SEO vs Google Ads: which channel wins, and when
What each channel actually does
Google Ads buys you traffic for as long as you pay. The clicks start the day you launch a campaign. They stop the day you pause. The cost-per-click is determined by the keyword auction.
SEO builds an asset. The rankings take 3-12 months to appear. The traffic continues after you stop paying for the work (slowly decaying if you stop maintaining). The cost-per-click is effectively zero once you rank.
Neither is better. They are different shapes of investment. The right mix depends on time horizon, budget, and the competitive landscape of your category.
Timeline comparison
| Google Ads | SEO | |
|---|---|---|
| Week 1 | Clicks flowing, conversions possible | Audit and technical fixes underway |
| Month 1 | Optimisation cycle, CPC stabilising | GBP fixed, early ranking movement |
| Month 3 | Working leads, predictable CPL | 1-3 keywords inside top 50 |
| Month 6 | Same as month 3, slightly cheaper if optimised well | 5+ keywords inside top 30, 1-2 inside top 10 |
| Month 12 | Same plateau, costs roughly flat | Compounding, CPL falling, organic share growing |
Cost per lead, roughly
Indicative ranges for a Sydney service business. Real numbers vary heavily by category.
- Google Ads: $25-$120 per lead for residential trades, $40-$300 for higher-ticket services. Largely stable over time on a well-optimised account.
- SEO: $80-$200 per lead in the first 6 months (high because the spend is front-loaded). $20-$60 per lead by month 12-18 once rankings compound. Lower than that by month 24.
The SEO cost-per-lead falls because the same $2,000/month produces more leads over time as more keywords rank. Ads CPL is roughly flat because the auction sets a floor that does not drop.
When SEO wins
- Your business has a 6-24 month horizon and patient capital.
- Your category has high CPCs in Google Ads ($15+ per click).
- You want defensibility — competitors cannot bid you out of an organic ranking.
- Your conversion rate is decent (1%+) and your sales process is sorted.
- Your service area is locally defined (suburb-tail wins).
When Google Ads wins
- You need leads in the next 60 days.
- Your business is too new to have meaningful organic authority.
- Your conversion rate is unproven and you want to test it cheaply before investing in SEO.
- Your category has low organic competition but high Ads competition (rare but it happens).
- You have specific lead-gen events (a launch, a seasonal peak, a new service rollout).
When to run both
Most successful businesses do. The pattern that works:
- Months 1-6: Heavy on Ads, light on SEO retainer. Ads cover lead flow while SEO builds.
- Months 6-12: Even split. SEO starts producing meaningful organic leads.
- Months 12+: Reduce Ads on queries SEO now owns. Keep Ads on competitive head terms and on your own brand.
The one opinion that matters
Brand-name Google Ads are almost always worth $30-$100 a month. Even when you rank #1 organic for your own name, competitors can bid on it and steal clicks above you. A tiny Ads spend on your brand protects that traffic. Most agencies do not bother. Most should.
Frequently asked
Is SEO cheaper than Google Ads in the long run?
Usually, but with a caveat. Once SEO compounds (typically 6-12 months in), cost per lead falls well below paid Ads in most categories. Before that, Ads are cheaper per lead because SEO spending is upfront work that has not yet ranked. Plan for both in the first year.
Can I run SEO and Ads on the same keywords?
Yes, and it usually helps. Brand searches in particular benefit from having both — even when you rank #1 organic, Ads above you from competitors can siphon clicks. Running Ads on your own brand name for $50/month is often the highest-ROI ad spend you can do.
What should I spend first as a small Sydney business?
Depends on your time horizon. Need leads next month: Google Ads first, with a small SEO retainer building in the background. Need to lower cost-per-lead over 12+ months: SEO first, with Ads only on the highest-intent queries until SEO ranks. Both at once is fine if budget supports it.