Custom ADU builders
in Phoenix.

Before choosing a floor plan, identify the parcel and confirm that the property is within City of Phoenix jurisdiction. The city’s ADU guidance directs owners to its zoning map, lot-coverage information, and Planning and Development staff. A Phoenix mailing address is a starting point for that investigation, not a substitute for a parcel review.

Make a measured inventory of the house, covered patios, garage, pool, walls, and other improvements. Mark which parts of the yard you want to keep. This gives the design a useful boundary: the ADU should add a good place to live while preserving the circulation and outdoor uses that already work.

On an established lot, the path from the street to the ADU often deserves as much attention as the interior. Think through grocery bags, a visitor arriving after dark, and the person who wants to enter without crossing the main home’s patio. An existing side gate may help with pedestrian access; construction equipment and deliveries need a separate access discussion.

Place the entrance, outdoor seating, and primary windows together on the site plan. A courtyard can give both households a comfortable outdoor area. A long, narrow passage may call for a different entry position even when the building footprint fits.

Phoenix maintains an ADU Standard Plan Library. Its published instructions say a plot or site plan is still required, and changes to an approved standard design move outside that standard-plan process. The page also identifies designs still in review. Check the availability of the particular plan before building a schedule around it.

Compare a standard design with a custom concept using the same questions: Does the entry face the right direction? Is furniture placement comfortable? Where do the utilities connect? A familiar plan can provide a useful starting point, while the property determines how practical that starting point will be.

Gather any existing survey, recorded site plan, electrical information, and sewer or septic records you have. Photograph the proposed build area and the path to it. Ask the project team to identify likely utility routes and work areas before those decisions become assumptions in the budget.

Include the restoration work in the conversation: gates, wall sections, paving, irrigation, and landscape disturbed by construction. A complete scope explains how the ADU is reached and connected, as well as what happens inside the new walls.

Tell us who will use the home, the rooms that matter, and what you value in the current backyard. Bring a few photographs of your existing architecture and one or two examples you like. We can then discuss a design direction with a clear list of property questions to resolve.