On this page 6
§ 02
When a permit is required
Permit triggers and exempt work for Trenton
Town page expressly calls out new homes, additions, remodels, decks, fences, accessory structures, agricultural/commercial buildings, driveway work, and trade permits.
Required documents
- Permit application
- digital plans
- paper plans for listed project types
- Plan Review Checklist
- county signoff self-certification when building outside an existing footprint
- and project-specific supporting forms.
- Building code
- Town page links directly to Wisconsin DSPS and Wisconsin SPS 321.08 guidance.
- Owner-builder
- DSPS online building permit system is linked for relevant Wisconsin processing.
- Contractor requirements
- State trade and dwelling requirements apply; applicants should use the current forms.
§ 03
Application process
Application → plan check → issuance → inspection → final
- 01 Review the Building Permit Information page and determine whether the project needs a standard building permit, agricultural/commercial permit, electrical, HVAC, plumbing, driveway, culvert, or related permit.
- 02 Submit permit applications and digital plans by email to permits@townoftrenton.wi.gov; paper and digital plans are required for new homes, additions, remodels, decks, fences, and accessory structures.
- 03 Complete the Plan Review Checklist and, where the project extends outside the existing footprint, complete the Washington County Permit Signoff Self Certification Form and county self-certification instructions.
- 04 Pay by cash, check payable to Town of Trenton, or credit card/e-check through the posted MSB payment link.
- 05 Obtain permit issuance and complete required inspections with the building inspector.
Source: Town of Trenton Building Permit Information / Building Inspector ↗
§ 04
Fee schedule
Trenton building permit fees
Fee type
Amount
01
Minimum permit fee
See current 2026 forms and posted fee schedule.
02
Plan check fee
Included through application and review process as applicable.
03
Permit fee formula
Mixed by permit type with updated 2026 rates.
04
Reinspection fee
See current forms and fee schedule.
Cash, check, credit card, and e-check are accepted; card and e-check fees apply.
Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.
§ 05
Required inspections
Scheduling and sequence
How to schedule
- Contact permitting office (phone)
- Inspection hours
- Building inspector office hours Wednesday 3:00 p.m. to 5:00 p.m.
§ 06
Frequently asked
Common questions about Trenton permits
01 Do I need a building permit in Trenton, WI? ▸
Town page expressly calls out new homes, additions, remodels, decks, fences, accessory structures, agricultural/commercial buildings, driveway work, and trade permits.
02 How much does a building permit cost in Trenton, WI? ▸
Building permit fees in Trenton, WI are set by the local building department and vary by project type and valuation. The minimum permit fee is See current 2026 forms and posted fee schedule.. Fees are calculated as: Mixed by permit type with updated 2026 rates.. Plan check fee: Included through application and review process as applicable..
03 How do I apply for a building permit in Trenton, WI? ▸
To apply for a building permit in Trenton, WI, follow these steps: 1. Review the Building Permit Information page and determine whether the project needs a standard building permit, agricultural/commercial permit, electrical, HVAC, plumbing, driveway, culvert, or related permit. 2. Submit permit applications and digital plans by email to permits@townoftrenton.wi.gov; paper and digital plans are required for new homes, additions, remodels, decks, fences, and accessory structures. 3. Complete the Plan Review Checklist and, where the project extends outside the existing footprint, complete the Washington County Permit Signoff Self Certification Form and county self-certification instructions. 4. Pay by cash, check payable to Town of Trenton, or credit card/e-check through the posted MSB payment link. 5. Obtain permit issuance and complete required inspections with the building inspector.
04 How do I schedule a building inspection in Trenton, WI? ▸
Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in Trenton, WI via: Contact permitting office.
last verified April 2026
source Town of Trenton Building Permit Information / Building Inspector ↗
entry id permits/wisconsin/washington/trenton-town
Educational reference. Permit rules and fees change — confirm current requirements directly with Town of Trenton Building Permit Information / Building Inspector before applying. Jaspector is not legal advice.