DARBY CUSTOM BUILDING

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A structure under assembly inside the Darby Custom Building shop, roof beams on the overhead hoist

Darby Custom Building, LLC

Rugged, efficient, engineered.

Portable field units built indoors in Choteau, Montana — then delivered to your site ready to connect. Thirty-plus years of field experience behind every build.

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Who we are

Structures built to move.

Darby Custom Building, LLC provides portable field units from its production facility in Choteau, Montana. With more than 30 years of field experience, plus partner facilities in Livingston, MT and Rolette, ND, we deliver rugged and efficient structures tailored to your specifications and your site — year round.

Because we build indoors under consistent temperature, humidity and light, weather never sets our schedule or our tolerances. The structure that leaves our shop is finished and ready to connect to utilities — permanent or temporary.

Core Competencies

  • Project Design + Planning
  • Wood / Steel Construction
  • Controlled Environment Facility
  • Structural Design
  • Production-Driven Assembly
  • Building Transport & Placement
  • Energy Efficiency
  • Interior / Exterior Finish

Cabins · Bunkhouses · Field Units · Studios · Utility buildings

Differentiators

What Sets Us Apart

Indoor Construction Facility

Consistent temperature, humidity and light mean consistent quality — and a schedule that does not move because the weather did.

Common-Sense Approach

Straightforward design and planning that delivers quality structures tailored to your needs, in a timeframe you can plan around.

Delivery & Placement

We transport to your site. Your structure arrives ready to connect to utilities, permanent or temporary.

Portable Field Units

Engineered to redeploy. When your project or site requirements change, we handle transport and re-siting to keep pace with your operations.

Innovation & Adaptability

We are constantly looking to improve our process, methods and materials — and to adapt them to what a given requirement actually needs.

You Talk to the Builder

Sean Darby answers the phone. No account team, no gatekeeping — you speak to the person who runs the shop floor.

Inside the shop

Built For Transport and Site Conditions

Close-up of post-and-beam joinery showing tight, square timber connections
Carpenter making a precision cut on the mitre saw in the shop
The shop tool wall and finished floor, with a carpenter at work

For contracting officers

Capability Statement

Everything a contracting officer needs is on this page, in the registration data below.

NAICS Codes

  • 321992 Prefabricated Wood Building Manufacturing — primary
  • 236118 Residential Remodelers
  • 236115 New Single-Family Housing Construction
  • 238130 Framing Contractors
  • 238350 Finish Carpentry Contractors

Product Service Codes

  • 5410 Prefabricated Structures
  • Z2AA Repair/Alteration — Family Housing
  • Z2FA Repair/Alteration — Other Buildings

Company Data

Legal Name Darby Custom Building, LLC
Unique Entity ID XGZVQEDQDJL4
CAGE Code 1ZWP3
Location Choteau, Montana
Point of Contact Sean Darby
Phone (406) 223-3460
Email sean@darbycustombuilding.net

Registered and active in SAM.gov.