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Change of Use Permit (via Town Building Permit) in Darby, Montana

Required when a building's occupancy or use classification changes within the Town of Darby. Darby publishes no separate change-of-use application form or standalone certificate-of-occupancy process; a change of use is filed as a flat-fee line item on the Town's general Building Permit process (the same application and in-person submission at Town Hall used for all other structural/building work), per the Town's own Building Permit Fee Schedule.

Verified 2026-07-22 · Source

When you need this permit

  • File using the Town of Darby Building Permit Application (same form and process as other building work); no separate change-of-use-specific application form is published by the Town
  • Fee is a flat Miscellaneous Permit Fee per the Town's Building Permit Fee Schedule (see fees)
  • No standalone certificate-of-occupancy (CO) permit or process, distinct from the change-of-use line item, was found published on the Town's website as of this review

Required documents

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Fee schedule

Change of use (flat fee)Town of Darby Building Permit Fee Schedule (Res. 649, updated 4/13/2021), Miscellaneous Permit Fees table. Re-extracted and cross-checked directly from the source PDF on 2026-07-22 using two independent extraction methods (pdftotext -table and pdftotext -raw), both of which pair 'Change of use' with $75.00 and 'Sign' with $50.00 -- the opposite of the $30.00/$75.00 pairing recorded in this same file's residential-building-permit entry (lastVerified 2026-07-03), which appears to have resulted from a row-misaligned read of the same PDF's column layout via a third extraction method. This entry uses the freshly re-verified pairing; the residential-building-permit entry was left untouched per this task's scope and should be corrected in a follow-up pass.
$75.00

Review timeline

Plan review
Not published — contact the department

How long did your Change of Use Permit (via Town Building Permit) permit actually take in Darby?

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Inspection process

    Tips

    • A change of use is not a separate permit type in Darby's own paperwork -- it is a $75.00 flat-fee line item on the same Building Permit Fee Schedule used for re-roofing, siding, demolition, and signs.
    • Darby does not publish a distinct certificate-of-occupancy form or process; contact Town Hall (101 E Tanner Ave / PO Box 37, Darby, MT 59829, (406) 821-3753) directly to confirm what documentation, if any, is issued at the close of a change-of-use review.

    Frequently asked questions

    Darby requires a change of use permit (via town building permit) for: File using the Town of Darby Building Permit Application (same form and process as other building work); no separate change-of-use-specific application form is published by the Town; Fee is a flat Miscellaneous Permit Fee per the Town's Building Permit Fee Schedule (see fees); No standalone certificate-of-occupancy (CO) permit or process, distinct from the change-of-use line item, was found published on the Town's website as of this review. If your project isn't listed, confirm with Town of Darby Building Department at (406) 821-3753 before starting work.

    In Darby, the published Change of use (flat fee) is: $75.00. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

    Darby does not publish a plan-review timeline for this permit. Contact Town of Darby Building Department at (406) 821-3753 for current turnaround.

    You'll need: Building Permit Application. See the required-documents checklist on this page for details on each.

    Apply through Town of Darby Building Department at 101 E Tanner Ave / PO Box 37, Darby, MT 59829. Phone: (406) 821-3753, email: darbymontana@usa.net. Office hours: Town Hall: Monday-Friday, 8:00 am - 5:00 pm. Source: Town of Darby Contact Us page (darbymt.net/a/contact-us/). Building permit applications and fee payment are handled in person at Town Hall; the current contracted building inspector is Construct Montana, LLC, (406) 552-3238, inspector@constructmt.com; the Montana DLI-certified program contact of record is Tim Netzley, (406) 961-2423 (also listed as (406) 880-5832 on the Town's own Building Permit Application form).. Official information: https://www.darbymt.net/a/building-related-code/.

    Darby, Montana has adopted: Montana has a mandatory statewide building code administered by the Montana Department of Labor & Industry (DLI) Building Codes Bureau, amended by the Administrative Rules of Montana (ARM) Title 24, Chapter 301. Cities, counties, and towns may become 'certified' to locally administer permitting and inspection for all or part of the code; a certified local program's adopted code 'may include only codes adopted by the Building Codes Bureau' (ARM 24.301.202). Non-certified areas fall under direct state administration by the DLI Building Codes Bureau. Source: Montana DLI Building Codes Bureau, Certified City, County and Town Programs page (bsd.dli.mt.gov/building-codes-permits/certified-government).; Darby is a Montana DLI-certified jurisdiction for Building (B), Plumbing (P), Mechanical (M), Electrical (E), and Swimming Pool (SP) — full trade certification — within Darby town limits ('City Limits' jurisdiction scope). Certified program contact on file with DLI: Tim Netzley, (406) 961-2423. Verified directly against the DLI's official 'Certified City, County and Town Programs' roster PDF (updated 2026-04-22): row reads 'Darby | B, P, M, E, SP | Tim Netzley | 961-2423 | City Limits'. Source: https://bsd.dli.mt.gov/_docs/building-codes-permits/certified-city.pdf; The Town's own Building Permit Application states: 'All work shall conform to the most current building codes - IBC, IRC, IEBC, ISPSC, IECC, NEC, IMC, IFGC, UPC and Montana A.R.M; and applicable local codes' and 'Electrical, Plumbing, Mechanical permits are applied for and inspected by Town of Darby, effective September 16, 2021.' Source: Town of Darby Building Permit Application (amended 2022-03-23), https://www.darbymt.net/a/wp-content/uploads/2022/03/Building-Permit-Application-amended-2022-03-23.pdf; Montana uses the Uniform Plumbing Code (UPC), not the International Plumbing Code — confirmed on Darby's own Plumbing Permit Application, which requires a licensed Master Plumber 'in accordance with Title 50, Chapter 60, Section 505, MCA and Sections 8.70.302, 8.70.303, 8.70.304, and 8.70.305 ARM' and states 'All provisions of the Uniform Plumbing Codes and the International Building codes will be strictly enforced.' Source: Town of Darby Plumbing Permit Application (2023-08-22), https://www.darbymt.net/a/wp-content/uploads/2023/08/Plumbing-Permit-Final-TOD-2023-08-22.pdf; State-adopted code editions in effect statewide since June 11, 2022 (per DLI Building Codes Bureau, applicable as the baseline Darby enforces as a certified jurisdiction): 2021 IBC, 2021 IRC, 2021 IEBC, 2021 IMC, 2021 IFGC, 2021 IECC, 2021 UPC, 2020 NEC, 2021 ISPSC. Source: Montana DLI Building Codes Bureau, Current Codes page, https://bsd.dli.mt.gov/building-codes-permits/current-codes. Darby's own permit application does not list specific code-edition years locally; no local re-adoption ordinance/administrative order text was found published online (Town Hall does not publish a codified municipal code online) beyond the applications' own reference to 'most current building codes'.. Local amendments apply — see the Darby overview page for the full list.

    No standalone certificate-of-occupancy process is published. Darby's own Building Permit Fee Schedule lists 'Change of use' as a $75.00 flat-fee line item processed through the Town's general Building Permit Application.

    Sources & verification

    Verified against official sources. Last reviewed 2026-07-22.

    Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Darby building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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