Cold Email for Commercial Solar: Templates and a UK Installer's Guide

Short answer: cold email can book commercial solar surveys if you email the right limited companies from separate, authenticated domains, with three short emails that each open on something specific and ask one question. The email has one job: make the owner want to see what solar could save them. The survey is booked on the phone.

Who cold email suits

It suits installers with a named person who has a few hours every week and a clear patch and type of site. It works best alongside the phone: a warm reply is followed by a call, which is where the survey is booked (see cold calling commercial solar). It suits you less if nobody owns it, if your best prospects are sole traders or partnerships (see the rules below), or if you need surveys next week. It is a channel you build, not one you switch on.

Who to email and where the data comes from

Start from the jobs you win, not a list someone sells you. Note the building type, roof, region and who signed on your last ten commercial projects: that is your target. Typically: warehouses, factories, cold stores, workshops and offices where the business owns the building or holds a long lease. Public sector sites are a different route: see commercial solar tenders and frameworks.

• Companies House advanced search is free and filters by status, company type, registered office location, incorporation date and SIC code. It also shows whether a business is a company or LLP, which matters for the law.
• Your own records: old enquiries, quotes that went quiet, neighbours of sites you have installed.
• Contact data providers for decision-makers' work emails. Verify every address first; bounces damage the domain.
• Their website and news: a new unit, an extension, extra shifts, chilled storage. Your first line comes from here.

Google's sender guidelines say not to buy email addresses and warn that people who did not ask for your messages may mark them as spam. That is the honest risk of cold email, and why small, researched lists win.

UK rules: PECR and UK GDPR

PECR decides whether you may send the email; UK GDPR governs any personal data in it. From the ICO's business-to-business guidance:

• Every email must say who you are and give a valid address to opt out. Keep a do-not-email list; if a named person objects, stop using their data for marketing.
• Where PECR needs no consent, legitimate interests is often the right lawful basis, but run the ICO's three-part test: a legitimate interest, necessity, and a balance against the person's rights.
• Details from a third party or public source need privacy information within a reasonable period, and no later than one month. A footer line saying where you found them and where your privacy notice is will do it.

Watch farms and family firms: if one trades as a sole trader or partnership, it is an individual subscriber and cannot be cold emailed without consent. If you cannot find a business on Companies House as a company or LLP, treat it as an individual and use the phone or LinkedIn lead generation for commercial solar. The ICO says its guidance is under review after the Data (Use and Access) Act, so check the current version. This is a summary, not legal advice.

Deliverability set-up

1. Separate sending domains. Never cold email from the domain your quotes and invoices use. Register one or two close variants that redirect to your main site.
2. Real mailboxes on Google Workspace or Microsoft 365, each in a real person's name.
3. SPF, DKIM and DMARC on every sending domain, with the From: domain aligned. Start DMARC at p=none and read the reports.
4. Warm up. Google advises starting at a low volume, increasing slowly and sending at a consistent rate, not in bursts. Most sequencers include warm-up.
5. Modest volume per mailbox, spread through working hours.
6. Tracking off. There are no links in email 1, and replies are what count.

Google and Yahoo publish what they expect. Google's bulk rules cover senders of more than 5,000 messages a day to personal Gmail accounts, and its FAQ says they do not apply to mail sent to Google Workspace accounts, so most cold email to business domains falls outside them. They are still a good standard:

How to write the emails (with examples)

This is TNW's own approach, built from what gets replies in our campaigns. The email sells one small thing, never panels or a survey: seeing what the numbers could look like.

• Line 1 is the personalisation: first name, a comma and something specific about them, on one line. Never "Hi Sarah,". After a call, line 1 names the call and what they said.
• Line 2 is the relevance: why the numbers are worth seeing for them.
• Line 3 is one direct question: "Want me to show you what the numbers look like?" Never a hard ask for a meeting.
• Short: 80 words at most for email 1, 70 for follow-ups. No price or savings figure; no links, attachments or images in email 1.
• Subject: plain and specific. "Re:" only if you really spoke. No other names but theirs; signed by a real person.

These are examples written for this guide, not sent emails. Email 3 follows the same pattern as email 2, with another new angle.

Example 1: the first cold email

Example 2: follow-up with a new angle

Example 3: after a phone conversation

Every email carries the same footer as example 1.

Cadence and follow-ups

Three emails, two to three working days apart, weekdays in working hours, with emails 2 and 3 as replies in the same thread. Each must stand on its own for someone who never read email 1: name, something specific, a new reason, one question. Never "just checking in". Stop the moment anyone replies, and after email 3 leave the business alone unless something changes, such as a new site.

Replies, qualifying and booking the survey

Reply the same working day, and answer "go on then" with a phone call, not another email. Sort replies into four piles: interested (call), not now (note when and why), not interested with a reason (note it), and stop (suppress that day). Before you book a surveyor's day, check ownership or landlord consent, recent bills and ideally half-hourly data, roof or land condition and space, that the decision-maker will be there, and a reason to act. Then offer two specific times, confirm in writing and remind them the day before. The full question list is in how to qualify commercial solar leads.

What to track

Weekly: bounce rate, spam complaints (Google Postmaster Tools shows your spam rate for Gmail users), reply rate, positive reply rate, surveys booked, surveys attended and projects signed. Ignore opens. We do not quote benchmark reply rates: they swing with list and region, and your own numbers will tell you more. To see what a survey should cost, read what commercial solar leads really cost.

What it really takes

The person is the real cost, not the software. Our commercial solar lead generation guide sets cold email alongside the other channels, and the UK commercial solar market in numbers shows where the demand is.

Where it usually goes wrong

• Sending from the main domain, then quotes and invoices start landing in spam.
• Bought or unverified lists: bounces and complaints sink a new domain.
• Emailing sole traders and partnerships as if they were limited companies.
• Long emails with brochures, links, panel specs and a savings figure nobody can stand behind.
• Generic first lines that could go to anyone, or three questions in one email.
• New mailboxes sending at full volume with no warm-up.
• Slow replies and no qualification, so surveyors visit sites that were never going to sign.
• Opt-outs that are not suppressed.

Do it yourself vs have it done

Running cold email yourself is the right call if you have a dedicated person with time to do every step above, a patch you know well, and the patience to build a channel over months. For most commercial installers, the people who would do it are the people who should be on roofs and in meetings. That is what we do instead: TNW Marketing books pre-qualified, exclusive commercial solar site meetings with the decision-maker, with a show rate of 60%+. You pay per qualified, attended appointment, with no retainer and no minimum spend, and anything that cancels, does not show or misses the brief is replaced or refunded. Read how pay per appointment solar leads work, appointment setting for solar installers, the pay-per-lead vs retainer comparison and other commercial solar lead generation companies. The proof is in our installer case studies and video reviews.