Solar installation companies hit growth limits fast without reliable subcontractors who can handle roof work, electrical, permitting, or inspections. Expanding through partnership means more bids you can win, faster project turnaround, and the ability to scale without hiring full crews. This guide shows you how to build a network of trusted subs and turn it into a repeatable revenue engine.
Why Subcontracting Matters in Solar
Most solar companies start as lean operations—owner-operator with maybe one crew. That model works until you're turning down jobs because you're booked three months out. Rather than burden yourself with payroll, benefits, and training overhead, subcontracting lets you grow on demand. You bid bigger projects, bring in specialized partners for specific tasks, and keep profit margins healthy by paying only for work you've sold.
The solar install process itself demands diverse skills. One crew might excel at residential rooftop work but have no commercial experience. Another might be electricians first, comfortable with combiner boxes and disconnects but less comfortable on pitched roofs. Building a network means matching the right sub to the right job type—and charging appropriately for coordination.
Identify What You Need to Subcontract
Before you start recruiting, audit your own workflow. Ask yourself honestly:
- What tasks take you longest?
- Where do you feel less confident or experienced?
- Which job types come up that you typically decline or delay?
Common subcontracting opportunities in solar include:
- Roof work: flashing, penetration sealing, mount installation on difficult geometries
- Electrical: interconnection, panel grounding, battery integration, meter upgrades
- Permitting and inspections: expediting paperwork, managing city requirements, securing third-party engineering stamps
- Trenching and conduit installation: underground service runs on larger properties
- Structural analysis: roof load assessments or snow-load calculations for marginal properties
- Final cleanup and landscaping: restoration after installation
Be specific about what you're actually outsourcing. "I need a roofer" is vague. "I need someone who can flash a roof penetration in architectural shingles on 6:12 pitches, complete three to four jobs per month, respond within 24 hours" is actionable.
Finding and Vetting Subcontractors
Start local. Solar communities are tight—ask fellow installers who they trust, what they pay, and what problems they've had. Attend regional solar conferences or trade shows; you'll meet candidates already working in your market. Check references rigorously: call their last three projects, ask how they handle schedule changes, and observe whether they answer phones promptly.
Verify licensing and insurance. A residential roofer in your state needs roofing contractor licensing. An electrician doing solar interconnection typically needs electrical licensing plus solar-specific training (NABCEP certification is the industry standard). Call their insurance company directly—don't just glance at a certificate. Confirm they're bonded if they're handling customer deposits or permits.
Expect to pay competitive local wages. Experienced solar electricians in mid-tier markets run $65–$95 per hour all-in. Roofers doing solar flashing typically charge $85–$130 per hour depending on region and complexity. Get written quotes for sample jobs so you know your cost before you bid.
Building Relationships That Stick
Your first three jobs with a sub are your audition. Be explicit about expectations: timeline, quality standards, communication frequency, and payment terms. Pay on time, every time—nothing ruins a subcontractor relationship faster than chasing invoices.
Create a simple job packet they can grab and run with: site photos, spec sheet, customer contact info, access details. The easier you make their day, the faster they move. If they crush it, loop them in on regular work. Most good subs value predictability and volume over chasing one-off gigs.
Scaling the Model
Once you've got two or three reliable subs in each category, you've built optionality. You can bid larger jobs knowing you can staff them. You can open a new service area knowing you can execute. You can even offer customers faster install windows because your bottleneck shifts from your crew to your coordination.
Document everything—job cards, scope agreements, payment history. Listing your services on platforms like Mercoly means you get found for bigger projects that require subcontractor bandwidth, and you can actually win the work because your network is in place.
Frequently Asked Questions
Q: Should I use written agreements with subs or keep it informal? Use written scope agreements for every job, even if it's one page. It prevents misunderstandings about deliverables, timeline, and payment—the three biggest sources of conflict.
Q: How much should I mark up subcontractor costs? Typical markup is 15–25% depending on your overhead and the complexity of coordination required. If you're managing scheduling, inspections, and customer communication, you've earned that margin.
Q: What if a sub doesn't show or does poor work? Have a backup sub lined up for every role and a clear quality standard written down. Replace underperformers fast—one bad installation damages your reputation far more than it helps you save on labor.
Start recruiting your first subcontractor this week and lock in a job within 30 days.