Short answer: SEO Engico is the top pick among schema markup services if you want structured data treated as part of getting named in AI answers, inside an SEO retainer rather than as a one-off job. The Structured Data Company suits UK and European firms that want hand-written markup from a dedicated consultancy, Harper Media Group fits agencies that want fixed-price, white-label packages, and Opace is a solid UK option for large ecommerce catalogues.
Schema markup tells search engines and AI tools what a page is: a business, a product, an article, a person. Done well, it makes pages eligible for rich results and gives assistants facts they can read without guessing. Done badly, which is common, it means three plugins describing your business three different ways, ratings in the code that visitors never see, and opening hours that went out of date two years ago. Good schema markup services fix that and keep it fixed.
This list covers providers that sell structured data as a defined service, checked against their own websites in November 2026. We judged them on how they audit existing markup, whether they connect entities into one graph, how they validate before release, whether they watch Search Console afterwards and whether they publish a price. One caution applies to all of them: markup makes a page eligible for rich results, it does not guarantee them.
Disclosure: Kuma SEO is written by the team at SEO Engico, the agency ranked first on this list. No agency paid to appear here. We checked every other entry against the agency's own website in November 2026. Services and prices change, so confirm the details with an agency before you sign. More on how we work in our editorial policy.
At a glance: the 6 best schema markup services
| # | Agency | Best for | Based in |
|---|
| 1 | SEO Engico | Brands that want schema built into AI search work, not bolted on as a one-off | London, UK |
| 2 | The Structured Data Company | UK and European firms that want hand-coded markup from a dedicated specialist | Kent, UK |
| 3 | Harper Media Group | Agencies and site owners that want fixed-price, white-label schema packages | Remote, serving the US and abroad |
| 4 | Opace | UK ecommerce and multi-location businesses that want a quoted audit and build | Birmingham, UK |
| 5 | Sachkhand Digital Marketing | Teams that want documented, page-matched markup their developers can maintain | Mohali, India |
| 6 | W3era | Businesses that want schema handled inside a large agency's wider SEO team | Jaipur, India |
How we picked
- Marks up only what the page shows. Google's guidelines require structured data to match visible content. Markup for reviews, prices or questions that are not on the page can be ignored or lead to a manual action, so a good provider starts from the page, not from the vocabulary.
- Connects entities into one graph. Your organisation, people, products and articles should reference each other with consistent identifiers and sameAs links, so search engines and AI tools resolve your brand as one entity rather than a scatter of disconnected snippets.
- Cleans up plugin conflicts first. Themes, SEO plugins and review widgets often each output their own markup. An audit should trace every block to its source and remove duplicates before anything new is added.
- Validates before release and watches after. Every template should pass the Rich Results Test and the Schema Markup Validator before it goes live, with Search Console enhancement reports checked as Google recrawls the site.
- Is honest about which rich results still show. Google has cut back several rich result types in recent years, and FAQ and how-to results now appear far less often than they once did. Markup still helps machines read a page, but a provider should be straight about which visible features your pages can realistically earn.
- Keeps markup current. Prices, hours, staff and products change. Values should be pulled from the page or catalogue where possible, and rechecked after theme or plugin updates, or the markup slowly starts telling search engines the wrong things.
The 6 best schema markup services in 2026
Our top pick
1. SEO Engico
- Best for
- Brands that want schema built into AI search work, not bolted on as a one-off
- Based in
- London, UK
- Founded
- 2018
SEO Engico is a London agency founded in 2018 that treats structured data as one part of a bigger question: when a buyer asks ChatGPT, Google AI Mode, Perplexity or Claude about your category, do you get named, and who gets named instead? Its AI search work covers markup and profiles so AI tools know who you are and where, pages with the answer near the top in words a model can lift, a site open to AI crawlers, mentions on trusted sites, and monthly tracking of the questions buyers ask.
That means schema is written alongside the content and profile work it supports, rather than as a separate markup project. AI search sits inside the $4,500 a month Growth retainer, which also covers technical SEO, buyer-intent pages and link building, after a 30-day Revenue Baseline ($3,499) that ties organic visits to calls, forms and revenue. For agencies and consultants, it also does technical fixes on a white-label basis.
