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Five counties have had their own code read — the rest answer from state law:

Appearance

Steel-framed / barndominium

A steel frame or metal building shell finished as a dwelling. Typical standard-finish figures cluster around $95 to $110 per square foot.

At 1,500 sq ft
$114,000–$268,500
Timeline
4–8 months

What this figure rests on

Trade and vendor publications only — indicative

Vendor and trade publication guidance, drawn largely from barndominium-style suppliers rather than a survey of completed Oregon projects. Indicative only.

Last verified August 16, 2026 · source

What it costs, broken down

  • Steel-framed / barndominium — base construction$97,500–$240,000

    Published ranges for this method generally cover the structure rather than a complete finished build.

  • Insulation penalty$4,500–$10,500

    Spray foam is commonly used in metal buildings at roughly $3 to $7 per square foot, against roughly $1 to $2 per square foot for batt insulation in wood framing. This erodes part of the headline cost advantage.

  • Slab$12,000–$18,000

    A standard slab commonly runs roughly $8 to $12 per square foot depending on soil conditions and load requirements.

Advantages

  • Commonly twenty to thirty percent below comparable stick-built
  • No load-bearing interior walls, cutting framing labour and materials substantially
  • Shell can be erected quickly; large clear spans suit shop and storage use

Tradeoffs

  • Insulation is more expensive than in wood framing
  • Appraisal and resale comparables can be thin in some markets
  • Lender familiarity varies; some treat these as non-standard collateral

What building does to the tax base

Oregon generally limits growth in a property’s maximum assessed value to three percent per year, and treats new construction as an exception to that limit.

In general terms, holding unimproved land tends to mean a low tax base that grows slowly and predictably.

Adding a dwelling generally causes a step change in assessed value rather than a gradual increase, because the new structure is brought onto the roll at its own value rather than inheriting the capped figure.

Illustrative assessed value added: $57,000–$228,225

This range is illustrative only. It applies a wide assumed ratio to construction cost to show rough scale and direction, and is not a tax estimate. Actual assessed value depends on the county’s changed property ratio for the year and the assessor’s valuation, and the resulting tax also depends on the district’s permanent rate.

  • Ask the county Assessor how new construction would be brought onto the roll for this property.
  • Ask for the current changed property ratio and the applicable district tax rate.