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Weatherization Jobs in Castro Valley, CA (NOW HIRING)

Synergy Companies

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Weatherization Installer

San Leandro, CA · On-site

$18 - $35/hr

Weatherization Technicians assess, retrofit, and seal residential and commercial buildings to reduce energy loss and lower utility costs for homeowners and tenants. Working under Synergy Companies ...

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Weatherization information

See Castro Valley, CA salary details

$14

$22

$31

How much do weatherization jobs pay per hour?

As of Sep 6, 2026, the average hourly pay for weatherization in Castro Valley, CA is $22.48, according to ZipRecruiter salary data. Most workers in this role earn between $18.85 and $25.82 per hour, depending on experience, location, and employer.

What is weatherization?

A weatherization job involves making homes and buildings more energy-efficient by sealing air leaks, adding insulation, and improving heating and cooling systems. Workers assess structures for energy loss and implement upgrades to reduce utility costs and improve comfort. These jobs are often part of government or utility programs aimed at helping homeowners save energy and reduce environmental impact. Weatherization technicians may also educate residents on energy-saving practices.

What does a weatherization worker do?

A typical day in weatherization involves conducting home energy assessments, identifying areas of energy loss, and implementing solutions such as installing insulation, sealing air leaks, and upgrading ventilation systems. You may work independently or as part of a small crew and regularly interact with homeowners to explain the work being done. The role often requires traveling to different homes or buildings, adapting to various work environments, and ensuring all measures follow strict safety and quality guidelines. Over time, experienced weatherization professionals may advance to supervisory or energy auditor roles.

What are the key skills and qualifications needed for weatherization?

To thrive in Weatherization, you need strong knowledge of building science, energy efficiency principles, and hands-on skills in installing insulation, air sealing, and ventilation systems, often supported by a high school diploma or equivalent. Familiarity with diagnostic tools like blower doors, infrared cameras, and certifications such as BPI (Building Performance Institute) or RESNET is typically required. Attention to detail, problem-solving abilities, and good communication skills help distinguish top performers in this field. These skills are crucial for ensuring homes are energy efficient, safe, and comfortable for occupants while meeting industry standards.

What does a weatherization contractor do?

A weatherization contractor installs and repairs insulation, sealing, and energy-efficient systems in buildings to improve energy efficiency and reduce utility costs. They often work with tools like blowers and caulking guns and may require certifications such as OSHA or EPA to handle hazardous materials. The job typically involves working in homes or commercial buildings and may require physical labor and attention to safety standards.

What cities near Castro Valley, CA are hiring for Weatherization jobs?

Cities near Castro Valley, CA with the most Weatherization job openings:

Weatherization jobs near you
Infographic showing various Weatherization job openings in Castro Valley, CA as of August 2026, with employment types broken down into 87% Full Time, 11% Part Time, and 2% Contract. Highlights an 92% Physical, 3% Hybrid, and 5% Remote job distribution, with an average salary of $46,751 per year, or $22.5 per hour.

Weatherization Installer

Synergy Companies

San Leandro, CA • On-site

$18 - $35/hr

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 26 days ago

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Job description

We have immediate openings for weatherization specialist / handyman positions. Synergy Companies is a full service Energy management contractor specializing in residential and small commercial energy upgrade products and services.


Weatherization Technicians assess, retrofit, and seal residential and commercial buildings to reduce energy loss and lower utility costs for homeowners and tenants. Working under Synergy Companies Weatherization Assistance Program guidelines or private contractors, they install insulation, air seal building envelopes, upgrade HVAC systems, and conduct diagnostic testing to verify energy performance improvements. 



Duties and responsibilities:

  • Conduct blower door tests to measure building air leakage and identify infiltration pathways in residential units
  • Air seal attics, rim, joists, penetrations, and wall cavities using foam, calking, and weather-stripping per building science standards
  • Perform combustion safety testing on furnaces, boilers, and water heaters to identify carbon monoxide and backdrafting hazards
  • Assess and document pre- and post - retrofit energy conditions using blower door, duct blaster, and combustion analyzers
  • Replace inefficient lighting, showerheads, and appliances as part of whole-house energy upgrade packages
  • Diagnose and seal duct leakage using mastic, metal tape, and aerosol duct sealing systems per Synergy Companies guidelines
  • Complete client intake forms, work orders, and job-site documentation required by utility program administrators
  • Coordinate with HVAC programs and electricians for when weatherization scope overlaps with code-required trades work
  • Explain completed measures and expected utility savings to homeowners and answer questions about building performance improvements


Qualifications:

  • Previous experience in maintenance or other related fields
  • Familiarity with hand-held tools and equipment
  • Deadline and detail-oriented
  • Ability to handle physical workload
  • Wx certification (Bonus)
  • Detail oriented with paperwork


Benefits:

  • Salary depends on experience and bonuses on every paycheck
  • Medical insurance at no cost for the employee
  • Dental insurance
  • Vision insurance
  • 401k with 50% match
  • Vacation pay offered after 1 year of employment 
  • 5 days paid sick time
  • Company truck for leads
    • Company gas card for leads

Company Description

Great established principle-based company, BBB A-PLUS rating.
Check us out at www.synergycompanies.com