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

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Shipping container

Structures built from modified shipping containers. Low shell cost, but the finished cost per square foot commonly overlaps conventional construction.

At 1,500 sq ft
$225,000–$450,000
Timeline
4–10 months

What this figure rests on

Trade and vendor publications only — indicative

Vendor and trade publication guidance, and the weakest basis of the six. Container conversions vary enormously with design, and published figures often exclude the engineering and insulation work needed to meet code in a cold or wet climate.

Last verified August 16, 2026 · source

What it costs, broken down

  • Shipping container — base construction$225,000–$450,000

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

Permitting and engineering: Container structures often require engineered drawings and additional review because they are not a standard prescriptive assembly. Budget for design and review time that conventional methods do not incur.

Advantages

  • Low entry cost for the shell
  • Shell can be placed quickly
  • Distinctive result; strong appeal for small structures

Tradeoffs

  • Finished cost per square foot frequently matches or exceeds stick-built
  • Insulation, condensation control and structural modification add substantial cost
  • Permitting and plan review are often the slowest and least predictable part; engineering stamps are commonly required

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: $112,500–$382,500

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.