Solar Business Guides

A residential solar job is part roofing, part electrical work and part paperwork, and it isn't finished until two gatekeepers sign off: the building department and the utility. You pay for equipment well before the system can run, and what that system is worth to the customer depends on state and utility rules.

Licensing: your state draws the lines

Licensing is a state question, and the answer often splits the job: roof attachments and racking on one side, PV (photovoltaic) wiring and the connection to the home's electrical service on the other. Ask your state's contractor and electrical licensing boards which license covers each part, who must hold it and how helpers must be supervised, and get the answers in writing. Cities and counties may add their own registration.

Certifications sit on top of a license, not in place of one. NABCEP says its certifications are voluntary and do not replace state licensing requirements ¹. The NABCEP certification ladder starts with the PV Associate credential, aimed at people new to solar ². For the PV Installation Professional certification, NABCEP counts only permitted installations that passed final inspection, where you held a decision-making role such as lead installer ¹, so start an install log on your first job.

How to start a solar installation business lists the licensing questions to ask your board, along with credentials, permits, utility interconnection, distributors and insurance.

Safety: falls, and circuits the sun keeps live

Rooftop solar puts fall hazards and electrical hazards in the same workday. In residential construction, each employee working 6 feet or more above a lower level must be protected by a guardrail system, a safety net system or a personal fall arrest system, unless the rule allows an alternative ³. On a pitched roof that usually means harnesses, lifelines and rated anchors.

The electrical hazard is unusual: modules produce voltage whenever light hits them, even with a disconnect open, and pulling a PV connector apart under load can draw an arc. Train every hire to test before touching, to know what stays energized after shutdown, and to treat cracked modules and cut cables as live. Hiring your first solar installer covers the training, records and gear involved, the questions to ask your board about what a new hire may do, and pay data for the trade.

Permits and permission to operate

Each building department decides what you submit and what its inspector checks. Where a city or county has adopted SolarAPP+, an online platform that instantly issues permits for code-compliant residential rooftop systems ⁴, your permit doesn't wait in a plan review queue. Elsewhere, track review and inspection times by department so promised install dates hold up.

The utility is the second gate. A grid-tied system stays off until the utility grants permission to operate (PTO), and each utility runs its own interconnection process. Its rules also set what exported power is worth: net metering is one approach, and the rules vary by state and utility and they change, so check them before every quote. The startup guide shows how to map both gates.

How homeowners buy solar

Homeowners compare solar quotes closely: system size in kW DC, price per watt, equipment, warranties and projected savings. A proposal that prints its assumptions (usage, production inputs, export rules) survives that comparison. How to write a solar proposal builds one, with cash, loan, lease and power purchase agreement (PPA) terms side by side. Under a lease or PPA the homeowner doesn't own the system, and tax credits and incentives go to the system's owner ⁵, which changes what you can promise and who pays you.

Decisions often stall on events rather than price: a year of bills, the site survey, financing, an HOA review or a roof that needs replacing first. Follow up when the event happens.

Selling in homes carries legal weight. A contract signed in the buyer's home can fall under the FTC's Cooling-Off Rule, which covers sales of $25 or more made there and lets the buyer cancel until midnight of the third business day after the sale ⁶. Wait until that window closes to file permit and interconnection paperwork or order equipment. How to get more solar customers covers that rule, consent for marketing calls and texts, referrals and partnerships with roofers and electricians.

The money: per-watt pricing, milestones and the end of 25D

Solar is priced per DC watt, but build each price from the job's own costs: equipment, labor, permit and interconnection fees, customer acquisition, overhead and profit. Site-specific adders such as a main panel upgrade, roof work, trenching or a battery go on separate lines. How to price solar installations walks through cost buckets, adders and system sizing.

You also pay for equipment before the job is finished, and the last payment can wait on the utility. How to invoice solar installations sets up milestone billing, lender funding stages and change orders for panel upgrades found after the site survey. Deposit rules vary by state, so check how much deposit to ask for before you set yours.

Example: On an illustrative $24,000 job (8 kW at $3.00 per DC watt), $9,000 of equipment ships in week three. Bill nothing until PTO and you carry that $9,000, plus crew wages, until the utility acts. Bill a deposit and payments at delivery and installation, and only the final payment waits. Round, made-up numbers.

The federal Residential Clean Energy Credit (section 25D) was worth 30% of qualifying costs for systems installed from 2022 through 2025, and no credit is allowed for expenditures made after December 31, 2025 ⁷. The IRS treats the expenditure as made when installation is complete, so a system finished in 2026 doesn't qualify even if it was signed in 2025 ⁸. Remove the credit from every pitch and proposal, and send customers' tax questions to a tax professional.

Deadlines matter more than seasons

There's no solar seasonal playbook here, on purpose: demand follows incentive deadlines and utility rule changes more than the weather. Track the dates that move sales:

• Each utility's export credit and rate changes, with effective dates.
• Incentive deadlines, including programs that can run out of funds.
• Federal deadlines for the companies behind leases and PPAs. IRS Notice 2025-42 explains that the section 48E credit isn't available for a solar facility placed in service after December 31, 2027 if its construction began after July 4, 2026 ⁹. Ask your financing partners what they will fund, and until when.
• Your own permit and PTO times for each department and utility.

Weather still matters at the edges: production swings with the seasons, so prepare customers for bills that change month to month, and wind, rain, snow and heat cost roof days.