Choosing a Shopify Plus agency is a $50K–$300K decision that will shape your store’s performance, revenue, and team sanity for the next 2-3 years. Pick the right one and you’ll launch on time, migrate cleanly, and have a partner who proactively grows your store. Pick the wrong one and you’ll deal with missed deadlines, lost organic traffic, and a codebase nobody wants to touch.
We’ve been on both sides — building stores for clients and helping brands recover from bad agency relationships. Here’s the evaluation framework we’d use if we were the ones hiring.
The 8-Point Evaluation Framework
1. Platform Migration Experience
This is the single most important criterion. A Shopify Plus migration gone wrong can cost you months of lost revenue and 6-12 months of SEO recovery.
What to ask:
- “How many migrations have you completed from [your current platform] to Shopify Plus?”
- “Can you show me case studies with before-and-after metrics?”
- “What’s your process for SEO redirect mapping and data integrity?”
- “What percentage of your migrations launch on time and on budget?”
Red flag: An agency that can’t give you a specific number of migrations, or one that says “we’ve done a few” without being able to share results. Our Shopify Plus migration work includes documented results — like the Nova Gear project where we achieved 3x B2B order volume growth post-migration.
2. Technical Depth
Shopify Plus is a powerful platform, but its advantages require skilled implementation. You need an agency that understands more than just theme customization.
Essential technical capabilities:
- Checkout extensibility — custom checkout UI and functionality using Shopify’s modern checkout APIs
- Shopify Functions — server-side customizations for cart rules, shipping, discounts, and payment
- B2B commerce — wholesale pricing, quantity breaks, company accounts, purchase orders
- Headless (Hydrogen/Oxygen) — for brands that need custom storefronts with sub-second performance
- Performance engineering — Core Web Vitals optimization, page speed tuning
- API integrations — ERP, PIM, OMS, and 3PL connections
What to ask:
- “Can you show me a store you’ve built with checkout extensibility?”
- “Have you implemented Shopify Functions for custom pricing logic?”
- “What’s your approach to Core Web Vitals optimization?”
Red flag: An agency that talks only about themes and apps without mentioning checkout extensibility, Shopify Functions, or Hydrogen. In 2026, those are table stakes for enterprise work.
3. Post-Launch Support Model
The agency relationship doesn’t end at launch — it evolves. Stores need ongoing optimization, app updates, performance monitoring, and feature development.
Questions to ask:
- “What does your post-launch support include?”
- “Do you offer retainers, or only project-based work?”
- “How quickly can you respond to urgent issues?”
- “Who owns the code and assets after launch?”
The best agencies offer structured retainers that include performance monitoring, A/B testing, and iterative improvements. Our ongoing development services are designed for exactly this — continuous improvement, not just a one-time build.
Red flag: An agency that’s eager to sell you a build but vague about what happens after launch day.
4. Industry Experience
E-commerce has vertical-specific requirements. A fashion brand needs different functionality than a B2B industrial supplier.
What to look for:
- Case studies in your industry or a closely related one
- Understanding of your compliance requirements (e.g., FDA for supplements, HIPAA for health)
- Familiarity with your key integrations (ERP, POS, 3PL, accounting)
- Knowledge of your customer’s buying behavior and expectations
For example, our work with Aura Botanics in beauty and cosmetics gave us deep expertise in subscription models, personalized recommendations, and mobile-first shopping — insights that transfer directly to other DTC brands.
5. Pricing Transparency
Shopify Plus agency pricing varies widely — from $30K for a basic theme build to $300K+ for a complex enterprise implementation with custom integrations and headless architecture.
Pricing models you’ll encounter:
| Model | Range | Best For |
|---|---|---|
| Fixed-price project | $30K–$150K | Well-defined scope, standard theme customization |
| Time & materials | $150–$250/hr | Complex projects with evolving requirements |
| Retainer | $5K–$25K/month | Ongoing optimization and development |
What to ask:
- “Can you provide a detailed proposal with line items?”
- “What’s included in the base price and what’s an add-on?”
- “How do you handle scope changes?”
- “What happens if we go over budget?”
Red flag: An agency that gives you a single number without a breakdown. You should know exactly what you’re paying for — design, development, migration, QA, launch support, and post-launch optimization should each be line items.
