Ann Arbor ADU Energy & Insulation Permits

Housing and Building Standards Michigan 4 Minutes Read · published March 01, 2026 Flag of Michigan

In Ann Arbor, Michigan many accessory dwelling unit (ADU) projects that add living space or modify building envelope for energy efficiency require local permits and must meet state and local building and energy codes. This article explains who enforces ADU permit and insulation requirements, how to apply, what inspections cover, common violations, and where to find official forms and contacts. It summarizes current official sources and notes when specific penalty amounts or R-value numbers are not published on city pages.[1]

Start permit planning early to avoid delays and extra costs.

Overview of legal authority

The legal authority for ADU siting, construction permits and enforcement in Ann Arbor derives from the City of Ann Arbor Code of Ordinances and the City departments that implement building and zoning rules. Local zoning and code provisions are consolidated in the municipal code and the Planning & Development and Building Safety offices publish guidance for ADUs and permits.[1] For practical ADU guidance from the city, see the Planning ADU information page.[2]

Permits and energy/insulation requirements

Typical ADU changes that trigger permits include new habitable space, insulation upgrades that affect the building envelope, mechanical or ductwork changes, and altered means of egress. Projects must comply with applicable residential building and energy codes adopted by the city and enforced at permit issuance and inspection.

  • Apply for a building permit for structural or envelope work.
  • Mechanical and electrical modifications commonly require trade permits and licensed contractors.
  • Insulation, vapor barrier and air-sealing are inspected during rough and final inspections.
  • Energy compliance documentation (compliance forms, worksheets or certificates) may be required at plan review.

Applications & Forms

The city publishes permit application procedures and permit fee schedules through the Building Safety office. Specific form names and numbers for energy compliance or insulation worksheets are provided on the Building Permits and Inspections pages; if a particular form number or fee is not listed on the cited page, it is "not specified on the cited page" and applicants should contact Building Safety for the current form and fee information.[3]

Penalties & Enforcement

Enforcement is handled by City of Ann Arbor enforcement units including Planning & Development Services and the Building Safety division; these offices issue stop-work orders, require corrective permits, and can refer violations for civil action. The municipal code describes enforcement authority and penalties for violations of building, zoning and related code provisions.[1]

Fine amounts and daily penalties are not specified on the cited page when specific sums are not published; where exact fines, escalating penalties for repeat or continuing offences, or statutory maximums appear in the municipal code they should be cited directly from that code. If a page lacks numeric fines, the correct statement is: "not specified on the cited page."

  • Monetary fines: not specified on the cited page.
  • Escalation for repeat or continuing violations: not specified on the cited page.
  • Non-monetary sanctions: stop-work orders, required corrective permits, injunctive or civil actions, and court enforcement are authorized under the municipal code.[1]
  • Enforcer and complaint pathway: Planning & Development Services and Building Safety; see official contacts and permit pages for how to report or request inspection.[3]
  • Appeals and review: appeal routes are governed by the municipal code and administrative rules; time limits for appeals should be confirmed on the municipal code or with the department because specific deadlines are not always summarized on guidance pages ("not specified on the cited page").[1]

Common violations

  • Working without a required building permit — often leads to corrective permit and possible fines.
  • Improper or non-inspected mechanical or electrical work — requires rework and inspection sign-off.
  • Insulation or air-sealing not meeting code documentation — may require removal or additional work and re-inspection.
If you receive a stop-work order, contact Building Safety immediately to learn appeal and remediation steps.

Action steps

  • Determine if your ADU work requires a permit by consulting Planning & Development and Building Safety pages.[2]
  • Prepare plans that show insulation, air-sealing, and energy compliance details for plan review.
  • Submit permit application, attach energy compliance forms if required, and pay fees as shown on the Building Permits page.[3]
  • Schedule required inspections (rough, insulation, final) and address any correction notices.
  • If you disagree with a notice or penalty, follow the municipal code appeal process and file within the specified time limit given by the enforcing department or code text.[1]

FAQ

Do I need a permit to build or convert an ADU in Ann Arbor?
Most new ADUs or conversions that create habitable space, modify insulation, structure or mechanical systems require a building permit; confirm specifics with Planning & Development Services and Building Safety.[2]
What energy or insulation standards apply?
ADU projects must comply with adopted residential energy and building codes enforced at plan review and inspection; exact R-values or prescriptive measures should be confirmed via Building Safety guidance or the applicable code text (not always listed on guidance pages).[3]
What happens if I do work without a permit?
Enforcement can include stop-work orders, corrective permits, fines or court action; the municipal code sets enforcement authority while numeric fine amounts may be published in the code or may be not specified on the cited guidance pages.[1]

How-To

  1. Confirm whether your ADU scope triggers permits by consulting the city ADU and permit pages.[2]
  2. Prepare and submit plans documenting structural changes, insulation, and energy compliance measures.
  3. Complete and submit the building permit application and any energy compliance worksheets via Building Safety; pay required fees.[3]
  4. Schedule inspections at designated milestones (rough, insulation/air barrier, final) and correct any noted deficiencies.
  5. If enforcement action occurs, review the municipal code remedies and deadlines and file appeals where applicable.[1]

Key Takeaways

  • Plan ADU insulation and energy compliance into permit drawings to avoid rework.
  • Contact Building Safety early to confirm required forms and fees.
  • Enforcement can include stop-work orders and corrective requirements even when monetary fines are not clearly listed on guidance pages.

Help and Support / Resources

  1. [1] City of Ann Arbor - Code of Ordinances (municipal code)
  2. [2] City of Ann Arbor - Accessory Dwelling Units (Planning guidance)
  3. [3] City of Ann Arbor - Building Permits & Inspections

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