How to Hire Subcontractors: A Guide for Contractors

As a general contractor, your reputation is only as good as the crew you bring onto the job site. Scaling your business often means bringing on specialized subcontractors to handle trade-specific tasks like electrical, plumbing, or masonry. However, managing subs requires a different level of oversight than managing your own employees. To streamline this process and connect with vetted specialists, you can sign up for an Angi Pro account to grow your network and manage your leads more effectively.

Below is a professional-grade guide to vetting and hiring subcontractors to ensure your projects stay on schedule, within budget, and up to code.

What Services Does a Subcontractor Offer?

The team of subcontractors you need to hire depends on the project scope and who is already involved. For a simple kitchen remodel, you might only need a plumber and an electrician to supplement your crew. However, a full-scale addition requires a more complex hierarchy, potentially including excavators, framers, and HVAC specialists.

Building a reliable "bench" of subcontractors allows you to pivot quickly when project scopes change or when specialized trades like masonry, roofing, or custom cabinetry are required. By evaluating your existing internal bandwidth against the technical requirements of the job, you can strategically outsource phases to ensure every trade—from rough-in to finish work—is handled by a master of that craft.

Tips for Hiring a Subcontractor

Unreliable subcontractors producing shoddy work can wreak havoc on a renovation project and negatively affect reputations. Following these steps will help you find a dependable specialist. 

1. Source Qualified Talent

Don't just hire the first person who answers the phone. To maintain a high standard of workmanship, you need a deep roster of reliable specialists.

• Leverage Pro Networks: Use professional directories like Angi Pro to find highly rated specialists.

• Professional Referrals: Consult with other GCs or local building inspectors. Inspectors often know which subs consistently pass inspections and stay up-to-date on local code requirements.

• Portfolio Review: Subcontractors are specialists. Verify they have at least 3–5 years of experience in their specific field and ask for a portfolio of recent, relevant projects to confirm their quality matches your brand’s standards.

2. Verify Credentials and Risk Compliance

The biggest risk to your business when hiring subs is liability. If they aren't covered, you are.

• License Verification: Confirm the sub holds a valid state license for their specific trade.

• Insurance & COIs: Request a Certificate of Insurance (COI) directly from their agent. Ensure they carry:

  • General Liability: To cover property damage or bodily injury.

  • Workers’ Compensation: Essential even for small crews, as it protects you from being held responsible for their injuries.

• Safety Records: For larger commercial or industrial jobs, check their Experience Modification Rate (EMR) and OSHA records to assess their safety history.

3. Conduct Technical Interviews

Treat the hiring process as a partnership vetting. Before awarding a bid, ask high-level questions:

• "What is your current crew capacity and estimated lead time?"

• "Do you own the specialized equipment for this scope, or will you be billing for rentals?"

• "What are your site safety protocols and daily cleanup standards?"

• "How do you handle unforeseen site conditions or change order requests?"

4. Formalize the Subcontract Agreement

Never rely on a "handshake" or a verbal quote. A robust written contract protects your margins and your timeline.

• Detailed Scope of Work: Define exactly what is (and isn't) included.

• Payment Schedule: Align payments with specific milestones (e.g., 20% at rough-in, 10% at final inspection). Never pay the full amount upfront.

• Quality & Warranty: Specify the materials to be used and the warranty period they provide for their labor.

• Tax Compliance: Always collect a Form W-9 before the first check is cut. This ensures you can issue a 1099-NEC at year-end and claim the expense as a business deduction.

5. Management and Accountability

Once the project begins, your role shifts to project manager and quality control.

• Daily Reporting: Establish a protocol for daily or weekly progress reports.

• On-Site Inspections: Don’t wait for the building inspector. Regularly walk the site to ensure the sub is following your safety standards and project specs.

• Documentation: Keep a log of hours worked, materials delivered, and any unforeseen delays. This documentation is your primary defense in the event of a dispute.

6. Post-Project Closeout

Before issuing the final payment:

• Final Walkthrough: Ensure all "punch list" items are completed to your satisfaction.

• Lien Waivers: Have the subcontractor sign a lien waiver upon final payment to protect the property owner from any future claims by the sub or their suppliers.

• Feedback Loop: If the sub did excellent work, keep them in your rotation. Reliable subs are the lifeblood of a profitable contracting business.

Questions to Ask a Subcontractor

Asking the right questions at the interview stage can help you ferret out subcontractors without the right experience, reputation, or reliability. Some worth asking include:

• Can you provide the paperwork to show that you’re licensed, bonded, and insured?

• When are you available, and what is your timeline for completing the project?

• What equipment do you have, and what materials would you need?

• Can you provide details of your safety record?

• Where can I view customer testimonials and reviews of your work?

After Your Subcontractor Has Finished

Once your subcontractor has completed the job, make the final payment promptly and consider leaving a review of their work and acting as a reference. This can help future clients and build a good relationship with your subcontractor should you wish to work with them again.