Code and extension review
A list of every core edit, extension, and version on your store, with the risk each one carries.
The Problem
Your OpenCart Store Works, but Nobody Dares Touch It
OpenCart stores often run for years on one version, with core edits nobody wrote down. Then a PHP update, a new gateway, or an extension upgrade breaks something at checkout.
01 · Core edits
Core file edits get overwritten every time you update.
We move each edit into an extension or event that survives updates.
02 · Old version
Your store is stuck on OpenCart 3 or older.
We plan and run the move to OpenCart 4 on a staging copy first.
03 · Extensions
Two extensions clash and break checkout.
We find the clash on staging, then fix, replace, or remove one extension.
04 · Payments
The payment module hasn't been updated in years.
We install a current gateway extension, or build one, and test real refunds.
Your store still takes orders, but the admin looks dated and your host keeps warning about an old PHP version. The last developer changed core files to add features, so updates overwrite them. Two extensions clash at checkout, and the payment module hasn't been updated in years. You'd like to move to OpenCart 4, but nobody can say which extensions will still work. So you leave it alone and hope nothing breaks.
We start with a code review that lists every core edit, extension, and version on your store. Then we move custom changes into proper extensions and events, so updates stop overwriting them. Payment and shipping modules get tested end to end on staging. When you're ready for OpenCart 4, you get a written upgrade plan instead of a guess.
Changes built as extensions
Custom features ship as modules and events, not as edits to OpenCart's own core files.
Upgrade plan you can read
Every extension checked for an OpenCart 4 version, marked keep, replace, rewrite, or drop.
Checkout tested end to end
Test orders through each payment and shipping module before any change reaches your live store.
Our OpenCart Development Process
From Code Review to a Safe Launch in Five Steps
Our OpenCart web development services follow the same five steps, and you approve the plan, the staging store, and the launch window.
We review your OpenCart version, PHP version, extensions, theme, and any core file edits. You get a short report of what's risky, what can stay, and the plan and fixed price that fit your goals.
What's Included
What You Get With OpenCart Module Development and Upgrades
Code review, custom modules, payment and shipping extensions, version upgrades, security cleanup, and testing, all built so your store keeps updating safely.
Compare Options
DeveloperLook vs Freelancer vs Marketplace Extension
A marketplace extension is the cheapest fix when one does exactly what you need. A freelancer suits small tasks. Hire an OpenCart development company for work that must survive the next upgrade.
| Feature | DeveloperLookBest fit | Freelancer | Extension |
|---|---|---|---|
| Planning | Code review and written plan | Varies by person | Install and try |
| Custom features | Built as modules and events | Sometimes core file edits | Only what it offers |
| Version 4 upgrades | Planned, staged, and tested | Case by case | Needs a 4.x release |
| Testing | Test orders on staging | Depends on the freelancer | Tested by the vendor |
| Payment gateways | Configured or built for you | Usually configured | Yes, if one exists |
| Support | 30 to 90 days included | Varies | Vendor support period |
| Ownership | You own all the code | Usually yours | Vendor license terms |
| Cost | From $900, fixed scope | Lower hourly rates | Lowest upfront cost |
DeveloperLook
Freelancer
- Planning
- DeveloperLook: Code review and written planFreelancer: Varies by person
- Custom features
- DeveloperLook: Built as modules and eventsFreelancer: Sometimes core file edits
- Version 4 upgrades
- DeveloperLook: Planned, staged, and testedFreelancer: Case by case
- Testing
- DeveloperLook: Test orders on stagingFreelancer: Depends on the freelancer
- Payment gateways
- DeveloperLook: Configured or built for youFreelancer: Usually configured
- Support
- DeveloperLook: 30 to 90 days includedFreelancer: Varies
- Ownership
- DeveloperLook: You own all the codeFreelancer: Usually yours
- Cost
- DeveloperLook: From $900, fixed scopeFreelancer: Lower hourly rates
Projects We've Built
Ecommerce Store Projects We Have Built
Online stores we have designed and built for fashion, hardware, art, and furniture sellers. Each needed a catalog, cart, and checkout a small team could run.
Fuison Fashion Ecommerce Website and Dashboard
- Fashion
- Dashboard
- E-commerce
Borna's General Hardware Ecommerce Website
- Retail
- E-commerce
- Website
Sir Kenneth Riley Artwork Ecommerce Website
- Art
- E-commerce
- Website
Havenly Furniture Ecommerce Website
- Furniture
- E-commerce
- Dashboard
What Our Clients Say
What Clients Say After Launch
Feedback from teams we have built online stores and websites for.
We had a pretty specific idea of what we wanted our website to become, but I wasn’t sure how easily we could explain all of it to a development team. There were quite a few moving parts, and we were working toward a deadline, so I expected a few things to get lost along the way. That never really happened. They understood what we were trying to achieve, kept us updated throughout the process, and got everything ready within the agreed timeline. The final site feels much easier to navigate, works beautifully on mobile, and is noticeably smoother for our customers. It was a huge relief seeing the original idea actually turn into the website we had in mind.
