Technical SEO services.Faster. Better. More.

Your business can’t enjoy on-page SEO success without a robust technical SEO foundation. As a technical SEO agency, we’re specialists in building a strong, bespoke technical SEO foundation for your website that is the key to SEO success.

Site speed optimisation

Faster sites are better sites. We speed up slow sites, clean bloated code and smash Core Web Vitals.

Technical SEO audits

We crawl your site to spot and fix errors – from broken links and 404s to missing alt tags and script errors.

Crawling and indexing

We tune your site for Google to crawl and index – from sitemaps and robots.txt to maxing crawl budgets.

Structured data & schema

Boost rankings with structured data resulting in richer search results and better SERPs positions.

Your website works hard. It needs to attract, engage and convert customers.

Our technical SEO services examine your site in forensic detail – including structure, speed, hosting, content, keywords, rendering and link quality. It's a great foundation to tackle problems that prevent your website from ranking highly.

It’s easy for technical issues to prevent your site from ranking. Nearly half of all customers expect a web page to load in less than two seconds. And if customers leave your site within five seconds, Google will drop your site down the search engine rankings.

Our approach gives your site a competitive edge. We conduct a technical on-site SEO audit, examining factors such as crawlability, site speed and mobile friendliness – important, as over half of all customers are more likely to purchase from a mobile-optimised site.

Our suite of industry-leading data and analytical tools delivers more traffic and more customers. Our comprehensive site SEO audit report gets beneath the skin of your site, helping support your future SEO strategy, SEO optimisation plan and content marketing approach.

SEMrush Agency Partner

We’re a fully Certified SEMrush Agency Partner – giving you a fast track to tried and tested SEO experts.

WP Engine Agency Partner

We’re a Certified WP Engine Agency Partner delivering professional SEO-ready web development at scale.

Cyber Essentials Certified

We’re Cyber Essentials certified and part of HMG’s Communication Marketplace for UK public procurement.

We work with brilliant brands

Site Speed Optimisation

At Submerge, we recognise that site speed is not just a technical metric but fundamental in delivering a brilliant user experience. Users demand immediacy, and a sluggish website can deter potential customers and harm your search engine rankings.

Our site speed optimisation service delves deep into your website’s infrastructure, refining code, optimising images and leveraging modern caching techniques. We also assess server performance and implement content delivery networks where needed. Our goal as a technical SEO agency is to ensure that every interaction with your site is seamless, reducing bounce rates and bolstering user satisfaction, all while positioning you exactly where you want to be in search engine results.

Technical SEO and Site Structure

A coherent site structure enhances user navigation and helps search engines crawl and index content efficiently, making it the blueprint for your online success.

Our site structure analysis delves into the hierarchy and organisation of your web pages. We examine URL structures, assess internal linking strategies and ensure logical categorisation of content for optimal usability. Streamlining the site’s layout can enhance user journeys and improve the discoverability of your content. The result? Better search engine rankings, ensuring your site reaches its target customers more effectively.

  • Build a strong internal link strategy.
  • Help users navigate your site.
  • Improve UX and accessibility.

Optimise Crawlability

Crawling and indexing are some of the foundational principles when it comes to SEO. These processes determine how search engines discover and store your website’s content.

Our technical SEO services ensure that search engines efficiently navigate your site, accessing all essential pages by optimising robots.txt files to guide crawlers, using comprehensive XML sitemaps for clearer content representation, and addressing crawl errors that may hinder visibility.

We position your content at the forefront, making it readily accessible to your target audience by ensuring a seamless crawl and effective indexing.

Schema Markup

Schema markup – a form of structured data – enables search engines to better understand the context of your content, leading to richer search results and increased click-through rates.

By implementing this SEO technique, we help search engines understand your content’s meaning, resulting in enriched featured snippets, knowledge graphs and other advanced features in search results to enhance your website’s presence in SERP.

Whether it’s for products, articles, events or local businesses, we tailor schema implementations to fit your needs, making your listings more informative and appealing to potential visitors.

  • Enhance your website’s presence in SERPs.
  • Produce more informative website listings.
  • Increase your content’s click-through rate.
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Our technical SEO agency services help your website get found, crawled by Google and ranked in search results.

We use industry-leading technical SEO tools to examine your website in detail. We examine crawlability, how Google ‘sees’ your site, mobile friendliness, broken links, site speed, security and page errors to get your website fighting fit.


Of active webpages do not have any backlinks to other sites.


The average number of Google searches made each day.


Percentage of Google searches made on mobile devices.


The percentage bounce rate increases for sites loading longer than 5 seconds.

“Submerge are SEO gurus – they go above and beyond.”

Julia Haycocks, Brew Republic Marketing Manager

Technical SEO is the backbone of a websites digital success.

We're Certified SEMrush Agency Partners and use enterprise-level technical SEO tools to analyse and optimise your site.

  • Enhance UX and page load speed.
  • Improve website crawlability.
  • Boost domain authority.

