Add a separate home beside the one you own

Attached ADU construction in Anaheim

An attached ADU shares a physical connection with the main house while functioning as its own dwelling. The new rooms have to work for their occupants and the tie-in has to work for the existing building.

Anaheim information checked September 7, 2026. Check the agency links again after the design direction and address are known.

Call (714) 410-2706

01

The connection drives the construction plan

We look at the wall or area where the addition may connect, then consider foundation elevations, roof drainage, framing direction, shear walls, existing openings, utilities, and waterproofing.

Moving a proposed addition a few feet can change excavation, windows, interior circulation, and the amount of the existing home that must be opened. Those effects should be studied before pricing.

02

Plan two households around one building

The entry, windows, patios, parking path, mechanical equipment, and trash access affect both homes. A good plan considers sound and sight lines as carefully as room sizes.

Inside, storage, laundry, kitchen work zones, bathroom access, and furniture clearances should be tested against the intended occupants.

03

Do not assume shared walls mean simple utilities

The design team still needs to determine electrical loads, water and sewer routing, ventilation, heating and cooling, fire and sound assemblies, and energy compliance. Existing systems may or may not have useful capacity.

The proposal should identify work inside the primary home, temporary protection, and restoration where new lines or structural connections pass through finished areas.

04

Attached ADUs use the standard Anaheim review path

Anaheim’s ADU Express program is described for eligible detached plans. Attached projects are prepared for the City’s standard process with property-specific drawings and supporting documents.

Use the current City checklist and code for the submission. We coordinate construction questions; City reviewers and design professionals make their own determinations.

City and state references

Agency documents to keep with the plans

Read the source material beside the latest site plan and note any question that needs an agency answer.

Continue from here

Review the connected project decisions

Bring us the property

Review the property with our team

Explain what you hope to build and what has already been measured, inspected, or discussed with the City.

Call (714) 410-2706 · Anaheim ADU Builder home