Hiring an SEO agency is one of the most consequential decisions a marketing team can make. Done right, it compounds returns over time. Done wrong, you waste budget, potentially damage your site, and lose months you can’t get back.
This guide covers the entire evaluation process — from knowing what to look for to spotting red flags in proposals and contracts.
What you’ll learn
- How to define what you actually need from an SEO agency
- The right questions to ask before signing anything
- Red flags that indicate low-quality or risky agencies
- How to evaluate a proposal and compare agencies
- What a good engagement looks like in the first 90 days
1. Define what you actually need
Before reaching out to any agency, you need to be clear on what problem you’re solving. “We need better SEO” is not specific enough. The type of SEO work required varies dramatically depending on your situation.
Technical SEO
If your site has crawlability issues, slow Core Web Vitals, duplicate content, or indexing problems — you need an agency strong in technical SEO. This is usually a one-off or quarterly engagement, not an ongoing retainer.
Content & on-page SEO
If you’re trying to rank for informational or transactional keywords by publishing content — you need an agency that specialises in content strategy and on-page optimisation. This is typically an ongoing engagement with monthly deliverables.
Link building
If your site has solid technical foundations and good content, but lacks domain authority in competitive verticals — you need a link building agency. Quality matters enormously here; bad links can do more harm than none at all.
Tip: Many agencies offer all three, but usually have one genuine strength. Ask them directly: “What percentage of your clients are primarily here for technical work vs. content vs. links?” The answer tells you a lot.
2. Questions to ask before you hire
Most agencies will send you a polished deck. Your job is to get past it. Here are the questions that actually reveal quality:
Can you show me a site you’ve grown organically in the past 12 months? Concrete, verifiable results in a comparable vertical.
Who will actually be working on my account? Many agencies sell on the strength of senior staff but deliver through juniors.
How do you handle algorithm updates? Listen for awareness of recent updates, not generic reassurances.
What does the first 90 days look like? Good agencies have a clear onboarding and audit process.
What KPIs will you report on, and how often? Avoid agencies that lead with rankings — organic traffic and revenue attribution matter more.
Do you outsource any of the work? Content, links, or technical work farmed out to subcontractors without disclosure is a red flag.
3. Red flags to watch for
The SEO industry has a higher-than-average share of low-quality or outright harmful operators. These signals should raise immediate concern:
🚩 Guaranteed rankings
No one can guarantee Google rankings. Anyone who does is either lying or planning to use risky tactics.
🚩 Very low prices
Quality SEO is labour-intensive. If the price seems impossible, corners are being cut somewhere.
🚩 No transparency on link building
Paid links, private blog networks, or link farms can get your site penalised.
🚩 Vague reporting
If they can’t tell you exactly what they’ll deliver and measure, they’re not accountable.
🚩 Lock-in contracts
12-month minimum commitments with no performance clause are a sign of low confidence in results.
🚩 No case studies
Any credible agency has at least a few clients willing to be referenced.
Watch out: Agencies that promise “top 3 positions in 30 days” or “10x traffic in 3 months” are almost always using black-hat tactics. Short-term gains from these approaches are typically followed by manual penalties or algorithmic drops.
4. Evaluating a proposal
A good proposal should tell you why they’re recommending each activity, not just what they’ll do. Look for:
A site audit summary — they should have looked at your site before writing the proposal
Competitor gap analysis — where are you vs. your main organic competitors?
Prioritised recommendations — not a laundry list, but a reasoned order of what to tackle first
Realistic timelines — SEO takes time; proposals promising results in weeks should be treated sceptically
Clear deliverables and ownership — what they deliver, what you’re responsible for
Good sign: The agency asks about your sales cycle, average deal value, and revenue attribution setup. It means they’re thinking about actual business impact, not just traffic numbers.
5. What good looks like in the first 90 days
Even with a great agency, SEO results take time. But the process should be immediately clear. In the first three months, you should expect:
Month 1: Full technical audit, keyword research, competitor analysis, content gap report, and a prioritised roadmap with your input
Month 2: Implementation of technical fixes in coordination with your dev team, content briefs or drafts, initial link prospecting
Month 3: First content live, link outreach underway, regular reporting cadence established, first data-driven adjustments
If you’re two months in and still waiting for a strategy document — that’s a problem. The agency should be producing tangible work, even if rankings haven’t moved yet.
Bottom line
Choosing the right SEO agency comes down to clarity on your needs, diligence in your evaluation, and healthy scepticism towards big promises. The best agencies don’t oversell — they walk you through a realistic process, show you real results from comparable clients, and communicate clearly from the start.
Use our agency directory to find and compare vetted SEO agencies by location, team size, and specialisation — or fill in our brief and we’ll match you manually within 24 hours.