Join California's Largest ADU Vendor Network
GatherADU connects qualified contractors, ADU companies, modular builders, prefab manufacturers, architects, engineers, and specialty trades with thousands of homeowners ready to build. Grow your business with a steady pipeline of pre-qualified ADU projects.
The ADU Market Is Booming. Are You Getting Your Share?
California's ADU market has exploded since the passage of landmark legislation in 2017, 2020, and 2024. Permit applications have grown over 400% statewide, with tens of thousands of new ADUs approved every year across Los Angeles County alone. Yet many qualified contractors, builders, and ADU professionals are missing out on this massive opportunity because homeowners don't know they exist.
That's where GatherADU comes in. As California's leading ADU resource platform, we connect homeowners who are ready to build with the professionals who can make it happen. Our vendor network is the bridge between qualified demand and qualified supply. When you join the GatherADU Vendor Network, you gain access to a curated pipeline of homeowners who have already decided to build an ADU and are actively looking for the right professional partner.
We're not a lead generation service that sells the same lead to ten different companies. We're a trusted ecosystem where homeowners come to learn, plan, and ultimately build their ADUs. Our editorial team publishes over 1,300 educational articles, our city guide database covers 1,125+ municipalities, and our floor plan library features hundreds of ready-to-build designs. This means the homeowners who reach our vendor directory are already informed, motivated, and ready to make hiring decisions.
ADU Professionals We're Looking For
We partner with a wide range of construction and design professionals across the entire ADU value chain. If you work in residential construction or related services, there's a place for you in our network.
General Contractors
Licensed general contractors experienced in residential construction, home additions, and ADU-specific building. Whether you specialize in ground-up construction, garage conversions, or attached ADU additions, our homeowner base needs your expertise. General contractors represent the backbone of any ADU project, managing everything from foundation work and framing to final inspections and certificate of occupancy.
We're particularly interested in contractors who hold active Class B licenses in California, maintain workers' compensation and general liability insurance, and have completed at least three ADU projects. Experience with local building departments, familiarity with Title 24 energy compliance requirements, and a track record of passing inspections on the first attempt are highly valued by the homeowners in our network.
ADU Specialist Companies
Full-service ADU companies that handle the entire process from design through construction completion. Many homeowners prefer working with a single company that manages every aspect of their ADU project, including architectural design, engineering, permit applications, construction management, and final city inspections. If your company operates as a turnkey ADU builder, you are exactly the type of partner our homeowners are searching for.
ADU specialist companies often have the advantage of streamlined processes, pre-approved plan sets for common configurations, and established relationships with building departments across multiple jurisdictions. We welcome companies that offer both custom ADU designs and standardized floor plans, as our homeowner audience spans the full spectrum from budget-conscious garage conversions to high-end detached units with premium finishes.
Modular and Prefab ADU Manufacturers
Factory-built and modular ADU companies that manufacture units off-site for delivery and installation. The modular and prefab ADU segment is one of the fastest-growing sectors in California's housing market, offering homeowners the appeal of shorter construction timelines, controlled factory environments that minimize weather delays, and often more predictable pricing than traditional site-built construction.
We partner with modular builders using a variety of construction methods including panelized systems, volumetric modules, shipping container conversions, steel frame systems, and structural insulated panel (SIP) construction. Whether your company manufactures ADUs locally in Southern California, ships from a factory in another state, or produces flat-pack kits for on-site assembly, our platform gives you direct access to homeowners who are specifically researching prefab and modular options for their properties.
Our content library includes dozens of articles comparing modular vs. site-built ADUs, reviewing specific prefab manufacturers, and explaining the permitting nuances unique to factory-built housing. This means homeowners who find your listing through our network already understand the modular construction process and are genuinely interested in your product, not just tire-kicking.
Architects and Designers
Licensed architects and residential designers who create ADU plans, floor plans, and construction documents. Architectural design is typically the first professional service a homeowner needs when starting an ADU project, making architects one of the most in-demand categories in our vendor network. We connect homeowners with architects who specialize in small-space design, efficient floor plans, and navigating the specific zoning and setback requirements that govern ADU construction in California.
