The perennial argument in every UK installer’s marketing meeting is whether the next £2,000 should go into Google Ads or into content and technical SEO. Both channels can fill a diary. Both can also burn cash quietly for months before anyone notices the return isn’t there. With 257,397 MCS installations recorded in 2025 (up 32% year-on-year) and roughly 21.6 GW now deployed across the UK, the installer market is no longer a cottage industry — and the acquisition economics are starting to separate winners from also-rans. This piece looks at the actual cost structures, timelines and blended strategies that determine where installer budgets genuinely win.
The two channels aren’t substitutes — they’re different machines
PPC (Google Ads, Microsoft Ads, Meta lead-gen) is a rental model. You pay per click or per lead, traffic arrives the moment the campaign goes live, and it stops the moment you stop paying. SEO is a build model. You invest in pages, technical infrastructure and links, rankings climb over months, and — if the site is maintained — the traffic keeps arriving with no per-click cost once you’ve earned the position.
That distinction matters more in solar than in most verticals because installer keywords are some of the most expensive in UK PPC. “Solar panels [town]” and “solar panel installers near me” routinely sit in the £8-£25 cost-per-click range in competitive regions, and commercial/B2B terms like “commercial solar installation” or “solar for warehouses” can go higher still given the deal size behind them. At £15 CPC and a realistic 4-6% landing-page conversion rate, a single lead can cost £250-£375 before you’ve even picked up the phone. Compare that with a well-built page ranking organically for “solar panel installers [town]” that costs nothing per click once it’s positioned — the entire economic case for SEO in this trade is the avoided CPC multiplied by lead volume over the page’s lifetime.
The head-to-head economics
Here’s how the two channels typically compare for a regional UK solar/electrical installer running both in parallel:
| Factor | PPC | SEO |
|---|---|---|
| Time to first lead | Same day–48 hrs | 3–9 months (new domain), 6–10 weeks (established site, striking-distance terms) |
| Cost per lead (residential) | £120–£375 | £15–£60 once ranked (amortised content/dev cost) |
| Cost per lead (commercial, e.g. warehouse/factory solar) | £300–£900+ | £40–£150 once ranked |
| Scales instantly? | Yes, budget-limited | No — capped by ranking position and search volume |
| Survives a paused budget? | No — traffic stops same day | Yes — pages keep ranking (with maintenance) |
| Trust signal to buyer | Neutral-to-suspicious (obviously an ad) | High — organic result reads as earned/independent |
| Best for | Launch, seasonal spikes, new service lines, testing offers | Compounding pipeline, brand equity, low marginal cost at scale |
The “trust signal” row is easy to underrate. Solar is a high-consideration purchase — homeowners are handing over £6,000-£17,000 for a domestic system, or £900-£1,200 per kWp for a commercial roof — and buyers increasingly skip past the top three paid slots to click an organic result they perceive as more credible. That bias is exactly why sites like commercialsolarpanelsinstallation.co.uk exist as content hubs rather than landing pages: they’re built to rank and hold trust, not to be switched off in a slow month.
Timeline reality: what actually happens month by month
Months 0-1 (PPC live, SEO invisible): Paid campaigns generate leads from day one. Meanwhile a new or rebuilt SEO site is being crawled, indexed and given essentially zero visibility. If you needed leads this week, PPC is the only lever that works.
Months 2-4: PPC continues at a flat cost-per-lead (assuming no seasonal CPC inflation — and solar CPCs do spike March-June as searches rise with daylight hours). SEO content starts appearing on page 2-4 for long-tail terms — town-plus-service combinations, “cost of solar panels [region]”, niche commercial queries. No leads yet, but the foundation is visible in Search Console.
Months 5-9: This is where SEO either proves itself or doesn’t. Well-structured location and service pages — the kind detailed in the thecostofsolar.co.uk cost of solar panels UK breakdown — start moving into striking distance (positions 5-15) for their target terms. Blended CAC starts falling because organic leads are arriving at near-zero marginal cost alongside the still-running PPC leads.
Month 10+: For a site that’s been built and maintained properly, organic now supplies a meaningful share of total leads at a fraction of PPC’s cost-per-lead. PPC budget can often be reallocated — either scaled back to a maintenance level or redirected into commercial/B2B terms where organic competition is thinner and deal values are higher (a single warehouse or factory roof, per solarpanelsforwarehouses.co.uk or solarpanelsforfactories.co.uk, can be worth more than dozens of domestic jobs).
Why “just do SEO” is bad advice for most installers
The trade press occasionally frames this as SEO being cheaper and therefore always the better long-term bet. That’s true on a per-lead basis at maturity, but it ignores three things installers actually face:
- Cash flow. An installer with three vans and a full diary in September can’t wait nine months for organic traffic if a competitor opens two streets away next month. PPC buys time SEO cannot.
