Custom PrestaShop Module Development

Technology partners

Starting point

Why does a ready-made module “almost fit”, and still cost you?

PrestaShop modules are software that adds a single feature to your store without touching the platform's core. You buy a ready-made module once, but the three costs below come back every year and are not in the marketplace price.

Your process, bent to fit someone else's module

Instead of fitting the tool to how your company works, you start working the way the module's author imagined. The most expensive compromises are the ones everyone treats as normal after a year and stops counting.

Three modules for one feature

Filters from one, translations from another, invoices from a third. Each one loads its own code and its own screen in the panel, and together they can slow the store down more than the feature they were bought for is worth.

An update with no author around

A module stops being developed or breaks with a new PrestaShop version, and changing its code usually means losing the author's support and updates. Then you either stay on the old store version, or buy a replacement for €30-200 and lose more hours checking what else stopped working.

Our modules

Modules we have already built

The first two were commissioned by software makers, companies with their own development teams who know exactly what to ask for. The third we sell ourselves on PrestaShop's marketplace. The fourth shows how much of this code we maintain today.

PrestaShop 1.7-8.x

Commissioned by a marketing automation platform maker

ExpertSender Official

A module ExpertSender's clients use to connect their PrestaShop store to the ECDP platform. Field mapping for customers, orders, products and consents to attributes on the other side, listening for basket events, a sync queue with a cron job and a manual trigger, history import going back two years, an API error log. Six stages signed off one by one, from January to December 2024.

Module documentation ›

PrestaShop 1.6-8.x

Commissioned by the maker of a sales management system

Rebuild of base.'s official module

base. handed us their integration module together with repository access, and we took it apart. PSR-4 namespacing, logic split into actions, DTOs and services behind interfaces, a shared endpoint prefix, tests on 1.7.x and 8.x, and a pass through the PrestaShop Addons validator. Backward compatibility with 1.6 and PHP 5.6 was a separate stage.

Integration on their side ›

PrestaShop 1.7-9.1

Our own product, sold on the marketplace

GPSR Compliance on PrestaShop Addons

Adds the manufacturer and importer data that the EU's General Product Safety Regulation requires to the product page. We have sold it on PrestaShop's official marketplace since December 2024, with the latest release in April 2026. It passes the Addons compliance check with a “no core overrides” result, the same rule we apply to custom-built modules.

See it on Addons ›

50 stores

That much module code we maintain today

250+ of our own modules across fifty stores

Not the occasional module, but a standing practice. It runs deepest on the Surf Inc. store, where 76 of the 196 installed modules are ours: base. integration, returns from the customer account, our own catalogue filtering, size charts and structured data. On other stores we maintain several dozen of our own modules each.

See the portfolio ›

Every one of these modules uses PrestaShop's official extension points and does not change a single core file. That is the same rule JustIdea applies to a custom module, not a separate standard for show.

Scope

PrestaShop modules: what we do with your store's code

✓ A custom module: one feature that no ready-made module offers
✓ Modifying a module you already have, including one bought elsewhere, after checking its licence and the impact on updates. When a modification would cut off the update path, we compare it against writing a module from scratch.
✓ Configuring and connecting modules bought on Addons

How it works, step by step

From brief to a module live in production

Three stages. After the first one you know the amount and the scope, so the code starts only after your decision, not from a price range.

1
Brief and a fixed quote

a few days

You describe what should happen in the store, and we ask about edge cases: what happens on a return, what happens when stock runs out, what happens if the other system errors. We come back with a scope and one amount. If a ready-made module handles it more cheaply, we say so right here.
2
Build and code review

1-2 weeks

The module hooks into PrestaShop's official extension points, not into core files, so it does not block updates. A second person on the team reads the code before you see it.
3
Sign-off and go-live

a few days

Tests on a copy of the store, fixes from sign-off, only then production. At the end you get the code, the repository and documentation, everything anyone would need after us.

Where this service ends

When a custom module, and when a ready-made one from Addons?

Short answer

A ready-made module wins when it does exactly what you need and has an active author. A custom module makes sense when someone works around the missing piece by hand on every order, or when the process is yours alone and nobody sells it off the shelf.

We build a single feature inside PrestaShop, on its official extension points, not a separate system next to the store. The code, repository and documentation are yours from the day of sign-off.

