Hiring an ecommerce agency is one of the most consequential decisions a brand makes. Get it right, and you gain a strategic partner who accelerates growth, solves technical problems, and frees your team to focus on the business. Get it wrong, and you waste months of time, tens of thousands of pounds, and end up further behind than when you started.
I have spent twenty years in ecommerce — building brands, running agencies, and watching how the relationship between brands and agencies plays out across hundreds of engagements. The pattern is remarkably consistent: the brands that get the most value from agencies are the ones that approach the hiring process with clarity, realistic expectations, and a willingness to invest in the relationship.
This guide covers everything from deciding whether you need an agency at all, through to managing the relationship for long-term value. It is written for brand founders, marketing directors, and ecommerce managers who want to make a good decision and avoid the common mistakes.
When you actually need an agency
Not every business needs an agency. Before you start looking, be honest about whether an agency is the right solution for your situation. There are several scenarios where an agency makes clear sense, and others where it does not.
An agency makes sense when you need specialist expertise that would be impractical to hire in-house. If you need a Shopify store built or migrated, that is a project with a defined scope that requires deep platform expertise. Hiring a full-time Shopify developer for a one-off build makes no sense. An agency that does this work every day will deliver better results, faster, and at lower total cost.
An agency also makes sense when you need ongoing specialist support but cannot justify a full-time hire. A growing brand might need ten to fifteen hours of SEO work per month — not enough for a full-time role, but enough to require genuine expertise. An agency retainer fills this gap efficiently.
An agency is the wrong choice when you do not have clarity on what you need. If you cannot articulate what problem you are trying to solve, an agency will either sell you what they are good at (regardless of whether it is what you need) or spend your budget on discovery work that should have been done internally first.
It is also the wrong choice when you expect to abdicate responsibility. An agency is a partner, not a replacement for internal leadership. The brands that get the worst results from agencies are those that hand over the keys and say "sort it out." You need someone internally who owns the relationship, understands the strategy, and can make decisions when needed.
Defining your scope before you start looking
The single biggest predictor of a successful agency engagement is the quality of the brief. And the quality of the brief depends on the clarity of your thinking before you write it.
Before you speak to a single agency, answer these questions:
- What business problem are you trying to solve? Not "we need a new website" but "our conversion rate is 40% below category average and our current platform cannot support the product catalogue changes we need to make."
- What does success look like? Define measurable outcomes. "Increase organic traffic by 50% over 12 months" is useful. "Improve our online presence" is not.
- What is your realistic budget? Agencies need to know your budget to propose appropriate solutions. Hiding your budget does not get you a better price — it gets you proposals that are either wildly over or under what you can afford.
- What is your timeline? When do you need this done, and what is driving that deadline? Is it a genuine business constraint or an arbitrary target?
- What internal resources do you have? Who will manage the relationship? Who makes decisions? What existing content, data, and assets can you provide?
As we covered in our guide to writing an effective agency brief, the more clearly you can articulate these points, the better the proposals you will receive and the less time you will waste in the process.
Understanding the different types of agencies
The agency landscape is fragmented, and understanding the different models helps you find the right fit.
Platform specialists
These agencies focus on a specific platform — typically Shopify, Magento, or WooCommerce. They know their platform inside out and can deliver technically excellent builds. The trade-off is that they may default to solving every problem with their platform's tools, even when a different approach would be better. For brands committed to a specific platform, this deep expertise is invaluable.
Full-service agencies
Full-service agencies offer design, development, SEO, paid media, email marketing, and sometimes content creation under one roof. The advantage is a single point of contact and (theoretically) integrated strategy. The risk is that no single agency can be excellent at everything. Often, one or two services are genuinely strong and the rest are adequate at best. Ask where their real expertise lies.
Specialist agencies
Specialist agencies focus on a single discipline — SEO, email marketing, conversion rate optimisation, or paid media. They tend to deliver the deepest expertise in their area. The trade-off is that you may need multiple agencies, which requires more management overhead and coordination.
