Hiring an SEO agency can be one of the most important marketing decisions a business makes.

It can also be one of the easiest to get wrong.

Most agencies will tell you they can improve rankings.

Many will show case studies.

Some will promise traffic growth.

Others will talk about backlinks, keywords, content or technical audits.

But those things alone do not tell you whether an agency is actually right for your business.

SEO has changed significantly.

Traditional rankings still matter, but search is increasingly influenced by AI-generated answers, answer engines, entity understanding and broader brand authority. Zero Theory's current positioning reflects this evolution, combining SEO with GEO and AEO rather than treating search as a purely traditional ranking exercise.

That means choosing an SEO agency in 2026 requires better questions.

You need to understand:

• How they think
• How they measure success
• How they approach technical SEO
• How they build authority
• How they handle content
• Whether they understand your commercial goals
• Whether they can adapt to AI search

Here are 15 questions worth asking before signing an SEO contract.

What Would You Do First If You Took Over Our SEO?

This is one of the best questions you can ask.

You are testing how the agency thinks.

A strong agency should not immediately respond with:

"100 backlinks."

or

"We need 50 blogs."

Instead, they should want to understand:

• Current organic performance
• Technical health
• Indexation
• Search intent
• Existing content
• Competitors
• Commercial pages
• Conversion rates
• Brand authority

The first step should be diagnosis.

How Do You Define SEO Success?

If the answer is simply:

"Higher rankings."

keep asking.

Rankings matter, but they are not the final business outcome.

Depending on your business, better KPIs may include:

• Qualified organic traffic
• Organic leads
• Pipeline
• Revenue
• Conversion rate
• Non-brand visibility
• Commercial keyword growth
• AI search visibility

An SEO agency should understand the connection between search visibility and business outcomes.

What Will You Measure Every Month?

Ask for actual reporting metrics.

A useful SEO dashboard might include:

• Organic clicks
• Impressions
• CTR
• Average position
• Indexed pages
• Keyword visibility
• Organic conversions
• Top landing pages
• Technical issues
• Backlink growth
• Commercial keyword performance

For modern search, you can also ask whether they measure:

• AI citations
• AI mentions
• Share of AI visibility
• Brand appearance for buyer prompts

Zero Theory's own GEO content argues that AI visibility should be measured through defined buyer prompts rather than vague "AI visibility" claims.

How Do You Approach Technical SEO?

Technical SEO should go beyond a generic audit.

Ask whether they will review:

• Crawlability
• Indexation
• Robots.txt
• XML sitemap
• Canonicals
• Redirects
• Status codes
• JavaScript rendering
• Internal linking
• Structured data
• Core Web Vitals
• Duplicate content

If your website is built using a JavaScript framework, ask specifically how the agency handles rendering and indexability.

How Do You Decide Which Keywords to Target?

This question exposes whether the agency thinks strategically.

Keyword selection should consider:

• Search intent
• Commercial relevance
• Competition
• Search demand
• Existing authority
• Conversion potential
• Topic relevance

A keyword with 20,000 monthly searches isn't necessarily better than one with 500 searches if the smaller keyword attracts buyers.

The goal isn't maximum traffic. The goal is useful visibility.

How Do You Build a Content Strategy?

Ask the agency to explain how they move from keywords to content.

A strong strategy should consider:

Topic → Search intent → Buyer stage → Content format → Internal links → Conversion path

You should also ask:

• Who writes the content?
• Who reviews it?
• How is expertise demonstrated?
• How are existing pages improved?
• How do you avoid content cannibalization?

Publishing more articles is not automatically an SEO strategy.

How Do You Handle Existing Content?

This is often overlooked.

Before creating hundreds of new pages, an agency should determine:

• Which pages already perform
• Which pages are declining
• Which pages overlap
• Which pages need consolidation
• Which pages need updating
• Which pages should be removed

Sometimes the fastest SEO improvement comes from improving existing assets rather than publishing another article.

What Is Your Link-Building Strategy?

Do not accept:

"We will build 100 backlinks per month."

Ask:

• From where?
• Why those websites?
• How relevant are they?
• What is the editorial process?
• Are links placed naturally?
• How do you assess quality?
• What happens if a link is removed?

The number of backlinks alone says very little.

A smaller number of relevant, authoritative mentions can be more valuable than hundreds of low-quality links.

Do You Use Guest Posts or Paid Links?

Ask directly. You want to understand exactly how links are acquired.

The agency should be transparent about:

• Outreach
• Editorial placements
• Partnerships
• Digital PR
• Content-led link acquisition

If the agency refuses to explain its process, that is a warning sign.

How Do You Approach GEO and AEO?

This question is particularly important in 2026. SEO is no longer the complete search visibility conversation.

Ask:

"How will you help our brand appear in AI-generated answers?"

A credible answer should involve concepts such as:

• Answer-focused content
• Entity consistency
• Topical authority
• Structured information
• Original evidence
• Third-party mentions
• Technical accessibility
• Prompt-level measurement

Zero Theory distinguishes SEO, AEO and GEO rather than treating them as interchangeable terms. That is an important distinction when evaluating agencies.

