This is PermitBase’s published record for Unincorporated Madison County as of 2026-07-07. It has since been superseded — see the current record. A historical record reflects what PermitBase had verified at that time; it may not capture a real-world change the jurisdiction had made but PermitBase had not yet verified, and it includes any errors we later corrected. Snapshots are never edited retroactively.
Unincorporated Madison County building permits
VerifiedUnincorporated Madison County, Idaho — as published 2026-07-07.
Verified 2026-07-13 · Source
Codes adopted
Permit types & fees
Residential Building Permit (New Construction / Addition / Accessory Structure)
VerifiedRequired for detached one- and two-family dwellings and associated accessory structures in unincorporated Madison County — new construction, additions, basement finishes, remodels, garages, shops, decks, barns, and carports. Madison County Building Department has issued permits since 1976. Governed by the 2018 IRC as adopted and locally amended by Madison County Code Chapter 103. Each structure on a property requires a separate permit unless otherwise approved by the Building Official. Applications may be submitted via the county's iworq online Building Permit Portal or by physical/PDF submission.
Verified 2026-07-13 · Source
Requirements
- Building permit required for all new residential construction, additions, basement finishes, remodels, and accessory structures in unincorporated Madison County
- Septic Permit from Eastern Idaho Public Health required prior to Building Permit approval for new dwellings, or for remodels adding a bedroom/bathroom, or connecting to an existing septic system
- Recorded Warranty Deed (obtainable from the Madison County Clerk's Office); if applicant is not the legal owner, a notarized Affidavit of Legal Interest is required
- Site Plan showing setbacks, well, septic, property lines, and driveway(s)
- Copy of the Building Contractor's State of Idaho Registration, unless the project is owner-built
- One electronic copy (PDF) and/or one physical copy of plans, drawn to scale (minimum 1/8" = 1'-0"), formatted on 11"x17" paper, including: cross sections, elevations, full foundation drawing, window & door schedule, engineered truss design, engineered floor layout design
- Open spaces exceeding 900 sq ft require engineered plans per IRC Table R602.10.1.3 (seismic bracing), as determined by the Building Official
- Preliminary Elevation Certificate required before permit issuance if property is in a designated floodplain; Final Elevation Certificate required before Certificate of Occupancy
- Driveway Access Permit from the Madison County Road & Bridge Office
- Copy of subdivision covenants, if applicable
- Energy code compliance via prescriptive method (Prescriptive Path form in application) or REScheck analysis (Climate Zone 6B)
- Non-refundable Permit Fee Deposit due at submittal: $100 for accessory structures, $500 for non-accessory structures (including dwellings) — applied toward the total permit fee if approved
- Additional approvals may be required: Administrative Permit/ADU approval from Planning & Zoning (for more than one dwelling unit on a parcel), Fire Marshal review for properties with significant slopes, Army Corps of Engineers permits for wetlands, Road & Bridge/Corps approval for bridges
- Electrical and plumbing work requires a SEPARATE permit through the City of Rexburg Building Department (contracted electrical inspection authority per I.C. 54-1001) — NOT issued by Madison County
Required documents
- RequiredBuilding Permit Application (Fillable v2, updated 2026-01-22)Madison County Building Department application for detached one- and two-family dwellings and accessory structures; includes contact info, property info, proposed use table, setbacks, signature/certification pages, and Prescriptive Insulation Requirements worksheet (Climate Zone 6B)
- RequiredSite PlanFull-size scaled drawing showing existing/proposed structures, septic, well, drain field, setbacks from property lines and county road centerlines, and waterways
- RequiredSeptic Permit (Eastern Idaho Public Health)Required prior to Building Permit approval for new dwellings or remodels adding a bedroom/bathroom
- RequiredRecorded Warranty DeedObtained from the Madison County Clerk's Office; Affidavit of Legal Interest required if applicant is not the property owner
- OptionalBuilding Contractor State RegistrationCopy required unless project is owner-built
- RequiredDriveway Access PermitObtained from the Madison County Road & Bridge Office
- OptionalPreliminary/Final Elevation CertificateRequired if property is within a designated floodplain — preliminary before permit issuance, final before Certificate of Occupancy
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Non-refundable Permit Fee Deposit (due at submittal, applied toward total fee) | $500 for dwellings/non-accessory structures; $100 for accessory structures | Building Permit Application (Fillable v2, 2026-01-22), Checklist item 10 |
| Total estimated permit fee (Permit + 10% Plan Review), by square footage | 0–1,500 sq ft: $1,450 | 1,501–2,500 sq ft: $2,175 | 2,501–3,500 sq ft: $2,900 | 3,501–4,500 sq ft: $3,625 | 4,501–5,500 sq ft: $4,300 | 5,501–6,500 sq ft: $4,825 | Madison County Building Department Permit Fee Estimates (Building), effective January 2025 — estimates only, subject to change; calculated using ICC Building Valuation Data with a fixed 10% plan review; final fee determined by county staff at permit issuance |
Agricultural Exempt Permit
VerifiedRequired for structures built on property where the primary land use is a bona fide agricultural operation and the structure is used exclusively for agricultural-related storage — barns, pole barns, hay sheds, farm equipment sheds, livestock shelters, poultry buildings, horticultural structures, and grain silos. May not be used for structures with any habitable space. Property must be at least 5 contiguous acres actively devoted to agriculture, meeting Idaho Code 63-604 eligibility for agricultural property tax appraisal. Governed by the 2018 IRC as adopted by Madison County.