Freelancers and micro-agencies
Small teams of one to five people can offer exceptional value, particularly for specific projects. You often get senior-level people doing the work rather than junior staff supervised by seniors. The trade-off is capacity constraints and sometimes a narrower range of skills. For focused projects with clear scope, freelancers and micro-agencies are often the best option.
Where to find agencies worth talking to
The best agency relationships rarely start with a Google search for "ecommerce agency UK." Here is where to look for agencies that are actually worth your time.
Referrals from peers. Ask other ecommerce founders and managers who they use. Peer recommendations carry weight because they come from people who have experienced the agency's work first-hand. LinkedIn connections, industry events, and founder communities are all good sources.
Platform partner directories. Shopify's Partner Directory, for example, lists agencies by specialism, location, and client reviews. While not all listed agencies are excellent, it provides a starting point filtered by verified platform expertise.
Their own content. Agencies that publish thoughtful, detailed content about their craft tend to be agencies that care about their craft. If an agency's blog is full of generic advice they clearly did not write themselves, that tells you something about how they approach their work.
Case studies and portfolios. Look at the actual work. Visit the sites they have built. Test the mobile experience. Check page speed scores. Look at their clients' search visibility using free tools like Ahrefs or SEMrush. The gap between what agencies claim and what they deliver is often wide.
As we discussed in our guide to evaluating agencies with a scorecard, having a structured framework for assessment produces much better outcomes than relying on gut feeling.
Evaluation criteria that actually matter
Once you have a shortlist of three to five agencies, you need a consistent framework for evaluation. The criteria that actually predict success are not always the ones brands focus on.
Relevant experience, not just any experience. Ten years in business means nothing if those ten years were spent building brochure websites and you need an ecommerce migration. Look for experience with businesses at your scale, in your sector, and with your specific challenges.
Process and methodology. A good agency has a clear, repeatable process for how they approach projects. Ask them to walk you through how a typical engagement works from kickoff to delivery. If the answer is vague, that is a warning sign. Our list of questions to ask before hiring covers the specific areas to probe.
The team, not just the pitch. Find out who will actually work on your account. The senior partner who presents in the pitch meeting is often not the person doing the day-to-day work. Ask to meet the team members who will be assigned to your project. Assess their experience and communication skills directly.
Communication style. Pay attention to how the agency communicates during the sales process. Are they responsive? Do they ask good questions? Do they push back when appropriate, or just agree with everything you say? The communication patterns you see during the pitch are a preview of what you will experience as a client.
Client retention and references. Ask how long their average client relationship lasts. Ask for references from current clients, not just case studies. Speak to those references and ask specific questions: what is the agency like to work with day-to-day? How do they handle problems? Would you hire them again?
Writing a brief that gets useful responses
A good brief is the foundation of a good hiring process. It should be detailed enough to allow agencies to respond meaningfully, but not so prescriptive that it eliminates creative solutions you had not considered.
Your brief should include:
- Company background. Who you are, what you sell, your target market, your current revenue range, and your growth trajectory.
- Current situation. What platform you are on, what is working, what is not, and what has prompted you to seek agency support.
- Objectives. What you want to achieve, expressed as measurable outcomes with timeframes.
- Scope. What services you need, as specifically as possible. If you are not sure, say so — a good agency will help you define scope.
- Budget range. Even a broad range helps agencies propose appropriate solutions.
- Timeline. When you need work to start, key milestones, and any hard deadlines.
- Decision criteria. How you will evaluate proposals and what matters most to you.
- Process. Your timeline for the selection process, who is involved in the decision, and next steps.
Send the brief to your shortlist and give agencies at least two weeks to respond. Good proposals take time to prepare, and rushing the process penalises the agencies that would actually do the best work.
The RFP process guide we published covers this in more detail, including common mistakes that lead to poor outcomes.