The mobile experience is probably my favourite part of the new site. We had spent a lot of time making sure the desktop version looked right, and the team kept pushing us to think about how everything would actually feel on a phone too. They were right. The navigation is clean, the interactions feel natural, and everything we’ve tested so far works exactly as it should. They also went through the links, forms, integrations, and other details more than once before launch, which I really appreciated. And even after going live, we could still reach out when something came up. The whole process felt friendly, organised, and surprisingly straightforward.
What I appreciate most is that the website is actually easy for us to manage now. We can update content ourselves instead of sending a developer a message every time we need to change something small. They also paid attention to the technical SEO side, which mattered to us because we didn’t want a new website to create problems for the traffic we already had. I’ve probably asked more questions than I should have since launch, but every question has been handled patiently and without any fuss. The team is easy to work with, they explain things clearly, and when we need something changed, they focus on getting it done rather than making the process complicated.
1,250+
Projects shipped
10+
Years of experience
Top 3%
Upwork Top Rated Plus
5 stars
Average review score
Want results like these?
Tell us what you are building. You get a reply within 24 hours on business days, then a written estimate.
Work Culture
Why Store Owners Trust Us With OpenCart Website Development
OpenCart rewards careful developers and punishes shortcuts. These are the habits that keep your store updatable after we hand it back.
No edits to core files
Every change ships as an extension, event, or theme override. Your store can take OpenCart updates without losing the features you paid for.
Staging before live orders
Tests run on a staging copy, not on the store your customers use. You check the staging store and approve it before anything goes live.
Code in version control
Your custom modules live in a Git repository with readable commits. The next developer, ours or not, can see what changed and why.
Straight talk about OpenCart
If your store would cost less to run on another platform, we'll say so. Sometimes the honest advice is a migration, not another module.
Every module documented
Each module ships with notes on its settings, events, and database tables. You won't need us to explain your own store a year from now.
Your code, your hosting
Hosting, admin, and Git access stay in your name, and every line we write is yours. Our modules carry no license fee.
Overview
What are OpenCart development services for online stores?
DeveloperLook provides OpenCart development services for stores running OpenCart 3 or 4. We build custom modules, connect payment and shipping extensions, fix bugs, and move stores from version 3 to 4 without editing core files. Projects start at $900, most take 1 to 10 weeks, and you own all the code we write.
DEVELOPERLOOK
Project facts · OpenCart Development Services
- Service
- OpenCart Development Services (modules, upgrades, payments, fixes)
- Typical timeline
- 1 to 2 weeks for fixes, 3 to 10 weeks for builds
- Platforms
- OpenCart 2, 3, and 4 on your own hosting
- Built with
- PHP, MySQL, Twig, OpenCart events and extensions
- Experience
- 10+ years of development experience and 1,250+ shipped projects
- Post-launch support
- 30 to 90 days of post-launch support, by plan
- Communication
- Calls in US, UK, and AU business hours
- Starting price
- From $900 USD, fixed scope after a free code review
Reviewed 7 Oct 2026 by Saimul Islam
Good fit
Stores still on OpenCart 3
Your store runs OpenCart 3, your developer has moved on, and nobody can tell you which extensions will survive a move to version 4.
Owners needing a custom feature
You need a feature no marketplace extension offers, such as trade pricing or a quote step, and want OpenCart module development done properly.
Stores with an edited core
Your previous developer changed core files directly, so every update breaks something and you've stopped updating the store altogether.
Stores adding a payment gateway
You're adding Stripe, PayPal, or a local gateway and need the extension set up and tested with real refunds and order statuses.
Agencies with OpenCart clients
Your agency inherited OpenCart clients and wants to hire OpenCart developers on a white-label basis instead of training staff on an older stack.
Not a fit
Ready to leave OpenCart
You've decided OpenCart no longer fits and want a hosted platform. Our Ecommerce Migration Services team moves products, customers, and orders to Shopify or another platform.
Brand-new store
You're launching your first store with no OpenCart history. Our Ecommerce Website Development team compares platforms with you before anything gets built.
Store belongs in WordPress
Your team already runs WordPress and wants the store inside it. Our WooCommerce Development Services team builds that on the site you already have.
Budget under $900
Your budget is under $900 for one small tweak. A vetted extension from the OpenCart Marketplace may cover it, and we'll tell you before we quote.
Not sure we're the right fit?
Book a free call or message us. We'll tell you honestly whether we're the right team.
Pricing
Transparent Starting Prices for OpenCart Development Services
These are starting points in USD. Your final price depends on your OpenCart version, your extensions, and how much custom code is involved, and you get a fixed proposal after a free code review.
For live OpenCart stores that need bugs fixed, one custom module, or a gateway connected.
$900one-time, USD
- Free code and extension review
- Up to 5 fixes or 1 custom module
- Payment or shipping extension set up and tested
- Built with events, no core file edits
- Mobile speed check against a 90+ target
- 30 days of post-launch support
Recommended
For OpenCart 2 or 3 stores moving to OpenCart 4 with products, customers, orders, and URLs kept.
