How to Choose a Solar Installer: 12 Questions Before You Sign

The installer matters as much as the panels. Learn how to vet credentials, compare quotes, and avoid common solar scams — whether you are in the US, UK, Australia, or Canada.

Solar panels last 25 years. Your installer should still be in business — and honour their workmanship warranty — when you need them in year ten.

Choosing an installer is not about finding the lowest number on a flyer. It is about verified credentials, transparent equipment, and written commitments you can hold someone to.

Key takeaway: Get at least three written quotes, verify licences and insurance, and never sign under pressure on "today only" pricing.

Why installer quality matters more than brand hype

Tier-1 panels from reputable manufacturers perform similarly in real-world conditions. What differs is:

Correct system design for your roof and usage
Safe electrical work and code-compliant installation
Permit and grid connection handled properly
Warranty support when an inverter fails in year eight

A bad install on good panels is worse than a good install on mid-tier equipment.

Credentials to verify by region

Region	What to look for
US	State/licensed electrical contractor, NABCEP certification (preferred), general liability + workers comp insurance
UK	MCS certification (required for SEG eligibility), RECC membership, appropriate insurance
Australia	CEC-accredited installer and designer, valid ABN, state scheme eligibility if claiming rebates
Canada	Provincial electrical licence, CSA-compliant equipment, rebate programme registration if applicable

Ask for licence numbers and look them up on official registries — do not take a logo on a website as proof.

12 questions to ask every installer

What exact panel and inverter models are you proposing? (Get datasheets.)
Who holds the workmanship warranty — you or a subcontractor?
What is estimated annual production (kWh) and how was it calculated?
Who pulls permits and submits the grid connection application?
What happens if production is below your projection — any guarantee?
Is the price fixed, or can it rise after site survey?
How do you handle roof penetrations and leak warranty?
What is the payment schedule — avoid 100% upfront?
Are you using subcontractors on site day?
What monitoring is included — app, alerts, ownership of data?
How do you handle incentive paperwork (STCs, rebates, SEG registration)?
Can I speak to two recent customers in my postcode?

Installers who dodge specifics are telling you something.

Red flags — walk away

Door-to-door "free solar" or "government programme" without named programme ID
No physical address or company registration you can verify
Lease or PPA presented as the only option without comparing cash purchase
Pressure to sign today for a "tax credit" that does not apply to your situation in 2026
Quotes 30%+ below comparable bids with no equipment difference explained
Requests full payment before materials arrive

How to compare quotes apples-to-apples

Line item	Installer A	Installer B	Installer C
System size (kW)
Panel model
Inverter type
Est. annual kWh
Gross price
Incentives applied
Workmanship warranty
Timeline to energise

Normalise on $/W or £/kW after the same incentive assumptions.

Site survey — what happens after you pick a finalist

Reputable installers schedule a technical survey before final contract:

Roof structure and tile type
Main service panel capacity and spare breaker spaces
Cable route and inverter location
Shading measurement (solmetric or drone)

Price should be fixed after survey unless you change scope. If survey reveals panel upgrade need, get a written change order — not a verbal "small extra."

Insurance and contracts

Confirm installer carries general liability and workers compensation. Ask whether your home insurance needs a rider during install. Contract should specify:

Start and completion windows
Weather delay policy
Cleanup and penetration leak warranty (often 2–10 years)
Cancellation terms before permit submission

Local references that actually help

Ask for two neighbours within 20 km who installed in the last 18 months. Drive past reference roofs if possible. Check Google reviews for patterns — repeated mentions of post-install ghosting matter more than one angry review.

Frequently asked questions

Is the biggest company always the safest?
Not necessarily. Regional specialists with long tenure often outperform national sales machines on service.

Should I use my roofer's solar partner?
Only if they hold proper solar credentials (MCS, CEC, NABCEP) — roofing and solar electrical work are different disciplines.

Can I buy equipment online and hire an installer?
Some markets allow customer-supplied equipment; many installers refuse due to warranty liability. Expect narrower installer choice.

What if quotes disagree on system size?
Production modelling differences cause this. Ask each why their kW differs — usage assumptions should align.

Why marketplaces beat cold-call lead lists

Traditional lead sellers sell your phone number to five installers at once — hence the spam. A solar marketplace model matches you with vetted installers when you request quotes, so you control timing and comparison.

Volts is built for homeowners who want verified quote requests without outbound sales harassment. Installers unlock your request when they are serious about quoting — not when they bought your data from a list broker.

Request verified quotes through Volts · How Volts works

After you choose — before install day

Confirm equipment serial numbers match the contract
Photograph roof condition before work starts
Understand who to call for monitoring issues vs physical repairs
Keep a copy of warranty certificates and as-built diagram

Bottom line

The best solar deal in 2026 is not the loudest ad — it is a fair price from a credentialed installer with clear equipment and warranty terms. Compare in writing, verify licences, and take a week to think if you need it.

Next step: Get matched with vetted installers →