I’m Bryce Swager. I’m a 20-year custom home builder from a 4th-generation Rigby entrepreneur family based in Rigby, and I run SwagerBuilds out of a shop at 4510 E 168 N — about fifteen minutes from the Bonneville County line and twenty from the west side of Idaho Falls. If you’re looking for a custom home builder in Idaho Falls, this page walks through 2026 construction cost tiers, how the city’s permit process actually runs, what my licensing across Idaho and Wyoming means for owners who split time in Jackson, and how I price and build — fixed construction contract only after a signed design agreement.

Who I Am and Why Idaho Falls Specifically

My family has been building businesses in eastern Idaho for four generations. I’m the first-generation builder in the family, with 20 years in construction. I’m registered as a general contractor in Idaho (RCE), hold what I need on the Wyoming side, my BuildZoom score is 94, and I run fixed-price construction contracts — not cost-plus, not open-book with markup drift. Idaho Falls is the closest metro to my Rigby shop. The custom alder and walnut millwork on your Idaho Falls build gets milled fifteen miles from your job site.

Idaho Falls is the seat of Bonneville County and the largest population center in eastern Idaho. That means two permitting authorities depending on your lot: the City of Idaho Falls Building Division inside city limits, and Bonneville County Planning, Zoning & Building for parcels in the unincorporated county. Ammon runs its own building department through the BluePrince portal with a published 5–10 business-day review target (cityofammon.us/services/building-permits). If your project is in the unincorporated county, we submit to Bonneville County Planning at 605 N Capital Ave (bonnevillecountyidaho.gov).

2026 Construction Cost Tier for an Idaho Falls Custom Home

SwagerBuilds custom homes in Idaho Falls run $400 to $1,000 per square foot in 2026 construction cost, on interior living space. Above that range means you’re choosing high-end finishes and fixtures, and that’s your call to make. Once the design and selections are set, your price is fixed. A fixed project price is locked only after a signed design agreement. What moves your number within that range:

• Finish level. Production-grade cabinetry and tile versus custom millwork out of my Rigby shop is the biggest single lever on your number.
• Site complexity. City sewer and water on a flat lot is a different number than acreage with a well, septic, engineered driveway, and long utility runs.
• Structural spans and design. Open spans, vaulted ceilings, walkouts, and heavy timber carry engineering and framing cost a simple rectangle doesn’t.

All-in project cost (land improvements, soft costs, design fee, contingency, financing carry) typically adds another 35–50% on top of construction cost. Most serviced Idaho Falls / Ammon city lots stay in builder-grade to mid-range. Unincorporated Bonneville County acreage with well, septic, and long utility runs pushes toward high-end.

Those tiers align with what NAHB’s 2024 Cost of Constructing a Home survey shows nationally — construction costs are now 64.4% of the average new-home price, and the national average per-SF baseline is roughly $162/SF on builder-grade national spec (nahb.org). Custom Idaho Falls work runs above that baseline because interior finishes alone eat 24.1% of construction cost (eyeonhousing.org) and custom-tier finish is where the delta lives. Sanity-check your project range with the custom home cost calculator and the full cost-to-build breakdown for Bonneville County.

Fixed-Price Construction Contracts, Not Cost-Plus

Every SwagerBuilds construction contract in Idaho Falls is fixed-price — but only after a signed design agreement. During the design agreement phase (typically 12–16 weeks), we lock the plan, spec every finish, get real bids from real subs, and hand you a fixed construction contract price. If a subcontractor no-shows or lumber moves the wrong way on a Tuesday, that’s my problem to solve. The only way the number moves after construction contract signs is if you change scope through documented change orders. My honest guide and cost reality pages walk through the specific traps in cost-plus that eat Idaho Falls owners alive.

The Idaho Falls Permit Process, Walked Through

The City of Idaho Falls Building Division sits at 308 Constitution Way and runs its intake through a documented permit-processing workflow. The current fee structure is published in the 2025–2026 Fee Schedule PDF at idahofallsidaho.gov — that’s the canonical document your permit fee is calculated from. The plan check fee for residential is a percentage of permit valuation, and starting work without a permit triggers double fees.

