Short answer: Choose a digital marketing agency by checking whether it can connect channel work to revenue, show relevant evidence, explain account ownership and report qualified leads—not just impressions. The right partner should diagnose your funnel before recommending channels and should make costs, responsibilities and exit terms clear.
Start with the business problem, not the service list
Before comparing proposals, define the result you need: qualified sales conversations, appointments, site visits, ecommerce revenue or organic visibility. “We need SEO and social media” is not a measurable objective; “we need 40 qualified enquiries a month at a viable acquisition cost” is.
A credible agency will ask about margins, sales capacity, geography, buying cycle and current conversion rate. If it recommends every channel before understanding those constraints, the proposal is probably a menu rather than a strategy.
The 15 questions to ask before hiring
Ask these questions in the first two conversations. The quality and specificity of the answers are more useful than a polished pitch deck.
- Which business metric will you optimise first?
- Who will own our website, analytics and advertising accounts?
- What work happens in the first 30 days?
- Which channel should we not use yet, and why?
- How do you define a qualified lead?
- How will you connect leads to sales outcomes?
- Can you show a relevant case study and explain the baseline?
- Who will work on our account each week?
- What information or approvals do you need from us?
- How often will we receive reports and what will they contain?
- How do you handle tracking failures or bad lead quality?
- Which fees exclude media, tools or production?
- What is the minimum learning period?
- What happens when performance is below plan?
- What are the contract, notice and handover terms?
Compare evidence, not headline claims
A case study is useful when it states the starting position, period, spend or scope, exact intervention and measured result. A screenshot with no context cannot show whether an agency created the improvement.
Ask how much of the result came from the offer, media, website and sales follow-up. Marketing performance is a connected system; unusually low cost per lead can still be poor performance when leads never qualify or receive a slow response.
Decision framework
| Dimension | Strong answer | Warning sign |
|---|---|---|
| Strategy | One prioritised plan tied to revenue | Every service recommended immediately |
| Measurement | Qualified leads, pipeline and revenue | Reach, clicks and followers only |
| Ownership | Client-owned accounts and data | Agency-controlled assets |
| Evidence | Relevant baseline and time period | Unverifiable headline number |
| Communication | Named team and decision cadence | Unclear responsibility |
Understand pricing and ownership
Separate the agency fee from advertising spend, software, creative production and website work. Compare proposals by deliverables, senior attention and measurement—not by the number of posts or keywords.
Your business should normally retain administrative ownership of its domain, website, analytics, Search Console and ad accounts. The agency can be granted access. This makes data portable and prevents an avoidable lock-in.
A simple selection scorecard
Score each shortlisted partner from one to five across strategy, relevant experience, measurement, transparency, team quality and commercial fit. Weight strategy and measurement more heavily than presentation quality.
What to do next
Use this framework as a starting point, then replace assumptions with your own search, campaign, CRM and revenue data. Explore Digital Marketing and GrowthSparx case studies for the implementation side.