Addition / Alteration Permit in Miles City, Montana
VerifiedRequired for additions and alterations to existing one- and two-family dwellings in Miles City, using the same Building Permit Application as new construction. Reviewed under the 2021 IRC as adopted via City Code § 5-46.
Verified 2026-07-03 · Source
When you need this permit
- Building permit required for 'Addition' or 'Alteration' classes of work per the Building Permit Application's Type of Improvement checklist
- Application must show building setbacks (front, rear, side x2), total building square feet, building dimensions, and zoning district
- Construction plans (site plan, floor plan, wall section drawings, stamped truss, floor joist info) submitted as applicable to the scope of work
- Same 180-day application-abandonment provision (IBC Section 105.3.2) and inspection-request duty (IBC Section 110) apply as for new construction
Required documents
- Required
Building Permit Application
Same City of Miles City Building Permit Application form used for new construction; Class of Work marked 'Addition' or 'Alteration'
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit Fee (valuation-based, same schedule as new construction) | Set by City of Miles City fee schedule adopted by council resolution under City Code § 5-4; specific dollar-valuation table not independently locatable as a standalone published document as of this review | City of Miles City Code § 5-4 (Ord. No. 1378, 5-28-24) — see GENUINELY UNPUBLISHED note under the Building Permit type for the full avenues-exhausted list |
| Building Plan Review Fee (projects valued $50,000 or more) | 30% of the Building Permit Fee | City of Miles City Code § 5-4 (Ord. No. 1378, 5-28-24) |
Review timeline
1–10 business days
Miles City’s published plan-review target
Inspection process
Tips
- Review timeline governed by statute: an addition/alteration to a one- or two-family dwelling is filed on the same single-family-dwelling Building Permit Application, so MCA 50-60-106(2)(c) applies — Miles City (certified under 50-60-302 for Building) must issue 'the relevant building permit or notice of plan disapproval within 10 working days of the contractor's submission' when the department's single-family-dwelling checklist is attached to the plans. The 1-working-day floor reflects that a complete, clean submittal can issue sooner. The city publishes no separate SLA (independently reconfirmed 2026-07-03).
- Accessory Dwelling Units (attached apartments or detached units including apartments over garages) are permitted through this same Building Permit Application, plus compliance with the ADU zoning standards in City Code § 24-65 (one ADU per lot, ≤2 bedrooms, ground floor area ≤50% of the principal dwelling's, matching roof pitch/siding/trim, 1 off-street parking space).
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Miles City Building Department — official building department
- Building Department | Miles City, Montana
- City of Miles City Building Permit Application (PDF, Rev. 12/28/2023)
- Miles City Code of Ordinances § 24-65 — Accessory dwelling units (Municode)
- MCA 50-60-106(2)(c) — certified jurisdiction must issue building permit or notice of plan disapproval within 10 working days of submission (single-family dwelling, department checklist attached)
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 Miles City building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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