If you sell construction services or plumbing services in California, you have probably noticed the same word popping up on more permits than it used to. ADU. Accessory dwelling units have quietly become one of the most reliable sources of residential construction leads in the state, and they bring plumbing work with them almost every time.
That second part matters more than most contractors realize. An ADU is not just a small house. It is a full kitchen, a full bathroom, and a new water heater, which means it is also a plumbing job hiding inside a construction permit.
Why ADUs Keep Feeding Residential Construction Leads
California cities and counties are required under Government Code Section 65400 to file an Annual Progress Report with the Department of Housing and Community Development every year. ADU permits are one of the categories tracked in that report, right alongside single-family and multifamily units.
That reporting requirement exists because state law has pushed cities to make ADUs easier to permit. The result is a housing type that keeps getting built even when larger residential projects slow down.
- ADU permits are filed with the local building department, which makes them public record
- They show up separately from single-family and duplex permits in HCD’s housing data
- They tend to move faster through approval than a full new home, so the lead-to-groundbreaking window is shorter
Where Residential Plumbing Leads California Show Up Inside an ADU Job
An ADU permit rarely stays a carpentry-only job. Once the framing is approved, you get the following types of residential plumbing leads in California:
- A new sewer lateral tie-in or an extension off the main line
- A full bathroom rough-in, sometimes two if the unit includes a half bath
- A kitchen line for the sink, dishwasher, and refrigerator water hookup
- A dedicated water heater, often a tankless unit to save space
Under the Contractors State License Board rules, this kind of rough-in work has to be done by a licensed C-36 plumbing contractor. That licensing requirement is exactly why a general contractor building the ADU usually brings in a plumber rather than handling it themselves, and that handoff is the lead.
How to Track Residential Construction Leads Before They Hit the Bid Stage
The building department is the earliest signal for residential construction leads in California. Most permit files show the project type and scope before a general contractor has lined up every subcontractor, which gives a plumber a window to reach out first.
- Check local building department permit portals for filings tagged as ADU or accessory structure
- Review HCD’s Annual Progress Report data by jurisdiction to see which cities are approving the most ADUs
- Build a relationship with ADU-focused general contractors and designers, since they see the plumbing scope before it is ever bid out
Turning One ADU Permit Into Two Kinds of Residential Construction Leads
The real opportunity here is not choosing between residential construction leads and plumbing leads. It is recognizing that a single ADU permit is both at once.
A general contractor who partners with the same plumber across multiple ADU projects builds a faster, more predictable bid. A plumber who tracks residential construction leads alongside plumbing leads gets a head start on the next rough-in before the framing crew has even finished.
Frequently Asked Questions
Q1. How do I get residential construction leads for my construction company?
Ans: You can start with public permit data from your local building department. This should be your first step as it shows you exactly what is being built before the bidding gets competitive. Then, you can pair that with referrals from designers and suppliers. Also, a lead service can save you the time of checking permit portals city by city.
Q2. How do I get leads for my plumbing business?
Ans: You must look at where plumbing work is already required by code, like new bathrooms, water heaters, and sewer connections on ADU and remodel permits. Additionally, building relationships with general contractors who build these projects regularly is often more reliable than waiting for homeowners to search for a plumber directly.
Q3. Which firm gives residential construction leads in California?
Ans: Construction Lead Sheets tracks residential construction leads across California. They track ADU, remodel, and new-build permits, so contractors and plumbers can reach property owners and general contractors before a project goes out to bid.