Can You Show Me a Real Case Study Similar to Our Business?

Don't only ask for the biggest success story. Ask for a case study that resembles your situation.

For example:

• Same industry
• Similar website size
• Similar competition
• Similar business model
• Similar geography
• Similar sales cycle

Then ask:

• What did you actually change?
• How long did it take?
• What was the baseline?
• What happened after work?

This helps separate genuine experience from generic marketing claims.

Who Will Actually Work on My Account?

This question is extremely important. The person selling the engagement may not be the person executing it.

Ask:

• Who owns the strategy?
• Who handles technical SEO?
• Who writes content?
• Who manages outreach?
• Who reports performance?
• How involved is the senior team?

You want to know who is actually responsible for the work.

How Long Before We Should Expect Results?

Be suspicious of guaranteed timelines.

SEO outcomes depend on:

• Existing authority
• Competition
• Website quality
• Technical health
• Content quality
• Search demand
• Industry

A credible agency should explain what can realistically change in:

• 30 days
• 90 days
• 6 months

rather than simply saying:

"Rankings will improve in three months."

What Happens If the Strategy Isn't Working?

This question tests accountability. A good agency should have a process for changing direction.

For example:

Measure → Diagnose → Hypothesize → Test → Learn → Adjust

If a strategy isn't producing results, the agency should be able to explain:

• What isn't working
• Why they believe it isn't working
• What they will change
• What they expect the change to achieve

SEO should be an ongoing learning process.

How Do You Connect SEO to Revenue?

This is perhaps the most important question.

Traffic is useful.

Rankings are useful.

But businesses ultimately need customers.

Ask the agency:

"How will you connect organic search performance to commercial outcomes?"

That could include:

• Lead generation
• Qualified opportunities
• Demo requests
• Sales pipeline
• Ecommerce revenue
• Customer acquisition cost
• Assisted conversions

If the agency cannot explain the connection between SEO and business growth, you may be buying activity rather than outcomes.

Red Flags When Choosing an SEO Agency

Beyond the questions above, watch for warning signs.

Guaranteed #1 rankings

Search engines don't work like a fixed advertising placement.

Huge backlink promises

Quantity is not the same as authority.

No access to reporting

You should have visibility into performance.

Generic strategy

Your strategy should reflect your market.

Keyword obsession

SEO is more than keyword rankings.

No technical SEO

Content cannot compensate for fundamental technical problems indefinitely.

No commercial thinking

If the agency only discusses traffic, ask how traffic becomes revenue.

What a Good SEO Agency Should Look Like in 2026

Modern SEO should connect several disciplines.

Technical SEO

Make the website accessible and understandable.

Content

Build useful topic coverage.

Authority

Earn credible external signals.

Conversion

Turn visibility into action.

AEO

Answer buyer questions directly.

GEO

Build enough relevance, authority and entity clarity for AI systems to understand and potentially mention the brand.

Measurement

Connect activity to commercial outcomes. This is closer to a search visibility system than a traditional ranking campaign.

SEO Agency vs AI-First Digital Marketing Agency

There is also an important distinction between a traditional SEO agency and an AI-first marketing partner.

A traditional SEO agency may focus heavily on:

• Keywords
• Rankings
• Content
• Links
• Technical SEO

An AI-first growth agency may connect those activities with:

• GEO
• AEO
• AI-assisted research
• Automation
• Paid media
• CRM
• Attribution
• Revenue intelligence

Zero Theory positions itself as an AI-first digital marketing agency built around this connected approach.

That doesn't mean every company needs every service. It means the agency should understand how the channels influence each other.

The Best Question to Ask at the End

After asking all 15 questions, ask one final question:

"Based on everything you've seen about our business, what would you NOT do?"

This is surprisingly revealing.

An agency that says:

"We'd do everything"

probably hasn't been prioritized.

A stronger agency might say:

"We wouldn't invest heavily in paid social yet because your current conversion path isn't ready."

Or:

"We wouldn't publish 50 new blogs because your existing commercial pages need restructuring first."

That is strategic thinking.

How to Compare Two SEO Agencies

Don't compare proposals by:

Number of blogs + number of backlinks + monthly price

Instead compare:

Diagnosis → Strategy → Expertise → Execution → Measurement → Accountability

Ask each agency to explain:

1. What is the biggest SEO opportunity?
2. What is the biggest problem?
3. What will they do first?
4. What will they deliberately not do?
5. How will they measure success?
6. How does the work connect to revenue?
7. How will they adapt if results differ from expectations?

The better proposal usually becomes obvious.

Conclusion

The right questions to ask an SEO agency are not about whether they know the latest SEO terminology. They are about whether they understand your business.

A strong SEO partner should be able to explain:

• Where your visibility is weak
• Why it is weak
• Which opportunities matter commercially
• What they will change
• How they will measure progress
• How SEO connects to revenue
• How search is evolving
• How they will adapt

In 2026, choosing an SEO agency should mean evaluating more than rankings. You are choosing a partner for how your brand gets discovered, understood and considered across traditional search and increasingly AI-mediated search. That is a much bigger decision than buying an SEO package.