Guides

Guides to building a custom home in Ashton

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.

What is 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

The two numbers most of these guides come back to

Almost every question about building here lands on the same county ordinance. It is worth reading once in its own words:

“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)

• 90 PSF ground snow load in the Ashton District, and 115 PSF in the North Fork Highlands district above it — two of the four districts the ordinance defines.
• 32 inches minimum frost depth for footings, applied countywide.
• 2018 IRC, IBC and IECC are the adopted codes, so energy-code compliance is part of the permit file, not an afterthought.
• The snow load varies by district; the frost depth does not. One number depends on where your lot sits and the other applies across the whole county.

How a guide gets written

1. A real question arrives from someone actually building, buying or subdividing here.
2. The primary document is read in full — the county ordinance, the county form, the state study — never a search-result summary of it.
3. Figures are quoted with their source and retrieval date, so the claim can be checked and a stale one is obvious.
4. The page says where the answer runs out and names the office or licensed professional who owns the rest of it.

Related reading on this site

• The builder table — the six firms working out of Ashton and the corridor, with registration numbers
• Who writes this — the researcher behind the site, and what he is not
• How this site is paid — the business model in plain language, including what it costs you
• Reviews and references — why there are no testimonials here yet, and what to ask for instead

Common questions

What do these guides cover?

The things a Fremont County building file actually turns on: the Ashton District snow load, the 32-inch frost depth, the county permit sequence, well and septic diligence on acreage, what drives a custom-home price here, and which builders run log, timber and structural insulated panel work.

How often is a new guide published?

Most weekdays, never on a Sunday. Longer pieces land Monday, Wednesday and Friday; shorter single-question answers fill the days between. Each page carries the date it was published and the date its figures were last checked.

Are the numbers in these guides verified?

Yes, and against the original document rather than a summary of it. The 90 PSF and 32-inch figures come from the text of Fremont County Ordinance No. 2005-02 itself. Where a county form is cited, it was fetched on the date shown to confirm it was still live.

Why do some links to county documents break?

Fremont County renumbers its DocumentCenter files from time to time — the building permit application has already moved once. Every county link on this site is re-checked when a page is updated, and the document table on the home page is the single place they are maintained.

Do the guides cover Island Park or St. Anthony?

No. This site is Ashton, Chester, Drummond, Warm River and the Henry's Fork corridor between them. Other parts of Fremont County sit in different snow-load districts with materially different design figures, and mixing them is how people end up quoting the wrong number to an engineer.

Can I ask for a guide on something specific?

Yes, and those make the best pages. If you are working through a question about a corridor lot and cannot find a straight answer anywhere, send it over — the answer becomes a guide if it is likely to help the next person too.

Is any of this legal or engineering advice?

No. It is research, sourced and dated so you can check it. Design figures belong to a licensed Idaho structural engineer, permit decisions belong to the county building department, and the construction belongs to the builder you hire.

Does a builder pay to be featured in a guide?

No. No builder has paid for placement, wording or omission in anything published here, and the table of local firms is compiled from public records. How the site is funded is set out in full on its own page.