We're looking for architects who can provide everything from preliminary feasibility assessments and site analysis to full construction document sets ready for permit submission. Experience with ADU-specific design challenges such as maximizing livable space within 1,200 square foot limits, designing for aging-in-place accessibility, and incorporating sustainable features like solar panels and EV charging is particularly valuable to our homeowner audience.
Structural Engineers
Licensed structural engineers who provide foundation design, structural calculations, and engineering reports for ADU projects. Every ADU project in California requires structural engineering, whether it's a simple garage conversion that needs new header calculations and foundation assessment, or a complex two-story detached unit requiring complete structural design from footings to roof framing.
Structural engineers in our network handle soil reports and geotechnical assessments, foundation design for new construction, structural retrofit calculations for garage conversions, lateral force analysis for hillside properties, seismic compliance, and Title 24 energy calculations. We especially value engineers who offer fast turnaround times and competitive pricing, as engineering costs and timelines are frequently cited by homeowners as one of the most frustrating aspects of the ADU permitting process.
Specialty Subcontractors
Licensed specialty subcontractors including electricians, plumbers, HVAC technicians, roofers, concrete contractors, landscapers, and other trade-specific professionals who contribute to ADU construction. While many homeowners hire a general contractor to manage their entire ADU project, a growing number of owner-builders and savvy homeowners are sourcing individual subcontractors directly, particularly for specific phases of construction or for finishing work after the shell is complete.
We welcome all licensed specialty trades that serve the ADU construction process. This includes but is not limited to: licensed electricians (C-10) who handle panel upgrades, new circuits, and ADU electrical rough and finish; licensed plumbers (C-36) who manage sewer connections, water supply lines, and fixture installation; HVAC professionals (C-20) who design and install mini-split systems, ductless heating and cooling, and ventilation for Title 24 compliance; concrete and foundation contractors (C-8) who pour slabs, footings, and retaining walls; roofers (C-39) who install roofing systems on new ADU structures; and landscape contractors (C-27) who handle site preparation, grading, drainage, hardscape, and post-construction landscaping.
Title 24 Energy Consultants
Certified energy consultants and HERS raters who provide Title 24 energy compliance reports, CalGreen documentation, and energy modeling for ADU projects. California's building energy efficiency standards are among the strictest in the nation, and every ADU project requires Title 24 compliance documentation before a building permit can be issued. This creates steady, recurring demand for qualified energy consultants throughout the state.
We're looking for consultants who can provide comprehensive energy compliance packages including Title 24 Part 6 energy calculations, CF-1R compliance certificates, HERS rating and testing services, CalGreen checklists, solar-ready or solar-equipped design verification, and post-construction blower door and duct leakage testing. Fast turnaround on Title 24 reports is especially valued, as delays in energy compliance documentation are one of the most common bottlenecks in the ADU permitting timeline.
ADU Financing and Lending
ADU-specialized lenders, credit unions, and financing companies that offer construction loans, HELOCs, renovation loans, and other financing products tailored to ADU projects. Financing is consistently cited as one of the top three barriers preventing homeowners from moving forward with ADU construction, making ADU lending partners an essential part of our vendor ecosystem.
We welcome traditional banks, credit unions, fintech lenders, and private money lenders who offer products specifically designed for ADU construction. This includes home equity lines of credit (HELOCs), home equity loans, cash-out refinancing, FHA 203(k) renovation loans, construction-to-permanent loans, CalHFA ADU grant assistance, PACE financing for energy improvements, and specialized ADU loan products that consider projected rental income in their underwriting models. Our homeowner audience is actively seeking financing guidance, and featured lending partners receive significant visibility through our educational content ecosystem.
What You Get as a GatherADU Network Partner
Our vendor network is designed to deliver real, measurable business results. Here's exactly what you receive when you join.
Dedicated Vendor Profile Page
Every network partner receives a professional, SEO-optimized profile page on GatherADU.com that showcases your company, services, service area, credentials, project photos, and contact information. Your profile page is designed to rank in Google search results for your company name and local ADU-related keywords, giving you additional search visibility beyond your own website.