A calculation of handling hours decides between a ready-made module and one built for the store's own process

This is the right service

The feature comes from your own process, not from a generic store problem.
A ready-made module needs workarounds that cost handling hours every week.
A module you bought stopped working after an update, and its author is not responding.

Start somewhere else

You need several modules tied into one ERP process: that is a custom solution.
It's about ongoing fixes and small changes: that is post-launch care.
You want to rebuild the whole store: that is a PrestaShop implementation.

Types of modules

Four kinds of requests we get most often

“Module” is a word that sometimes means a simple €50 feature, and sometimes a warehouse system integration worth hundreds of hours. Below is the breakdown we use when quoting, so from the first call it is clear what we are talking about.

Integration

Connecting the store to a system you already have: ERP, warehouse, accounting software, a wholesaler or a marketplace. The most expensive kind, because the cost sits not in the module itself but in data mapping and handling exceptions on the other side.

Sales

Anything that changes basket, delivery or promotion behaviour: free-shipping thresholds, bundles, price variants, discount rules. This is the kind ordered most often, because its effect can be measured in sales data: conversion, average basket value or promotion use.

B2B

Per-account price lists, prices in several currencies with no conversion, purchase limits, orders placed against a balance. PrestaShop does not have this in its core, and no ready-made module knows your commercial policy.

Fixing someone else's code

A marketplace module that stopped working after an update, or a core modification made years ago that now blocks a version upgrade. We start with a repair quote alongside a from-scratch quote, because the second one is sometimes cheaper.

What it costs

Prices you pay once, and ones that come back every year

We quote a custom module after the brief and give one amount before the first line of code is written. A ready-made marketplace module you buy once, but any major PrestaShop update can force an extra payment for adjustment or a fresh purchase. The three figures below show what the bill is made of, so you can compare both options on the same terms.

€80

Hourly rate for a PrestaShop developer on a module

€30-200

That's what a ready-made market module costs, if one happens to exist

fixed

The module billed after the brief, instead of an open-ended list of hours

Four rules that decide how much a module costs over the years

Zero changes to the platform core

The module uses official extension points: hooks, and in newer versions also Symfony services, depending on the feature. We do not modify PrestaShop's files. A core modification works until the first update, and after that either blocks a version upgrade or disappears together with the overwritten file. This is the most common reason a store is still on a version from several years ago, and the most expensive thing to undo after the fact.

Compatibility with the version your store runs on

We build for a specific PrestaShop branch and say plainly which versions the module will not support. A big version jump changes some of the underlying mechanisms, so instead of promising compatibility with everything, we plan a module review for whenever you upgrade the store, and quote it at that point.

Documentation and coding standards on handover

The code follows the platform's standards, with readable names and comments wherever a decision is not obvious. On top of that comes documentation: what the module does, where you configure it, what it does not cover. Thanks to that, the next contractor does not start by reverse-engineering someone else's intentions, which can cost more than writing the module from scratch.

Performance impact measured before launch

Before production we measure the module's overhead on the paths it touches: listings, the product page, the basket, orders, the back office or background jobs. We check execution time, the number of queries and external API calls, instead of assuming that simply installing it will slow the store down. If the same feature can be handled more cheaply on the server side, we say so instead of billing the hours.

Basics

What is a PrestaShop module, and what is an add-on?

A PrestaShop module is a separate piece of software that adds a feature to your store without changing the platform's core. You will also see it called an add-on or an extension, and both names mean the same thing. You install it from the store panel, configure it in its own tab, and can independently disable or uninstall it, with no changes to core files. That is PrestaShop's advantage over a subscription platform: you do not wait on a vendor for a new feature, you add it yourself. JustIdea picks a module from the marketplace, or builds one to order when the feature comes straight from your own process.

From the official marketplace

PrestaShop Addons and various developers' own shops list several thousand ready-made modules, including free ones. They work well for standard features: reviews, banners, simple promotions. The downside is that they solve the problem the way their author imagined it, not the way your company actually works.

Built to order

For when the feature comes from your own process: a product configurator, a price list that depends on the account, stock levels synced with an ERP every fifteen minutes. The code is built around your rules, it is yours, and there are no licence fees for continued use.

Supporting sales and marketing

A separate family, where the module's job is to lift conversion or visibility: basket recommendations, free-shipping thresholds, Google Ads and Merchant Center integration, structured data for search results. Here the effect shows up in the numbers, so the spend is easier to justify.