6. Communication and Process
Good agencies have clear processes. Great agencies have processes that adapt to your team’s workflow.
What to look for:
- A defined project timeline with milestones and check-ins
- A single point of contact who understands both your business and the technical work
- Regular progress updates (weekly at minimum)
- A staging environment where you can review work before it goes live
- Written documentation for all custom code and configurations
Red flag: An agency that can’t tell you their process, or one that says “we’ll figure it out as we go.” That’s fine for a hobby project, not for your $1M+ revenue store.
7. Performance Track Record
Case studies with real metrics — not just screenshots of pretty stores.
Metrics that matter:
- Conversion rate improvements (before and after)
- Page speed scores (Core Web Vitals)
- Organic traffic changes post-migration
- Bounce rate reductions
- Revenue impact
Our case studies include specific numbers. The Nova Gear migration delivered 220% organic revenue growth and 40% bounce rate reduction. The Aura Botanics headless build achieved 135% conversion improvement and 0.4s load time.
8. Cultural Fit and Values
This is subjective but important. You’ll work with this team for months, and potentially years.
Consider:
- Do they understand your brand’s aesthetic and values?
- Are they proactive about suggesting improvements, or purely reactive?
- Do they challenge your assumptions when needed, or just do what you ask?
- Do they communicate in your language (both literally and figuratively)?
Questions to Ask Every Shopify Plus Agency
Bring these to your initial calls:
- “How many Shopify Plus stores have you launched in the past 12 months?”
- “Can I talk to 2-3 references from recent projects?”
- “What’s your average project timeline from kick-off to launch?”
- “How do you handle SEO preservation during migration?”
- “What happens if the project goes over scope or timeline?”
- “Do you build with checkout extensibility or checkout.liquid?” (The correct 2026 answer is checkout extensibility — checkout.liquid is deprecated)
- “What’s your approach to page speed and Core Web Vitals?”
- “Who will be my day-to-day contact, and how often will we communicate?”
- “What’s not included in your proposal that I should budget for?”
- “What makes you different from the other agencies I’m evaluating?”
Red Flags That Should Send You Running
- No case studies with real metrics — pretty pictures aren’t results
- Guaranteed #1 rankings — no legitimate agency guarantees SEO rankings
- Vague timelines — “a few months” isn’t a timeline
- No staging environment — you should always be able to review work before launch
- Ownership questions — you should own your theme, code, and data, period
- Only one developer — what happens when they’re sick or on vacation?
- No post-launch plan — launch day is the beginning, not the end
FAQ
How much does a Shopify Plus agency cost?
Project-based work ranges from $30K for a standard theme customization to $300K+ for enterprise implementations with custom integrations. Ongoing retainers run $5K–$25K/month. The right investment depends on your revenue, complexity, and growth targets. For brands doing $1M+ in annual revenue, a $50K–$150K build is typical.
How long does a Shopify Plus project take?
Standard theme builds: 6-10 weeks. Custom migrations: 8-12 weeks. Headless builds: 10-16 weeks. Enterprise implementations with ERP/PIM integrations: 12-20 weeks. Timeline depends on complexity, decision speed, and content readiness.
Should I hire a freelancer or an agency for Shopify Plus?
For brands under $500K in annual revenue, a skilled freelancer can work. For brands doing $1M+, an agency provides the breadth of skills (design, development, SEO, strategy, QA) and the bandwidth to handle complex projects. The risk with freelancers is limited capacity and single points of failure.
What’s the difference between a Shopify Partner and a Shopify Plus Partner?
Shopify Plus Partners have demonstrated expertise with the Plus platform specifically — they’ve completed multiple Plus projects, have access to Plus-specific APIs and features, and have a direct relationship with Shopify’s Plus support team. If you’re on Shopify Plus, you want a Plus Partner. Check the Shopify Plus Partner directory.
Can I switch agencies mid-project?
Yes, but it’s expensive and painful. Code quality varies, documentation is often sparse, and the new agency needs time to understand the existing codebase. The best strategy is to choose carefully upfront using this framework. But if you’re in a bad situation, switching is better than staying — we’ve helped several brands recover from failed agency relationships.
Looking for a Shopify Plus Agency?
We built this framework because it’s what we’d want if we were hiring. If you’re evaluating agencies, use it — even if you don’t choose us.
If you want to see how we measure up, let’s talk about your project →