Your vendor profile includes your company description, logo, service categories, geographic service area, licensing information, customer reviews, project portfolio images, and direct contact links. We format each profile page with structured data markup so search engines can properly understand and index your business information, enhancing your visibility in local search results and Google's knowledge panels.
Pre-Qualified Lead Access
Unlike generic lead generation services that sell the same homeowner information to five or ten competing companies, our vendor network operates on a curated referral model. When homeowners contact us looking for a contractor, architect, or ADU specialist in a specific area, we match them with relevant network partners based on location, specialty, and availability. This means higher-quality introductions, lower competition per lead, and significantly better conversion rates compared to traditional lead services.
Our homeowners have already consumed extensive educational content on our platform before ever reaching out to a vendor. They understand ADU costs, timelines, permitting requirements, and design options. This means you're connecting with informed buyers who are past the research phase and actively ready to hire, not answering basic questions from people who are months away from making a decision.
Category and City Page Visibility
GatherADU operates one of the most comprehensive ADU city guide databases in the country, covering over 1,125 cities across California, Oregon, and Washington state. Our city pages rank prominently in Google search results for hundreds of location-specific ADU queries like "ADU builder in [city name]" and "ADU regulations in [city name]." As a network partner, your company is featured on the city pages that match your service area, placing you directly in front of homeowners searching for ADU professionals in specific locations.
In addition to city page placement, your company appears in category-specific vendor listings organized by service type. Homeowners browsing our vendor directory can filter by contractor type, service area, and specialty, making it easy for qualified prospects to discover your company when they're looking for exactly the type of service you provide. This targeted visibility delivers higher-intent traffic than generic online advertising.
Content Marketing and Brand Exposure
GatherADU publishes over 1,300 in-depth articles covering every aspect of ADU construction, permitting, design, financing, and regulations. Our content library generates tens of thousands of organic search visits every month from homeowners across California and beyond. As a network partner, you gain opportunities for featured mentions and backlinks within relevant editorial content, sponsor placement on high-traffic articles, and co-branded content opportunities that position your company as a thought leader in the ADU space.
Content marketing through our platform provides compounding returns over time. A single featured mention in one of our evergreen articles can generate awareness and leads for months or even years after publication, as our articles continue to rank in Google search results and attract new readers. This represents a fundamentally different value proposition compared to paid advertising, where visibility disappears the moment you stop spending.
GatherADU Verified Badge
Network partners who meet our quality standards receive the GatherADU Verified badge, a trust signal that appears on your vendor profile, in search results, and across all platform placements. Our verification process validates your licensing, insurance, project history, and customer satisfaction records, giving homeowners the confidence to reach out to your company knowing you've been vetted by a trusted third party.
The Verified badge has a measurable impact on homeowner engagement. Our internal data shows that verified vendors receive significantly more profile views, contact form submissions, and phone calls compared to non-verified listings. In a market where homeowners are increasingly cautious about contractor fraud and substandard work, the GatherADU Verified badge communicates legitimacy and professionalism before you ever speak with a prospect.
Network Collaboration and Referrals
The GatherADU Vendor Network isn't just about connecting with homeowners. It's also a professional community where ADU industry partners connect with each other. Architects refer their clients to trusted general contractors in the network. Contractors recommend reliable subcontractors. Lenders connect with builders whose clients need financing. This internal referral ecosystem creates additional business opportunities that compound over time as you build relationships within the network.
We facilitate cross-referrals through our partner directory, industry events, and quarterly network roundtables. Many of our most successful partners report that peer referrals from within the GatherADU network are among their highest-value lead sources, because these introductions come with an implicit endorsement from a fellow professional who has firsthand experience working with the referred company.
Joining the GatherADU Vendor Network
Our onboarding process is designed to be straightforward and fast. Most partners are fully listed within 5 business days.
Submit Your Application
Complete the partner application form below with your company information, licensing details, service area, and the types of ADU services you offer. Our team reviews every application personally to ensure quality standards are maintained across the network. The application takes approximately 10 minutes to complete and there is no application fee.
During the application, we'll ask about your licensing and insurance status, the types of ADU projects you've completed, your geographic service area, pricing ranges, company history, and any specializations or certifications that set you apart. The more detail you provide, the faster we can complete our review and get your profile live on the platform.
