Who builds custom homes in Ashton, Idaho

By Kjel Jones — independent custom-home researcher for Ashton and the Henry’s Fork corridor. Not a builder and not a general contractor. Licensed Idaho real estate agent, LPT Realty.

Published 2026-08-13 · every figure below was checked against its primary source on the date shown.

The corridor’s builder bench, from the public record

This is the whole local field, not a shortlist. Everything in the table below came from county records, Better Business Bureau profiles, Idaho contractor registrations and chamber listings, checked on 13 August 2026. Where a firm publishes a registration number, it is printed so you can verify it yourself.

Builders working out of Ashton and the corridor, from county, BBB and chamber records checked 13 August 2026. Registration numbers are Idaho contractor registrations (RCE) as posted publicly.
Builder	Based	What the record shows
Ron Palmer Construction	Ashton	Building here since 1994. Stick-frame, log and structural insulated panel work — the corridor's deepest timber lane.
Steve Pinther Custom Build Homes	Ashton (412 Main St)	Started 1978, the longest-running builder on this list.
JM Home Services & Construction	Ashton	Owner Mark Loosli. BBB accredited since 15 September 2023, A+ rated; works a 70-mile radius.
Diamond X Construction Management	Ashton (483 Cherry St)	Owner Mitch Cherry. Idaho registration RCE-64179, active. BBB accredited, A+.
Oak & Stone Custom Homes Idaho	Ashton	Idaho LLC formed 13 July 2025 by Nicholas and Becky Abplanalp. BBB accredited, A−. Newest firm here.
Western Builders	Chester & St. Anthony	Steed family. Registrations RCE-1785 and RCE-8714; log home specialist, BBB A+.

Companies based in Idaho Falls, Rexburg and further afield also advertise into Ashton. That is not a mark against them — it is a scheduling question, and a fair one to ask: who is driving how far, in February, to be on your site.

What every Ashton build has in common

Fremont County sets the rules, not the town. A house on Main Street and a house on forty acres toward Drummond open the same county file, and two numbers from the same 2005 ordinance sit underneath both of them:

“Section 3. Ground Snow Load: The ground snow load shall be … 115 PSF. for the North Fork Highlands district. 90 PSF. for the Ashton District…”

“Section 4. Minimum Frost Depth for Footings: The minimum frost depth for footings shall be 32 inches.”
— Fremont County Ordinance No. 2005-02, Sections 3 and 4 (county-published PDF, retrieved 13 August 2026)

Those two figures — the district snow load and the 32-inch frost depth — drive more of your budget than any finish decision you will make. They set truss design, roof framing, and how deep the excavator digs before a footing can be poured.

Ground snow load, Ashton District: 90 PSF. The engineered figure your roof structure is designed against. The state's own study recommends a higher number for the town, which is worth resolving before plans are drawn.
Minimum frost depth: 32 inches. Countywide, no exceptions by district — what that does to a foundation quote.
Adopted codes: 2018 IRC, 2018 IBC and 2018 IECC. The energy code is the one most people are surprised by; it governs insulation and window performance.
Water and sewer are yours to prove. Outside city limits a lot needs a well and an approved septic design before it is buildable — the order to confirm them in.
Cost is a site-work question before it is a house question. Well depth, septic type, access length and power distance drive the spread here — what actually moves a corridor build budget.

Where the county paperwork actually lives

Every new house here runs through Fremont County Building Department, Fremont County Courthouse, 151 W 1st North, St. Anthony, ID 83445 — (208) 624-7200. Five county documents matter, one of them revised in 2026 and rarely seen by applicants, and the county renumbers them from time to time — the building permit application has already moved once. They are listed with their live IDs, each confirmed on 13 August 2026, in the guide to the county permit path, which is also where the sequence they belong in is set out.

A new custom homeFull builds on corridor acreage — permit path, well and septic, snow-load engineering. Log, timber & SIPAshton's own lane. Two builders here have run it for decades. Additions & remodelsAdding to a house that already stands, under the same county rules. Checking a lot firstWhat to verify about access, water, septic and snow load before you buy.

