The Shopify Plus agency market is full of agencies saying the same things.
What you need from an agency changes as your brand grows, and most agencies aren't honest about where they fit.
We've worked with brands from first Shopify Plus build through to complex multi-market operations. We've also inherited projects from agencies that were the wrong fit - not because they were bad, but because the brand outgrew them.
Here's what we think you should actually expect at each stage, what realistic budgets look like, and the stuff nobody puts in their proposal.
Your revenue changes your needs.
A brand doing $5M has different infrastructure needs, different team structures, and different operational pressure than a brand doing $50M.
$5M-$10M: Foundation stage
You've found product-market fit and you're growing. Your Shopify store works but it's held together with apps and workarounds. You might still be on standard Shopify and considering Plus, or you're on Plus but haven't really used its capabilities.
At this stage, you need a clean build with solid fundamentals - good UX, fast page loads, a checkout that doesn't leak conversions, and integrations that actually sync reliably. You probably don't need headless. You don't need a $150K+ build. What you need is an agency that builds things properly the first time so you're not paying to rebuild in 18 months.
$10M-$30M: Infrastructure stage
This is where things get real. You've got an ERP that needs to talk to Shopify. You've got a 3PL (maybe two). You've got Klaviyo, a reviews platform, a loyalty program, and a returns tool. Your checkout has custom logic. You might be selling wholesale and DTC from the same backend.
At this stage, the storefront is only part of the problem. The real challenge is making your commerce stack work as a system - not just a collection of tools that happen to be connected. You need an agency that thinks about operations, not just design.
$30M-$100M+: Scale stage
You're running multiple markets, possibly multiple storefronts. Your integration layer is complex. Your team is bigger, which means your agency needs to work within your processes, not impose theirs. You might be evaluating headless because your content and merchandising teams need independence from development cycles.
At this stage, you need a technical partner with opinions about architecture, not just an agency that builds what you brief. The gap between a store that's built to scale and one that breaks under pressure shows up here - usually during your biggest sale of the year.
An agency pitching a $150K headless build to a $5M brand is selling you what they want to build, not what you need. And an agency pitching a basic theme build to a $30M brand with complex operations doesn't understand what they're walking into.
Discovery is non-negotiable (at any size)
Any agency quoting you a build price without a discovery phase is guessing. A proper discovery includes a technical audit of your current platform, integration mapping, content and data audit, UX review, and a clear scope of work with itemised deliverables.
Discovery typically costs $5,000-$15,000 and takes 2-4 weeks. It's the single best investment you can make before a build, and we covered why in our piece on hidden migration costs. If an agency wants to skip discovery and jump straight to building, that tells you they're either not experienced enough to know what they don't know, or they're banking on scope changes to pad the project later.
What realistic budgets actually look like
Most agencies won't publish pricing because "it depends." That's partly true - scope drives cost. But vague pricing benefits the agency, not you. So here's where things actually land.
A theme-based Shopify Plus build with custom design, standard integrations, and checkout customisation typically ranges from $30,000 to $80,000. This is the right range for most brands at the $5M-$15M stage. If someone quotes you less than $25K for a "full Shopify Plus build," you're getting a theme install with a logo swap.
A more complex build - custom product architecture, multiple integration touchpoints, migration from another platform, advanced checkout logic - sits in the $60,000 to $150,000+ range. This is where most $15M-$50M brands land.
A headless build using Hydrogen with a CMS like Sanity and search via Algolia starts around $80,000 and goes up from there depending on the complexity of your content model and integration layer. Headless isn't automatically better. It's better when your content, merchandising, and design requirements genuinely exceed what a Liquid theme can deliver. We've talked brands out of headless builds when their actual requirements didn't justify the ongoing maintenance cost.
Platform migrations from Magento, WooCommerce, or BigCommerce add 20-30% to any of these ranges. Data migration, redirect mapping, SEO preservation, and integration rearchitecting take time. Trying to cut corners on migration is how you lose organic traffic and break customer accounts.
Post-launch retainers for ongoing development, optimisation, and strategic support typically run $5K-$15K per month. This should be structured as sprint-based work with defined deliverables - not open-ended hourly billing where you're paying for time without knowing what you're getting.
