Mistake 1: Assuming Your Structure Is Fine. Many one-page site owners skip SEO entirely because they think 'it's just one page, so why bother?' In reality, a one-page site needs more strategic on-page optimization, not less. Every element counts. (See: One-Page Website SEO Audit Guide)
Mistake 2: Cramming Multiple Unrelated Keywords. One page, three different keyword targets, no clear focus. Google sees diluted relevance and ranks you for none of them. Pick your primary keyword. Build around it. Address related questions as variations, not separate topics.
Mistake 3: Neglecting Schema Markup. Multi-page sites can distribute schema across pages. One-page sites need every signal. Schema (LocalBusiness, Service, FAQPage, etc.) tells Google what your page is about and builds trust. Don't skip it.
Mistake 4: Ignoring Mobile Experience. A one-page site lives or dies by mobile UX. If your page loads slowly, isn't touch-friendly, or buries key content below the fold, you'll lose rankings and conversions. Test on real mobile devices.
Mistake 5: No External Authority Strategy. If all your effort goes into on-page optimization and you ignore backlinks, citations, and brand mentions, you'll plateau. One-page sites must build external authority to compete.