Solar installers send a written proposal before any equipment is ordered, usually after a site visit or remote design review and a look at the customer's electric bills. Customers typically compare several quotes on price per watt, panel and inverter brands, warranties, and expected production. A clear proposal also sets expectations about roof condition, electrical upgrades, and utility timelines.
When to use estimates: Use estimates to provide project quotes and get client approval before starting work. Once approved, convert your estimate to an invoice with one click to collect payment.
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Equipment substitutions are common because of supply issues, and the customer should know what they are buying and when a substitution is allowed.
Shading, roof orientation, and tilt drive output. Stating assumptions and that estimates are not guarantees limits disputes about performance.
Rotten decking, undersized rafters, and old roofing can force extra work. Say how these will be priced if found.
The main panel and wiring distances are the biggest sources of cost changes after signing.
Customers assume this is included. Spell out who submits applications and who pays the fees.
Permitting, inspections, and utility approval are outside your control. Give realistic ranges rather than fixed dates.
Warranty length is a main comparison point and should be written down, with who handles claims.
| Service | Priced | Typical range |
|---|---|---|
| Residential rooftop system, installed | per watt DC | $2.50-3.80 |
| Battery storage installation (labor and equipment, single unit) | flat fee | $9,000-16,000 |
| Main service panel upgrade | flat fee | $1,800-4,500 |
| Solar panel removal and reinstall for roof work | per panel | $150-300 |
| Service call / troubleshooting | per hour | $100-175 |
| Inverter replacement (labor only) | flat fee | $500-1,200 |
| Permit and interconnection handling | flat fee | $500-1,500 |
| Panel cleaning and system inspection | per visit | $150-400 |
Typical US ranges. Rates vary by region, experience, and job size.
Customers compare per watt, so show it, but also give the final total after any known add-ons. Avoid surprise extras by including the main panel and trenching if the site visit shows they are needed.
Presenting a base system, a larger system, and a system with battery storage helps the customer choose and often raises the average job size. Keep each option clearly priced.
State unit prices for common extras, such as sistering a rafter or adding a subpanel, so a change order is just a quantity times a known price.
Equipment costs, tariffs, and incentives can change. A 15 to 30 day validity period protects your margin.
Most residential installers provide this free as part of sales. For complex commercial work, engineering studies, or battery design with multiple site visits, a paid assessment that is credited toward the job if the customer signs is common.
Fifteen to thirty days is typical. Shorter windows make sense when equipment prices are volatile or an incentive deadline is near.
Only for items clearly outside the original scope, and only with the customer's written approval. Put the conditions that could change the price, such as hidden roof damage or a panel upgrade, in the original quote.
Ten to thirty percent at signing is common, though some states cap deposits on home improvement contracts. Check your local rules and state the deposit amount and schedule in the quote.
Use the Solar Installer invoice template to bill the client, or convert this estimate once it's approved.
Solar Installer invoice template