Google Ads Extensions: The Free CTR Boost Most Accounts Miss

Ad extensions (now called "assets") are the most underused free CTR boost in Google Ads. They expand your ad real estate, give users more reasons to click, and improve Quality Score. Most accounts have 2-3 extensions running where they could have 8-10.

Here's the full extension stack and how to use it.

What extensions do

Extensions add additional information beneath or beside your standard ad text:

• Sitelinks. Additional links to specific pages.
• Callouts. Short non-clickable phrases ("Free shipping," "30-day returns").
• Structured snippets. Lists of products or services.
• Price extensions. Display product/service pricing.
• Promotion extensions. Sale info with dates.
• Lead form extensions. In-ad lead capture.
• App extensions. Promote app downloads.
• Image extensions. Add product images to text ads.
• Location extensions. Show your address (for local businesses).
• Call extensions. Click-to-call phone number.

Each extension serves a different purpose. The most CTR-impactful: sitelinks, callouts, structured snippets, image extensions, and prices.

Sitelinks

Additional clickable links beneath your ad. Each takes users to a different page.

Best practices:

• Add 6-10 sitelinks per campaign. Google rotates which display.
• Include 1-2 sentence descriptions for each sitelink.
• Mix evergreen sitelinks (categories, About, Contact) with promotional (current sale, new arrivals).
• Each sitelink → highly relevant landing page.

CTR impact: 10-30% lift when sitelinks display.

Common sitelinks for e-commerce:

• "Best Sellers"
• "New Arrivals"
• "Customer Reviews"
• "Free Shipping Info"
• "Returns Policy"
• Specific categories ("Men's Boots," "Espresso Beans")

Callouts

Short text phrases (25 character max) without click-through.

Best practices:

• 6-10 callouts per campaign.
• Lead with most compelling.
• Update seasonally.
• Test callout performance — Google rotates which appear.

Common callouts:

• "Free Shipping on $75+"
• "30-Day Returns"
• "Trusted by 50,000+ Customers"
• "Family Owned Since 2015"
• "Award-Winning Customer Service"
• "100% Satisfaction Guarantee"

CTR impact: 5-15% lift.

Structured snippets

Headers with bulleted lists. Useful for showcasing range.

Best practices:

• Pick a header from Google's predefined list (e.g., "Brands," "Models," "Types," "Featured products").
• 3-10 values per header.
• Use multiple headers if relevant.

Examples:

• Header "Brands": Nike, Adidas, New Balance, Asics, Brooks.
• Header "Featured Products": Coffee Beans, Espresso Machines, Grinders, Cups.

Price extensions

Display specific products or services with prices.

Best practices:

• 3-8 items per campaign.
• Include actual prices (don't deceive).
• Update when prices change.
• Each item → relevant landing page.

Especially valuable for:

• E-commerce (multiple SKUs at varied price points).
• Service businesses (package pricing).
• Subscription products (monthly tiers).

Promotion extensions

Highlight sales with dates and offers.

Best practices:

• Use during actual promotions.
• Include start/end dates.
• Different versions for different promotions.
• Pause when promotion ends.

Examples:

• "20% off summer collection. Ends 8/31."
• "Buy one, get one 50% off."
• "Free shipping all weekend."

Image extensions

Add product/lifestyle images to text ads.

Best practices:

• 4+ high-quality images per campaign.
• Show products clearly.
• Test different angles or styles.
• Mobile-friendly composition.

CTR impact: significant on mobile, where image extensions dominate visual real estate.

Lead form extensions

Capture leads directly in the ad without sending users to a landing page.

Best practices:

• Use for lead-gen, not e-commerce.
• Keep form simple (name, email, phone).
• Clear value prop ("Download our free guide").
• Follow up fast — these leads are at the top of the funnel.

For service businesses or B2B: lead form extensions can dramatically lower CPL by removing landing page friction.

Call extensions

Click-to-call from the ad.

Best practices:

• Schedule for business hours.
• Track call conversions.
• Use for service businesses where calls are the primary conversion path.

For most e-commerce: skip call extensions. Customers prefer self-serve checkout.

Location extensions

Show address, link to Google Maps.

Best practices:

• For local businesses with physical presence.
• Link to Google Business Profile.
• Show distance to user.

For pure online retailers: skip.

App extensions

Promote app downloads.

Best practices:

• Only if you have a mobile app worth promoting.
• Track app installs as conversions.

Most direct-to-consumer brands don't have apps, so skip unless relevant.

Setting up extensions

In Google Ads → Ads & assets → Assets:

1. Create extensions at the account, campaign, or ad group level.
2. Account-level extensions apply to all campaigns by default.
3. Campaign-level overrides account-level.
4. Ad group-level is most specific.

Use account-level for evergreen (callouts, sitelinks for major sections). Campaign-level for category-specific. Ad group-level rare; usually unnecessary granularity.

How extensions display

Google chooses which extensions show based on:

• Predicted relevance to the query.
• Predicted CTR impact.
• Available ad real estate.
• Device type.

Mobile shows fewer extensions than desktop. Top-position ads show more extensions than lower-position ads.

You can't force a specific extension to show — Google decides.

Extension performance reporting

In Google Ads → Assets → individual extension reports:

• Impressions per extension.
• Clicks per extension.
• CTR per extension.

Use to identify low-performing extensions and replace them.

Extensions and Performance Max

PMax handles extensions differently:

• You provide assets (similar concept).
• Google generates ads dynamically.
• The "extensions" are mixed into the main ad creative.

For PMax: provide diverse assets and let the algorithm assemble ads.

Common extension mistakes

• Too few extensions. 2-3 sitelinks where there should be 8.
• Generic descriptions on sitelinks. Specific, value-loaded copy outperforms generic.
• Outdated promotion extensions. Sale ended last month, ad still shows it.
• Stretching a thin product line into 10 sitelinks. Better to have 4 strong sitelinks than 10 weak ones.
• Ignoring mobile extensions. Mobile has different extension display priorities.

A 1-hour extension audit

For an existing account:

• 15 min: List all current extensions.
• 15 min: Identify gaps. Compare to the full list above. What's missing?
• 20 min: Build missing extensions (sitelinks, callouts, structured snippets, prices).
• 10 min: Verify extensions are active across the right campaigns.

Most accounts find 20-40% CTR improvement from a complete extension stack.

What "good" looks like

A well-extended account:

• 8+ sitelinks per campaign with descriptions.
• 6+ callouts.
• 2+ structured snippets.
• Price extensions for catalog items.
• Image extensions where relevant.
• Promotion extensions during sales.
• Lead form extensions for lead-gen.
• Periodic refresh of all extensions.

Extensions don't replace good keywords or clean structure. They amplify both. Free CTR boost. Free Quality Score boost. Free conversion rate boost. The accounts that don't run them aren't being subtle — they're leaving money on the table.