We built 5 marketplaces in 2025. Here is what each actually cost, what took the longest, and where founders overspend.
By David Friedman, Founder of AppBrewers
Marketplaces are the most complex web apps you can build. Two-sided platforms need user management, payments, reviews, search, and admin dashboards. We built 5 marketplaces in 2025. Here is what each actually cost.
What Makes Marketplaces Expensive
| Feature | Complexity | Why It Costs More |
|---|---|---|
| Multi-vendor accounts | High | Each vendor needs their own dashboard, payouts, and tax handling. |
| Escrow payments | High | Holding funds until delivery requires legal compliance and banking integration. |
| Search and filtering | Medium | Elasticsearch or Algolia adds infrastructure cost and dev time. |
| Reviews and ratings | Medium | Fake review detection, moderation, and dispute handling. |
| Real-time messaging | Medium | Chat between buyers and sellers with notifications. |
| Commission logic | High | Variable fees, subscriptions, and promoted listings. |
| Admin moderation | Medium | Content flagging, user bans, and dispute resolution. |
Cost by Marketplace Type
| Type | Timeline | Cost Range | Example |
|---|---|---|---|
| Service marketplace | 6-10 weeks | 12,000-25,000 Euro | Tutors, cleaners, consultants |
| Product marketplace | 8-14 weeks | 18,000-35,000 Euro | Handmade goods, electronics |
| Rental marketplace | 8-12 weeks | 15,000-30,000 Euro | Cars, equipment, property |
| Digital marketplace | 6-10 weeks | 10,000-20,000 Euro | Templates, courses, plugins |
| B2B marketplace | 10-20 weeks | 25,000-50,000 Euro | Wholesale, procurement |
Cost Breakdown: Service Marketplace
| Component | Hours | Cost |
|---|---|---|
| UX/UI design | 40-60 | 2,000-3,500 Euro |
| Buyer flow (search, book, pay) | 60-80 | 4,000-6,000 Euro |
| Seller dashboard | 40-60 | 3,000-4,500 Euro |
| Payments (Stripe Connect) | 30-50 | 2,500-4,000 Euro |
| Reviews and ratings | 20-30 | 1,500-2,500 Euro |
| Admin panel | 30-40 | 2,500-3,500 Euro |
| Notifications (push, email) | 20-30 | 1,500-2,500 Euro |
| Testing and QA | 30-40 | 2,000-3,000 Euro |
| Total | 270-390 | 19,000-29,500 Euro |
Where Founders Overspend
Building Custom Everything
Using Stripe Connect instead of building a custom payment system saves 4-6 weeks and 8,000-12,000 Euro.
Over-Engineering Search
A simple database query with indexes handles 10,000 listings. Elasticsearch is only needed at 100,000+.
Adding AI Matching on Day One
Manual curation works for the first 500 users. AI matching is a v2 feature, not v1.
Ignoring Mobile
60% of marketplace traffic is mobile. A responsive web app is enough for MVP. Native apps come later.
The AppBrewers Marketplace Stack
| Layer | Technology | Why |
|---|---|---|
| Frontend | Next.js 15 | App Router, SEO, fast loads |
| Backend | Firebase / Node.js | Real-time, scalable |
| Payments | Stripe Connect | Multi-vendor payouts |
| Search | Algolia (if needed) | Fast, typo-tolerant |
| Storage | Firebase Storage | Images, documents |
| Notifications | Firebase Cloud Messaging | Push, in-app |
| Hosting | Vercel / Firebase | Edge, cheap, fast |
Need a Marketplace Built?
We have built 5 marketplaces. Fixed pricing. 8-14 weeks.
Originally published on the AppBrewers Blog.
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