How to Hire Subcontractors: Complete Guide for GCs

Your subcontractors make or break your projects. A great sub network means on-time completions, quality work, and happy clients. A bad one means delays, callbacks, and lawsuits. Here's how to build the right team.

As a general contractor, your subs ARE your business. You might sell the job, manage the client, and coordinate the schedule — but the plumber, electrician, HVAC tech, drywaller, and painter are doing the hands-on work that determines quality.

The best GCs will tell you their competitive advantage isn't marketing or pricing — it's their sub network. They have reliable, skilled tradespeople they can call who show up on time, do quality work, and communicate when problems arise.

Building that network takes time and intentionality. This guide gives you the system.

1. Where to Find Quality Subcontractors

Referrals from Other GCs

The best subs rarely need to advertise — they're booked through referrals. Ask other GCs (even competitors) who they use. Most will share names for non-competing trades. An electrician who does great work for another GC will likely do great work for you.

Supply Houses

Plumbing supply houses, electrical distributors, and lumber yards know who the good tradespeople are. They see who buys quality materials, pays their bills on time, and represents professionalism. Ask the counter staff for recommendations.

Trade Associations

Local chapters of PHCC (plumbing), NECA/IBEW (electrical), ACCA (HVAC), and NAHB (builders) maintain member directories. Association members tend to be more established and committed to their trade.

Job Sites

When you see good work on someone else's job site, ask who did it. Complimenting a tradesperson's work and asking for their card is the highest form of flattery in this industry. They'll remember you called.

Online Platforms

While referrals are best, platforms like BuildZoom, Construction Connect, and even local Facebook groups for contractors can help you find subs. Local trade-specific Facebook groups (e.g., "Electricians of [City]") are surprisingly active and useful.

2. How to Vet Subcontractors (The 7-Point Checklist)

A bad subcontractor can cost you tens of thousands in delays, rework, and legal liability. Proper vetting takes an hour and saves you from catastrophic mistakes.

3. Subcontractor Agreements: What to Include

A handshake deal is a lawsuit waiting to happen. Every subcontractor relationship needs a written agreement. Here's what it should cover:

Essential Contract Elements

• Scope of work: Detailed description of exactly what they're responsible for — and what they're NOT. Ambiguity creates disputes.
• Schedule: Start date, completion date, and any milestone dates. Include consequences for delays (back-charges, liquidated damages).
• Payment terms: Amount, payment schedule (progress payments vs. completion), retainage percentage, and payment timeline (net 15, net 30).
• Change order process: How scope changes are requested, approved, and priced. No work outside the original scope without a written change order.
• Insurance requirements: Minimum coverage amounts and requirement to maintain coverage throughout the project.
• Warranty: Duration and scope of warranty on their work (minimum 1 year is standard).
• Indemnification: Sub indemnifies you against claims arising from their work, their employees, and their negligence.
• Dispute resolution: Mediation before litigation. Specify jurisdiction and governing law.
• Termination clause: Conditions under which either party can terminate and what happens to completed work and payments.
• Lien waiver requirements: Sub provides lien waivers with each payment request.

4. Insurance & Licensing Requirements

Why This Isn't Optional

If your subcontractor's employee gets injured on your job site and the sub doesn't have workers' comp, guess who pays? You do. If your sub's faulty work causes a fire and they don't have liability insurance, guess who the homeowner sues? You.

Minimum Insurance Requirements

• General liability: $1,000,000 per occurrence / $2,000,000 aggregate minimum
• Workers' compensation: As required by your state (most states require it for any employees)
• Auto liability: $1,000,000 combined single limit
• Umbrella/excess: Optional but recommended for larger projects ($1M+)

Certificate of Insurance Best Practices

• Request COIs before any work begins — no exceptions
• Require your company to be listed as "Additional Insured" on their GL policy
• Set up certificate tracking — policies expire, and subs don't always renew on time
• Call the insurance company to verify the policy is active (COIs can be forged or outdated)
• Keep COIs on file for at least 3 years after project completion

Licensing Verification

Every sub working on your project must hold the appropriate license for their trade in your state. Verify:

• License is active and in good standing
• License classification covers the work being performed
• No disciplinary actions or complaints on file
• Bond is current (if required by your state)

5. Payment Terms & Schedules

Standard Payment Structures

Progress payments: Pay based on percentage of work completed. Most common for larger projects. Typically monthly draws based on completed work, verified by inspection.

