Planning a Seattle ADU · Confirm the lot and jurisdiction before choosing the plan
Seattle ADU planning guide

Terms for Using This Website

Last reviewed 6 August 2026. By using the website, you acknowledge the boundaries below.

Seattle ADU Construction is independently operated. It is not a City of Seattle, SDCI, King County, utility or Washington State service. It also does not itself supply architectural, engineering, legal, tax, real-estate or building work.

Educational purpose

Articles, checklists and examples support early research and company comparison. They are general and cannot account for every parcel, building, owner goal or rule change. Nothing on the website is expert advice for your project.

Check live rules directly with the responsible government office. Get qualified design, financial, contract or construction advice before acting.

No property or approval determination

Reading a page or sending the form does not confirm that an ADU is allowed, buildable, financeable or suitable at an address. Only the relevant bodies can issue approvals, and qualified parties must investigate physical conditions.

Timelines, market figures and cost examples are not promises. A company’s published range cannot replace a written project-specific scope and price.

Inquiries and independent companies

The form may be used to seek a planning response or possible introduction. Neither filing nor acknowledgement creates a building, design, brokerage, agency or advisory agreement with the website operator.

Where project details are referred, the receiving company is a distinct business. That company alone is responsible for its representations, eligibility, advice, quote, agreement, personnel, work and follow-up. The property owner decides whether to engage it and should independently complete registration, insurance, reference and contract checks.

No guaranteed service outcome

The site does not promise that an inquiry will receive a response, that a suitable company exists, that a company will accept the project or that any resulting quote will meet the owner’s rules. Website availability and content may also change without notice.

External links are supplied for research convenience. The linked organizations control their own content, availability, security, terms and privacy. A link is not an endorsement or a warranty that the destination remains accurate.

Responsible use

You must not interfere with site operation, test security without authorization, submit unlawful or deceptive content, impersonate another person, automate abusive requests or use the form to transmit malware or confidential data you lack permit office to share.

You are responsible for the accuracy and lawfulness of the details you submit. Do not include sensitive credentials or records that are unnecessary for initial project routing.

Intellectual property

The site’s original wording, layout and compilation are protected to the extent provided by law. You may use the public material for personal project research and may share links. Republishing substantial portions, presenting the material as another service’s work or using automated extraction for a competing content library requires permission unless applicable law allows it.

Government documents and third-party marks remain the site of their respective owners.

Limits and applicable law

To the maximum extent allowed by applicable law, the website is provided without a guarantee of completeness, uninterrupted availability or fitness for a particular project. Nothing in these terms excludes rights or liabilities that cannot lawfully be excluded.

Any dispute concerning use of this independently operated website is subject to the law that properly applies to the operator and circumstances. Project disputes with a referred company are governed by that company’s different agreement and applicable law.

Changes to these terms

The terms may be updated when website functions or operations change. Continued use after an update is governed by the version then displayed, subject to any rights that cannot be varied this way.

Frequently asked questions

Does a form response amount to a quote?

No. A quotation would need to come from an independent company after enough project review and would be governed by its own conditions.

Can the guides replace an SDCI answer?

No. They help organize questions. Current official guidance and site-specific review control the approval process.

Does this website recommend that I hire the first introduced company?

No. Owners remain responsible for comparison and due diligence and may decline any introduction.

Treat the site as a planning aid, check every site-specific issue and put all expert and building commitments in separate written agreements.

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Independent provider notice: Independent planning and referral website. It is not a contractor or government agency. Provider availability varies by address and project. The provider you choose controls assessment, credentials, design, permits, price, contract, construction and follow-up. The website may receive compensation when an introduction produces business.