Benefits of using an SEO agency can be:

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Advantages and disadvantages of using an SEO agency
Disadvantages of using an SEO agency can be:

A mascot points out the disadvantages of hiring an SEO agency
Amper sees obstacles everywhere

You may not have as good an overview of what is happening on your website.
Outsiders do not always have the same industry knowledge as employees in your company.
The services can be expensive, especially when the agency charges by the hour.
Errors may occur
Some use (black-hat) techniques that can lead to your website being penalized with lowered authority

You can achieve better results than you would samoa email list be able to on your own.
The cost you invest in SEO will often pay for itself over time
You can focus on tasks that your company is proficient in and avoid trainingA mascot points out the benefits of an SEO agency
Munter knows the most about SEO

You will be able to see what works and learn from it.
It is easier for an agency to achieve results with off-page SEO because they have a network of contacts that can be used to expose your company.
If you are going to start the process of creating a website, there will be less need to restructure the website afterwards.
It is easier to replace an SEO agency than an employee if needed.