Cost Comparison
In-house SEO specialist: $60-120K salary plus benefits, tools ($500-2000/month), and training. Agency: $2-10K/month. For most SMBs, agencies offer more expertise per dollar.
Expertise and Resources
Agencies bring diverse experience across industries, established processes, and specialized tools. In-house hires know your business deeply but may lack broad SEO exposure.
Scalability
Agencies can scale efforts up or down quickly. In-house teams require hiring/firing decisions. If your needs fluctuate, agencies offer more flexibility.
When In-House Makes Sense
Consider in-house when: SEO is core to your business model, you need someone embedded in daily operations, you have budget for a senior-level hire plus tools.
When Agency Makes Sense
Consider an agency when: you need diverse expertise, want to start quickly, have variable needs, or can't afford a full-time senior SEO plus tools.
Hybrid Approach
Many companies use both: in-house coordinator managing agency relationships, or agency handling strategy while in-house executes content. This combines the best of both.