Installation, and what comes after

Installing it takes a few minutes from the panel, and the real work starts afterwards: configuring it for your catalogue, testing it on a copy of the store, and measuring how much it adds to page load time. Every platform update is a moment when that needs repeating.

Other services

When it's bigger than one module

A module solves a single store feature. If your list has several items at once, or it's about extending the whole PrestaShop store, start with one of these three pages.

Custom solutions

Several modules tied into one process: ERP and CRM integrations, B2B logic and sales automation built around the client's process.

View ›

Post-launch care

Technical care for a PrestaShop store in an hours package: updates, monitoring integrations and performance, development, and a response time (SLA) in the contract.

View ›

PrestaShop stores

Online store implementations on PrestaShop: migrations without losing rankings, ERP integrations and technical support after launch.

View ›

Sign-off

What “done” means for a module here

We hand over a module only once it meets six conditions. We hold ourselves to the same ones for the module we sell ourselves on PrestaShop Addons.

Code review by a second person

Before you see the code, a second person on the team reads it, not just its author.

Tests on a copy of the store

We test the module on a copy of your store, with fixes from sign-off, and only then does it go to production.

Performance overhead measured

You know how much the module adds to load time on the paths it touches, before it is switched on for customers.

A declared version range

Before we start, we agree which PrestaShop versions the module should run on, and say plainly which ones it will not support.

The PrestaShop Addons validator

Modules distributed further pass the marketplace compliance check, just like our integrations and the GPSR module.

Code, repository and documentation

At sign-off you get the full package, letting any future contractor start working without reverse-engineering someone else's intentions.

Client feedback

What companies selling on PrestaShop say about us

We do not collect separate reviews for modules alone, so the voice here belongs to clients whose stores we run.

„

JustIdea is a company that always finds a solution to a problem.

Daniel TurkowiakArs Longa, publishing and online sales

„

JustIdea Agency built us an online store that not only fully met our expectations, but has also become a model for our competitors to follow.

Adrian KomenderskiBioOrganika, natural cosmetics

„

If you are looking for the lowest price, you will probably find it cheaper elsewhere, but this is simply solid work. I have worked with them for over 1.5 years now and have no plans to change that.

Dominik GrochCENTROBUD, building materials and installations

Client reviews

The code stays in your store for years, us included

You work with a module through update after update, so the question is not “will it work”, but “can you still work with it in year three”. We do not collect separate ratings for modules alone, so the average below covers the whole agency.

4.96 / 5

weighted average of 224 reviews across three platforms. Clients gave them, and each site below links to the profile with the full text of every review.

Read the reviews

4.97 / 5

156 reviews on our Google Business Profile

See the profile

5.0 / 5

33 reviews on our Facebook page

See the profile

4.9 / 5

35 B2B reviews, each verified in a call with the client

See the profile

Certifications and partnerships

A module that does not block future PrestaShop versions

The most expensive module is the one you have to write a second time after a platform update. Below are the statuses that give us the knowledge of where in the code it is safe to plug in, and where the safe boundary of the core ends.

PrestaShop Expert ★★★

PrestaShop, agency programme

The three stars of the agency programme come from implementations vetted by the platform's own maker. When a bug sits inside PrestaShop itself, we have a channel to report it there, instead of bolting a workaround onto your store's code.

Top E-commerce Developers Kraków 2026

Clutch, e-commerce developer ranking

Clutch calls the author of every review before publishing it, so this listing stands on code that has already worked at a client's site, not on a directory submission.

base. (BaseLinker)

BaseLinker, integration partnership

The most commonly ordered module is the one that gets the store talking to a warehouse or a carrier. The integration partnership gives us documentation and support on base.'s side, instead of guessing from API responses.

Doubts before working with us

Four things we hear before building a module

We answer every one of them with a calculation of hours, not with a belief that custom code is inherently better.

„A €50 module will do the same thing”

Often, yes, and then we recommend it. We build a custom module when a ready-made one covers 90% of what is needed, and the missing 10% costs someone hours of manual work every week, working around the gap on every order. What decides which option is cheaper is the number of those hours, not code quality.

„A custom module will break after an update”

It is usually modules that tamper with the core that break, and we do not write those. Because we do not change core files, a platform update does not overwrite our code. Before a major version change we test the module on a copy of the store before you touch production.

