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.

Claim your listing — Flaherty Contracting | OwnAdu

Claim your listing

Flaherty Contracting

Listing currently: Unclaimed

To claim this listing, sign in with your business email. We'll auto-verify your claim if your email domain matches your listing's website (flahertycontracting.com).

Your business email

We'll send you a one-time sign-in link. Your email domain must match the listing's website for auto-verification.

OwnAdu uses a one-time magic link instead of a password. Your business email is the only credential we keep.