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Why Missing Alt Text Sitewide Is an Easy, Overlooked Fix
Alt text is one of the few SEO details with zero downside and a real (if quiet) upside — the gap is almost always neglect, not disagreement.

Your audit checks alt text coverage across every page it crawls, not just the homepage — because that's exactly where the gap tends to open up. A homepage built with real care often has decent alt text; the service pages, galleries, and city pages added afterward frequently don't.
What alt text actually does
Alt text is a short written description attached to an image — read aloud by screen readers for visually impaired visitors, and used by Google Images to understand and index a photo it otherwise can't "see." For a contractor site, that mostly means: does Google Images know your before/after photo is a before/after epoxy garage floor photo, or is it just an anonymous file to a crawler?
Why it drops off past the homepage specifically
Homepage images are usually added deliberately, one at a time, by whoever built the site — alt text gets remembered. Gallery and service pages are often populated in bulk later (a batch upload of job photos, a plugin-generated grid) where alt text is the easiest field to skip under time pressure, and nobody circles back.
The upside is small per image, but it's free
Good alt text on a gallery of real before/after photos ("epoxy flake garage floor before and after, Fort Collins CO") gives Google Images a genuine chance to surface your work in image search results — a channel most competitors are neglecting for the exact same reason you might be. It costs nothing to add and never hurts anything to have.
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Related
FAQ
What should good alt text actually say?
A short, literal, specific description — the service, the material, and ideally the location. "Metallic epoxy garage floor, gray and blue swirl finish" beats "IMG_4821" or leaving it blank.
Does alt text directly boost my Google ranking?
Its direct effect is mainly on Google Images indexing and accessibility compliance — not a major direct ranking factor for regular search, but a real, free, zero-downside piece of the puzzle.