Answers to "how much does it cost to build an online store" range from zero to half a million reais, and most search results never explain why. The difference almost always comes down to business size, the level of customization, and the recurring fees that rarely come up in the first conversation with a vendor.
How much it costs to build an online store (overview by size)
All figures below are in R$, the Brazilian real, which is Brazil's currency.
| Operation size | Initial investment | Recommended platform |
|---|---|---|
| Small store, lean catalog | R$ 0 to R$ 5,000 | Entry-level SaaS, ready-made theme |
| Growing store, medium volume | R$ 8,000 to R$ 25,000 | Robust SaaS with a custom theme |
| B2B operation or large catalog | R$ 25,000 to R$ 100,000+ | Open source, headless, or custom-built |
Platform cost vs. implementation cost
The platform's price (the SaaS monthly fee, or infrastructure in the case of open source) is only part of the bill. Implementation (a custom theme, catalog setup, payment and shipping integrations, checkout testing) usually weighs more than the monthly fee in the first few months. To understand the structural differences between platform models, see the guide to ecommerce platforms.
Hidden fees: payment gateway, fraud screening, integrations
The initial proposal rarely details the recurring costs that continue after launch, and these are exactly what tends to surprise everyone by the end of the first quarter of operation.
| Fee | Reference range | When it applies |
|---|---|---|
| Payment gateway | 2.9% + a small fixed fee per transaction (market reference) | every approved sale |
| Fraud screening | a small fee per order screened | every purchase attempt |
| Essential apps | R$ 50 to R$ 500/month per app | shipping, reviews, automation, invoicing |
| Sales commission | 0% to 2% depending on the plan | some SaaS platforms |
Adding these fees up against projected sales volume, not current volume, is what prevents the surprise of discovering, six months later, that cost per order grew faster than revenue.
Ready-made platform store vs. custom: the investment difference
A ready-made platform store solves things fast: a simple catalog, an adapted theme, the platform's standard checkout. A custom store costs more upfront because it solves business rules a ready-made theme does not cover: per-customer pricing, a restricted catalog, deep ERP or CRM integrations. The right question is not "which one is cheaper," it is "which one supports the operation without becoming a bottleneck over the next 24 months."
The monthly cost of keeping the operation running
Items that make up the recurring monthly cost
- The platform's monthly fee on the plan that matches the real order volume.
- Gateway and fraud-screening fees on the volume transacted.
- Shipping, reviews, automation, and invoicing integration apps.
- Technical maintenance, theme updates, and fixes.
- Content and product photography, as the catalog grows.
A complete cost picture should also account for the store's expected conversion rate: the right investment is the one that pays for itself through the sales volume the chosen structure can sustain.
Conclusion
There is no single number for "how much does it cost to build an online store": there is a range that depends on the operation's size, the level of customization needed, and the recurring fees that come with every sale. Defining this before requesting quotes prevents comparing proposals that, in practice, are not the same project.
KCLOCK builds online stores with optimized checkout, integrations, and a catalog designed for your business's real size. Request a free diagnostic.
Frequently asked questions about how much does it cost to build an online store
How much does a professional online store cost to build?
From R$ 0 to R$ 5,000 for a small store on an entry-level SaaS platform, up to R$ 100,000 or more for B2B operations or large catalogs that require a custom-built platform.
What recurring fees does an online store have beyond the monthly plan?
Payment gateway fees (a common market reference is around 2.9% plus a small fixed fee per transaction), fraud screening, shipping and automation apps, and, on some SaaS plans, a sales commission.
Is a ready-made platform store or a custom one worth more?
It depends on how complex the business rules are. A simple catalog and a lean team work well with a ready-made platform; per-customer pricing rules, deep integrations, or a large catalog usually require customization.
How do I avoid surprises in the online store's monthly cost?
By adding up the monthly fee, projected gateway and fraud-screening fees at expected volume (not current volume), essential apps, and technical maintenance before deciding on a platform.
About the author
Yara Iencius
Partner and Head of Design & UX, KCLOCK
Conversion designer. Responsible for UX/UI, interfaces, landing pages, and e-commerce sites that turn strategy into a high-converting experience.
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