The SEO vs PPC debate is one of the most common strategic questions UK business owners face when allocating marketing budget. The short answer: they serve different purposes, have different economics, and the best strategy for most businesses is a phased combination of both.
How SEO and PPC Compare
Cost Model
SEO: You pay for the work (agency retainer or in-house resource), but the traffic is free. Once you rank, you keep receiving traffic without paying per click. The cost per acquisition decreases over time as the asset matures.
PPC: You pay for every click, every month, indefinitely. Stop spending, stop getting traffic. Average UK CPC across all industries is approximately £2.50–£4.00, with competitive sectors (legal, finance, insurance) running £20–£100+ per click.
Speed
SEO: 3–6 months before meaningful results, 6–12 months before ROI-positive outcomes for most businesses.
PPC: Immediate. A well-set-up Google Ads campaign can be live and generating leads within 24–48 hours.
Permanence
SEO: Rankings built over 12 months don't disappear overnight. An established page 1 position will typically hold for months or years with minimal ongoing maintenance.
PPC: Entirely paid. Pause the campaign and your traffic drops to zero immediately.
Click-Through Rate
Organic position 1: approximately 27–30% CTR (Backlinko research)
Google Ads (top position): approximately 6–10% CTR — and a significant portion of users now consciously skip ads
Trust
Organic results are perceived as more trustworthy than ads. Studies consistently show that searchers trust organic results more for research-stage queries, while ads perform better for transactional, high-intent queries.
When to Choose SEO
- You have a 12+ month time horizon before you need ROI
- Your target keywords have high CPC (making PPC expensive long-term)
- You're building a business you want to own long-term — not a short-term campaign
- Your category has high organic search volume for informational queries (blog content can drive leads)
- You want to build an asset, not rent visibility
When to Choose PPC
- You need leads immediately (new business, seasonal campaign, product launch)
- You want to test messaging and offers before committing to SEO content
- Your keyword targets are very competitive nationally but you only need leads for 3 months
- You're targeting very specific, high-intent queries with small search volume
The Best Strategy: Phase Both
For most UK SMEs, the optimal approach is:
- Months 1–6: Run PPC for immediate lead flow while SEO builds. Use PPC conversion data to identify which keywords actually convert — feed this back into your SEO keyword targeting.
- Months 6–12: As organic rankings improve and organic leads arrive, reduce PPC spend on keywords where you now rank organically. Reinvest PPC budget into new keyword targets or retargeting.
- Month 12+: Scale back PPC to only the highest-performing or highest-CPC keywords where organic ranking is harder to achieve. SEO now handles the bulk of your lead flow at effectively zero marginal cost.
This approach means you never have a "gap" in lead flow while building your long-term organic asset. It also means your SEO investment becomes self-funding — the revenue from PPC-generated leads in months 1–6 pays for the SEO retainer.
Model Your Numbers
Use our SEO vs PPC Calculator to enter your specific budget, CPC, and conversion data — it shows you exactly which month SEO overtakes PPC in cumulative profit, and what your 2-year picture looks like under each scenario.
If you're already running PPC, use our Traffic Value Calculator to see what your current organic traffic would cost in Google Ads — this quantifies what you're leaving on the table by not investing in SEO.