Written by: Ben Adams | September 12, 2026 |
If you lead marketing at a growth-stage B2B SaaS company, the choice between an SEO consultant vs an SEO agency usually shows up at a bad moment. Organic is flat, the board wants pipeline, and you do not have hours each week to manage a vendor. An SEO consultant is one senior person you hire directly, and an SEO agency is a team of specialists coordinated by an account manager.
A quick disclosure before we start: I run a fractional SEO practice, so I am one of the options in this comparison. I will lay out when each one fits, including when an agency is the better call, and you can weigh my view with that in mind.
The short version
- Two things decide it: who does the work once the contract is signed, and whether your team can act on a plan this quarter.
- Strategy only, and you have people who can execute? A consultant. Volume across several workstreams at once, or procurement needs a formal vendor? An agency.
- Both, and you do not want a full-time salary? A fractional consultant, meaning one senior person who sets the plan and does the work.
- Whichever you pick, ask who by name will do the work each week, what lands by the end of month two, and how they will earn you citations in AI answers.
The short answer
Two things decide it: who will do the work once the contract is signed, and whether your team can act on a plan this quarter. The answers usually point straight at one of three options.
- If you mainly need senior thinking and you have people to carry it out, hire a consultant.
- If you need a lot of hands across several workstreams at once, hire an agency.
- If you need the strategy and the execution from the same person, hire a fractional consultant.
The three options side by side
| Consultant | Agency | Fractional consultant | |
|---|---|---|---|
| What you buy | Senior judgment on what to target and why | A team and a process | Strategy and hands-on work from one senior person |
| Who does the day-to-day work | Your team or freelancers, following the consultant’s plan | Specialists coordinated by an account manager | The person who sold you the work |
| How it is priced | Hourly, by project, or a monthly retainer | Tiered monthly retainers that scale with scope | A monthly retainer for a set share of their time |
| Works best when | The problem is strategic and you can execute | You need high volume across several disciplines | You need the plan and the work, without a full-time hire |
| Strains when | You need heavy production on several fronts at once | You need senior attention on a narrow set of problems | The workload outgrows one person |
When a consultant fits
For a mostly strategic problem, one consultant can be enough: working out why rankings slipped, what to target next, or how the site should be structured, as long as you already have writers, a developer, or freelancers who can act on the plan. A consultant is one experienced person you hire directly, with nothing between you and the thinking. In the usual setup they advise and your team carries out the work. This is the freelance SEO route many lean teams try before an agency.
The limit is bandwidth. One person only has so many hours. If you need a content program, technical fixes, and design work all moving at the same time, a single consultant can become the bottleneck.
When an agency fits
If you have several workstreams to run and nobody internal to run them, an agency can move more at once than any one person. An agency gives you a team: strategists, writers, link builders, and sometimes developers, coordinated by an account manager. That is real throughput.
Here is the part that frustrates lean teams. The person who impressed you in the pitch often is not the one doing your work week to week, and you reach the team through an account manager. You also pay for that structure whether or not you use the full team in a given month.
I would still send you to an agency over me in a few cases: when you need high volume across several disciplines in parallel, like a large content program, link building, and technical fixes all at once; when you need guaranteed coverage and backup that one person cannot promise; or when procurement requires a larger vendor with formal processes and SLAs. If that is you, a good agency will serve you better than one consultant stretched thin.
When a fractional consultant fits
For a lean team that needs the plan and the hands, a fractional consultant is often the best fit. A fractional consultant is an experienced marketer who works part-time inside your team and does both jobs, setting the direction and doing the work. There is no account manager in between and no full-time salary. It is also how I work, so hold me to the same questions further down.
Why it matters who does the work
Some SEO problems only get solved by someone who can spot them and then see the fix through. At a media company where I led growth marketing, the flagship site ran on a JavaScript-rendered LMS platform that Google could not index properly, so almost nothing ranked. I traced the cause, worked with engineering on a pre-render fix so every page could be crawled, then built SEO practices across the site that grew leads 50 percent.
