portal. Review turnaround is typically 2-3 weeks; the Department emails you a 'Plan Review Comments' sheet listing required changes or approvals. Once approved, you receive a permit letter and a job card; this is your authorization to begin work. You then schedule a footing pre-pour inspection (required before concrete), a framing inspection (after posts, beams, and ledger are set), and a final inspection (after stairs, railing, and flashing are complete). Each inspection costs $50–$75 and is bundled into your permit fee.
Fees and timelines: Rexburg permit fees for attached decks are based on estimated project valuation (material + labor). A typical 16x12 deck (192 sq ft) with stairs and railing costs about $8,000–$12,000 to build; the permit fee is roughly 2.5-3% of valuation, so $200–$360. A larger 20x16 deck (320 sq ft) with electrical run-in for a hot tub or outdoor kitchen may trigger a $400–$500 permit. Fees are non-refundable once the permit is issued. Plan review, inspections, and final approval typically take 3-4 weeks from submission if you provide complete and compliant plans on the first round. If the Building Department finds deficiencies, you revise and resubmit, which adds another 1-2 weeks. Electrical work (outlet on the deck, hot tub wiring) requires a separate electrical permit and a licensed electrician; plumbing for an outdoor sink or spa also requires separate MEP permits and inspections.
Post-approval: once your final inspection is signed off, the Building Department issues a Certificate of Occupancy or 'Work Completed' letter. Keep this with your house records — you'll need it for refinance, resale, or insurance claims. If you're financing the deck with a home-equity loan or HELOC, your lender may require proof of permit and final inspection before disbursement. Rexburg's Building Department also flags unpermitted structures during code-enforcement sweeps (especially in spring when decks are visible), so a permitted deck protects you from neighbor complaints or municipal enforcement actions. If you ever plan to sell, the final permit letter becomes part of your disclosure package and actually adds confidence to a buyer.
Three Rexburg deck (attached to house) scenarios
Frost depth and footing failure: why Rexburg's 36-42 inch requirement matters
Rexburg sits in the heart of the Palouse loess region and the Snake River Plain volcanic zone, both of which experience severe winter frost heave. Frost heave occurs when water in the soil freezes, expands, and lifts structures built on shallow footings. Rexburg's frost line reaches 36-42 inches in most neighborhoods; this means that soil freezes solid to that depth every winter. If your deck footings rest above that line (say, only 24 inches deep), the frozen soil will push upward on your posts by 2-4 inches each winter, and thaw settlement will drop them back down in spring. Over 3-5 years, this cycle causes the deck to rack (twist), the ledger to separate from the house, and guardrails to fail.
The Rexburg Building Department requires footing depth certification because of this local hazard. Before you pour concrete, the inspector visits the excavation, measures the hole depth, photographs it, and confirms the bottom is at or below frost depth. Some inspectors also require a soil observation to rule out expansive clay or other problem soils; if expansive clay is found, a geotechnical report may be needed. This is not bureaucratic theater — it is the difference between a 20-year deck and a failed deck in year five.
If your lot is in a flood zone (Rexburg has some FEMA zones near the Teton River and creeks), frost depth may be deeper (up to 48 inches) because colder soil near water bodies freezes further. The city's flood map is available at the Building Department or online via the FEMA Flood Map Service Center. If you're unsure of your frost depth, call the Building Department and provide your address; they can confirm the requirement for your specific neighborhood.
Ledger flashing and attachment: the number-one Rexburg deck failure
IRC R507.9 requires the ledger board (the beam that attaches your deck to your house) to be bolted to the house's rim joist (the outer beam that sits atop your foundation) and protected with flashing. The flashing is a metal Z-channel or L-channel that sits behind the rim board's exterior sheathing and slopes downward and outward away from the house. The purpose is to shed water away from the rim board and house rim, preventing rot, ice dams, and water intrusion into your house rim and foundation. Rexburg's cold-wet climate (snowmelt and rain) makes this detail critical; rim boards and rims are the weak point for water damage.
Common Rexburg rejections: flashing missing entirely (rim-flash bolted directly to siding); flashing installed upside-down or sloped inward (water runs into the rim); flashing not extended far enough down the rim; flashing not sealed with sealant at the ledger-to-flashing joint; bolts corroded or undersized; bolts spaced more than 16 inches on center (should be 16 inches or closer). The fix is always to remove the ledger, install proper flashing per the manufacturer's detail (Simpson, Fortress, etc.), re-bolt with new bolts, and re-seal. This adds $800–$2,000 in labor and can delay your final inspection by 2-3 weeks.
To pass first inspection, get your engineer's or designer's flashing detail in writing on your sealed plan. Specify the flashing product by name and dimension (e.g., 'Simpson LUS210 ledger tie with 20-gauge galvanized flashing'). Show the slope direction in a cross-section. Install the flashing before the deck board, not after. Schedule your framing inspection only after the ledger is fully flashed and bolted, and take a photo of the detail before the inspector arrives — this helps speed the review. Rexburg inspectors are thorough and will reject any detail that does not match IRC R507.9 exactly.
