+48% ROAS Lift on 21% Less Spend Through a Tracking-First Rebuild, German Ecommerce, Google Ads

A German ecommerce client needed accurate conversion tracking before any optimisation could work. The account was running blind, campaigns optimising on misfired conversion signals, which meant every spend decision was a guess.

What we did

• Rebuilt conversion tracking from the ground up, server-side, deduplicated, source-aligned

• Implemented value-based bidding only after tracking was provably clean

• Restructured campaigns around verified lead-to-customer signals

• Cut spend on tracking-blind campaigns that looked profitable on paper but weren't

The results

• ROAS: 2.78x → 4.11x (+1.33, a 47.8% lift)

• Conversions: 716 → 827 (+111)

• CPA: €19.52 → €13.32 (dropped €6.20, -31.8%)

• Conversion value: €38.9K → €45.3K (+€6.4K)

• Ad spend: cut 21% over the period

Why it matters

Most agencies optimise before tracking is right, which means optimising on noise. Getting the data trustworthy first, then rebuilding the campaign structure on top of clean signals, lifted ROAS nearly 48% on lower spend. For ecommerce accounts where every spend decision compounds, that foundational fix is worth more than any tactical optimisation.

Running Google Ads on conversion tracking you don't fully trust? Book a strategy call.