Storage Units: AI Visibility Market Discovery Index

Benchmark Summary

Questions This Section Answers

• Which brand leads the Storage Units benchmark in October 2026, and how wide is the gap to second place?
• Which brands moved beyond normal month-to-month variation this month?
• How did the leading brands' coverage change from the July 2026 baseline?

Extra Space Storage leads the Storage Units benchmark in October 2026 with valid recommendation coverage of 39.0%, ahead of Public Storage at 36.4%, a gap of 2.6 points between the two leaders. Extra Space Storage's figure rose from 29.5% in July 2026, and Public Storage's rose from 26.1% in July 2026.

The largest coverage increase this month belonged to Extra Space Storage, rising to 39.0% in October 2026 from 28.9% in September 2026, a month-over-month gain that exceeded normal variation. Life Storage's coverage also declined versus its July 2026 baseline, falling from 5.1% to 1.6%, though its September-to-October change of 0.9 points stayed within normal month-to-month variation. Three brands moved beyond normal month-to-month variation in October 2026: Extra Space Storage, Prime Storage, and Public Storage all rose.

Across the full July-to-October series, movements were mixed. Extra Space Storage finished 9.5 points above its July 2026 baseline, while Public Storage finished 10.3 points above baseline and Prime Storage finished 5.2 points above baseline, climbing in each of the three months since July 2026. Life Storage declined from 5.1% in July 2026 to 1.6% in October 2026, a drop of 3.5 points.

The benchmark began with 800 prompt-surface observations in each month and produced 579 qualified observations in October 2026 as the public denominator.

Current Benchmark at a Glance

Qualified surface breadth counts the six canonical AI/search surface families with at least one qualified observation: ChatGPT, Copilot, Gemini, Perplexity, AI Overviews, and AI Mode. August 2026 and September 2026 sat between the baseline and current months; the qualified observation count peaked at 636 in September 2026 before easing to 579 in October 2026.

For the strategic interpretation of this benchmark, read CiteWorks Studio's analysis of How AI Search Is Recommending Storage Units

Research Scope and Qualification

The public benchmark is narrower than the raw collection universe by design.

Brand-level percentages use the qualified observations as the public denominator, not the raw collection. See the AI Visibility Market Discovery Methodology for the full qualification rules.

Current Brand Standings

Questions This Section Answers

• Which storage brands lead on recommendation coverage, and how far ahead are they?
• How do the smaller brands like SmartStop and StorageMart compare on presence versus valid recommendation coverage?
• Why does SmartStop's favorable sentiment not translate into a higher recommendation position?

How to Read the Standings

• Presence rate: share of qualified observations where the brand appears anywhere in the AI answer.
• Valid recommendation coverage: share of qualified observations where the brand appears in a valid recommendation shortlist.
• Top-three rate: share of qualified observations where the brand appears among the top three recommendations.
• Rank-one rate: share of qualified observations where the brand is the single first recommendation.
• Net sentiment: positive minus negative mention tone across the brand's mentions, scaled to a 0 to 1 range.

For formulas and denominator rules, see AI Visibility Market Discovery Metric Definitions.

Recommendation Coverage Movement

Questions This Section Answers

• Which storage brands posted the largest coverage gains since the July 2026 baseline?
• Where did Life Storage lose the most recommendation coverage, and what happened to its presence rate?
• How does SmartStop's coverage movement compare with the category leaders?

Between September and October 2026, several brands recorded their largest single-month move of the series. Extra Space Storage rose 10.1 points, Public Storage rose 9.8 points, CubeSmart rose 6.9 points, and U-Haul rose 6.4 points. Prime Storage extended its streak of monthly gains to three, and SmartStop rose 4.2 points.

Largest Increase: Extra Space Storage

Extra Space Storage's valid recommendation coverage rose to 39.0% in October 2026 from 29.5% in July 2026, a gain of 9.5 points. The move from September to October 2026 was 10.1 points, the brand's largest single month this series. Public Storage and Prime Storage also rose beyond normal month-to-month variation, at 36.4% and 7.6% respectively.

Largest Decline: Life Storage

Life Storage's valid recommendation coverage fell to 1.6% in October 2026 from 5.1% in July 2026, a decline of 3.5 points, the largest cumulative decline in the category. The brand's presence rate fell to 7.2% from 11.6% over the same window. National Storage Affiliates finished at 0.4% in October 2026, down from 1.0% in July 2026, after registering no valid recommendations in September 2026.

Category Leader: Extra Space Storage

Extra Space Storage holds the top position on valid recommendation coverage at 39.0% in October 2026, up from 29.5% in July 2026, maintaining the lead it has held across the series. Its top-three rate rose to 33.5% in October 2026 from 23.3% in July 2026, and its presence rate held at 97.2%, essentially unchanged from 96.8% in July 2026.

