E-commerce SEO pricing isn't arbitrary. Every quote you receive reflects how much work your store actually requires. Understanding the cost drivers lets you evaluate proposals with a clear head — rather than defaulting to the lowest number.
Catalog Size and Page Volume
A store with 80 products and a clean structure is a fundamentally different project than a store with 4,000 SKUs across 200 category pages. More pages means more keyword research, more on-page optimization, more internal linking decisions, and more technical audit surface area. Agencies price accordingly.
Platform and Technical Complexity
Shopify, WooCommerce, and BigCommerce each carry platform-specific SEO issues. Shopify's canonical tag behavior, WooCommerce's plugin conflicts, and BigCommerce's URL structure all require different remediation strategies. If your store has faceted navigation (filtering by size, color, price), crawl budget management and duplicate content handling add meaningful hours to the project.
Competitive Landscape
A Shopify store selling specialty tea competes in a different environment than one selling consumer electronics or apparel. More competitive niches require more aggressive link acquisition, deeper content programs, and longer timelines. Agencies working in high-competition verticals need to price for that sustained effort.
Starting Authority
A brand-new domain with zero backlinks needs a different investment than a five-year-old store with existing rankings. If you're starting from scratch, expect the early months to focus heavily on technical foundation and content structure before you see meaningful traffic movement.
These four variables — catalog size, platform complexity, competition, and starting authority — explain most of the variation you'll see in e-commerce SEO quotes. When comparing proposals, ask how each agency has scoped these dimensions for your specific store.