We optimise all technical SEO aspects of a site, making it more accessible and understandable to search engine crawlers.

This translates to improved indexing, ensuring that the SEO content hosted on your site reaches its intended audience.

A faster load time enhances user experience, reducing bounce rates, while mobile optimisation captures the growing number of users on handheld devices.

Essentially, technical SEO lays the groundwork for a site’s organic growth, bridging the gap between relevant content and its effective delivery to users.

Technical SEO – FAQs.

Choosing the right technical SEO agency is crucial for ensuring the long-term health and performance of your website.

Here are some steps to guide your decision:

Understand your needs: Before beginning your search, outline your website’s challenges and your objectives. Knowing what you need will help you gauge an agency’s expertise better.

Experience and specialisation: Look for agencies with a proven track record in technical SEO. Case studies and client testimonials can provide insights into their capabilities.

Ask about their process: A competent agency will have a structured approach to address technical SEO concerns, from site audits to implementation.

Communication and reporting: Ensure the agency provides regular updates, clear reporting and is responsive to your queries.

Tools and technologies: Find out which tools they utilize for technical audits, site monitoring and other tasks – familiarity with industry-standard tools is a good sign.

Continuous learning: SEO, especially the technical side, evolves rapidly. Ensure the agency stays updated with the latest trends and algorithm changes.

Cost vs. value: While pricing is essential, weigh it against the potential value the agency can bring. The cheapest option isn’t always the best.

Transparent practices: The agency should emphasise transparency and adhere to white-hat SEO techniques.

Technical SEO refers to the optimisation practices focused on improving the infrastructure of a website, ensuring it can be efficiently crawled and indexed by search engines.

Unlike other aspects of SEO, which revolve around content creation and promotion, technical SEO emphasises a site’s backend elements. This includes site speed optimisation, mobile-friendliness, secure and accessible website setups (like HTTPS), XML sitemaps generation, elimination of crawl errors, structured data implementation and website architecture enhancements.

By optimising these elements, technical SEO ensures that search engines can seamlessly access, interpret and index a site’s content, laying the foundation for better search visibility and user experience.

A technical SEO audit is an in-depth examination of a website’s technical infrastructure to identify and resolve issues that hinder its performance in search engine rankings. This process is crucial for enhancing the visibility, speed, and usability of a website, ensuring it can be easily crawled and indexed by search engines.

Here are some of the activities and tasks Submerge carries out as part of a technical SEO audit.

Crawl analysis

A comprehensive crawl of the website is performed using tools like Screaming Frog SEO Spider, Ahrefs or SEMrush. This analysis helps identify crawl errors, broken links, redirect chains, and orphan pages. It also assesses the site’s URL structure, ensuring it’s logical and search engine friendly.

Site structure

The audit examines the site’s hierarchy and structure, ensuring it is organized in a way that is logical and easy to navigate for both users and search engine bots. A well-structured website helps search engines understand the site’s content hierarchy and the relationship between pages.

Speed and performance optimisation

Page speed is a critical ranking factor. Tools such as Google PageSpeed Insights or GTmetrix are used to analyse the loading times of pages and identify factors that may be slowing the site down, such as unoptimised images, slow server response times and bulky code.

Mobile responsiveness

With the advent of mobile-first indexing, ensuring your website is mobile-friendly is non-negotiable. This part of the audit checks the site’s responsiveness across various devices and screen sizes, identifying any issues that might affect the user experience on mobile.


Security plays a significant role in the trustworthiness of a site. An audit will check for HTTPS implementation, secure data transmission and any potential security vulnerabilities that could compromise the website or user data.

On-page SEO evaluation

Though primarily technical, the audit also briefly touches on on-page elements to ensure proper use of tags (title, meta descriptions, headings), content quality, and keyword optimisation. It ensures that these elements are correctly implemented to support the site’s SEO strategy.

Indexation analysis

This involves checking the site’s index status on search engines to ensure that all important pages are being indexed properly and no unnecessary pages are consuming the crawl budget. It includes reviewing the robots.txt file, sitemap.xml files, and the use of noindex tags.

Duplicate Content and canonicalisation

The audit identifies duplicate content issues and ensures proper use of canonical tags to tell search engines which versions of similar pages should be considered the “master” pages. This prevents the dilution of ranking signals.

Structured data

Reviewing and implementing structured data ( helps search engines understand the content of your site and can enhance visibility in search results through rich snippets. The audit checks for the correct implementation of structured data.

Link health analysis

Examines the health and quality of internal and external links, identifying broken links, improper redirects, and opportunities to improve the internal linking structure to distribute page authority throughout the site.


The culmination of a technical SEO audit is a detailed report highlighting the findings, including issues impacting the site’s performance and specific recommendations for resolving these issues. Our report serves as a roadmap for making technical optimisations that can significantly improve the site’s SEO performance.

Our team performs regular technical SEO audits to ensure that your website remains compliant with search engine guidelines, is competitive in the ever-evolving landscape of SEO and provides a superior experience to its users.

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