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Structures and site guide

Plan an accessory dwelling unit from the site inward

Coordinate local permission, access, privacy, utilities, parking, fire response, and a compact room program.

Created 2026-08-02Author: not yet recordedQualified reviewer: not yet suppliedSubstantive review date: pending

Direct answer

Before drawing an ADU, confirm whether the project type is allowed and map setbacks, easements, access, utilities, hazards, parking, height, and existing structures. Then test a compact plan against privacy and long-term use.

Planning workflow

  1. Identify the jurisdiction and obtain current zoning, building, utility, and fire information.
  2. Map the parcel, existing building, easements, setbacks, trees, drainage, and service routes.
  3. Compare attached, detached, conversion, and internal concepts where legally available.
  4. Develop a room program and request planning, design, utility, and permit review.

Formula or decision logic

Usable concept area begins with the surveyed parcel minus verified no-build constraints; it is not parcel area minus generic setbacks. Eliminate concepts that cannot achieve lawful access, utilities, safety, or required separation. Compare remaining options on privacy, accessibility, construction disruption, and life-cycle use.

Worked planning example

A rear-yard rectangle appears to fit a 24 by 30 ft ADU, but a recorded utility easement crosses one side and fire access is unresolved. The editor keeps both zones visible and marks the footprint provisional rather than shrinking an assumed setback until it appears to fit.

Open this starting state in AtriBuildUse the related calculatorReview Detached ADU concept

Limitations and review boundary

  • ADU rules can change and differ by jurisdiction and parcel.
  • A map sketch is not a survey or title report.
  • Utility capacity, fire access, structure, energy, and permits need local professional confirmation.
Conceptual planning onlyAtriBuild does not provide architectural or engineering services, stamped plans, permit approval, code-compliance verification, contractor bids, or construction guarantees. Verify dimensions, assemblies, utilities, quantities, prices, permits, and safety decisions with qualified local professionals.

Primary sources

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