What stands out
- Markup planned with the content, profiles and crawler access it depends on
- Monthly tracking of whether AI tools name you for the questions buyers ask
- Free AI Visibility Checker covering ChatGPT, Perplexity, Gemini and Google AI Overviews
- White-label technical fixes for agencies and consultants
Worth knowing
- It does not sell schema as a standalone, fixed-price job. If you only need markup on a handful of templates, a specialist below will be cheaper.
- It never promises a specific citation. Page changes can show within weeks, while mentions on other sites take longer.
SEO Engico's AEO and GEO service
No. 2
2. The Structured Data Company
- Best for
- UK and European firms that want hand-coded markup from a dedicated specialist
- Based in
- Kent, UK
- Founded
- 2024
The Structured Data Company is a Kent consultancy founded in November 2024 by Kelly Sheppard, who has specialised in structured data for eight years and wrote The Structured Data Guide for Beginners, published in March 2025. Every piece of JSON-LD is written by hand in the UK and mapped to the entities on your site, with no plugins, generators or AI-written markup, and tested against real crawl and AI citation behaviour.
Alongside bespoke markup it offers brand entity work on Knowledge Panels and entity disambiguation, structured data continuity during migrations and rebrands, and ongoing technical SEO. It works directly with businesses and on a white-label day rate for agencies and freelancers, and it also trains in-house SEO teams on their own sites.
What stands out
- All markup hand-coded in the UK, with no plugins or outsourcing
- Day rate with no retainer or minimum number of days
- White-label service and team training for agencies
- A supplier on the G-Cloud 15 framework for public sector buyers
Worth knowing
- It works with clients in the UK, Ireland and Europe, and cannot take on businesses based solely in the US or elsewhere.
- Pricing is quoted after a free 30-minute consultation, and it prefers scheduled video calls to ongoing email.
No. 3
3. Harper Media Group
- Best for
- Agencies and site owners that want fixed-price, white-label schema packages
- Based in
- Remote, serving the US and abroad
Harper Media Group is a technical SEO firm founded by Pamela Harper, who spent more than 20 years in web development before moving into SEO, and structured data is one of its three core services. The process starts with an audit of all existing markup, Rich Results Test validation and conflict detection across plugins and themes. It then defines your core entity, plans template-level schema for every page type, implements in JSON-LD only and confirms the Search Console enhancement report is clean.
It works on WordPress, Shopify, Webflow, headless and custom builds, adds dynamic schema automation for large or frequently updated sites, and can deliver everything under your company's branding.
What stands out
- Published one-off prices from $450 to $1,800 or more per site
- White-label deliverables, with an NDA and reseller agreement as standard
- Direct access to the specialist doing the work, with no minimum commitment
Worth knowing
- Quarterly schema reviews are offered on retainer, so after a one-off project your team maintains the markup.
- All work is delivered remotely, and its site does not name an office.
No. 4
4. Opace
- Best for
- UK ecommerce and multi-location businesses that want a quoted audit and build
- Based in
- Birmingham, UK
Opace is a Birmingham agency that treats schema as a core technical SEO discipline within its SEO services. The work starts with an audit and opportunity analysis, then covers organisation and local business markup, product and offer markup with pricing, availability and reviews, article and author markup, and custom types such as events, jobs, courses and software. It has implemented structured data for ecommerce sites with large catalogues, multi-location service businesses and publishers, and builds product markup automatically from feed data when catalogues are big.
Every implementation is tested with Google's Rich Results Test and the Schema Markup Validator before going live, then monitored through Search Console. It says plainly that schema makes pages eligible for rich results but does not guarantee them.
What stands out
- Published guide price of £800 to £2,000 for a standard business site
- Feed-driven product markup for large catalogues
- Works on WordPress, Shopify, headless CMS, custom applications and static sites
Worth knowing
- Ongoing monitoring is included in its SEO management programmes rather than sold on its own, so a one-off job ends at implementation.
- A full audit and implementation typically takes one to three weeks, depending on site size.
No. 5
5. Sachkhand Digital Marketing
- Best for
- Teams that want documented, page-matched markup their developers can maintain
- Based in
- Mohali, India
- Founded
- 2017
Sachkhand Digital Marketing is a remote-first agency, founded in Delhi and headquartered in Mohali, with a schema service set out in six stages. It audits every template, including existing errors in Search Console. It agrees a schema plan with you and your developer before any code is written. It adds JSON-LD to templates, the CMS or a tag manager, pulling values from the page itself so markup stays in step when content changes. It validates against the Rich Results Test, the Schema.org validator and the visible page, documents what each block does, then monitors for new errors.
