How Much Does an Ecommerce Website Cost to Build and Run?
Ecommerce website costs explained: build price, platform plans, payment processing fees, apps, shipping and tax setup, with a worked monthly fee example.
An online store costs more than a brochure site because it has to take payments, calculate shipping and tax, manage inventory and send order emails, and every one of those adds setup work and ongoing fees. For a small store using a hosted platform, the build can be modest while monthly costs are the main expense. For a large catalog or custom checkout, the build itself becomes the major cost. This guide breaks down both sides so you can budget realistically.
The two cost buckets: build and run
| Bucket | What it covers | How it is charged |
|---|---|---|
| Build | Store setup, theme design, product loading, shipping and tax settings, integrations, testing | One-time project fee, or hourly |
| Run | Platform plan, payment processing, apps and plugins, hosting, maintenance, marketing | Monthly, yearly or per order |
Many first-time sellers budget only for the build. The run costs repeat every month, so over two or three years they can exceed the build price.
What drives the build cost
Number of products and variants. Twenty products with a few sizes is a small job. Two thousand products with colors, sizes and bundles needs imports, careful data cleanup and testing. If you have a spreadsheet of clean product data, tell the developer. Poor data is a hidden cost.
Design level. A store theme with your logo and photography is inexpensive compared with a fully custom storefront. Product photography is a cost many owners overlook, and good images often matter more to sales than design flourishes.
Shipping rules. Flat-rate shipping is simple. Weight-based rates, carrier-calculated rates, local pickup, international shipping and free-shipping thresholds each add configuration time.
Sales tax. In the United States, sales tax obligations depend on the state and on where your customers are. After the Supreme Court's 2018 decision in South Dakota v. Wayfair, states can require remote sellers to collect tax once they pass certain thresholds. Stores commonly use tax calculation tools, and you should confirm your own obligations with your state revenue department or a tax professional.
Integrations. Accounting software, inventory systems, email marketing, reviews, loyalty programs and marketplace feeds all add cost. Each integration is also a recurring subscription in many cases.
Custom features. Subscriptions, wholesale pricing, product configurators, preorders or custom checkout flows move a project from setup to development, with the price to match.
What drives the run cost
Platform plan
Hosted store platforms charge a monthly plan that often rises with features and volume. Open-source stores avoid platform fees, but you pay for hosting, security and maintenance instead.
Payment processing
Processors typically charge a percentage of each sale plus a small fixed amount per transaction. The exact numbers depend on the processor, the card type and your volume. Some platforms charge an additional fee if you use an outside processor instead of theirs. Read the fee schedule before you commit.
Apps and plugins
Reviews, upsells, subscriptions, shipping labels and email tools usually carry monthly or yearly fees. Ten apps at an average of $15 a month is $150 a month, which is $1,800 a year.
Maintenance and security
Stores handle customer data and payments, so updates and backups matter. Ask who is responsible for updates and what happens if a plugin breaks checkout.
Worked example: monthly fees for a small store
Use the Online Store Transaction Fee Calculator with these illustrative numbers:
- Average order: $65
- Orders per month: 200
- Processing fee: 2.9 percent plus $0.30 per order
- Platform plan and apps: $79 a month
Per order, 65 x 0.029 = $1.885, plus $0.30 gives $2.185 in processing fees. For 200 orders, that is about $437. Add $79 for the plan and apps, and the monthly total is about $516. Monthly sales are 200 x 65 = $13,000, so fees consume roughly 4 percent of revenue before product costs, shipping and advertising.
Now see what happens if average order value drops to $25. Per order, 25 x 0.029 = $0.725 plus $0.30 equals $1.025. That is 4.1 percent of the order, and the fixed fee becomes more significant. Low-priced items feel the fixed fee most, so consider bundles or minimum order thresholds.
Payment security and compliance
If you accept cards, you must follow the Payment Card Industry Data Security Standard (PCI DSS), which is maintained by the PCI Security Standards Council. Using a hosted checkout from a reputable processor means card data does not touch your own server, which reduces your burden. Avoid storing card numbers yourself.
Your store should also display clear policies for shipping, returns and privacy. The Federal Trade Commission's rules on advertising and online shopping, including its mail, internet or telephone order merchandise rule, set expectations on shipping time promises. Read the FTC's business guidance and talk to an attorney if you sell regulated products.
Typical ecommerce budget scenarios
| Scenario | Illustrative build | Illustrative monthly running costs |
|---|---|---|
| Starter store, 20 to 50 products, theme-based | $1,500 to $6,000 | $50 to $200 plus processing fees |
| Growing store, 200 to 500 products, some integrations | $6,000 to $25,000 | $150 to $600 plus processing fees |
| Large or custom store, thousands of products or custom features | $25,000 and up | Varies widely by platform and traffic |
Treat these as starting points for conversation. Ask each provider to explain what is and is not included.
Ways to control ecommerce costs
- Launch with your best-selling products, then expand.
- Choose a platform whose built-in features cover your needs before adding apps.
- Review app subscriptions every quarter and cancel what you do not use.
- Compare total fees at your expected volume, not just the headline plan price.
- Keep your product data in a clean spreadsheet so you can move platforms.
- Budget for photography and product descriptions, since they directly influence conversion.
Mistakes to avoid
- Choosing a platform on first-month price alone.
- Forgetting returns, chargebacks and shipping supplies in margin calculations.
- Not testing checkout on a phone.
- Letting a provider own your merchant account or store account.
- Ignoring sales tax setup until the first state notice arrives.
When to consult a professional
Sales tax, product liability and regulated products, such as food, supplements or children's items, can carry legal obligations. A tax professional and an attorney can save much more than they cost.
Frequently asked questions
Is it cheaper to build a store myself?
Cash cost is lower, but setup takes time, and errors in tax, shipping or checkout can be expensive. Many owners build themselves and pay a professional for a one-time review.
Do I need an SSL certificate?
Yes. Secure HTTPS is expected, and most hosted platforms include it. Confirm it is active for the entire site, not only checkout.
Can I switch platforms later?
Often, but it takes work. Product data, customer records and redirects need to be migrated carefully. Keep clean exports.
What fees should I compare between platforms?
Compare monthly plan fees, processing fees, extra charges for outside processors, app costs and any fees on refunds or chargebacks.
Sources
- Federal Trade Commission — rules and guidance for online sellers.
- PCI Security Standards Council — payment card security standards.
- U.S. Small Business Administration — business setup and tax resources.
- Internal Revenue Service — federal tax information for businesses.
