What does AB 1565 require for subcontractors on California K-12 school projects?

California Assembly Bill 1565 (codified at Public Contract Code Section 20111.6) requires that on public school construction projects over $1 million, the prime GC prequalify all subcontractors with a contract value over $10,000 in designated trades - including mechanical (C-20), plumbing, electrical, and other specialty trades. The prequalification questionnaire covers safety record (EMR), CSLB license history, financial capacity (bonding and insurance), project experience, and litigation history. Subcontractors must be prequalified at least 10 business days before the bid date.

Which California agencies require AB 1565-style subcontractor prequalification?

AB 1565 specifically covers K-12 school districts under PCC 20111.6. University of California (UC) and California State University (CSU) campuses have their own equivalent prequalification requirements. Some community college districts and other public agencies have adopted similar prequalification requirements voluntarily under PCC 20101 (which authorizes public agencies to require prequalification). DSA-regulated projects (K-12, community college, state-funded) almost uniformly require prequalification. The net result: any California mechanical contractor pursuing public school, UC, or CSU work should maintain a standing prequalification package.

What is a good EMR for a California mechanical contractor seeking school work?

Experience Modification Rate (EMR) below 1.0 is generally required to pass prequalification on California K-12 and CSU projects. Most public school districts and UC/CSU campuses set a maximum EMR of 1.0 as a hard pass/fail criterion - contractors above 1.0 are disqualified regardless of price or experience. An EMR below 0.85 is considered strong and is a competitive advantage on GC-driven prequalification. EMR is calculated by your workers' compensation carrier; a three-year average is typically reported.

How far in advance must a mechanical subcontractor be prequalified before a bid date?

Under AB 1565 (PCC 20111.6), subcontractors must be prequalified at least 10 business days before the bid date. This is a hard deadline - a subcontractor who submits their prequalification questionnaire 8 business days before the bid date cannot be listed on the bid, regardless of their qualifications. GCs should communicate prequalification deadlines to their mechanical sub pool at least 3–4 weeks before the bid date to allow time for questionnaire preparation, agency review, and re-submission if corrections are needed.

Can a mechanical contractor maintain a standing prequalification for multiple school districts?

Yes. Most California school districts accept prequalification questionnaires on a rolling basis outside of active bid cycles, and prequalifications are typically valid for one year. A mechanical contractor who completes prequalification with the largest school districts in their service area - Sacramento USD, Los Angeles USD, San Diego USD, Fresno USD, and others - can maintain a standing prequalified status that allows them to be listed on bids throughout the year without the 10-business-day scramble. Sierra Mechanical maintains standing prequalifications with multiple Northern California school districts and CSU campuses.

Public Works · Prequalification · Published 2026-06-03

How California GCs can prequalify a mechanical subcontractor: the AB 1565 compliance checklist for K-12 and public agency projects

California AB 1565 made subcontractor prequalification mandatory for most public school construction work, and UC/CSU campuses run equivalent programs. For GCs pursuing school and public agency HVAC contracts, a mechanical sub who shows up without a prequalification package 10 business days before the bid is disqualified - and takes your bid down with them. This guide covers exactly what a C-20/C-43 contractor must prepare, which agencies require it, and how to maintain standing prequalification status for a competitive advantage.

Blueprint floorplan for a California K-12 school HVAC project requiring AB 1565 prequalification — K-12 school HVAC projects in California require AB 1565 subcontractor prequalification - mechanical subs must be on the agency's prequalified list at least 10 business days before bid.

What AB 1565 requires: the statutory framework

California Assembly Bill 1565, signed into law and codified at Public Contract Code (PCC) Section 20111.6, requires that on public school construction contracts over $1 million, the prime contractor must prequalify all subcontractors with individual contract values over $10,000 in certain designated trades. The designated trades include mechanical (HVAC and piping), plumbing, electrical, carpentry, masonry, concrete, and others as defined by the school district.

The prequalification must occur before the bid date - specifically, the subcontractor must be prequalified at least 10 business days before the bid is due. This is not a soft deadline. A subcontractor who is not on the agency's prequalified list at bid time cannot be listed on the bid by the prime contractor. If the prime's bid lists an unprequalified mechanical sub, the bid is non-responsive and is rejected.

The AB 1565 prequalification applies to the awarding agency (the school district) - each district runs its own prequalification program. A mechanical sub prequalified with Sacramento USD is not automatically prequalified with Elk Grove USD, even if they are bidding similar scope. Maintaining prequalification across multiple agencies is an ongoing administrative responsibility for mechanical contractors pursuing school work. For DIR registration requirements that work alongside AB 1565 compliance, see our article on California public works HVAC DIR registration and prevailing wage.

Which agencies require prequalification for mechanical subs

The following California public agencies require or commonly use subcontractor prequalification for mechanical work:

K-12 school districts (PCC 20111.6 mandatory): All California K-12 districts on construction contracts over $1 million must prequalify specialty subs including mechanical. This covers virtually all HVAC replacement and new construction school work.
Community College Districts: While not mandated identically to K-12 under AB 1565, most California community colleges adopt PCC 20101 prequalification authority and apply similar requirements to specialty trades.
California State University (CSU) system: CSU campuses run their own prequalification programs for specialty trades on capital projects. CSU prequalification is campus-by-campus and is typically valid for 1–2 years.
University of California (UC) system: UC campuses operate Contractor Prequalification Programs for specialty trades on building projects over $1 million. UC prequalification programs are more detailed than most K-12 programs and require project-specific financial capacity documentation.
State-funded facilities (DGS, CalTrans, state parks): The California Department of General Services (DGS) runs a contractor prequalification program for projects over certain thresholds. DGS prequalification is statewide, not project-specific.

