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Plan Commission approves detached mother‑in‑law suite for Manacci property

Village of Germantown Plan Commission · March 10, 2026
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Summary

The commission approved a conditional use permit allowing a detached conversion/expansion of a garage into a mother‑in‑law suite at W 213 N 11111 Appleton Avenue, finding no adverse impacts and waiving certain code requirements through the CUP process.

The Village of Germantown Plan Commission approved a conditional use permit for Peter and Donna Manacci to convert and expand an existing detached accessory garage into a detached mother‑in‑law suite (ADU) at W 213 N 11111 Appleton Avenue.

Staff explained the zoning code generally allows mother‑in‑law suites contained within the principal dwelling under section 17.0864, but this proposal is detached and therefore required CUP relief for several code criteria. The property is 6.5 acres in RS‑1 single‑family residential zoning and staff concluded the proposed detached ADU would not create adverse impacts for the surrounding area given the parcel size and physical constraints — and that the project is the most feasible option for the family’s needs.

No members of the public testified for or against the application at the public hearing. Commissioners asked technical questions about building plans, utilities, and required county well and septic approvals; staff and the applicants confirmed all required building permits and county approvals would be obtained and that the converted unit must comply with the state Uniform Dwelling Code and Washington County well/septic rules.

The commission voted to approve the CUP with the conditions listed in the staff report; staff will issue building permits after the required environmental and utility approvals are submitted to inspection services.