Yes, schema markup is a standard part of technical SEO work, and most SEO companies that offer technical services are equipped to handle it. The relevant question is not whether a company can touch schema, but how thoroughly it implements, tests, and maintains it. This answer explains what the work involves so you know what to expect.
What schema markup is
Schema markup, also called structured data, is code added to a web page that describes the page content in a format search engines can read directly. Instead of leaving a search engine to infer that a page is about a product, an article, or a local business, structured data states it plainly. The shared vocabulary comes from Schema.org, a collaborative standard, and Google recommends the JSON-LD format, which places the markup in a script tag in the page source rather than mixing it into visible HTML.
The purpose is to help search engines and, increasingly, AI-driven search features understand the entities on a page and the relationships between them. Accurate structured data can make a page eligible for richer search listings and supports how systems verify and cite content.
Common schema types
The types an SEO company applies depend on what your site actually publishes. Common examples include Organization and LocalBusiness for company information, Product for ecommerce pages, Article for editorial content, Event for scheduled activities, BreadcrumbList for navigation paths, and Review or AggregateRating where genuine ratings exist. Schema.org defines hundreds of types, but a competent provider will only use the ones that match real content on the page.
This restraint matters. Google has tightened eligibility for several schema types over time, and markup that describes content the page does not contain can be ignored or treated as a quality problem. A reputable SEO company will not add Review or FAQ markup simply to chase a richer listing if the underlying content does not support it.
How an SEO company implements it
Implementation usually begins with an audit of the site’s current structured data, including any markup already present that is incomplete or incorrect. The company then maps the appropriate schema types to your page templates. Because most sites are template-driven, schema is often added at the template level so that, for example, every product page generates Product markup automatically rather than being hand-coded one page at a time.
The markup is then either written directly into the site code, added through a content management system feature, or deployed with a plugin or tag manager, depending on your platform. Required and recommended properties for each type are filled with accurate data drawn from the page itself.
Validation and ongoing work
Schema work is not finished when the code is deployed. An SEO company should validate it using two kinds of tools. Google’s Rich Results Test confirms whether a page is eligible for specific search features, while the Schema.org Schema Markup Validator checks whether the markup is syntactically correct against the standard. Code can be valid yet still not qualify for a rich result, so both checks have value.
After deployment, the company monitors structured data reports in Google Search Console for errors and warnings, and revisits the markup when page templates change or when search engines update their requirements. Treating schema as a one-time task is a common shortcoming, so it is reasonable to ask a prospective provider how they handle ongoing validation and maintenance.
What to ask
When evaluating an SEO company on this capability, ask which schema types they would apply to your specific site and why, how they implement markup across templates, which validation tools they use, and how they monitor for errors over time. Clear answers indicate the company treats structured data as accurate, maintained code rather than a checkbox.