County Permit SearchU.S. compliance directory
← Washtenaw County overview

Codes, exemptions & field inspections

Build to the adopted code. Verify every exception.

This guide translates the available agency record into a preconstruction checklist for structural scope, minor work, and inspection release. The adopted code and the issuing official control when a field condition is disputed.

Regulatory framework

The code baseline for Washtenaw County.

Washtenaw County Building Inspection provides county enforcement of Michigan's State Construction Code for building, electrical, mechanical, and plumbing systems in the county jurisdictions it serves. The current Michigan framework includes the 2021 Michigan Building Code, 2015 Michigan Residential Code for one- and two-family dwellings while the proposed 2021 residential update is stayed, 2021 Michigan Mechanical and Plumbing Codes, 2023 National Electrical Code with Michigan amendments, and current Michigan energy and rehabilitation provisions. Local zoning approval and other agency approvals may also be required before issuance.

Inspection lane

Schedule required building, electrical, mechanical, and plumbing inspections through the county's automated inspection system at (866) 458-7358, available 24 hours a day, or through the permit portal. Provide the permit number and job address, keep work accessible and uncovered until approval, and request inspections as construction progresses. The county's current trade application instructs applicants to give advance notice and states that a visible permit number is required.

Minor-work playbook

Understand what may be exempt—and what is not.

The county's applications identify limited plan-review exceptions rather than a single cosmetic-work list. Examples include certain small electrical systems, minor mechanical alterations as determined by the official, and specified one- and two-family mechanical work; no work may be concealed before inspection. Confirm whether ordinary repairs, reroofing, siding, decks, pools, or accessory structures require a permit before starting.

Field rule

A permit exemption generally addresses one narrow construction trigger. It does not automatically waive zoning, land-use, floodplain, shoreline, fire, energy, electrical, utility, septic, or right-of-way requirements. Obtain written confirmation when the project involves a new structure, structural alteration, change in occupancy, or concealed work.

Inspection pipeline

Keep the work visible at every release point.

  1. 1

    Request with lead time

    Schedule required building, electrical, mechanical, and plumbing inspections through the county's automated inspection system at (866) 458-7358, available 24 hours a day, or through the permit portal. Provide the permit number and job address, keep work accessible and uncovered until approval, and request inspections as construction progresses. The county's current trade application instructs applicants to give advance notice and states that a visible permit number is required.

  2. 2

    Preserve access

    Do not cover framing, reinforcement, wiring, piping, damp-proofing, or life-safety work until the required inspection has been completed and documented.

  3. 3

    Close the record

    Retain the approved plans, inspection approvals, correction responses, and final certificate or occupancy release with the property file.

Contractor verification

Verify the builder before the contract is signed.

Use the state licensing system to verify active registration, trade credentials, bond status, and liability coverage where available. Match the legal business name to the proposal and permit application.

Verify contractor ↗

Planning reference

Keep the parcel rules beside the building plans.

A building permit is only one part of statutory compliance. Check the local zoning, ordinance, map, or land-use reference before finalizing setbacks, height, lot coverage, access, drainage, or accessory structure placement.

No verified planning reference link is listed; ask the agency for the parcel-specific source.

Source trail

Official sources for this profile

Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.

Agency websiteOpen official source ↗Permit portalOpen official source ↗Application instructionsOpen official source ↗Fee scheduleOpen official source ↗Contractor license lookupOpen official source ↗

Project questions

Frequently asked questions for Washtenaw County

Who handles permitting for this jurisdiction?

Washtenaw County Building Inspection Department is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.

How should I begin an application?

Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact (734) 222-3900; automated inspection line (866) 458-7358.

How long might review take?

N/A; no fixed plan-review turnaround was published. Plans must be submitted and approved before a permit is issued, and the application must include required zoning, health, soil-erosion, and other applicable approvals.

How are inspections scheduled?

Schedule required building, electrical, mechanical, and plumbing inspections through the county's automated inspection system at (866) 458-7358, available 24 hours a day, or through the permit portal. Provide the permit number and job address, keep work accessible and uncovered until approval, and request inspections as construction progresses. The county's current trade application instructs applicants to give advance notice and states that a visible permit number is required.

Which codes and exemptions should I review?

Washtenaw County Building Inspection provides county enforcement of Michigan's State Construction Code for building, electrical, mechanical, and plumbing systems in the county jurisdictions it serves. The current Michigan framework includes the 2021 Michigan Building Code, 2015 Michigan Residential Code for one- and two-family dwellings while the proposed 2021 residential update is stayed, 2021 Michigan Mechanical and Plumbing Codes, 2023 National Electrical Code with Michigan amendments, and current Michigan energy and rehabilitation provisions. Local zoning approval and other agency approvals may also be required before issuance. The county's applications identify limited plan-review exceptions rather than a single cosmetic-work list. Examples include certain small electrical systems, minor mechanical alterations as determined by the official, and specified one- and two-family mechanical work; no work may be concealed before inspection. Confirm whether ordinary repairs, reroofing, siding, decks, pools, or accessory structures require a permit before starting.

Field sequencing matters

The inspector needs to see the work at the right moment.

Code compliance is not only a plan-review exercise. Footings, reinforcement, framing, fireblocking, wiring, piping, insulation, weather protection, and life-safety systems each have points where the work must remain accessible. Build the inspection calendar into the trade schedule instead of treating it as a final administrative step.

When a project qualifies for a narrow minor-work exemption, keep a written explanation of why it qualifies and confirm that related zoning, utility, fire, energy, or environmental rules do not create a separate approval requirement.

Closeout file

Keep the approved plan set, inspection approvals, correction responses, contractor license verification, final certificate, and any occupancy release together. A clean record protects the owner, builder, lender, insurer, and future buyer.