Before a Wayne County addition estimate becomes a work order, place the proposed footprint on the same drawing as the existing home, other structures, septic system, replacement area when applicable, and water well. Then obtain the Health Department response and any separate septic or plumbing permits before treating the Construction Application for Permit, or CAP, as complete.

That order matters because the current County instructions name occupied-building foundation extensions—such as a bedroom, living room, attached garage, or shop—as projects the Health Department reviews. They also say additional plumbing fixtures require a Health Department plumbing permit (current CAP instructions). A builder’s drawing can supply inputs, but it is not the government’s response.

The County route is an office chain, not one permit

Wayne County’s public permit page presents an eight-step route beginning with Building Codes, then moving through address, Soil & Water, Health, Planning, County Engineer, final CAP signature, and return to Building Codes (County permit route). Not every office will control every project, but one signature should never be described as approval by all of them.

The March 24, 2026 CAP form makes those boundaries visible. It has distinct project and parcel fields, septic/private-water questions, variance material, and separate agency signoff blocks (current CAP form). Save the completed version and each attached determination; do not retain only the cover sheet.

Build the seven-record addition file

1. Parcel and proposed scope

Record the site address, parcel number, township or municipality, existing use, proposed rooms or attached space, foundation change, added fixtures, and estimated disturbed area. Keep observed facts separate from assumptions about which office controls the project.

2. Relationship drawing

Show and label:

  • the proposed addition or alteration;
  • the existing home and other structures;
  • property and right-of-way context available from the current record;
  • the septic tank, treatment components, and leach field;
  • the replacement leach field, if applicable; and
  • the water well.

Add dimensions between the proposed work and the mapped features. Label the drawing “submitted” until the responsible office accepts it. This is a coordination record, not a septic design or boundary survey merely because it carries measurements.

3. Health Department CAP response

Preserve the submitted drawing, questions asked, corrections, written response, and dated CAP signoff or waiver. The instructions list detached garages, storage buildings, porches, and linear construction as examples normally waived from Health CAP review, but they also reserve follow-up authority. Do not apply a waiver example without an office response for the actual scope.

4. Septic design and permit, when required

Wayne County Health separates site evaluation, final design review, an installation or alteration permit, installation inspection, as-built or start-up evidence, approval for use, and a later operating record (Health Department sewage process). A CAP signature is not a substitute for that sequence.

If the project changes use, load, footprint, or access around the sewage system, ask the Health Department which existing record and new review it needs. Do not ask a construction bidder to declare capacity or soil suitability unless that conclusion comes from the responsible qualified and government-reviewed process.

5. Plumbing permit, when required

List every added, relocated, or altered fixture in the scope. The Health Department says a plumbing permit is required before covered installation or alteration and describes applications by a registered contractor or a resident homeowner under its rules (plumbing permit page). Preserve the permit, responsible installer, inspection requests, corrections, and final result separately from the building record.

6. Signed CAP and building record

Keep every office signature, waiver, condition, attachment, fee receipt, building application, issued permit, plan set, and revision. Compare the issued scope to the estimate before starting. A submitted CAP or payment receipt is not an issued building authorization.

7. Inspections and closeout

Retain inspection requests and results for the building, plumbing, septic, and any other required work. Add accepted as-built material, final approvals, and the Health Department’s later operating record when the sewage process requires it. Do not collapse these into a contractor’s “job complete” invoice.

Put these boundaries in the estimate

Ask the estimate to name:

  1. the jurisdiction and parcel record used;
  2. who produces and revises the relationship drawing;
  3. who obtains each Health, CAP, zoning, building, plumbing, well, floodplain, road, and Soil & Water response;
  4. whether septic design or alteration is included, excluded, or still unknown;
  5. which inspections must occur before work is covered; and
  6. the public record that marks each scope complete.

A lower construction price may simply omit a review, design, excavation, restoration, or closeout responsibility. Compare the records and exclusions before comparing totals.

Source and methodology

Local Service Ledger compared the current Wayne County permit route, CAP instructions, March 2026 form, Health Department sewage process, and plumbing page on August 3, 2026. We aligned them into seven evidence stages. We did not inspect a property, evaluate a sewage system or drawing, calculate capacity or setbacks, determine jurisdiction, or ask an office to approve a hypothetical addition.