PPC vs SEO for lead generation: which to do first, and when to run both
If you need enquiries this quarter, do PPC first. If you've got an established site and a budget you can commit to for a year or more, do both. SEO on its own is right in a narrower set of cases than most people selling it will admit. Below is the comparison on what a business owner actually cares about: how soon the first enquiry lands, how the cost behaves, how much control you have, and what happens the month you stop paying. One declaration up front: GrowthLine is a PPC agency. We don't sell SEO, and this page still recommends it where it fits.
The short answer
PPC and SEO put you on the same Google results page for the same searches. The difference is how you get there. With PPC (Google Ads, for most UK businesses) you pay per click for a position in the ads at the top, and you can be there within days. With SEO you earn a position in the unpaid results by having the page Google decides is the best answer, and that takes months of work before it produces anything.
So "ppc or seo" comes down to one question: how soon do you need the phone to ring, and can you fund a channel that pays back slowly? The rest of this page is the detail behind that. The other channel question people ask at the same stage is covered in Google Ads vs Facebook Ads for lead generation.
ppc = rented position, fast · seo = earned position, slow
Time to first enquiry: days against months
PPC
Google usually reviews new ads within a business day and they enter auctions as soon as they're approved, so impressions start within a day or two. First enquiries arrive as click data builds, typically somewhere in weeks two to six depending on how many clicks a day your budget buys, and a fair verdict on cost per enquiry needs about three months. The full sequence is at how long Google Ads takes to work.
Three accounts we've published show the front end of that. A brand-new London clinic reached roughly 70 enquiries a month within 90 days, at about £53 each on £4,000 a month of spend. A steel fabricator with no website had around £120,000 a month of recurring contracted work land in the first 30 days, at about £42 per enquiry. A DPF-cleaning specialist's cost per lead went from £86.50 to £19.97 in 30 days. Three accounts, not a promise, and each case study says what it doesn't prove. The point here is the timescale: weeks.
SEO
There's no equivalent switch. A new page has to be crawled, indexed and then ranked above pages that already rank, and the ones already there have usually been building for years. On an established domain a well-targeted page can move in months. On a new domain with few links it's slower, and nobody honest can give you a date. To estimate your own timeline, search your money terms, note who ranks, and ask how long they've been at it and how much they've published. That's what you have to beat.
ppc: impressions in days, enquiries in weeks · seo: months, undated
Cost shape: pay per click against pay per month regardless
Google charges nothing for the account and nothing for an ad being shown. You pay per click at a price set by an auction for each search, your daily budget is a hard cap, and you're billed in arrears. If someone runs the account there's a management fee on top, paid to them rather than Google; ours is a flat fee from £750 a month, on the pricing page. The mechanics are in what Google Ads costs in the UK. The shape that matters: cost scales with volume. More enquiries means more clicks means more spend. In return you get a cost per enquiry you can read off the account every week, provided the tracking's been verified.
With SEO you pay for work: writing pages, fixing the site, earning links. That's a fixed monthly cost whether the pages rank or not, and for the first months there's nothing to divide it by. Then, if it works, the shape flips. A page that ranks produces clicks that aren't billed, so the more enquiries it brings in, the lower the cost per enquiry falls.
A useful way to hold it: PPC is a running cost, SEO is closer to a capital cost. Neither is cheaper in the abstract. The honest comparison is cost per enquiry over the period you can actually fund.
ppc: variable, scales with leads · seo: fixed, then free at the margin
Control and how fast you can test
With PPC you choose the exact search terms you show for, the area, the hours, and the page each click lands on. You can pause it on a Friday and restart it on a Monday, and you can test two landing pages against each other and have an answer in a fortnight if the budget buys enough clicks. The catch is that you're renting: Google can change the auction, a competitor can outbid you, and none of the position carries over.
With SEO you don't choose where you rank. Google does, and it can change its mind in an update with no explanation and nothing you can buy to get back. You can't test a headline against the results page in a fortnight, because the results page takes months to respond. In return, the position isn't bid against.
For a business that needs to learn what converts, PPC is the faster classroom by a long way. The search terms report shows which exact queries produced an enquiry and which produced a click and nothing else. That's why we'd usually run ads before deciding which SEO pages to build. If clicks are arriving but enquiries aren't, start with the clicks but no conversions diagnostic.
ppc: you choose, you test in weeks · seo: google chooses, you test in months
Compounding, and what happens when you stop paying
This is the argument people reach for when they say SEO is better, and it's half right. Stop paying for PPC and the ads stop the same day. Stop paying for SEO and the pages keep ranking for a while, sometimes a long while, so the enquiries carry on after the invoices do.
The half that gets missed: PPC does leave assets behind. The landing pages and the tracking are still there, and so is the list of searches that produce enquiries along with what each click cost. That's what points an SEO programme at the right terms instead of the ones that looked good in a tool.
And SEO decays. Competitors keep publishing, Google keeps updating, and a page left alone drifts down. It's cheaper to maintain a ranking than to build one, but it isn't nothing.
ppc stops dead but leaves data · seo carries on but decays
Risk: how much you can lose, and how fast you'd know
The PPC risk is wasted spend on a bad build: broad match with no negatives, tracking that was never verified, clicks sent to the homepage instead of a page that matches the search. Those are the faults we find most in audits, and every one is diagnosable within weeks because the account shows spend and result side by side. The daily budget caps the damage and you can stop at any point.
