Technical SEO plays a critical role in how search engines discover, crawl and understand your website.
While blogs and backlinks often receive much of the attention, even the best content can struggle to perform if technical issues prevent search engines from accessing or interpreting it correctly.
As websites become more complex and Google’s expectations seemingly change, many businesses face an important question; should technical SEO be managed in-house, or is it time to bring in specialist external support?
The answer depends on several factors, including the size of your website, the expertise available within your team and the challenges you’re trying to solve.
In this guide, we’ll explore the strengths of both approaches and explain when partnering with a technical SEO agency can provide additional value.
What is technical SEO?
Before comparing in-house and agency support, it’s important to understand what technical SEO actually involves.
Technical SEO focuses on the elements of a website that help search engines crawl, index and understand content efficiently.
While content optimisation and keyword targeting remain critical parts of SEO, technical SEO ensures the foundations of your website support long-term organic growth.
Technical SEO can include:
- Site architecture and navigation
- XML sitemaps
- Crawlability and indexation
- Internal linking
- Redirect management
- Structured data markup
- Core Web Vitals and page performance
- Mobile usability
- Canonicalisation
- International SEO implementation
- JavaScript SEO
- Website migrations
Many technical issues aren’t immediately visible to website users. A page may appear perfectly functional while search engines struggle to access, interpret or prioritise it correctly.
This is why technical SEO often requires specialist knowledge, tools and experience.
The potential benefits of in-house SEO
For some organisations, having SEO expertise within the business can offer practical benefits.
An in-house SEO professional or team works closely with colleagues across marketing, product, development and leadership teams. This can help SEO considerations become embedded within wider business activities and make collaboration on projects more straightforward.
Internal teams may also have regular visibility of business priorities, such as:
- Seasonal trends
- Product launches
- Internal processes
- Sales priorities
- Customer pain points
This familiarity can help inform SEO planning and prioritisation, particularly when search is closely integrated with broader marketing and commercial activity.
You may find it easier to collaborate internally
Technical SEO recommendations often require collaboration between developers, designers, content teams and senior stakeholders.
Having an SEO professional embedded within the business can make it easier to build relationships with these teams and encourage SEO considerations to be included in wider projects from the outset.
In some cases, this can help streamline communication and reduce delays when implementing recommendations.
You may have greater flexibility over priorities
Business priorities rarely stay the same for long. An in-house SEO professional can often adapt their focus quickly when new opportunities, challenges or campaigns arise. Whether supporting a product launch, responding to market changes or assisting another department, internal resources can provide a degree of flexibility that some businesses value.
Of course, this flexibility will depend on workload, available resources and the wider responsibilities of the individual involved.
Why building an effective in-house SEO team is difficult
Technical SEO today extends far beyond basic optimisation tasks. Modern websites are increasingly complex, and the team at Google are always changing their expectations around performance, crawlability and user experience.
Businesses must now consider factors like:
- Core Web Vitals
- Mobile-first indexing
- Structured data implementation
- Crawl efficiency
- JavaScript rendering
- International SEO
- AI-driven search developments
At the same time, websites themselves often rely on complex technologies like:
- JavaScript frameworks
- Headless CMS platforms
- Ecommerce platforms
- Dynamic content rendering
- Multi-site and international architectures
Keeping pace with these developments requires continuous learning and hands-on experience across a wide range of technical disciplines; something that in-house teams might take time to get to grips with.
Finding the right skills can be challenging
One of the biggest obstacles businesses face is recruitment. Technical SEO specialists (or a team that can handle any potential problems and issues) are relatively rare. Those with experience across areas like technical audits, website migrations, analytics, site architecture and performance optimisation are often in high demand.
As a result, businesses are frequently faced with three options:
- Hire a generalist SEO professional
- Recruit multiple specialists
- Seek support from an external agency
The challenge is that technical SEO rarely exists in isolation.
A successful SEO programme may require expertise in technical SEO, content strategy, digital PR, analytics and conversion optimisation. Building a team that covers all these areas can require a substantial investment of both time and budget.
The hidden cost of building an SEO team
Hiring an SEO professional is one thing. Building a team with expertise across technical SEO, content strategy, digital PR, analytics and conversion optimisation is a different beast entirely.
Beyond salaries, businesses also need to consider recruitment costs, training, SEO software subscriptions and ongoing professional development. These investments can quickly add up, particularly when specialist technical SEO skills are involved.
For larger organisations, building an in-house SEO function may be the right long-term strategy. However, for many businesses, partnering with an agency provides access to a broader range of expertise without the time, cost and commitment involved in assembling a dedicated team from scratch.
Instead of relying on a single hire, businesses gain access to specialists across multiple SEO disciplines, often at a fraction of the cost of building the same level of expertise internally.