That took someone who could find the problem and stay with it until engineering shipped the fix. Whichever option you choose, make sure someone in it can do that.
Four questions to settle it
1. Who on your team can act on a plan this quarter? Look at who is actually free. If you have writers or a developer with time, you mainly need direction, and a consultant is efficient. If nobody has time and hiring is not an option, you need hands.
2. How many workstreams need to run at once? One senior person can carry one or two. Four or five in parallel usually means a team.
3. Who will manage the vendor each week? If the honest answer is “no one, really,” steer away from any setup that only works with close management.
4. Do they know your category? A learning platform, a transportation management system (TMS), and a healthcare product have different buyers, sales cycles, and search behavior. Ask for an example from your category, and ask how they tied search to pipeline. I work mainly with B2B SaaS companies in LMS and edtech, logistics and TMS, and healthcare.
Before you sign, ask any provider
- Who, by name, will do the work each week? If it is not the person across the table, meet the one it is.
- What will be done by the end of month two? A good answer names deliverables. A vague one tells you how the next six months will go.
- How will you earn us citations in AI answers? Searching is moving inside AI answers, and it is costing clicks: Pew Research Center tracked 68,879 Google searches in March 2025 and found people clicked a traditional result on 8 percent of visits where an AI summary appeared, against 15 percent where none did. A page that is not structured to be cited can lose visibility even when it ranks. This is answer engine optimization and generative engine optimization (AEO and GEO). If a provider cannot explain how they approach it, keep looking.
How I would decide
If your gap is thinking, hire a consultant. If it is volume across many hands, hire an agency. If it is both, and you want the person you hired to be the one doing the work, hire a fractional consultant. If you are still asking should I hire an SEO consultant or agency, the answer is wherever your real gap sits: strategy, hands, or both.
If you have worked through the questions and landed on both, that is the work I do. You can see how it works on my SEO consulting services page.
Frequently asked questions
What does an SEO consultant cost compared with an agency?
Agencies usually charge tiered monthly retainers that scale with scope, with part of the fee covering account management and coordination. Rates also vary by agency size, location, and services. Clutch, which draws on reviews from more than 65,000 SEO companies, puts typical agency retainers at $2,000 to $20,000 per month and the most common hourly band at $100 to $149 (Clutch, September 2026). Ahrefs surveyed 439 providers and puts the agency average at $98.90 per hour and $3,209 per month, against $171.18 per hour for consultants (Ahrefs, August 2024). A consultant carries less overhead, and that shows up at the top of the range rather than the bottom. Backlinko, surveying more than 300 SEO professionals, puts senior rates at $101 to $150 an hour and expert rates at $151 to $200 and up, with monthly retainers most often between $1,001 and $5,000 (Backlinko, December 2025). Hour for hour, a senior consultant can cost what an agency does. The gap is in the monthly ceiling, and in what you are paying for.
Can a consultant also do the execution?
Some do. When a consultant sets the strategy and does the hands-on work for a set share of your week, that is usually called fractional.
What is the difference between a fractional head of SEO and a consultant?
A fractional head of SEO joins part-time as your interim leader. They own the function, set priorities, and often manage the people doing the work. A consultant works on defined problems and does not run your team. The line blurs when a consultant works fractionally.
When should I move from a consultant to an agency, or back?
Move to an agency when the volume of work outgrows what one person can deliver across parallel workstreams. Move back to a consultant when you have people to execute and mainly need senior direction, or when working through an account manager is slowing you down.
Does either cover AEO and GEO?
Some do, many do not yet. Answer engine optimization and generative engine optimization (AEO and GEO) shape whether your pages get cited inside AI answers, not just ranked. Ask either a consultant or an agency to explain, in plain terms, how they structure content and data to earn those citations. If they cannot, treat it as a gap.