How to read and compare proposals
When proposals arrive, resist the temptation to jump straight to the price page. Price comparison without context is meaningless. A £30,000 proposal that includes comprehensive discovery, a custom design system, and three months of post-launch support is not comparable to a £20,000 proposal that delivers a templated build with no ongoing support.
Evaluate proposals against these dimensions:
Understanding of your brief. Has the agency actually engaged with your specific situation, or have they sent a generic proposal with your company name inserted? The best proposals reference specific points from your brief and demonstrate genuine understanding of your challenges.
Strategic thinking. Does the proposal simply list deliverables, or does it articulate a strategy for achieving your objectives? An agency that challenges your assumptions and proposes a different approach from what you expected is often the one that will deliver the best results.
Scope clarity. Is every deliverable clearly defined? Are assumptions documented? Are exclusions stated? Vague scope is the single biggest source of conflict in agency relationships. If the proposal is not specific about what is included, you will discover what is excluded only when you receive a change request invoice.
Realistic timelines. If one proposal promises delivery in six weeks and the others say twelve, either the first agency is significantly more efficient or they are significantly less thorough. In most cases, it is the latter.
Pricing structure. Understand how the agency prices: fixed project fee, time and materials, retainer, or hybrid. Each model has trade-offs. Fixed fees give you cost certainty but may incentivise the agency to minimise scope. Time and materials gives flexibility but less cost predictability. Retainers work well for ongoing relationships but require trust that hours are being used effectively.
Red flags that should stop you signing
After twenty years in this industry, I can identify the warning signs quickly. These are the red flags that should give you serious pause:
- Guaranteed results. No honest agency guarantees specific rankings, traffic numbers, or revenue outcomes. There are too many variables outside the agency's control. An agency that guarantees results is either lying or defining "results" in a way that is meaningless.
- Long lock-in contracts. If an agency needs a 12-month lock-in to retain clients, that tells you everything about their confidence in their own work. Good agencies retain clients because they deliver value, not because the contract prevents leaving.
- Opacity about who does the work. If the agency will not tell you who will work on your account, or if the proposal describes capabilities that require more expertise than their team possesses, they may be planning to subcontract your work without telling you.
- No discovery phase. Any agency that quotes a complex project without a discovery phase is either guessing or planning to address unknowns through change requests later. Proper development projects require discovery.
- Aggressive sales tactics. "This price is only available this week" or "We only have one slot left" are sales tactics, not genuine constraints. Good agencies do not need to pressure you into signing.
- Poor communication during the sales process. If the agency is slow, disorganised, or unclear during the pitch — when they are trying to win your business — imagine what they will be like once you have signed.
Contracts, terms, and protecting yourself
The contract is where the relationship is formalised, and it is where many brands fail to protect themselves. Every agency contract should address these points clearly:
Intellectual property. Who owns the work? In most cases, you should own all work product upon payment. This includes designs, code, content, and any custom development. If the agency retains IP rights, you are vulnerable if the relationship ends. We wrote about this in detail in our piece on website ownership.
Scope and change management. How are changes to scope handled? What constitutes a change request? What is the approval process for additional work and costs? Without clear change management procedures, costs escalate unpredictably.
Payment terms. Milestone-based payments aligned to deliverables are the fairest structure for both parties. Avoid paying large sums upfront before any work is delivered. A typical structure might be 30% on kickoff, 40% at key milestones, and 30% on completion.
Termination clauses. Both parties should have the right to terminate with reasonable notice. Thirty days is standard. Ensure the contract specifies what happens to work in progress and how final deliverables are handled if the relationship ends early.
Service level agreements. For retainer arrangements, define response times, reporting cadence, meeting schedules, and escalation procedures. Without SLAs, "ongoing support" can mean very different things to each party.
Data and access. Ensure you retain ownership of and access to all accounts, data, and platforms. Your Google Analytics, search console, advertising accounts, and email marketing platform should be in your name with the agency given appropriate access levels.