See a comparison of the hidden costs here:
| Cost consideration | In-house SEO team | SEO agency | Hybrid model |
| Recruitment and onboarding | High upfront cost, particularly when hiring several specialists | Usually included within the agreed fee | Lower than building a complete team internally |
| Salaries and employment costs | Ongoing salaries, pensions, National Insurance, benefits and training | Fixed monthly retainer or project fee | Internal salary costs plus a smaller agency fee |
| SEO tools and software | Paid directly by the business and potentially required across several disciplines | Specialist tools are normally included within the service | Core tools may be held internally, with specialist agency tools used when needed |
| Access to specialist expertise | May require several hires to cover technical SEO, content, digital PR and analytics | Access to a broader team without hiring each role individually | Internal knowledge is supported by external specialists |
| Ability to scale resource | Dependent on recruitment and existing team capacity | Resource can often be increased or reduced more quickly | Flexible, with the agency providing additional capacity during demanding periods |
| Best suited to | Larger organisations with consistent, long-term SEO requirements | Businesses needing specialist expertise, flexibility or faster access to resource | Businesses with an internal marketing team that needs additional expertise or delivery support |
Experience is difficult to replicate
Another important consideration is exposure. An in-house SEO professional may spend years working on a single website, industry or platform. While this creates valuable business knowledge, it can limit exposure to the wide range of technical challenges encountered across the wider search landscape.
Technical SEO agencies often work across:
- Lead generation websites
- Enterprise organisations
- International websites
This breadth of experience allows agencies to spot recurring issues, identify opportunities more quickly and solve issues that they’ve already seen countless times.
For many businesses, this collective experience is one of the biggest advantages of partnering with a specialist technical SEO agency. Rather than relying on the knowledge of a single individual, they gain access to a wider team of specialists with experience solving a broad range of technical SEO challenges.
When a technical SEO agency adds the most value
There are certain situations where external expertise can have a particularly significant impact.
During website migrations
Website migrations are among the highest-risk SEO projects a business can undertake.
Whether you’re changing domains, redesigning your website, moving to a new CMS or rejigging an ecommerce store, even small mistakes can result in significant traffic and ranking losses.
A specialist technical SEO agency can help identify risks, plan redirects, preserve organic visibility and monitor performance before, during and after launch.
When organic growth has plateaued
If rankings and traffic have stopped improving despite ongoing content creation and optimisation efforts, technical issues may be limiting performance.
Common causes include:
- Crawl inefficiencies
- Weak internal linking structures
- Duplicate content
- Indexation issues
- Rendering problems
Technical SEO specialists can often uncover opportunities that standard reporting may overlook.
When your website is large or complex
As websites grow, technical SEO becomes increasingly important.
Large ecommerce websites, franchise networks, enterprise platforms and international websites often introduce challenges that require specialist expertise.
Managing thousands of pages, multiple website sections or complex site structures can quickly become difficult without dedicated technical SEO support.
When you need a specialist resource without expanding headcount
Many businesses understand the importance of technical SEO, but don’t necessarily need a full-time specialist.
Working with an agency allows businesses to access experienced consultants as and when required, whether for a technical audit, migration, recovery project or ongoing support.
When should you switch from in-house technical SEO to an agency?
Moving from an in-house approach to agency support does not necessarily mean replacing your internal team. In many cases, it means recognising that the website has reached a level of complexity or ambition that requires additional expertise.
It may be time to involve a technical SEO agency when:
- Your internal team is consistently working at full capacity
- Technical issues remain unresolved because specialist knowledge is unavailable
- Organic performance has plateaued despite continued investment in content
- A migration, redesign or CMS change creates risks beyond the team’s experience
- SEO projects are repeatedly delayed by competing internal priorities
- The business needs clearer reporting, prioritisation or accountability
- Recruiting the necessary specialists would take too long or cost too much
An agency can supplement the knowledge already held internally, provide an independent assessment of performance and help the business move forward without waiting for permanent hires.
Should you choose in-house SEO, an agency or a hybrid model?
There is no single approach that suits every business. The right model depends on your internal expertise, website complexity, growth plans and available budget.
Choose an in-house SEO team if:
- SEO is a continuous priority across a large or complex organisation
- You need someone embedded closely within product, marketing and development teams
- There is enough ongoing work to justify several permanent specialist roles
- The business is prepared to invest in recruitment, tools and professional development
An internal team can build extensive knowledge of the organisation, its customers and its commercial priorities. However, one employee is unlikely to provide advanced expertise across every area of SEO.
Choose an SEO agency if:
- You need access to several specialists without building a full team
- A technical project requires expertise that is not available internally
- You want to increase delivery capacity without expanding permanent headcount
- Organic performance has stalled and an independent perspective is needed
- You need support with a migration, technical audit, recovery project or growth strategy.
An agency can provide technical, strategic and analytical expertise through one relationship, with resource adjusted around the needs of the project.
Choose a hybrid model if:
- You already have an internal SEO or marketing team but need specialist support
- Your team can manage everyday activity but lacks capacity for larger projects
- You want to retain internal ownership while gaining access to external expertise
- SEO requirements fluctuate throughout the year
- You need an agency to provide technical guidance, quality assurance or additional delivery resource
The hybrid model often gives businesses the strongest balance between internal knowledge and external capability. The in-house team remains close to the organisation, while the agency provides specialist expertise, additional capacity and an outside perspective.
How MRS Digital can help
Whether you have an established in-house SEO team or you’re looking for specialist support on a technical SEO project, MRS Digital can help identify and resolve the issues that may be limiting your website’s performance.
We take a proactive approach to campaign management, with consistent communication, straightforward reporting and a clear point of contact throughout. This lets us spot any issues early and helps recommendations to be prioritised and progress to remain visible at every stage.
Our team works with businesses across a wide range of sectors, providing technical SEO, AI SEO and PPC services that support long-term organic growth. From comprehensive technical audits and website migrations to ongoing optimisation and consultancy, we help businesses uncover opportunities, prioritise improvements and implement changes with confidence.
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