Getting Solar Panel Quotes: What to Expect

Most people get one or two solar quotes and go with the one that felt right in the meeting. That's understandable — the sales process is designed to build trust and close quickly. But getting the quoting process right can save you thousands and protect you from a poor installation. Here's how to do it properly.

How Many Quotes Do You Need?

Three is the practical minimum. Two quotes give you a comparison but no tiebreaker and no real sense of the market. Four or five quotes is ideal if you have the time — you'll quickly see where the outliers are (suspiciously cheap is as much a warning sign as suspiciously expensive).

The solar market is competitive enough that there's usually meaningful price variation for identical specifications. Don't feel disloyal to the first installer you spoke to — getting multiple quotes is standard practice and every reputable company knows this.

The Site Survey

A proper quote requires a site survey. At minimum, a legitimate installer will assess your roof using satellite imagery before quoting. For a firm, accurate quote, they should visit in person to:

• Assess roof condition, pitch, and orientation
• Check for shading at different times of day
• Inspect your consumer unit (fuseboard) to confirm compatibility
• Check the location for the inverter
• Confirm whether scaffolding will be needed

Be wary of any installer who provides a firm price without any assessment. You can get rough ballpark figures online, but a real quote requires real information.

What a Good Quote Must Include

A thorough quote should be a document you can review at your desk, not a figure scribbled on a piece of paper. Here's what it should contain:

Equipment specification:

• Panel make, model, wattage, and number of panels
• Inverter make, model, and rated power
• Whether optimisers or microinverters are included (if relevant)
• Mounting system type

System performance estimate:

• Projected annual generation in kWh (not just "enough for your household")
• Estimated annual saving in £ based on your consumption
• Estimated SEG export income
• Payback period calculation with the assumptions clearly stated

Installation scope:

• Whether scaffolding is included or extra
• Whether DNO notification is included
• Whether building regulations notification is included (if applicable)
• Any electrical upgrade work required (e.g., consumer unit)

Warranties:

• Panel product and performance warranty terms
• Inverter warranty terms
• Installer workmanship warranty (minimum 2 years; 5–10 years is better)

Price and payment terms:

• Total price inclusive of all work
• VAT at 0% (confirm this is the rate applied)
• Payment schedule and deposit amount
• Finance options if applicable

Company details:

• MCS certificate number
• Company registration number
• Insurance details

If a quote is missing any of these, ask for them. An installer who can't or won't provide a full written specification is not one you want working on your roof.

Comparing Quotes Like for Like

The biggest trap in comparing solar quotes is assuming that identical-sounding systems are actually identical. A "4kW system" from three different installers could involve three completely different combinations of panels, inverters, and mounting quality.

Build a comparison table. For each quote, note:

• Total system output (kWh/year estimate)
• Panel make, model, efficiency, and warranty
• Inverter make, model, and warranty
• Workmanship warranty length
• Scaffolding included?
• DNO notification included?
• Total price

Now you can compare. A quote that looks £800 cheaper might actually involve PERC panels with a 12-year warranty versus N-type panels with a 15-year warranty, and a shorter inverter warranty. That's a different product, not the same product at a better price.

GivEnergy All-in-One 5kW Hybrid Inverter

£1,200

rated power kw

5

max pv input kw

7.5

mppt channels

2

battery voltage v

48V

View on Amazon

Affiliate link — we may earn a small commission at no extra cost to you

Questions to Ask Every Installer

Before the survey:

• Are you MCS certified? (Verify independently at mcscertified.com)
• Will you provide a full written specification with named components?
• Who will physically carry out the installation — your own employees or subcontractors?

During or after the survey:

• What is the projected annual generation in kWh, and what assumptions is that based on?
• Is there any shading risk, and how have you accounted for it?
• Do you recommend optimisers or microinverters for my roof? If not, why not?
• What happens if there's a problem with my roof after installation?
• How long is your workmanship warranty, and what does it cover?

On price:

• Is VAT at 0% applied? (It should be for residential installations)
• Is scaffolding included?
• What's the payment schedule, and what is the maximum deposit?
• Is there a finance option, and if so, what is the APR?

GivEnergy All-in-One 9.5kWh Battery

£5,500

capacity kwh

9.5

usable capacity kwh

8.6

chemistry

LFP

cycles

6000

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Affiliate link — we may earn a small commission at no extra cost to you

Using Comparison Services

Quote comparison services let you submit your details once and receive multiple quotes. They're useful for generating initial contact with installers, but understand the business model: the service earns a referral fee from installers, which means the installers in the network are those willing to pay for leads, not necessarily the best local installers.

Use comparison services to get the process started, then supplement with direct approaches to highly-rated local installers you've found independently.

After You've Chosen

Once you've chosen an installer, get everything in a written contract before paying any deposit. The contract should match the quote exactly — if anything has changed or been removed, query it before signing.

Check what the typical costs are for your area and system size, and if you're considering spreading the cost, read our guide on solar finance options before committing.

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