City Hall, 20 West Main Street, Rexburg, ID 83440
Phone: (208) 359-3000 (main line; ask for Building Department) | https://www.rexburg.org (navigate to 'Permits' or 'Building Department' for online portal access)
Monday–Friday, 8:00 AM–5:00 PM (verify locally before visiting)
Common questions
Do I really need a permit if my deck is only 12 feet away from the house and not bolted to it?
If the deck is truly free-standing (no bolts, no attachments to the house at all, more than 18 inches from the siding), and it is under 30 inches high and under 200 square feet, it may be exempt under IRC R105.2. However, Rexburg Building Department inspectors often require a permit anyway if the deck is placed close to the house for 'clarity and safety.' Our recommendation: pull the permit if the deck is within 24 inches of the house. It costs $150–$200 and prevents a stop-work order.
What if I hire a contractor — do they handle the permit, or do I?
Most contractors in Rexburg will pull the permit as part of their bid and include the permit fee in the contract price. Ask your contractor explicitly: 'Are you pulling the permit, or am I responsible?' Once the permit is issued, the contractor is responsible for scheduling inspections and ensuring the work meets code. You remain the responsible party for the permit, so sign the application yourself and keep a copy for your records.
How deep do I have to bury the footings in Rexburg?
Footings must rest below the frost line, which is 36-42 inches in Rexburg depending on the specific neighborhood and soil type. The City of Rexburg and Bannock County can confirm the exact depth for your address. Some neighborhoods with expansive clay soils (South Rexburg near the golf course, some areas near the airport) may require deeper or special pier-and-beam systems; call the Building Department to confirm before you excavate.
Can I use pressure-treated lumber for the entire deck, including posts, or do I need composite?
Pressure-treated lumber (UC4B or better for ground contact) is code-compliant and cheaper than composite for posts and beams. Rexburg does not require composite. Use pressure-treated 4x4 or larger for posts and 2x8 or larger for beams. Composite or treated lumber is fine for deck boards; composite is more durable in Rexburg's cold-wet climate and does not rot. Untreated lumber is not allowed for any ground-contact or weather-exposed members.
If I'm building on expansive clay soil, does that change my permit cost or timeline?
Yes. Expansive clay soils (common in South Rexburg and some neighborhoods near the airport) require a geotechnical soil report ($400–$600) before the Building Department will approve footings. This adds 1-2 weeks to the permit review timeline and increases your overall project cost. Your engineer will specify special footing details (geotextile, gravel pads, or deeper footings) based on the soil report. Ask the Building Department if your address is in a mapped expansive soil zone.
What is the typical wait time for a footing pre-pour inspection in Rexburg?
Footing inspections in Rexburg are typically scheduled within 2-3 business days of your request. You call the Building Department (208) 359-3000, provide your permit number, and request an inspection date. The inspector meets you on-site, verifies the footing depth, takes photos, and issues a pass or fail on the spot. Plan ahead: don't call for an inspection if you're expecting rain (footing holes fill with water) or if it's below 32 degrees and the ground is frozen.
My neighbor says my deck is too close to his property line. Does the city care?
Yes. Rexburg code requires decks to be set back from side and rear property lines (typically 5-10 feet depending on zoning). If your deck is within 5 feet of a neighbor's line, you may need a survey ($300–$600) to verify the property boundary. If the deck actually encroaches on the neighbor's property, it must be relocated or removed. Resolve this before you submit your permit — the Building Department will ask for proof of line compliance, and a survey or deed reference is the quickest way to prove it.
If I'm adding electrical (outlet or lights) to the deck, is that a separate permit?
Yes. Outdoor electrical work (outlets, lights, hot tub wiring) requires a separate electrical permit and must be done by a licensed electrician. The electrical permit is roughly $75–$150 and is handled by Rexburg's Building Department along with the deck permit. Coordinate with your electrician: the electrical rough-in (conduit, boxes) is usually inspected before the deck is fully boarded, so the inspector can access the wiring.
What happens if I build the deck without a permit and then try to sell my house?
During the home sale inspection and appraisal, an unpermitted deck is flagged. Your title company and lender will require either (1) retroactive permit and final inspection (add 4-6 weeks and $300–$500), or (2) a signed engineer's letter stating the deck is code-compliant. Many sellers end up doing demolition instead ($2,000–$5,000 labor). Unpermitted decks also raise red flags for insurance claims and refinance. It is far easier and cheaper to pull the permit upfront.
Does Rexburg require a survey before I pull a deck permit?
A formal survey is not required unless your deck is within 5 feet of a side or rear property line, or if the property line is unclear from the deed. If you're confident the deck is well within your property, you do not need a survey. However, if a neighbor objects or the Building Department asks for proof of line compliance, a surveyor can verify boundaries quickly. A survey runs $300–$600 and is cheaper than a permit rejection or deck relocation.