Verified 2026-07-08 · Source
Requirements
- Property's primary land use must be a bona fide agricultural operation on more than 5 contiguous acres actively devoted to agriculture, per Idaho Code 63-604 agricultural property appraisal/taxation eligibility criteria
- Structure must be for agricultural storage/shelter use only (barns, pole barns, equipment sheds, livestock shelters, poultry buildings, horticultural structures, grain silos, stables) — no habitable area permitted
- Recorded Warranty Deed (Madison County Clerk's Office)
- Signed Understanding of Policy form (Agricultural Buildings Exemption)
- One electronic copy (PDF) and two physical copies of plans, scale no smaller than 1/8"=1', sheet size 11"x17": Site Plan (showing structures, septic, well, drain field, drain field replacement area, setbacks from side property lines, county road centerlines, waterways), Cross Sections, Elevations, Full Foundation drawing, Window & door schedule
- Copy of the Building Contractor's State of Idaho Registration
- Preliminary/Final Elevation Certificate if property is in a designated floodplain
- Permit fee payment ($150.00) plus review fee ($45.00) due upon application submittal
Required documents
- RequiredAgricultural Exempt Permit Application (2025)Madison County Building Department application for agricultural exemption structures; includes Agricultural Exemption Permit Checklist and Understanding of Policy form defining qualifying structures under Idaho Code 63-604
- RequiredSite PlanOne full-size scaled drawing showing existing/proposed structures, septic, well, drain field, drain field replacement area, and setbacks
- RequiredUnderstanding of Policy FormSigned acknowledgment of the Agricultural Buildings Exemption policy and qualifying-structure definitions
- OptionalInspection Checklist AgriculturalChecklist used by the Building Department for agricultural structure inspections
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Agricultural Exempt Permit fee | $150.00 | Agricultural Exempt Permit Application (2025), Checklist item: 'Permit fee payment - $150.00 and a review fee of $45 due upon application submittal.' |
| Review fee | $45.00 | Due upon application submittal, alongside the $150 permit fee |
Manufactured Home Installation Permit
VerifiedRequired for relocating and installing a manufactured/mobile home into unincorporated Madison County. Manufactured homes bearing HUD certification are regulated under Idaho Code Title 44, Chapter 22 rather than the standard Building Code enforcement provisions, but an Installation Permit must still be obtained from the county before placement. Homes not bearing a HUD certification label are not allowed except as provided under Idaho Code Title 44, Chapter 25.
Verified 2026-07-08 · Source
Requirements
- Owner or agent must apply for and receive an Installation Permit before placing any manufactured home on the property (Madison County Code Chapter 103, Sec. 2-3)
- Home must bear a HUD certification label; homes without HUD certification are not allowed except as provided under Idaho Code Title 44, Chapter 25
- Approved Septic Permit from Eastern Idaho Public Health
- Approved Driveway Access Permit from the Madison County Road & Bridge Office
- Recorded Warranty Deed (Madison County Clerk's Office)
- One electronic copy (PDF) and two physical copies of plans (scale no smaller than 1/8"=1', sheet size 11"x17"): cross sections, elevations, full foundation drawing, electrical plan showing smoke alarm/detector locations, window & door schedule, stabilizing/permanent foundation system drawings, site plan showing setbacks/well/septic/property lines/driveway
- Proof the manufactured home is constructed to withstand a minimum snow load of 50 P.S.F.
- Copy of the installer's license
- Preliminary/Final Elevation Certificate if property is in a designated floodplain
- Permit fee payment ($150.00) plus review fee ($45.00) due upon application submittal
Required documents
- RequiredManufactured Home Permit Application (2025)Madison County Building Department application for relocating a manufactured/mobile home into the county
- RequiredSite PlanShowing setbacks, well, septic, property lines, driveway
- OptionalInspection Checklist Manufactured HomeChecklist used by the Building Department for manufactured home installation inspections
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Manufactured Home Permit fee | $150.00 | Manufactured Homes page, madisoncountyid.gov: 'Permit fee payment - $150 and a review fee of $45 due upon application submittal.' |
| Review fee | $45.00 | Due upon application submittal, alongside the $150 permit fee |
Sources & verification
Verified against official sources. Last reviewed 2026-07-13.
Fee schedules
Applications & forms
Checklists & handouts
Online permit portal
Codes & ordinances
Department & other records
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 Unincorporated Madison County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.