Skip to content

Process Cost Tools Permits Builders Types Floor plans Homes with ADU Compare Guides

Get the playbook

The 2026 ADU Homeowner's Playbook, free.

A 27-page PDF covering process, costs, permits, and financing — plus monthly updates on what's changing in state ADU law.

By submitting, you consent to OwnAdu and up to three vetted ADU builders contacting you by email about your project. Consent is not a condition of purchase. Unsubscribe at any time via the link in any email. See our Privacy and Terms.

Independent guidance for U.S. homeowners building Accessory Dwelling Units.

The ADU process

Overview
Planning
Design
Permits
Financing
Construction
Inspection & occupancy

Tools & calculators

Cost calculator
ROI calculator
Loan calculator
Feasibility check

Plan & compare

ADU cost
ADU types
Floor plans
Financing options
Permits by city
Compare ADUs

Find builders & homes

Builder directory
Homes with ADU
Buying guide
For builders

Company

About
Contact
Privacy
Terms

© 2026 OwnAdu. All rights reserved.

OwnAdu is an independent educational resource. We may earn a referral fee when homeowners connect with builders. This never affects our editorial content or builder vetting.

Help us improve the site?

We use anonymous, cookieless analytics by default. With your consent we also use Microsoft Clarity for session insights to fix usability issues. You can change this any time on our Privacy page or via the "Do Not Sell or Share My Personal Information" link in the footer.

ADU builder · California

Diamond ADU Builders

Unclaimed listing

San Diego ADU contractor specializing in design and construction of custom and prefab ADUs.

Services

Custom ADU
Prefab ADU

Service area

San Diego

This listing is unclaimed

We sourced this entry from public business directories. If you own this business, claim this listing to receive leads directly. Until then, lead requests will be held while we contact verified builders in the area.

Request a quote

We'll route your request to verified builders serving your area.

Get matched with 2–3 vetted ADU builders

Tell us a bit about your project. We'll connect you with builders who actually serve your area and your budget.

Email

ZIP

First name (optional)

Estimated sq ft (optional)

Project stage

Estimated budget

Timeline

ADU type interest

By submitting, you consent to OwnAdu and up to three matched builders contacting you by email or phone about your project. Consent is not a condition of purchase. Reply STOP to opt out at any time.

Builder's website

sandiegoadu.org/

Listing sourced from public business directories. Not affiliated with OwnAdu. To request removal, contact us.