For 31 years, clients throughout California have trusted Stronghold Engineering with projects across all industries. The foundation of its success rests on a solid network of reliable subcontractors.

The importance of these subcontractors can’t be overstated—they ensure that each project achieves the superior quality and professionalism that Stronghold is renowned for. If you’re a quality subcontractor and interested in joining our team, this resource will help you break down the process!

The Subcontractor Selection Process

When it comes to picking the right subcontractor, Stronghold Engineering doesn’t leave anything to chance. We use a rigorous selection process to ensure that the subcontractor we bring on board aligns with our company’s values and goals.

This ensures not just quality work but a seamless working relationship. We make sure you’re treated with respect and given quality work—that’s why we were voted Best Contractors to Work for in Construction in 2022!

Qualities and Attributes We’re Looking for

Stronghold places great emphasis on certain attributes that signify a quality subcontractor. Our values guide everything we do so if you relate to these, we’d make a great team. Our core values include:

  • Quality: Deliver superior work every time.
  • Safety: Strict adherence to OSHA regulations means we go home safely.
  • Teamwork: Collaboration is crucial to a project’s success.
  • Integrity: Honest and ethical behavior is non-negotiable.
  • Commitment: Dedication to a project and to Stronghold’s values is key.

Why Would You Want to Be a Stronghold Engineering Subcontractor?

Subcontractors under Stronghold’s banner enjoy several benefits, including:

  1. Professional Growth: Opportunities to work on a variety of projects and upskill.
  2. Collaborative Environment: Work with other professionals and experts in the field.
  3. Showcase Work: Your work gets showcased as part of the prestigious Stronghold portfolio.

Our Subcontractor Application Process

Joining Stronghold as a subcontractor involves a systematic application process:

1. Prequalification Form

This is the initial step, where you express interest and provide basic details. Upon submission, a detailed bid package will be provided. You can start the prequalification process via our Trade Tapp/Building Connected prequalification link.

2. Subcontractor Forms

It’s not construction without a whole lot of forms! Our forms range from affidavits to warranty forms and to W-9s.

3. Subcontractor Billing and Release Forms

After being onboarded, the billing and release forms are next. These documents help streamline financial interactions and ensure transparency.

Send subcontractor billing and lien release forms to

4. Labor Compliance Forms

To ensure that every project remains compliant with labor laws, several forms need to be filled out and sent to the appropriate email.

Send labor compliance forms to

For private jobs, please fill out this form: Affidavit of Private Wage Compliance

We know it’s a lot but it’ll be worth it! Our team believes in quality work. If you are a  subcontractor who thinks the same, we’re sure you’d make a great fit.

Become a Part of the Stronghold Team

When you become a subcontractor for Stronghold, it’s not just about work. You become part of a community that takes pride in what they build. And the first step? Send in your bid for review.

We look forward to hearing from you soon. Thank you for your interest in working with us!