Verification and Onboarding
Our team verifies your licensing status through the California Contractors State License Board (CSLB) or relevant licensing authority, confirms your insurance coverage, and reviews your project portfolio and references. This verification process typically takes 2 to 3 business days and is what allows us to award the GatherADU Verified badge that builds homeowner trust in your company.
During onboarding, we'll also work with you to optimize your vendor profile for maximum visibility. This includes writing compelling company descriptions, selecting the right service categories and geographic tags, uploading high-quality project photos, and ensuring your contact information is accurate and prominently displayed. Think of it as getting your own professionally crafted landing page on one of California's highest-traffic ADU websites.
Go Live and Start Receiving Leads
Once your profile is live, you immediately begin appearing in our vendor directory, relevant city pages, and category listings. Homeowners can discover your company through organic search, browsing our vendor categories, or through direct referrals from our team when a homeowner contacts us with a project matching your specialty and service area. There are no setup fees and no long-term contracts. Our model is built on mutual success: we thrive when our partners thrive.
After your profile goes live, you'll have access to a partner dashboard where you can track profile views, lead inquiries, and engagement metrics. You can update your profile at any time to add new project photos, adjust your service area, update pricing, or highlight seasonal promotions. We also send monthly performance reports so you can measure the ROI of your network membership and identify opportunities to improve your profile's effectiveness.
What We Look For in Network Partners
We maintain high standards for our vendor network to protect homeowners and preserve the reputation of all partners in the network. Meeting these requirements isn't just about getting listed. It's about ensuring every homeowner who connects with a GatherADU partner has a positive experience that reflects well on the entire network.
Active Professional License
All contractors must hold a valid, active license issued by the California Contractors State License Board (CSLB) or equivalent licensing body in their state of operation. Architects must hold a current California Architecture License, and engineers must maintain active Professional Engineer (PE) certification. We verify every license directly with the issuing authority before activating your profile, and we perform periodic re-verification to ensure continued compliance.
Current Insurance Coverage
General liability insurance with minimum $1 million per occurrence coverage is required for all contractor and builder partners. Workers' compensation insurance is required for any company with employees. Professional liability (errors and omissions) insurance is required for architects, engineers, and design professionals. We may request copies of your insurance certificates during the verification process.
Demonstrated ADU Experience
We prefer partners who have completed at least three ADU projects, though we consider newer companies with strong portfolios in related residential construction. Project photos, client references, and examples of completed work help strengthen your application. If you are new to ADU construction but have extensive experience in residential building, home additions, or related construction, we encourage you to apply and explain your transferable experience in your application.
Positive Reputation
We review public reputation indicators including Google reviews, Yelp ratings, Better Business Bureau status, and CSLB complaint history. Partners should have a clean disciplinary record with no unresolved consumer complaints, license suspensions, or significant legal actions. We understand that occasional negative reviews are normal in the construction industry, and we evaluate reputation holistically rather than penalizing individual complaints.
Responsiveness and Professionalism
We expect network partners to respond to homeowner inquiries within 24 to 48 hours, provide transparent pricing and timelines, and maintain professional communication standards. The GatherADU brand depends on every partner interaction being positive, and we monitor response rates and homeowner feedback to ensure network quality is maintained. Partners who consistently fail to respond to leads or receive repeated negative feedback may have their profiles paused or removed from the network.
Why the ADU Market Is Your Biggest Growth Opportunity
California's ADU Revolution
California has undergone a fundamental transformation in ADU policy since 2017. A series of landmark legislative actions, including Assembly Bills 68, 881, 671, and Senate Bills 13 and 897, have systematically eliminated the regulatory barriers that historically prevented homeowners from building ADUs on their properties. Parking requirements have been relaxed or eliminated. Setback requirements have been standardized at just four feet. Impact fees for ADUs under 750 square feet have been abolished. And cities are now required to approve compliant ADU applications within 60 days, eliminating the multi-year approval timelines that once characterized the process.