Guides published so far

Ashton’s snow load is 90 PSF — the state’s own study says 103. Which number holds up your roof?Fremont County Ordinance 2005-02 sets one figure for the whole Ashton District. The University of Idaho’s 2015 reference gives Ashton 103 psf, Warm River 108, Drummond 114. What your engineer designs to, and the question to ask before plans are drawn.Published 2026-08-13
Well and septic on an Ashton acreage lot — what to confirm before you buyA corridor lot with no water and no approved drainfield is a lot you cannot build on this year. The diligence order that keeps a purchase from stalling, written at Ashton and Drummond addresses.Published 2026-08-13
The Fremont County permit path for a new house in Ashton, step by stepWhich county form starts the file, what the building department wants attached, where the snow-load certification enters, and the 2026-revised letter most applicants have never seen. Every document ID verified live.Published 2026-08-13
What does it cost to build a custom home in Ashton, Idaho?No builder on the corridor publishes a price, and there are honest reasons — snow-load framing, well depth, septic design, and a short season. What is actually published, what drives the spread, and how to make three bids comparable.Published 2026-08-13

How to use this site

Start with the builder table above, read the guide that matches your question, then call. If you would rather write it down, the short form goes to the same place. What this site gets out of it is explained here, and who is writing it is explained here.

Common questions

Who builds custom homes in Ashton, Idaho?

Six firms work out of Ashton or the immediate corridor: Ron Palmer Construction (Ashton, since 1994), Steve Pinther Custom Build Homes (412 Main St, started 1978), JM Home Services & Construction (Mark Loosli), Diamond X Construction Management (483 Cherry St, RCE-64179), Oak & Stone Custom Homes Idaho (formed July 2025), and Western Builders in Chester. Several out-of-area companies also market into Ashton from Idaho Falls and Rexburg.

What snow load do I have to build to in Ashton?

Fremont County Ordinance No. 2005-02 assigns Ashton to a district with a 90 PSF ground snow load, and sets a 32-inch minimum frost depth for footings countywide. The University of Idaho's 2015 statewide study recommends a higher figure for the town itself, which is the single most useful question to put to a structural engineer before plans are drawn.

Do I need a building permit for a house in unincorporated Fremont County?

Yes. The county's Building Permit Application covers every structure except manufactured homes, which have their own form. The county also publishes a threshold sheet titled “Do I Need A Building Permit?” — worth reading before assuming a shop, barn or addition is exempt.

Does this site build houses?

No. This site is written by Kjel Jones, an independent researcher, and it holds no contractor licence and swings no hammers. The licence, the crew, the insurance and the warranty all belong to the builder you hire. This site's only job is to help you find the right one and know what to ask.

Is there a charge to call?

No, in either direction. Reading costs nothing and calling costs nothing. There is no fee to a homeowner at any point, and no automated text sequence — a person answers the line.

Which towns does this cover?

Ashton, Chester, Drummond, Warm River, Marysville and the Henry's Fork river corridor around them, all in Fremont County, Idaho. Building rules here are county rules, so the same permit file applies whether the lot is in town or on acreage outside it.

How do I know a builder is registered in Idaho?

Idaho registers contractors through the Division of Occupational and Professional Licenses and issues an RCE number. Two firms on the table above publish theirs: Diamond X holds RCE-64179 and Western Builders holds RCE-1785 and RCE-8714. Ask for the number, then verify it against the state's public search rather than the company's own website.

Can you recommend one builder over the others?

Not as a ranking. The corridor is small enough that the useful sorting is by lane and by calendar — who does log and panel work, who is taking a start this season, who has run your kind of foundation. Describe the lot and the plan and you get an honest read on which of them to call first.

Ask about a build in Ashton

Tell us the lot and the rough idea. You get a straight answer about who in the corridor does that kind of work, and what the county will want before a shovel moves. No cost, no obligation, no automated texts.

Send the lot location and what you want to build.
We point you at the builders here who actually do that work.
You talk to them directly — we never sit in the middle of your contract.

Either an email or a phone number is enough. We reply from a person, not a sequence.