The Total Cost of Owning an Online Store Over Three Years

Ecommerce total cost of ownership is everything you spend to build, run and improve your online store over a set period, usually three years. It includes the obvious costs, such as the build and the platform subscription, and the easily forgotten ones: apps, payment fees, hosting, security updates, integrations, content, marketing tools and your own team's time. Comparing platforms or suppliers on the build price alone often leads to the wrong decision. Comparing the three-year total shows which option really costs less for a business like yours.

Why three years is the right horizon

A three-year view also matches how many businesses plan and budget. It lines up with typical contract terms, depreciation of larger investments and the point at which most stores review their platform anyway.

Most stores are rebuilt or significantly reworked every few years, as the business, technology and customer expectations change. Three years is long enough to capture the real running costs and short enough to estimate with reasonable confidence.

Over that period, the pattern of spending differs between options. A store on a hosted platform may be cheap to build but carry rising monthly fees. A store on an open-source platform may cost more to build but less each month. Only by adding everything up over the same period can you see which is cheaper overall, and how the answer changes as sales grow.

Our guide to ecommerce website cost explains the build budget in detail; this guide focuses on everything that comes after.

The cost categories to include

1. Build and launch

Discovery, design, development, integrations, data migration, content, testing and launch support. This is a one-off cost, though large changes later may add more.

2. Platform and licences

Subscription plans for hosted platforms, licence fees for enterprise editions, and yearly renewals for themes or core tools. Note how fees change as you move up plans or pass revenue thresholds, because these steps often arrive sooner than a growing business expects.

3. Apps and extensions

Monthly app subscriptions on hosted platforms, or extension licences and renewals on open-source platforms. Reviews, search, email, loyalty, subscriptions, shipping tools and B2B features are common examples.

4. Hosting and infrastructure

Servers, content delivery network, backups, monitoring and security services. Hosted platforms include most of this; open-source stores pay for it separately.

5. Payments

Payment processing fees on every order, any platform transaction fees, currency conversion costs, chargeback fees and fees for buy now, pay later services. These rise with sales, so model them at your expected revenue each year.

6. Maintenance and improvement

Security patches, platform updates, extension updates, bug fixes and ongoing improvements. Even hosted platforms need theme updates, app changes and occasional development.

7. Integrations

Ongoing costs for connectors, middleware subscriptions and changes when connected systems are updated.

8. People

This is the category most often left out, because nobody receives an invoice for it. The time your team spends running the store: product updates, order handling, customer service, and any manual work caused by missing features or poor integration. Value these hours at what they cost the business, including the work they could be doing instead, such as growing sales or improving service.

A simple three-year worksheet

Use a table like this for each option you are considering. Fill in your own estimates and quotes, and keep a separate note of where each figure came from, such as a supplier quote, a published price list or an internal estimate.

Be honest about uncertainty. Where you are unsure of a cost, write a low and a high estimate and use the middle, then note the assumption beside it. When you revisit the worksheet next year, those notes show which guesses were right and help you improve the next estimate.

Base sales-related costs, such as payment fees, on a realistic forecast for each year. If you expect strong growth, run a second version with higher sales to see how each option scales.

Hidden costs that catch owners out

• App creep. One app at a time feels affordable, but stores often end up paying for many apps, some of which overlap or are no longer used.
• Fees that grow with revenue. Percentage-based fees rise as you succeed, sometimes faster than expected.
• Upgrade projects. Major platform or theme upgrades can be significant pieces of work every few years.
• Security incidents. Clean-up, lost sales and notification costs after a breach can dwarf years of maintenance. Card security obligations, set by the PCI Security Standards Council, also carry compliance effort.
• Workarounds. Staff time spent on manual tasks because a feature or integration is missing.
• Switching costs. If the platform does not fit, migrating later costs time, money and sometimes search traffic.
• Peak readiness. Extra hosting capacity or performance work before big sales events.

Comparing options fairly

When comparing platforms or suppliers, keep the comparison honest:

1. Use the same requirements for every option, based on your must-haves.
2. Price everything needed to meet them, including apps or custom work.
3. Use the same sales forecast for fee calculations.
4. Include staff time for each option, especially where one option needs more manual work.
5. Consider risk: how likely is each option to need a costly change before year three?

Ask each supplier to state their assumptions in writing, such as the number of apps included, the hosting size or the hours of maintenance per month. Assumptions are where most cost differences hide.

Our comparisons of Magento, Shopify and WooCommerce and open-source versus SaaS e-commerce explain how cost patterns differ between platform types.

Ways to reduce total cost of ownership

• Choose the right platform for your complexity. Overbuying or underbuying both cost money.
• Audit apps and extensions every six months and remove what you do not use.
• Keep customisation clean so upgrades are cheaper.
• Automate repetitive work through integrations rather than staff time.
• Plan maintenance as a steady monthly amount instead of emergency fixes.
• Negotiate payment fees as your volume grows.
• Invest in good product data, which reduces work across search, feeds and marketplaces.
• Review supplier contracts each year, including hosting, support and software renewals, and compare them with current market prices.

Ecommerce total cost of ownership: a worked example

Consider a growing homeware brand comparing two options: a hosted platform with a premium theme and several apps, and an open-source platform with a custom build.

Option A: hosted platform

The build is quicker and cheaper, because the theme does most of the work. Year one includes the subscription, around eight apps for reviews, search, subscriptions, loyalty, email, bundles, delivery dates and translations, and payment fees. As sales grow in years two and three, the brand moves to a higher plan and some apps move to higher tiers based on order volume. By year three, recurring fees form most of the total.

Option B: open-source platform

The build costs more, because features are configured and some are custom-built rather than rented. Year one also includes hosting and a maintenance plan. Recurring costs stay flatter as sales grow, because there are fewer usage-based fees, but there is an upgrade project planned for year three.

What the comparison shows

For this brand, Option A is cheaper in year one and Option B becomes cheaper by year three, mainly because of app and fee growth on Option A. A brand with slower growth and simpler needs might find the opposite. The point of the worksheet is not to prove one platform is always cheaper; it is to show where the lines cross for your business.

Look at value as well as cost

The cheapest option is not automatically the best investment. A higher-cost option that converts better, saves staff hours or opens new markets may return far more than it costs.

• Revenue effects: faster pages, better search and smoother checkout can lift conversion.
• Efficiency gains: integrations that remove manual order entry or stock updates save real time every week.
• Growth options: the ability to add countries, B2B accounts or marketplaces without rebuilding.
• Risk reduction: better security, backups and support reduce the chance of costly incidents.

Estimate these benefits conservatively, and set them beside the cost totals. A decision based on both sides of the ledger is far more reliable than one based on cost alone.

Who should help build the estimate

A good estimate draws on several people. Finance knows payment fees, current software costs and how to value staff time. Operations knows the manual work behind each order. Marketing knows which tools and apps it depends on. Your developer or agency can estimate build, hosting and maintenance. Bring them together for an hour with the worksheet, and you will usually uncover costs that no single person would have listed.

Frequently asked questions

Want an honest three-year cost comparison for your options? Send us your requirements and sales plans, and we will help you build a total cost of ownership model you can trust.