The SKU Sprawl Problem
Large catalogues create a fundamental challenge: Google's algorithms need data to learn, but spreading budget across thousands of SKUs starves individual products of the conversion signals they need.
At 5,000 SKUs, if you spend £50k/month, that's £10 per SKU per month. Most SKUs get zero clicks. The few that get traffic don't get enough conversions for Smart Bidding to optimise.
SKU sprawl isn't a catalogue problem. It's a structure problem. The solution isn't fewer products; it's smarter segmentation.
Retailers with 1,000+ SKUs typically find that 50-70% of products never get a single click in a given month. The algorithm is already making choices. You should control them.
Why It Happens
SKU sprawl typically results from:
Feed-First Thinking
"Everything in the feed goes to Google." This treats advertising as an extension of inventory rather than a strategic investment.
Agency Simplicity
One campaign is easier to manage than ten. Agencies with many clients default to simple structures that scale their operations, not your results.
Trust in Automation
"Smart Bidding will figure it out." It will, eventually, but the learning phase is expensive and the conclusions might not align with your commercial priorities.
Missing Commercial Data
Without margin data in the feed, there's no way to segment by profitability. All products look equal.
Symptoms of Sprawl
How do you know if SKU sprawl is affecting your account?
Warning Signs
- •60%+ of SKUs have zero impressions in the last 30 days
- •Top 20 products consume 80%+ of spend
- •Smart Bidding "limited by budget" despite adequate daily budget
- •New products never gain traction without manual intervention
- •Performance varies wildly by category but you can't control allocation
Segmentation Strategy
Effective segmentation prioritises commercial value over catalogue organisation. Categories are for merchandising. Margin tiers are for advertising.
Tier 1: Margin Drivers (Top 20%)
High-margin products with proven conversion history. These get aggressive bidding and majority budget share. POAS target: 2.5x+
Tier 2: Volume Builders (Middle 30%)
Medium-margin products that drive traffic and cross-sells. Moderate bidding, break-even acceptable. POAS target: 1.5-2x
Tier 3: Test/Watch (Next 30%)
Lower-margin or unproven products. Limited budget for testing. Promote to higher tiers based on performance. POAS target: Break-even minimum
Tier 4: Excluded (Bottom 20%)
Products that can't be profitably advertised. Low margin, no conversion history, out of season. Exclude from paid ads entirely.
The goal isn't to advertise everything. It's to concentrate spend where it generates the most profit. Exclusion is a valid strategy.
Custom Label Architecture
Google Merchant Center provides five custom labels for segmentation. Here's how to use them effectively:
Recommended Label Structure
Custom labels should update automatically based on your business systems. Margin changes, stock levels fluctuate, and performance evolves. Static labels quickly become obsolete.
Ongoing Governance
Large catalogue management isn't a one-time project. It requires ongoing governance:
Weekly: Performance Review
Check tier-level POAS. Identify products to promote or demote. Flag anomalies.
Monthly: Tier Rebalancing
Move products between tiers based on accumulated data. Update custom labels. Adjust budget allocation.
Quarterly: Structure Review
Assess whether the segmentation model still fits the business. New categories, margin changes, and seasonal shifts may require structural updates.
Frequently Asked Questions
How many SKUs is too many for one Google Ads campaign?
There's no hard limit, but complexity grows exponentially above 500 SKUs per campaign. At 5,000+ SKUs, a single campaign cannot effectively allocate budget. The algorithm needs segmentation to learn what works for different product types.
How should I segment a large product catalogue for Google Ads?
Segment by margin tier first (high, medium, low), then by commercial role (hero products, gateway products, clearance). Use custom labels in your product feed to enable this segmentation. Each segment gets campaigns with appropriate targets.
What is the 80/20 rule for SKU advertising?
Typically 20% of SKUs generate 80% of profit. Identify these products and ensure they receive proportionate (often majority) ad spend. The remaining 80% of SKUs need scrutiny, as many may not warrant advertising at all.
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