Milestone payments: Pay upon completing specific milestones (rough-in complete, inspection passed, final walkthrough approved). Clear and easy to administer.

Completion payment: Pay the full amount upon completion and acceptance. Best for small jobs (under $5,000). Simple but requires the sub to fund the project.

Retainage

Standard practice: hold back 5–10% of each payment until the project is 100% complete, punch list is done, and all inspections pass. This is your leverage to ensure subs finish the job and fix any deficiencies.

Release retainage within 30 days of final completion. Holding it longer than necessary damages your reputation and your sub relationships.

Payment Timeline

• Net 15: Pay within 15 days of approved invoice. Faster payment gets you priority scheduling.
• Net 30: Standard. Pay within 30 days. Acceptable but not preferred by subs.
• Net 45+: You'll lose good subs. They have bills too. If you can't pay within 30 days, your cash flow management needs work.

6. Managing Subcontractors on the Job

Pre-Construction Meeting

Before work begins, hold a pre-con meeting with every sub on the project. Cover:

• Project scope and specifications
• Schedule and milestone dates
• Site access, parking, material storage
• Safety requirements and protocols
• Communication expectations (who to contact, how often to update)
• Change order process
• Quality expectations and inspection requirements

Daily/Weekly Communication

Don't micromanage, but do communicate. A quick daily check-in (even a text: "everything on track?") prevents small issues from becoming big problems. Weekly schedule updates keep everyone aligned.

Quality Control

Inspect work at critical stages — don't wait until the final walkthrough to discover problems. Key inspection points:

• Before covering work (inspect rough-in before drywall goes up)
• After each phase completion
• Before and after official inspections
• During final walkthrough

Handling Problems

When issues arise (and they will):

1. Address immediately. Small problems become big ones fast.
2. Be direct but professional. "This framing is out of square and needs to be redone" — not "your work is terrible."
3. Document everything. Photos, emails, texts. If it's not documented, it didn't happen.
4. Follow the contract. Your agreement should have provisions for deficient work. Use them.
5. Escalate appropriately. First conversation is verbal. Second is written. Third involves the contract remedies.

7. Building Long-Term Sub Relationships

The real competitive advantage in contracting is relationships. Here's how the best GCs build lasting partnerships with their subs:

Pay Fast

This is #1 for a reason. Subs talk. The GC who pays within 10 days gets first priority from every sub in town. The GC who drags payments to 60 days gets whoever's desperate enough to accept those terms.

Provide Consistent Work

Subs value consistency over one-off high-paying jobs. If you can offer steady work — even at slightly lower rates — you become a preferred GC. They'll build their schedule around your projects.

Communicate Clearly

Subs hate showing up to a job site without clear direction. Provide detailed scopes, accurate schedules, and advance notice of changes. Respect their time the way you want customers to respect yours.

Share the Schedule

Give subs as much scheduling notice as possible. "We need you next Tuesday" is bad. "The plumbing rough-in window is March 15-20, confirm your availability" is good. Better scheduling = better sub availability.

Defend Them to Clients

When a homeowner blames "the electrician" for a problem that's really a design issue or normal construction process, defend your sub. They'll notice, and they'll reward that loyalty with their best work on your projects.

Give Feedback — Good and Bad

Most GCs only talk to subs when something's wrong. Take 30 seconds to say "your tile work on the Johnson bathroom looked great" and you'll stand out from every other GC they work with. When giving critical feedback, be specific and constructive.

The Bottom Line

Your subcontractor network is the backbone of your contracting business. The GCs who invest time in finding, vetting, and nurturing sub relationships build businesses that run smoother, complete projects on time, and generate fewer callbacks and disputes.

Start by vetting thoroughly — license, insurance, references, past work. Use written agreements for every project. Pay on time, communicate clearly, and treat your subs as partners, not commodities.

The best GCs don't just manage subcontractors — they build a team that wants to do their best work for you. That's a competitive advantage no marketing budget can buy.