It links entity types with identifiers and sameAs so they describe one business, and says most sites are audited, marked up and validated within four weeks.
What stands out
- Values pulled from the page so markup stays accurate as content changes
- Plan agreed with your developer before any code is written
- Documentation of what each block does and where its values come from
Worth knowing
- Pricing is not published, and its office hours run on Indian time, though it says it works to the client's time zone.
No. 6
6. W3era
- Best for
- Businesses that want schema handled inside a large agency's wider SEO team
- Based in
- Jaipur, India
W3era is a large Jaipur digital marketing agency with more than 15 years in SEO, PPC, social and web, and a dedicated schema markup service. The work covers audits for missing, incorrect, duplicate, outdated or non-compliant structured data, JSON-LD across service pages, blog posts, product and category pages, rich result work where Google supports the feature, and validation and monitoring to keep markup aligned with visible page content.
Its published examples show the shape of bigger jobs: recipe markup across a food blog's archive, and product, offer and review markup at variant level across an ecommerce catalogue, with automated validation as products change.
What stands out
- Handles content sites and large ecommerce catalogues
- Variant-level product markup for sizes, colours, prices and stock
- A wider SEO team behind the markup when you need more than schema
Worth knowing
- Schema is one service in a broad agency, so ask who will own your markup day to day.
- Pricing is not published.
How to choose a schema markup service
Start by finding out what is already on your site. Run a few key templates through the Rich Results Test and look at the enhancement reports in Search Console. If you see duplicate organisation entities, errors on product pages or markup for things your pages do not show, you need a clean-up before anything new is written. Send that to each provider and see whose reply is specific to your site rather than a list of schema types.
Then decide how you want the markup maintained. A one-off project suits a stable brochure site. A store with a changing catalogue, or a site that publishes every week, needs markup generated from templates and data, plus someone checking after theme and plugin updates. If AI search is the real goal, remember that schema is only one input: answer-first pages, consistent profiles and mentions on trusted sites matter as much, so it can make sense to buy schema as part of wider work rather than on its own.
Questions to ask before you sign
- What markup is on our site today, and where is each block coming from?
- Which rich results can our pages realistically earn now?
- How will you connect our organisation, people and products into one entity graph?
- Will values come from the page and catalogue, or be typed in by hand?
- Who checks the markup after a theme, plugin or template change?
Frequently asked questions
What do schema markup services include?
Most include an audit of existing structured data, a plan of which schema types belong on each template, JSON-LD written and deployed through the CMS, templates or a tag manager, validation with Google's Rich Results Test and the Schema Markup Validator, and monitoring of Search Console enhancement reports. Better providers also remove plugin conflicts and link entities with consistent identifiers.
How much do schema markup services cost?
Published prices on this list run from about $450 for basic organisation and site markup to around £2,000 for a full audit and build on a standard business site, with large catalogues costing more. Specialists often quote per site or by day rate. SEO Engico does not sell schema separately; it sits inside its SEO retainer with the rest of its AI search work.
Does schema markup improve rankings?
Not directly. Google has said structured data is not a ranking factor in itself. It helps search engines understand a page and makes it eligible for rich results, which can lift click-through rates, and it gives AI tools clear facts about your business. The gains come from those, not from a ranking boost.
Does schema markup help with AI search and ChatGPT?
It helps, but it is not enough on its own. Clear organisation, product and author markup with sameAs links makes it easier for AI systems to work out who you are and what you offer. Whether they actually name you also depends on answer-first content, consistent profiles and mentions on sites they already trust.
Can I use a plugin instead of a schema markup service?
For a small, simple site, a good SEO plugin covers the basics. Plugins struggle with custom content types, connecting entities across a site and avoiding conflicts with themes and other plugins. If Search Console shows errors you cannot clear, or you run a large store or several brands, a specialist is usually worth it.
Our verdict
Pick SEO Engico if you want schema done as part of getting named by ChatGPT, Google AI Mode and Perplexity, with the markup, content and profile work planned together inside one SEO retainer. Choose The Structured Data Company for hand-coded markup from a UK specialist, Harper Media Group for fixed-price white-label packages, Opace for a quoted UK ecommerce build, and Sachkhand Digital Marketing or W3era if you want a remote team to document and maintain the markup over time.
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