For projects requiring DSA (Division of the State Architect) approval - all K-12, community college, and state-funded facilities - the DSA overlay adds its own IOR (Inspector of Record) requirements during HVAC installation, which are separate from but related to the prequalification process. Our guide on how GCs choose a mechanical subcontractor in California covers how DSA-regulated projects factor into subcontractor selection.

The AB 1565 prequalification document package: what a C-20/C-43 must submit

Each school district has its own prequalification questionnaire, but the core document requirements are consistent across California agencies. A complete AB 1565 prequalification package for a mechanical contractor typically includes:

Safety and insurance documentation

Experience Modification Rate (EMR): Current and three prior years from your workers' compensation carrier. Most agencies require EMR at or below 1.0. An EMR above 1.0 is a hard disqualifier at most agencies.
OSHA 300 log: Most recent three years of OSHA 300 recordable incident logs. Agencies review incident rates (TRIR and DART) alongside EMR.
Certificate of Insurance: Current general liability, workers' compensation, and auto liability certificates. Most school district prequalification programs require minimum coverage limits of $2 million per occurrence general liability, $5 million umbrella, $1 million workers' comp.
Safety program documentation: Written Injury and Illness Prevention Program (IIPP) as required by California Labor Code. Some agencies also request evidence of Heat Illness Prevention Program (HIPP) and Fall Protection Program.

License and legal standing

CSLB license history: Current C-20 (HVAC and Refrigeration) and/or C-43 (Sheet Metal) license with expiration date, license number, and bond amount. Any prior license suspensions, revocations, or disciplinary actions must be disclosed.
DIR registration confirmation: Current DIR public works contractor registration number.
Business entity documentation: Articles of incorporation or fictitious business name filing, confirming the legal entity bidding on the project.

Financial capacity

Bond capacity letter: From your surety, confirming available bonding capacity (typically requested as a specific dollar amount or "available capacity" letter). Most school district prequalifications require demonstrated capacity at 1–1.5x the project contract value.
Financial references: Some agencies request bank references or a brief financial statement to confirm the contractor can carry the working capital for the project.

Project experience

List of completed projects of similar type and size, with owner/GC contact references.
For DSA-regulated projects: prior DSA project experience is reviewed and weighted heavily by school district evaluators.
Litigation and claims history: disclosure of any claims, lawsuits, arbitration proceedings, or project terminations in the past 5 years.

The 10-business-day window and what it means operationally

The 10-business-day prequalification deadline creates a specific operational challenge for GCs running competitive bids. In practice:

The GC must identify all subcontractors they plan to list before the 10-business-day mark - which means the GC's sub selection must be largely complete more than two weeks before the bid date.
If the preferred mechanical sub is not prequalified with the specific district, the GC either finds an alternative sub or risks losing the bid if the prequalification application isn't processed in time.
School district prequalification offices have variable processing times - some approve within 3 business days; others take 8–10. There is no guarantee of expedited review.

The operational solution that experienced GCs use: build a prequalified mechanical sub list per major school district before bid season. GCs who work with Sierra Mechanical can rely on our standing prequalifications across Northern California school districts and CSU campuses. We maintain current prequalification packages and can provide GC confirmation letters within 24 hours of a bid invitation.

How prequalification improves win rates

Beyond the compliance requirement, prequalification delivers a real competitive advantage for the mechanical contractor willing to invest in it:

Reduced GC bid risk: GCs know a prequalified sub can be listed on a bid without last-minute scrambling. This makes prequalified subs the default choice for school-focused GCs, even when they are not the absolute lowest price.
Relationship signal to agency: Being prequalified with a school district signals that your company has survived a background check, safety review, and financial review. District facilities managers give weight to that signal when influencing GC sub selection.
Repeat access: Once prequalified with a district, you receive notification of future bid opportunities. School districts are repeat customers for mechanical work - HVAC systems need replacement every 15–20 years, and a 50-school district has ongoing replacement work annually.

Sierra Mechanical maintains active prequalifications with multiple Northern California school districts and CSU campuses. For GCs looking to add a prequalified mechanical subcontractor to their bid pool, our GC Partners page includes our current prequalification status documentation. For project inquiries, contact our bid desk.

Working with Sierra Mechanical on K-12 and public agency projects

Sierra Mechanical Corporation holds current DIR registration, maintains EMR below 1.0, carries $2 million per-occurrence general liability with $10 million umbrella, and has active bonding capacity documentation available for prequalification submissions. Our standing prequalification packages are available to GCs within 24 hours of a bid invitation. We are experienced with DSA-regulated HVAC scope and IOR coordination across Northern California school districts.

Bid desk: (916) 638-8605. Request our prequalification status documentation online.

References: California Public Contract Code §§ 20101, 20111.6; California Labor Code § 6400 (IIPP); DIR Public Works Contractor Registration; CSLB Contractor License Requirements. Information current as of 2026-06-03.

This article is general guidance and does not constitute legal advice. Consult the specific agency's prequalification requirements for project-specific obligations.