For ADU builders, prefab companies, and plan vendors

Homeowners use this site when they are trying to understand who to call, what a quote includes, whether prefab makes sense, and which companies are actually relevant for their city and lot.

That makes the site useful for ADU builders, prefab ADU companies, modular manufacturers, preapproved plan vendors, architects, and design-build firms that want to be discovered by homeowners before the quote list is already closed.

Visibility options

The fastest way to start is to send a short, source-backed company packet. From there, the right path is usually one of four options.

Who this is for

This page is for companies that serve Bay Area homeowners considering an ADU: local ADU builders, general contractors, design-build firms, prefab ADU brands, modular manufacturers, factory-built housing companies, preapproved plan vendors, architects, and installer partners.

Prefab and modular companies should be especially clear about what they sell. A homeowner needs to know whether the company provides a full turnkey project, a manufactured unit, a plan set, a dealer relationship, or a product that still needs a local contractor.

What we need from prefab and modular companies

For US-made, California-made, overseas-made, or hybrid prefab ADU products, send details that help a Bay Area homeowner understand whether the product can realistically be used here.

• Manufacturing country, state, and factory location.
• Bay Area cities or counties served.
• California HCD, factory-built housing, or local permit path.
• Whether the price is unit-only, installed, or turnkey.
• Who handles foundation, utilities, delivery, crane or access planning, and permits.
• Whether a local licensed contractor or installer is required.
• Finished project examples, not only renderings.
• Warranty, service, and post-installation responsibility.

Editorial standards and paid visibility

ADU Bay Area Guide is independent. Paid visibility is available only when it is clearly labeled. It does not guarantee an editorial recommendation, ranking, or homeowner match.

The strongest company profiles are specific: real service areas, real finished projects, clear permit responsibility, plain-English exclusions, and evidence that the company can work with Bay Area site conditions.

What to send first

Keep the first email practical. The goal is to verify fit quickly, not to send a long pitch deck.

• Company name, website, and preferred contact person.
• Bay Area cities or counties served.
• License, entity, HCD, factory-built housing, or code-path details.
• Three finished project links or photos, preferably local.
• Whether you sell design-build, construction, plans, units, installation, or turnkey.
• What price usually excludes: permits, utilities, foundation, delivery, or site work.
• Which page you want corrected, reviewed, or sponsored.

Where companies may appear

Current research areas include the San Jose ADU builder guide, the San Jose ADU builder finder, the San Jose builder search landscape, the Bay Area builder search landscape, the Bay Area company research hub, the Bay Area prefab ADU company guide, and the Bay Area prefab ADU manufacturer guide.

If you are specifically asking about paid placement or category sponsorship, start with the ADU Bay Area Guide advertising page.

If you mainly want to send source-backed company details for review or correction, use the ADU company submission page.