The results have been dramatic. Los Angeles County alone issued over 23,000 ADU permits in 2024, up from fewer than 200 per year before the reforms began. Statewide, ADU permits now account for approximately 20% of all new housing production in California, representing a multi-billion dollar annual construction market. Industry analysts project continued growth through 2030 and beyond, driven by ongoing housing shortages, rising property values that incentivize homeowners to maximize their lots, and continued legislative support at the state level.
Expanding Beyond California
While California leads the nation in ADU adoption, the trend is rapidly spreading to other states. Oregon, Washington, Colorado, Vermont, Montana, and Connecticut have all passed statewide ADU legislation in recent years. Cities across the country, from Portland to Minneapolis to Austin, are reforming their zoning codes to allow ADUs. The federal government has signaled support through FHA financing programs and HUD research grants. This national expansion represents a massive opportunity for ADU professionals to grow their businesses into new geographic markets.
GatherADU is positioned to grow with this national trend. Our city page database already covers municipalities in Oregon and Washington, and we are actively expanding our coverage to additional states as new ADU legislation is enacted. Partners who join our network now position themselves to benefit from this expanding geographic footprint as we add new markets to our platform.
The Economics for ADU Professionals
The ADU market offers compelling unit economics for construction professionals across the value chain. Average ADU project values range from $150,000 for a basic garage conversion to $400,000 or more for a premium detached unit, with some high-end custom projects exceeding $500,000. For general contractors, this translates to gross margins typically ranging from 15% to 25% per project. For architects, engineering fees on ADU projects typically range from $5,000 to $25,000 per project, depending on complexity. Title 24 consultants can expect $1,500 to $4,000 per project. And specialty subcontractors benefit from the volume of projects being built in their service areas.
Perhaps most importantly, ADU projects tend to generate strong referral business. Homeowners who successfully build an ADU are among the most likely construction clients to refer friends, family, and neighbors. In dense urban areas of Los Angeles, it's common for a single successful ADU project to generate two or three additional referrals within the same neighborhood, as neighbors witness the transformation and recognize the rental income and property value potential on their own lots.
What Our Network Partners Say
"Joining the GatherADU network was one of the best business decisions we made last year. Within the first three months, we received more qualified ADU inquiries through GatherADU than from all our other marketing channels combined. The homeowners who find us through the platform are already educated about ADUs and ready to move forward, which means shorter sales cycles and higher close rates."
"As a modular ADU manufacturer, getting in front of the right homeowners used to be our biggest challenge. Most people don't even know that factory-built ADUs are an option. GatherADU's content does the education for us. By the time a homeowner visits our profile, they already understand the benefits of modular construction and are specifically looking for a prefab partner. That's incredibly valuable."
"The peer referral network alone has been worth the membership. I've picked up four projects in the last six months from referrals by architects and engineers I met through GatherADU. The network creates a level of trust that you just can't get from cold leads. When another professional recommends you, the homeowner is already sold before you even show up for the estimate."
Frequently Asked Questions About the Vendor Network
How much does it cost to join the GatherADU Vendor Network?
We offer multiple partnership tiers to accommodate businesses of different sizes and growth stages. We offer both free and premium listing options. Our basic listing is free and includes a vendor profile page, directory placement, and access to our partner community. Premium partnership tiers offer enhanced visibility including featured placement in search results, priority lead matching, sponsored content opportunities, and dedicated account management. Contact our partnership team for current pricing details on premium tiers.
What geographic areas does the GatherADU Vendor Network cover?
Our vendor network primarily serves California, with the strongest homeowner demand concentrated in Los Angeles County, Orange County, San Diego County, the San Francisco Bay Area, and the Sacramento metropolitan area. We also have growing coverage in Oregon and Washington state. We are actively expanding our geographic footprint and welcome partners from any area where ADU construction is permitted. Even if your area currently has limited homeowner traffic on our platform, establishing your profile early positions you to capture demand as our coverage grows in your market.
How many leads can I expect to receive?
Lead volume varies based on your service area, specialty, competition level, and the completeness of your vendor profile. Partners in high-demand areas like Los Angeles, San Diego, and the Bay Area typically see the most activity. We focus on lead quality over quantity. Rather than flooding you with unqualified inquiries, we aim to deliver informed, motivated homeowners who are ready to take the next step. Many partners report that GatherADU leads convert at two to three times the rate of leads from traditional advertising sources, making even a modest lead volume highly profitable.
