California Weatherization Assistance Program (WAP)

California Department of Community Services & Development

Available Weatherization

About This Program

Federally funded weatherization services for low-income households to reduce energy costs and improve comfort. Services include insulation, air sealing, HVAC tune-ups, water heater upgrades, and minor repairs. No cost to eligible households.

Average weatherization package includes insulation, air sealing, and system upgrades

Verified against California Department of Community Services & Development's official page on 2026-06-17.

Data last verified 2026-06-09. How we verify our data.

Key Details

  • Free energy efficiency upgrades up to $9,000
  • Income at or below 80% AMI required
  • Insulation, air sealing, HVAC improvements
  • Water heater and minor home repairs included
  • Homeowners and renters eligible

How to Apply

Get free help applying Visit Official Program Page Track this program

(916) 376-8100

A grant-savvy contractor in Foster City, CA can handle the paperwork, inspections, and timelines so your funding releases on schedule. Getting matched is free.

You will likely need a contractor to apply

Projects like this almost always need a licensed contractor, and many grants ask for a written estimate as part of your application. Lining up a contractor in Foster City early keeps your application moving.

Get matched with a contractor

Each program sets its own contractor rules. Check the official program page for exact requirements.

Your application paperwork

A free program that lowers your energy bills by improving your home's energy efficiency (insulation, air sealing, heating system repair or replacement). It is income qualified and run through local agencies, and the California Department of Community Services and Development (CSD) administers it in California.

Steps to apply

  1. Find the local weatherization agency that serves your county (use the official page above, which lists providers, or call the number there).
  2. Apply through that local agency (some areas also offer an online application).
  3. The agency checks your household income eligibility.
  4. They do a home energy audit, then install the improvements at no cost to you.
Get the official form

Documents you will likely need

  • Proof of household income for everyone in the home (or proof you get SSI, LIHEAP, or other qualifying assistance).
  • Proof you own or rent the home.
  • A recent utility bill for the home.
  • Photo ID.
Download this checklist (PDF)

Requirements vary by program and locality. Confirm the exact rules on the official program page. We can help you prepare your paperwork, but you submit it yourself.

Deadline: Rolling applications

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