Basement finishing in Idaho Falls
Need bedrooms for a growing family, a second bath or a place to watch the game? One call connects you with a basement finishing contractor who works in Idaho Falls and nearby towns.
Basement work we can connect you with
- Complete basement finishingFraming, insulation, wiring, heat, drywall and floors that turn bare concrete into finished rooms.
- Basement remodelsReworking an older finished basement: new layout, updated wiring and insulation, fresh surfaces.
- Basement bathroom additionsA new bath downstairs, from slab trenching or a builder rough-in to the final plumbing inspection.
- Legal basement bedroomsEgress windows, wells, alarms and permits so a basement room counts as a real bedroom.
- Home theaters and wet barsMedia rooms, game rooms and bars with wiring, plumbing, lighting and sound control built in.
How it works
Call us or send a request
Let us know your town and what you want built downstairs.
We connect you
We pass your request to an independent basement finishing contractor that serves eastern Idaho.
The contractor calls
They visit, measure and price the job directly with you.
What is basement finishing?
Basement finishing is the work of turning an unfinished lower level into rooms you'd want to spend time in. For an Idaho Falls home, that typically means framing walls, insulating the foundation and rim joist, adding circuits and lighting, extending heating and return air, hanging drywall, and installing doors, trim and flooring, all with city inspections along the way. Bedrooms, a bathroom, a laundry room, a theater or a bar can be part of the plan. The company you're connected with visits, listens to how you want to use the space and puts the scope and price in writing.
What does the City of Idaho Falls require?
A building permit. The city's Building Division lists what a basement finish application needs: a residential building permit application and a floor plan with dimensions, room labels, the size and location of existing and new windows, doors, stairs and window wells, and any walls being added or removed. Removing a load-bearing wall, which the city defines as any wall supporting more than its own weight, also requires a beam schedule and design. Plans can be uploaded through the city's ETRAKiT online system. Inspections follow in order: framing, rough-in electrical, mechanical and plumbing, insulation, drywall, and finals.
Any room used for sleeping has to have an egress window, according to the city. That's the item most likely to change the cost of an Idaho Falls basement plan.
Why plan carefully in eastern Idaho?
- Cold winters. Idaho Falls sits at about 4,700 feet on the upper Snake River Plain, averages around 37 inches of snow a year and has recorded a low of 51 degrees below zero. The city's building department uses a 30-inch frost depth. Basement walls and rim joists get cold, so insulation and air sealing need to be done right to keep condensation out of the new walls.
- Radon. The Idaho Department of Health and Welfare says 2 in 5 tested homes across the state have higher-than-recommended radon, and radon has been found in every Idaho county. Test before you finish so the slab and walls are still easy to reach if you need a mitigation system.
- Growing families and newer homes. Ammon grew 28 percent and Iona about 50 percent between 2010 and 2020, and many newer homes in Idaho Falls, Ammon and Iona were built with unfinished basements meant to become bedrooms as families grow.
- Different permit offices. Idaho Falls, Ammon, Iona, Rigby and Shelley each have their own city rules, and rural addresses fall under Bonneville, Jefferson or Bingham County.
What does a basement finish cost?
Ranges in national cost guides are wide. This Old House's 2026 estimate runs about $7 to $23 per square foot for finishing; Angi lists $30 to $75 per square foot for remodeling an existing basement. Square footage, the number of bedrooms and egress windows, plumbing for a bath or bar, ductwork and ceiling height, and flooring and trim all affect the number. The company you're connected with gives you its own quote after a visit; this site doesn't price jobs. More detail is in the Idaho Falls basement finishing guide.
What should you check before hiring?
Idaho requires contractors to register with the Division of Occupational and Professional Licenses for most jobs over $2,000, and registered contractors must carry at least $300,000 in general liability coverage and show their registration number on contracts and advertising. Ask for that number, who pulls the permit, how many egress windows the plan needs and what's included in writing.
Is this site a contractor?
No. Idaho Falls Basement Finishing is a referral service. We connect you with an independent basement finishing contractor that works in your area, and that company does the design, pricing, permits, construction and warranty. See how it works.
Areas we cover
Doing your homework? The Idaho Falls basement finishing guide covers permits, egress, radon and typical costs.
Common questions
Who finishes the basement?
An independent basement finishing contractor that works in the Idaho Falls area. We connect you with them; we don't do any construction ourselves.
Do I pay anything to use this site?
No. It's free for homeowners. The contractor quotes and bills the work directly.
Which towns do you serve?
Idaho Falls, Ammon, Iona, Rigby and Shelley, plus nearby places such as Ucon, Lincoln, Firth and rural parts of Bonneville, Jefferson and Bingham counties.
Does a basement bedroom in Idaho Falls need an egress window?
Yes. The City of Idaho Falls says any room used for sleeping must have an egress window, and the floor plan for a basement finish permit has to show windows and window wells.
Need more room without moving?
Call and a local basement finishing contractor will walk the basement and the permit with you.