SmartStop: Competitive Position

SmartStop enters October 2026 with a presence rate of 15.0% and valid recommendation coverage of 9.2%, up from 8.2% in July 2026, a gain of 1.0 point across the series. Its top-three rate stands at 5.7% and its rank-one rate at 2.8%. Net sentiment of 0.7 is the highest among all ten tracked brands, meaning that when SmartStop is mentioned, the tone of that mention is favorable more often than for any competitor in the category.

Extra Space Storage records 39.0% on valid recommendation coverage, while SmartStop stands at 9.2%, a clear recommendation gap of 29.8 points. The more important issue is what that gap means for SmartStop's recommendation position: a presence rate of 15.0% shows the brand is already appearing in a meaningful share of AI answers, but only 9.2% of qualified observations convert that presence into a valid recommendation, and just 2.8% place SmartStop first. Extra Space Storage and Public Storage together hold 75.4% of valid recommendation coverage in this category, leaving a narrow, contested remainder that SmartStop currently shares with seven other brands. Favorable sentiment alone is not closing this gap, and the cost of leaving it unexamined is continued absence from the shortlists that buyers see first.

Highest-priority diagnostic: What specific content, citation, or positioning factors are preventing SmartStop's presence from converting into valid recommendation coverage at a rate closer to the category leaders?

Recommendation Placement Snapshot

Questions This Section Answers

• How do rank-one rates differ between Extra Space Storage and Public Storage despite similar coverage?
• Which leading storage brands convert coverage into first-position recommendations most often?

Coverage shows where a brand appears in a shortlist, but placement shows how prominently it is recommended. Among the three leading brands by coverage, first-position rates diverged in October 2026.

Extra Space Storage and Public Storage sat within 2.6 points of each other on coverage in October 2026, yet Extra Space Storage's rank-one rate of 18.6% stood nearly double Public Storage's 10.0%. Similar coverage levels can still hide substantially different first-position rates across brands.

Buyer-Intent Distribution

Questions This Section Answers

• Which buyer-intent classes does the current public series actually measure?
• Which storage search intents are not yet represented in the qualified sample?

All qualified observations in July through October 2026 fell into the Brand Recommendation class, which captures discovery and consideration queries where a user seeks a brand to meet a stated need.

The current public series measures Brand Recommendation discovery only. The qualified sample does not yet contain observations in the Pricing & Value or Multi-Brand Comparison classes.

Historical Measurement Record

Questions This Section Answers

• Has the coverage leader changed across the July-to-October 2026 measurements?
• Which month recorded the largest coverage movement in the series?

This is an evergreen benchmark URL. New measurements are added to the same report.

Top 10 Cited Domains

Questions This Section Answers

• Which domains are cited most often across AI platform responses in this Storage Units measurement?
• How much of total citation volume is concentrated in the top three domains?
• Which tracked storage brands have their own domains in the top ten cited sources?

Across all AI platform responses in this measurement period, 7,404 citations were observed across 855 unique domains.

Citations are concentrated at the top of the list: the first three domains account for 40.1% of all citations, and the ten domains shown account for 54.9%. Four tracked brands have their own domains in the top ten: extraspace.com, publicstorage.com, uhaul.com, and cubesmart.com. Beyond those brand properties, the list is dominated by storage-focused listing and comparison resources such as sparefoot.com, rentcafe.com, and storagecafe.com, alongside google.com and youtube.com.

Evidence and Source Layer

Questions This Section Answers

• What evidence does each prompt-level observation retain?
• Does a cited source prove it caused the brand recommendation?

The benchmark is built from prompt-level observations that retain the query, AI/search surface, answer, brand outcome, recommendation placement, sentiment, and, where exposed, citations or attributable evidence sources. Source presence is evidence about the information environment. It is not automatically proof that the source caused the recommendation.

Scope Boundaries

This public benchmark does not measure market share, attributable sales, every possible AI response, organic-search ranking, social mention volume, private or sponsored channels, or causality from a metric movement alone. It records where brands appear in AI-generated discovery responses across the six canonical surface families.

About This Benchmark

The LLM Authority Index AI Visibility Market Discovery Index tracks how often brands appear and are recommended across six major AI and search surface families. It is a neutral, industry-level measurement built from a defined prompt set and a transparent qualification process.

• AI Visibility Market Discovery Methodology
• AI Visibility Market Discovery Metric Definitions
• AI Visibility Market Discovery Research Standards
• Modeled AI Visibility Authority Value

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