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§ 02
When a permit is required
Permit triggers and exempt work for Platte County
The county states permits are processed for new construction, accessory structures, renovations/additions, decks, swimming pools, solar panels, electrical/generator upgrades, mechanical change-outs, demolitions, retaining walls, signs, and commercial projects in unincorporated areas.
Mechanical like-for-like change-outs when not changing from gas to electric or electric to gas
Retaining walls 4 feet high or less, measured from bottom of footing to top of wall, when they do not support surcharge and do not have sloped backfill
- Exempt Mechanical like-for-like change-outs when not changing from gas to electric or electric to gas
- Exempt Retaining walls 4 feet high or less, measured from bottom of footing to top of wall, when they do not support surcharge and do not have sloped backfill
Note: No broader countywide exempt-work list was posted on the public permit page; confirm with Planning and Zoning before assuming an exemption.
Required documents
- Owner and contractor contact information
- Site plan with setbacks/easements/floodplain
- Plans or drawings
- Valuation
- Signed notarized affidavit
- For commercial work: utility, sewer, fire, and access approvals as applicable
- Building code
- 2018 International Building Code and 2018 International Residential Code; also references National Electrical Code and other locally adopted standards.
- Owner-builder
- Applications may be submitted by owner, lessee, architect, engineer, builder, or agent; property owner name must match the recorded deed on many permit types.
- Contractor requirements
- Public page requires contractor information on applications; no countywide contractor licensing page was located. Confirm trade licensing or registration requirements with Planning and Zoning.
§ 03
Application process
Typical processing: Not published as a fixed turnaround; inspections require 24 hours advance notice.
- 01 Create or log into a profile on the county website.
- 02 Open My Profile, then Applications, and select the appropriate building permit type.
- 03 Upload all required plans, documents, and project details; permits are reviewed only after required documents are uploaded in full.
- 04 County staff reviews for zoning, building code, and related agency compliance, including floodplain and land disturbance review where triggered.
- 05 Pay fees, obtain issuance, and keep approved plans on site for inspections.
Typical processing time: Not published as a fixed turnaround; inspections require 24 hours advance notice.
§ 04
Fee schedule
Platte County building permit fees
Fee type
Amount
01
Minimum permit fee
$25 for retaining wall permit; $25 for residential demolition permit; $50 for electrical/mechanical/solar permit; $75 for pool or sign permit
02
Plan check fee
Commercial permits also require payment of the county consulting engineering firm review cost before rough-in inspection.
03
Permit fee formula
Mixed. Examples: deck permit $25 plus $0.10 per square foot over 300 square feet; swimming pool permit $75; fire rebuild permit $100 for first 500 square feet plus $0.05 per additional square foot; commercial building permit $500 for first $5,000 estimated cost plus $25 for each additional $5,000.
Fee collection occurs after application review and before issuance; some permit types also require refundable bonds or notarized affidavit filings by final inspection.
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- County portal (online)
- inspection@co.platte.mo.us (email)
- (816) 858-3338 (phone)
- Scheduling deadline
- Inspection requests due 24 hours in advance
- Inspection hours
- Monday through Friday 8:00 am to 5:00 pm
- Time windows
- AM route 9:00 am to 12:00 pm; PM route 2:00 pm to 4:30 pm
Typical sequence: Footing/pier, suspended slab engineer report if applicable, bonding for pools, prebackfill, ground rough, all trades rough-in, gas, final; permit-specific third-party certifications may also be required.
§ 06
Frequently asked
Common questions about unincorporated Platte County permits
01 Do I need a building permit in unincorporated Platte County, MO? ▸
The county states permits are processed for new construction, accessory structures, renovations/additions, decks, swimming pools, solar panels, electrical/generator upgrades, mechanical change-outs, demolitions, retaining walls, signs, and commercial projects in unincorporated areas.
02 How much does a building permit cost in unincorporated Platte County, MO? ▸
Building permit fees in unincorporated Platte County, MO are set by the local building department and vary by project type and valuation. The minimum permit fee is $25 for retaining wall permit; $25 for residential demolition permit; $50 for electrical/mechanical/solar permit; $75 for pool or sign permit. Fees are calculated as: Mixed. Examples: deck permit $25 plus $0.10 per square foot over 300 square feet; swimming pool permit $75; fire rebuild permit $100 for first 500 square feet plus $0.05 per additional square foot; commercial building permit $500 for first $5,000 estimated cost plus $25 for each additional $5,000.. Plan check fee: Commercial permits also require payment of the county consulting engineering firm review cost before rough-in inspection..
03 How do I apply for a building permit in unincorporated Platte County, MO? ▸
To apply for a building permit in unincorporated Platte County, MO, follow these steps: 1. Create or log into a profile on the county website. 2. Open My Profile, then Applications, and select the appropriate building permit type. 3. Upload all required plans, documents, and project details; permits are reviewed only after required documents are uploaded in full. 4. County staff reviews for zoning, building code, and related agency compliance, including floodplain and land disturbance review where triggered. 5. Pay fees, obtain issuance, and keep approved plans on site for inspections.
04 How long does it take to get a building permit in unincorporated Platte County, MO? ▸
Building permit processing times in unincorporated Platte County, MO typically run Not published as a fixed turnaround; inspections require 24 hours advance notice.. Timelines can vary based on project complexity and current department workload.
05 What work is exempt from building permits in unincorporated Platte County, MO? ▸
Not all construction work requires a permit in unincorporated Platte County, MO. The following work is generally exempt: Mechanical like-for-like change-outs when not changing from gas to electric or electric to gas; Retaining walls 4 feet high or less, measured from bottom of footing to top of wall, when they do not support surcharge and do not have sloped backfill. Note: No broader countywide exempt-work list was posted on the public permit page; confirm with Planning and Zoning before assuming an exemption. When in doubt, confirm with the local building department before starting work.
06 How do I schedule a building inspection in unincorporated Platte County, MO? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Platte County, MO via: County portal, inspection@co.platte.mo.us, (816) 858-3338. Inspection requests due 24 hours in advance.
last verified April 2026
source Platte County Planning and Zoning ↗
entry id permits/missouri/platte/platte-county
Educational reference. Permit rules and fees change — confirm current requirements directly with Platte County Planning and Zoning before applying. Jaspector is not legal advice.