Submittals for a new custom home follow the city’s Residential Plans Requirements List (idahofallsidaho.gov/DocumentCenter/View/19930). At minimum: complete site plan with setbacks, driveway, and utility easements; foundation plan; framing and floor plans; cross-sections; elevations; window/door schedules; engineered truss layouts; electrical with smoke alarm locations; and energy-code compliance (ResCheck or the prescriptive path for Idaho’s Climate Zone 6 amendments). The full graphical process is on the city’s Permit Processing page (idahofallsidaho.gov/2081/Permit-Processing).

Idaho’s adopted residential code is the 2018 IRC with Idaho amendments (the Idaho Residential Code, 2020 Edition), with the 2023 NEC for electrical, 2018 IMC for mechanical, and the 2017 Idaho State Plumbing Code (DOPL adopted codes PDF). Energy compliance runs on the 2018 IECC with Idaho amendments. For Bonneville County snow-load engineering, ASCE’s Figure 7-1 lookup flags the county as “Case Study Required” (groundsnowbyzip.com) — site elevation and terrain get run through a site-specific analysis.

Why Cross-State Idaho + Wyoming Licensing Matters Here

A meaningful share of my Idaho Falls custom clients own or are considering a second property in Jackson, Wilson, Alta, or Teton Village. Hiring one builder who is registered in Idaho and current on Wyoming Teton County codes matters. I already know that Teton County WY is on the 2024 IRC/IBC as of 2/1/2025 (tetoncountywy.gov/560/Building), and that the Jackson-side design criteria — 105 mph wind, Seismic Design Category D, -30°F winter design temp, 34-inch frost depth, R-60 ceiling / R-20+5 wall envelope for Climate Zone 7/8 — are meaningfully different from Bonneville County’s Zone 6 requirements (Teton County WY Design Criteria). See the Jackson Hole custom home builder and Teton Village pages for the Wyoming side.

What We Build in Idaho Falls

• Custom homes. New construction on your lot or a lot I help you find. Fixed construction contract after design agreement, milled millwork, honest schedule. See custom homes and portfolio.
• Whole-home and luxury remodels. Master suite expansions, gut kitchens, whole-home renovations. Remodel scopes priced project-specific after site walk and design agreement. See remodels.
• ADUs and shop builds. Detached ADUs on Idaho Falls lots that allow them, plus shops and outbuildings across the corridor. See ADU builds Idaho Falls and shops.

Where I Build Across the Idaho Falls Metro

Service area for Idaho Falls owners covers the full Bonneville County footprint plus the immediate Jefferson and Madison county corridors: Ammon, Iona, Shelley, Ririe, Ucon, Bone Road out east, the greenbelt neighborhoods west of the river, the newer plats south of Sunnyside. My Rigby shop sits north of Idaho Falls in Jefferson County (Rigby page); the Ammon corridor sits directly east of the city (Ammon custom home builder page). For the broader regional footprint see the eastern Idaho hub page.

Idaho Falls owners who are also eyeing a mountain lot over the pass should read the Teton Valley custom home builder page — same crew, same fixed-price-after-design contract, different snow load, permit office, and build season. I run both markets from the same Rigby shop, so a valley-floor primary and a Driggs or Victor second home can move through one builder and one JobTread schedule.

Timeline Realities

• Design agreement phase: 12–16 weeks (design + engineering + finish spec + preliminary construction budget)
• Plan review + permit issuance: 1–4 weeks in Idaho Falls / Ammon; project-specific in unincorporated county
• Foundation and framing: 3–5 months
• MEP, insulation, drywall: 2–3 months
• Finishes and closeout: 3–4 months

Total: roughly 9–13 months from signed construction contract to closeout for a straightforward serviced-lot build. Idaho leads the nation in per-capita new construction rate — 21.2 authorized units per 1,000 existing homes, more than twice the national average per Census BPS data (constructioncoverage.com). Book early. Reserving a build slot through a signed design agreement is often the practical way to secure a start date.

How to Start

Fastest way in is the intake form. It routes straight to me. Or call (208) 520-0636.

More on how I work: process, reviews, FAQ, about, contact. For the Teton Valley delta see the 2026 Teton Valley line-item breakdown.

Bryce Swager, Founder — 20-year Rigby custom home builder. BuildZoom score 94. Licensed in Idaho + Wyoming.