- Seasonality and capacity. Solar demand is not flat across the year. PPC can be dialled up in the March-August peak and dialled down in winter; SEO rankings don’t respond to a dial at all — they respond to sustained investment regardless of season.
- New service lines. Adding battery storage, EV charging or heat pump installation to your offering means you have zero ranking history for those terms. PPC validates demand and messaging in weeks; SEO for a new service can take as long as it did for your original core service.
Conversely, “just do PPC forever” is worse advice, because CPC in this sector has been rising steadily as more installers competed for the same domestic search volume post-2025’s record installation year. An installer relying solely on paid traffic has a marketing cost that scales linearly with volume forever — there’s no point at which the channel gets cheaper per lead.
Blended CAC: the number that actually matters
Most installers track PPC cost-per-lead and, if they’re SEO-aware, organic sessions — but rarely calculate a single blended customer acquisition cost across both channels. That’s the number worth building a spreadsheet for, because it’s the one that tells you whether marketing spend is actually working:
Blended CAC = (Total PPC spend + Total SEO/content spend + tooling) ÷ Total leads from both channels, over a rolling 90-day window.
A regional installer spending £3,000/month on PPC (generating, say, 12 leads at £250 each) and £1,500/month on content/technical SEO retainer (generating, once mature, 15-20 leads at effectively zero marginal cost) has a blended CAC that falls steadily as the SEO leads compound, even while total spend stays flat. That’s the entire argument for running both channels simultaneously rather than choosing one — PPC keeps the diary full while SEO’s share of the blend grows, and the blended number trends down over 12-18 months rather than staying flat (PPC-only) or dipping to zero then flatlining once you hit a ranking ceiling (SEO-only).
It’s also worth noting that a mature SEO asset changes what PPC needs to do. Once organic is capturing the branded and long-tail traffic, PPC budget can be redeployed toward genuinely incremental terms — new postcodes, commercial verticals, or high-intent bottom-funnel searches like “solar quote [town]” — rather than paying to appear against your own organic listing.
Where this plays out differently for commercial vs residential
Commercial solar sits in a different economic bracket entirely. A single site like ececoenergy.com or drenergyltd.co.uk chasing a warehouse or factory installation is pursuing a deal that can be worth as much as 10-15 domestic jobs combined, at £900-£1,200/kWp installed. That changes the CPC tolerance completely — a £900 CPC feels absurd for a homeowner lead but is trivial against a six-figure commercial contract. It also changes the SEO opportunity: commercial search volumes are far lower, but competition is thinner too, which is exactly why hub sites like solarpanelsforhotels.co.uk, solarpanelsforcarehomes.co.uk and solarcarparks.co.uk can rank credibly for sector-specific commercial terms that a generalist installer site never will. An installer targeting commercial roofs is often better served pairing a modest always-on PPC budget with a content strategy built around procurement-stage questions — payback period, MEES compliance, PPA vs capex — because that’s what a facilities manager or finance director is actually searching before they’ll take a call.
The domestic-vs-commercial split also affects which grant and incentive information belongs on which page. Residential 0% VAT on solar and battery installations runs until 31 March 2027 (reverting to 5% after), which is a genuinely strong, time-limited PPC hook right now — “book before the VAT relief window closes” has real urgency behind it without needing embellishment. Farm-based commercial solar sits under the Improving Farm Productivity grant in England (around 25% of eligible cost, with different rates in Scotland, Wales and Northern Ireland) — installers should be precise here, since conflating this with older FETF figures or quoting a flat 40% misleads prospects and damages trust once they check.
Practical allocation by installer stage
- Pre-revenue or new territory: 80-90% PPC. You have no rankings to lose and need proof of demand fast.
- Established with 20+ jobs/month: 50/50 split, with SEO content built around your highest-margin services (battery attach-rate, EV charger add-ons) and PPC covering seasonal peaks and new postcodes.
- Market leader in your region: 70-80% SEO/organic, with PPC reserved for defensive branded terms and high-value commercial verticals where organic hasn’t yet been built out.
For a deeper look at how installers are pricing battery attach-rates into their acquisition math, Solar Weekly’s own UK solar industry 2026 data round-up is worth cross-referencing, and for consumer-facing framing that PPC landing pages can borrow from, thebritishsolarblog.co.uk’s guide on whether solar panels work in the UK climate answers the objection that still kills a meaningful share of paid clicks before they convert.
None of this is a reason to pick a side permanently. The installers seeing the best blended CAC in 2026 are the ones treating PPC as the pressure valve and SEO as the foundation — reviewing the blend quarterly, not annually, and being honest about which channel is actually paying for the next van.
The practical takeaway
Run PPC when you need leads this month; build SEO when you want leads that don’t disappear the day you stop paying for them. Track a single blended CAC number rather than judging each channel in isolation, because that’s the only figure that tells you whether the mix is actually working — and revisit the split every quarter as your rankings mature and your commercial pipeline grows.