Building an ADU in Idaho Falls? SwagerBuilds LLC is a 4th-gen Rigby-based custom home builder with 20 years of Eastern Idaho + Teton Valley experience. Fixed-price contracts, no allowances, in-house design, direct engineer network. Detached ADUs, attached, garage conversions, guest houses. Answer 8 questions below and we’ll get back to you within 24 hours with real numbers.
Serving Idaho Falls, Ammon, Iona, Ucon, Rigby, Rexburg, and the broader Teton Valley + Jackson Hole service area.
Why SwagerBuilds for your Idaho Falls ADU
- Fixed price. No allowances. Every dollar in your contract is locked before ground breaks.
- In-house design + trusted engineer network. No waiting on outside firms.
- JobTread transparency. You see every subcontractor, every dollar, every day — from anywhere.
- 20 years watching budgets blow up in this valley. We know where money leaks.
Tell us about your ADU project
What happens after you submit
Within 24 hours: quick call to confirm the scope + a ballpark cost range for your specific project. If it’s a fit, we schedule a site visit. If it’s not, we tell you honestly and point you in the right direction.
FAQ
Do you build ADUs in Idaho Falls specifically?
Yes — Idaho Falls, Ammon, Iona, Ucon, Rigby, Rexburg, plus Teton Valley (Driggs, Victor) and Jackson Hole.
What’s a typical ADU cost in Idaho Falls?
Detached ADU: $150–$275/sq ft turnkey (2026). Attached: $120–$220/sq ft. Garage conversion: $80–$150/sq ft.
Permits + setbacks in Idaho Falls?
We handle it — Bonneville County + City of Idaho Falls. Setback, height, and utility rules vary by lot.
How long from signed contract to keys?
4–7 months for detached ADU, 3–5 for attached or garage conversion. Weather + permit timing move it.
Can I rent it out?
Idaho Falls allows long-term ADU rentals in most residential zones. Short-term (STR) rules are tighter — verify with the city before speccing STR use.
Can I finance it?
Yes — construction loans through several local lenders. We coordinate. If you’re an out-of-state owner, see Build From Anywhere.
Ready to talk?
Fill out the form above OR call directly: Bryce cell (208) 530-0348 · Office (208) 520-0636