ADU and casita drafting
A casita is a small house, and the set has to treat it like one: site plan, floor plan, elevations, sections, and the structural, electrical, and plumbing sheets the city expects. Before any line is drawn, the lot gets vetted against what your city allows today: setbacks, easements, lot coverage. Today matters, because these rules change more often than people think, and we track them city by city.
What you get
Existing conditions
A dimensioned plan of the lot and the primary residence, measured on site rather than traced off a listing.
Site plan
Unit placement with setbacks, easements, lot coverage, and the utility routes the plan checker will look for.
Floor plans and elevations
The unit drawn at permit scale: dimensioned plans, all four elevations, door and window schedules.
Sections and details
Wall sections, foundation and roof details, and the assemblies your framer prices from.
Code sheet
The residential code path for your jurisdiction, laid out on the sheet the reviewer expects.
Corrections handled
If the plan reviewer sends redlines, the set gets revised until it is approved.
Who this is for
Homeowners
You want a rental unit, a guest suite, or a place for family on the lot you already own. We tell you what will actually fit, then draw a set your contractor can build from and your city will accept.
Builders and remodelers
You need ADU sets turned around inside the bid window, in your standards. Sheet naming and title blocks match your existing set, and corrections come back to us.
Before you start
Can I put an ADU on my lot?
It depends on the city, not just the lot. In Arizona, state law requires cities over 75,000 people to allow at least one attached and one detached unit on most single family lots, but four cities we work in are below that line and set their own rules. In Oregon, every city we serve allows at least one. The lot itself still has to clear setbacks, easements, and coverage. Send the address and we will check it against the current code. Our city pages list the rules and their sources.
How big can the unit be?
Most Arizona cities cap it at 75 percent of the house or 1,000 square feet, whichever is less, but the exceptions matter: Buckeye has no square footage cap, Flagstaff allows 800 square feet no matter how small the house is, and Prescott counts every accessory building on the lot toward one total. Oregon runs from 750 to 1,000 square feet depending on the city. The comparison table on each state page shows them side by side.
Related projects
Have a project in mind?
Email or call. setashabybee@enchantmentdesign.com · (480) 206-4879