Onboarding for a productive relationship
The first thirty days of an agency relationship set the tone for everything that follows. Invest time in onboarding properly.
Knowledge transfer. Share everything the agency needs to understand your business: brand guidelines, customer personas, competitive landscape, historical performance data, and any previous agency work. The more context they have, the faster they can deliver value.
Access and credentials. Provide all necessary access on day one. Delays in granting access to platforms, analytics, and tools waste time and frustrate everyone. Prepare a comprehensive access document before the engagement starts.
Communication protocols. Agree on how you will communicate: which channels for which purposes, expected response times, meeting cadence, and who the primary contacts are on each side. Document this and share it with both teams.
Reporting and measurement. Agree on what will be measured, how it will be reported, and how often. Establish baseline metrics before work begins so you can accurately measure the agency's impact. As we explored in our article on ecommerce monthly reports, clear reporting frameworks prevent misunderstandings about performance.
Decision-making authority. Clarify who on your team can approve decisions, sign off on work, and authorise changes. Bottlenecked approvals are one of the most common causes of project delays, and they are entirely within the client's control.
Managing the ongoing relationship
The hiring process gets all the attention, but the ongoing management of the relationship is what determines whether it delivers value. Here are the practices that distinguish productive agency relationships from frustrating ones.
Regular strategic reviews. Beyond weekly operational meetings, schedule monthly or quarterly strategic reviews where you step back from the tactical work and assess whether the overall direction is right. Are you still working toward the objectives defined at the start? Have circumstances changed? Do priorities need to shift?
Honest feedback. If something is not working, say so early. Letting frustration build without communication is the fastest way to destroy an agency relationship. Equally, acknowledge when the agency does good work. People perform better when good work is recognised.
Respect their expertise. You hired the agency for their expertise. If you override every recommendation, you are paying for advice you are not taking. This does not mean accepting everything uncritically, but it does mean engaging with their recommendations seriously rather than defaulting to "do it the way we have always done it."
Provide timely feedback and approvals. Agency projects stall more often because of client delays than agency delays. Review work promptly, consolidate feedback clearly, and make decisions within agreed timeframes. Every day you delay approval is a day the project timeline extends.
Share context. Keep the agency informed about changes in your business: new product launches, seasonal priorities, budget changes, competitive developments. The more they understand about your business context, the better their work will be. If you are building an in-house team alongside agency support, communicate how roles and responsibilities are evolving.
Knowing when to move on
Not every agency relationship should be permanent. Knowing when to end a relationship is just as important as knowing how to start one.
Legitimate reasons to change agencies include: consistent failure to meet agreed deliverables, a fundamental mismatch in working style that persists despite honest communication, the agency losing key team members and failing to replace them with equivalent talent, or your business evolving beyond the agency's capabilities.
Before ending a relationship, have an honest conversation with the agency leadership. Good agencies want to know if something is not working and will make genuine efforts to fix it. If the problems persist after a clear conversation and a reasonable remediation period, it is time to plan a transition.
Plan transitions carefully. Ensure all IP, data, and access is transferred cleanly. Document the current state of all work in progress. Allow overlap between the outgoing and incoming agency where possible. A messy transition can set you back months.
Hiring an ecommerce agency well is a skill, and like most skills, it improves with practice and deliberate effort. The brands that build the best agency relationships are those that invest in the process: defining clear scope, evaluating rigorously, negotiating fair contracts, onboarding thoroughly, and managing the relationship with the same care they apply to their own team.
The agency landscape is full of capable, dedicated professionals who genuinely want to help your business succeed. Finding them requires looking past the sales pitch and evaluating the substance: their work, their process, their people, and their values. When you find the right match, the impact on your business can be transformative.
If you are in the process of evaluating agencies and want a straight conversation about what we do and whether we are the right fit, get in touch. We would rather help you find the right agency — even if it is not us — than take on work that is not a good match.