$3,200one-time, USD
- Everything in Fix and Module Sprint
- Fresh OpenCart 4 install, tested on staging
- Products, customers, and orders migrated
- Up to 8 extensions replaced or rewritten
- Theme rebuilt with a speed pass toward 90+
- 60 days of post-launch support
For new or rebuilt OpenCart stores that need a custom theme, several modules, and integrations.
$6,800one-time, USD
- Everything in OpenCart 4 Upgrade
- Custom theme built from your designs
- Up to 5 custom modules
- 2 integrations, such as ERP, CRM, or shipping
- Multi-store or multi-language setup
- 90 days of post-launch support
For Agencies
White-Label OpenCart Development for Agencies
You own the client relationship. We supply the OpenCart engineering: modules, gateway work, fixes, and version upgrades, delivered under your brand. Your clients keep their stores current without you hiring a PHP team for an older platform.
How the partnership works
White label: your client only ever sees your brand
- Your client
- You, the agency
- DeveloperLook
Share the brief
Send the store access, the client's goals, and any deadline you've promised.
- Client needs
- You share the details
- Details received
We review and quote
A code review and a fixed price before any work starts on the store.
- Scope and plan
- Proposal to resell
- Your quoteYOUR LOGO
Build and hand off
Tested changes on staging, a launch window, and white-label notes for your client.
- Done by our team
- Your brand on it
- Handed to your clientDone
Partner with DeveloperLookDelivered under your brand
Stay client-facing
Your clients see your name on every update and report.
OpenCart experts on call
PHP developers who know events, Twig templates, and the extension format.
Predictable delivery
Fixed scopes and dates you can promise your clients with confidence.
Flexible capacity
Add OpenCart help for one client or many without hiring anyone.
The Right Technology for Your Project
Technology Stack
We work inside OpenCart's own stack (PHP, MySQL, and Twig) and test every payment method your store takes before launch.
- OpenCart
PHP
MySQL- Composer
Bootstrap
jQuery
JavaScript
HTML5
CSS3
Stripe
PayPal
Braintree
Google Pay
- cPanel
Cloudflare- GitHub
PageSpeed Insights
FAQ
Frequently Asked Questions
Straight answers on OpenCart costs, security, upgrades from version 3 to 4, payment gateways, and hiring an OpenCart developer.
Saimul IslamFounder & CEO, DeveloperLookStill have questions?
Send a message or book a call with the team.
The OpenCart software is free; you pay for hosting, a domain, any paid extensions or themes, and gateway fees. Development with us starts at $900 for a fix and module sprint. Upgrades to OpenCart 4 start at $3,200, and custom store builds at $6,800. You get a fixed price after a free code review.
Fixes and single modules take 1 to 2 weeks. An upgrade from OpenCart 3 to 4 usually takes 3 to 5 weeks, depending on how many extensions need replacing. A custom OpenCart store with its own theme and integrations takes 6 to 10 weeks. Every timeline includes staging tests before launch.
OpenCart is a free, open-source ecommerce platform written in PHP that you install on your own hosting. It includes a catalog, cart, checkout, customer accounts, and an admin that can run several stores. Extra features come from extensions on the OpenCart Marketplace, and 4.1 is the current release line.
OpenCart is used to run online stores on your own hosting, without a monthly platform fee. It suits small and mid-size catalogs, owners who want full code access, and businesses running several storefronts from one admin. It needs a developer for upgrades and custom features, which is where most of our work comes from.
Yes. OpenCart is free software released under the GNU General Public License, with no license or transaction fees from OpenCart itself. Running a store still costs money: hosting, a domain, paid extensions or themes, your payment gateway's processing fees, and developer time for upgrades and fixes.
Yes, for the right store: a small or mid-size catalog, a team happy to self-host, and a budget for upkeep. It's light and flexible, but you handle hosting and security, and many version 3 extensions have no version 4 release. If you'd rather have hosting and updates handled for you, a hosted platform may suit you better.
OpenCart can run securely, but your setup decides how secure it is. We keep OpenCart and PHP on supported versions, delete the install folder, move the storage folder outside the web root, change the admin path, and remove abandoned extensions. Extensions come only from developers who still update them.
We treat it as a rebuild on a fresh OpenCart 4 install, not an in-place update. Version 4 changed the folder structure and the extension format, with namespaces and an install.json file, so most 3.x extensions need a 4.x release or a rewrite. We migrate products, customers, and orders, rebuild the theme, and keep your SEO URLs.
Through a payment extension: install it, enable it under Payments, and add your gateway's API keys. Many gateways publish an OpenCart extension; when yours doesn't, or it isn't built for your version, we build one with the gateway's API. We test in sandbox mode, including refunds, order statuses, and failed payments.
An OpenCart developer is a PHP developer who knows OpenCart's MVC-L structure, events, Twig templates, and extension format. That knowledge keeps custom features out of core files, so updates stay safe. When you hire OpenCart developers from us, you get that team plus a staging process, version control, and written notes on every module.
Saimul IslamFounder & CEO, DeveloperLookStill have questions?
Send a message or book a call with the team.
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