The SEO risk is paying for a year and not ranking, or ranking for terms that don't produce enquiries. It's slower to discover, because for the first months "nothing yet" is the expected result and you can't tell it apart from "nothing ever". The defence is the same one we'd give for ads: judge it on enquiries from organic search, tracked in the same place as everything else, not on positions or visits.
ppc: bounded, visible in weeks · seo: unbounded in time, visible in months
PPC vs SEO side by side
Google Ads stands in for PPC here because it's what a UK lead-generation business almost always means by it.
| What you care about | PPC (Google Ads) | SEO |
|---|---|---|
| Time to first enquiry | Impressions in days, first enquiries typically weeks two to six, fair verdict at about three months | Months on an established domain, longer on a new one, no reliable date |
| How you pay | Per click, in arrears, capped by a daily budget, plus a management fee if someone runs it | A monthly fee for the work, paid whether or not anything ranks |
| Cost per enquiry over time | Visible within weeks, then roughly flat: more enquiries cost more clicks | Nothing to measure at first, then falls as rankings arrive and clicks stop being billed |
| Control | You choose terms, area, hours and landing page, and can pause any day | Google chooses where you rank, and can change it in an update |
| Speed of testing | A landing page or ad test can read out in a fortnight with enough budget | The results page takes months to respond to a change |
| When you stop paying | Ads stop the same day; pages, tracking and search-term data remain | Rankings carry on, then decay as competitors publish and Google updates |
| Main risk | Wasted spend on a bad build, bounded by the daily budget, found in weeks | A year of fees with no enquiries to show, found late |
| Best when | You need enquiries now, the job is urgent or searched-for, or you need to learn what converts | You have a funded year, an established site, and buyers who research before they call |
Which to do first, by situation
New business, or an established one that needs enquiries now: PPC first
If the next three months matter, PPC is the only one of the two that can act on them. You're in front of people already searching for the work, the daily budget limits what a mistake can cost, and inside a quarter you know your cost per enquiry and which searches produced it. The new-start clinic above is the clean example: no site history, no rankings, roughly 70 enquiries a month inside 90 days. Whether the maths works for your click prices and job values is the first thing a free Google Ads audit checks, and if it can't work, the audit says so.
Established site, content budget, twelve-month horizon: both
If your site already ranks for something, you've got a person or budget to produce pages, and you can fund a channel that pays back in year two, run both. PPC covers the enquiries while SEO builds, and the ads tell the SEO work which pages to write first.
When SEO alone is right
Three cases. First, when click prices are too high for the job value to support, and no landing page conversion rate can rescue the auction; the working for that is in what's a good Google Ads budget for lead generation. Second, when your buyers research for months before they contact anyone, so the enquiry comes from being the source they kept coming back to. Third, when you genuinely can't take on more work for a year, in which case paying per click for enquiries you'd turn away makes no sense.
When PPC alone is right
Urgent, searched-for, local work where the customer decides in an hour and rings the first credible result: the kinds of jobs on our trades PPC page. Anything seasonal or capacity-driven where you need to switch the tap on and off. And any business that's never had a conversion-tracked channel, because the ads will show you what converts and you can decide about SEO from evidence.
To be plain about where we sit: we're a Google Ads agency. We don't sell SEO and won't bolt it on as an upsell, and if the audit says your case is an SEO case we'll tell you and you'll need someone else for that part. We do practise it, though. Pages like this one exist because we think organic search is worth the work.
Running both: the sequence that works
- Ads first, with verified tracking. A researched keyword list with negatives, a landing page that matches the search, and conversion tracking you've watched fire. Judge it at three months, not three weeks.
- Pull the converting search terms. After a few months the search terms report shows which exact queries produced enquiries and what each click cost. Ordered by enquiries and then by click price, that's the SEO target list: expensive converting terms are where an organic ranking is worth the most.
- Build the SEO pages for those terms. One proper page per converting intent, on the same domain, sending enquiries into the same tracking so both channels report in the same units.
- Don't switch the ads off when rankings arrive. The idea that organic will pick up the paid clicks is an assumption. Test it: pause one campaign for a fixed period and watch total enquiries, not organic traffic. Keep whichever mix produces the most enquiries at a cost you're happy with.
What a management engagement covers on the PPC side of that is listed on the Google Ads agency page.
Frequently asked questions
Is PPC or SEO better for lead generation?
It depends on how soon you need the enquiries and how long you can fund the channel. PPC puts you in front of people searching for the job within days and you pay per click, so it's the better first channel when you need enquiries this quarter. SEO takes months to produce anything and you pay for the work whether or not it ranks, but once a page ranks the clicks aren't billed, so it's the better long-term asset. Established businesses that can fund both usually end up running both.
Should I do SEO or Google Ads first?
Google Ads first, in most cases. It produces enquiries in weeks rather than months, the daily budget caps your risk, and the search terms report tells you which searches actually turn into enquiries, which is the best keyword research you'll get before committing to SEO. The exceptions: click prices too high for the job value, buyers who research for months before contacting anyone, or a business that genuinely can't take on more work for a year.
Is SEO cheaper than PPC?
Not in the way the question implies. SEO costs money every month whether it ranks or not, and for the first months there are no enquiries to divide that by. PPC costs per click from day one and the cost per enquiry is visible in the account within weeks. Over a long horizon a ranking page usually produces cheaper enquiries because the clicks stop being billed; over a short horizon PPC is the only one of the two that produces any. Judge both on cost per enquiry over the period you can actually fund.
Can you run PPC and SEO together?
Yes, and it's the normal end state for an established business. Run ads first with verified conversion tracking, use the search terms that produce enquiries as the target list for SEO pages, then keep the ads running as rankings arrive rather than assuming organic will cover it. Test that assumption by pausing a campaign for a fixed period and watching total enquiries, not organic traffic.
Find out whether the PPC maths works before you fund either channel
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