Your agency should care about your operations, not just your storefront
Your storefront is only one part of your commerce operation. Behind it sits your ERP, your inventory system, your 3PL, your email platform, your analytics stack, your returns tool, your loyalty program, and whatever custom workflows your team has built to keep everything running.
Most agencies focus on the storefront because that's the visible part. They'll build you a beautiful store, hand over the keys, and wish you luck with the rest. The problem shows up six months later when your inventory sync breaks during a sale, or your ERP isn't mapping discount codes correctly, or your 3PL integration silently drops orders during peak.
The question worth asking isn't just "can you build our store?" It's "who's making sure our entire commerce stack works together - not just today, but at 3 AM during our biggest sale of the year?"
This is what we mean when we talk about commerce infrastructure. The store is the interface. The infrastructure is everything that makes it work. The best agencies think about both.
Opinions, not just execution
A great agency has opinions about your business. They'll tell you when an idea won't work. They'll challenge your assumptions about what your customers need. They'll recommend against building features that won't move revenue.
This is uncomfortable. Plenty of brands choose agencies that say yes to everything. Agencies that only say yes produce mediocre work because they're building what you asked for, not what your business needs. The brands that see the best results - like the 175% increase in orders we delivered for Lo & Co - get there because the agency brought strategic thinking to the project, not just technical execution.'
What good opinions sound like in practice: "Your homepage doesn't need a redesign - your product pages need better UX that builds perceived value." Or "Don't build a custom loyalty program - use an existing tool and invest the savings in better email flows." Or "You don't need headless yet - your current architecture can support 3x your revenue with optimisation."
An agency that only tells you what you want to hear is a vendor. Not a partner.
How ongoing relationships should work
The build is the beginning. Post-launch, most brands need ongoing development, optimisation, and strategic support. Here's how that should be structured.
Retainer relationships should be sprint-based, not open-ended hourly billing. Each sprint (typically 2 weeks) should have defined deliverables, clear priorities, and measurable outcomes. You should know exactly what you're getting each month, not just how many hours were burned. The best agencies structure retainers as a roadmap with sprint durations rather than dollar amounts, giving you control over pace and priority.'
A good post-launch cadence looks like this: kickoff at the start of each sprint to align priorities, delivery at the end with a recorded walkthrough of what was built, and a short feedback window before the next sprint starts. Your account lead should be holding scope - making sure the work stays focused on what matters, not expanding into nice-to-haves that dilute impact.
Red flags
No discovery phase offered. Vague pricing with "it depends" as the only answer. Case studies that show designs but no business metrics. A team that doesn't ask about your integrations, your ERP, or your operational workflows. Proposals that focus entirely on the storefront and ignore what's behind it. Any agency that suggests rebuilding everything without evaluating whether iteration might be smarter. And pitching headless as the default without understanding your actual requirements.
What to ask in your first conversation
Skip the "tell me about your agency" warmup. Ask these instead:
- What's the most common mistake you see brands our size make on Shopify Plus?
- What would you recommend we don't build?
- How do you handle scope changes mid-project?
- What does your team structure look like for a project our size?
- How do you think about the integration layer, not just the storefront?
The answers will tell you more about the agency than any portfolio or pitch deck. You want specificity, self-awareness, and a clear point of view on commerce. Not sales language.
Finding the right fit
The right agency for a $5M brand isn't the right agency for a $50M brand.
The right agency for a DTC fashion brand isn't the same as the right agency for a B2B industrial supplier. Fit matters more than reputation.
Look for agencies that have worked with brands at your scale, in your vertical, with your complexity level.
Ask for references you can actually call. Pay attention to how they communicate during the sales process - because that's exactly how they'll communicate during the project.
If you're evaluating agencies and want a straight conversation, we're here for that.
A Shopify Plus Agency for Strategic Design & Advanced Engineering
Building something ambitious?
- What you need from a Shopify Plus agency changes significantly at $5M, $20M, and $50M+
- Realistic build budgets range from $30K-$150K+ depending on complexity - not the $200K+ numbers some agencies quote to seem premium
- Discovery before build commitment is non-negotiable at any revenue tier
- The real differentiator is whether your agency thinks about your commerce operations, not just your storefront
- Sprint-based retainers with defined deliverables beat open-ended hourly billing every time
- The best agencies will tell you what not to build