Is there a long-term contract or commitment?
No. Our vendor network operates on a month-to-month basis for premium tiers, and the basic listing is free with no contract whatsoever. We believe in earning your continued partnership through performance, not locking you into long-term agreements. You can upgrade, downgrade, or cancel your membership at any time with 30 days' notice. Our retention rates are consistently high because partners see real results, not because they're contractually obligated to stay.
Can I join if I operate outside of California?
Absolutely. While our strongest homeowner base is currently in California, we welcome ADU professionals from any state where ADUs are legal. Our platform is actively expanding coverage across the United States, and partners in states like Oregon, Washington, Colorado, Texas, and Florida are positioned to benefit from early mover advantages as we grow our homeowner audience in those markets. Modular and prefab manufacturers who ship nationally are particularly well-suited to serve homeowners across our entire coverage area regardless of factory location.
Can I list multiple service areas or business locations?
Yes. Your vendor profile can include multiple service areas, and your company will appear in city pages and directory searches for all listed locations. If you operate from multiple offices or serve a wide geographic territory, we can configure your profile to maximize visibility across all relevant markets. There is no additional charge for listing multiple service areas. We want your profile to accurately reflect where you can serve homeowners so that every inquiry you receive is genuinely within your operational reach.
How quickly will I see results after joining?
Most partners begin receiving profile views and inquiries within the first two weeks of their profile going live. However, like any marketing channel, results tend to improve over time as your profile accumulates reviews, project photos, and engagement signals that improve its visibility in our directory and search results. Partners who invest in completing their profiles thoroughly, including adding project photos, detailed service descriptions, and requesting customer reviews, tend to see meaningful results within the first 30 to 60 days.
Is the network exclusive to a limited number of partners per area?
We do not impose strict caps on the number of partners per area for basic listings. However, for premium partnership tiers, we do limit the number of featured partners per specialty and geographic zone to ensure that premium visibility delivers meaningful competitive advantage. This approach balances homeowner choice with partner value. Basic partners benefit from directory inclusion and organic discoverability, while premium partners receive exclusive positioning that justifies their investment.
Can I update my vendor profile after it's live?
Yes, you can update your vendor profile at any time. We encourage partners to keep their profiles current with recent project photos, updated service offerings, seasonal promotions, and fresh customer testimonials. Active profiles with regularly updated content tend to rank higher in our vendor directory and receive more homeowner engagement. You can make changes directly through your partner dashboard or by contacting our partnership team for assistance with larger updates.
How do homeowners find and choose vendors on GatherADU?
Homeowners discover vendors on GatherADU through multiple pathways. Many arrive through organic Google searches for ADU-related queries, which lead them to our blog articles, city guides, and floor plan pages. From there, they navigate to our vendor directory. Others browse the vendor directory directly, filtering by service type, location, and verification status. Homeowners also contact our team directly for recommendations, and we match them with relevant network partners based on their project requirements. The GatherADU Verified badge, strong reviews, comprehensive project photos, and detailed service descriptions are the primary factors that influence which vendors homeowners choose to contact.
Apply to Join the GatherADU Vendor Network
Ready to grow your ADU business with a steady stream of pre-qualified homeowner leads? Complete the application form and our partnership team will review your submission within 2 to 3 business days. There is no application fee and no long-term commitment required.
What You'll Need to Apply:
- Company name and contact information
- Contractor license number (CSLB or equivalent)
- Insurance certificate details
- Description of ADU services offered
- Geographic service area
- Examples of completed ADU projects (optional but recommended)
- Company website URL
Prefer to Talk First?
If you'd like to learn more about the vendor network before applying, our partnership team is happy to answer your questions.
Partner Application Form
Complete the form below and we'll be in touch within 2-3 business days.
Ready to Grow Your ADU Business?
Join hundreds of contractors, architects, and ADU professionals who are building their businesses through the GatherADU Vendor Network. Apply today and start receiving pre-qualified leads within days.