„We'll end up locked in to one contractor”

The module's code is yours, together with documentation and a repository on your account. You can hand it to another company the day you decide to. Lock-in comes from missing documentation, not from someone else having written the code.

„We don't know what it will cost”

After the brief you get a fixed quote, not a range of hours. The €80 net hourly rate applies to changes that come up after sign-off, and we tell you about every one before we make it.

FAQ

PrestaShop modules: questions before you decide

How much does a custom PrestaShop module cost?

The rate is €80 net an hour, and after the brief you get a fixed quote, so you know the amount before you start. A simple module usually takes a dozen or so hours, while an extensive integration with a system on the other side can run into the hundreds.

When is it better to buy a ready-made module, and when to order a custom one?

A ready-made module makes sense when it does exactly what you need, and it costs €30-200. A custom module pays off when someone else's code needs bending to fit: that can be more expensive than writing your own, and the cost comes back with every update.

Do you sell your own PrestaShop modules?

Yes. The GPSR module, which adds the manufacturer and importer data required by the EU's product safety regulation, has been sold by JustIdea on PrestaShop's official Addons marketplace since December 2024, compatible with PrestaShop 1.7.0 through 9.1. We have maintained it for years across other people's stores, and that is where the rule behind every custom module we deliver comes from: no core overrides.

What about PrestaShop updates, will the module stop working?

For minor updates, the module usually needs no changes, because we use official extension points and do not modify the core. For a major version change, we plan a module review and a test on a copy of the store, and that is one of the things post-launch care covers.

How long does it take to build a custom PrestaShop module?

A typical single module usually takes 1-3 weeks from brief to launch: a few days for the brief and quote, 1-2 weeks for coding and review, a few days for sign-off and going live. Integrations with systems on the other side take longer, because their timeline depends on access and the scope of data mapping.

Who owns the code of a module you build for me?

You do. You get the full source code together with documentation, and you can hand it to any other contractor. There are no licence fees for continued use and no dependency on our server. That is the real difference between a custom-built module and one bought on a marketplace.

When do you advise against building a module?

When a ready-made module for €30 to €200 does the same job well enough, and the difference is about convenience, not process. We also advise against it for a temporary need: handling one promotion with configuration or by hand is cheaper than maintaining code for years afterwards.

What about modules I bought earlier that stopped working?

We take them on at €80 net an hour, on the same terms as custom code. We start with a comparison: how much a repair costs against writing the feature from scratch. For a module abandoned by its author, the second option is usually cheaper over a year.

Describe the feature, and we'll check if it needs building

A few sentences are enough: what should happen in the store and which system it needs to connect to. We come back with a recommendation: a ready-made module, a custom one, or a bigger solution, and for a module, with a fixed quote.

A technical audit report with recommendations ranked by priority, and a three-year TCO calculation for the store

Book a module quote Does the store carry a lot of old, third-party code? Then we start with a technical audit: €860 net, 10 working days.

Book a module quote

Custom PrestaShop modules built for your process

Why does a ready-made module “almost fit”, and still cost you?

Your process, bent to fit someone else's module

Three modules for one feature

An update with no author around

Modules we have already built

ExpertSender Official

Rebuild of base.'s official module

GPSR Compliance on PrestaShop Addons

250+ of our own modules across fifty stores

PrestaShop modules: what we do with your store's code

From brief to a module live in production

Brief and a fixed quote

Build and code review

Sign-off and go-live

When a custom module, and when a ready-made one from Addons?

This is the right service

Start somewhere else

Four kinds of requests we get most often

Integration

Sales

B2B

Fixing someone else's code

Prices you pay once, and ones that come back every year

Four rules that decide how much a module costs over the years

Zero changes to the platform core

Compatibility with the version your store runs on

Documentation and coding standards on handover

Performance impact measured before launch

What is a PrestaShop module, and what is an add-on?

When it's bigger than one module

Custom solutions

Post-launch care

PrestaShop stores

What “done” means for a module here

Code review by a second person

Tests on a copy of the store

Performance overhead measured

A declared version range

The PrestaShop Addons validator

Code, repository and documentation

What companies selling on PrestaShop say about us

The code stays in your store for years, us included

A module that does not block future PrestaShop versions

PrestaShop Expert ★★★

Top E-commerce Developers Kraków 2026

base. (BaseLinker)

Four things we hear before building a module

„A €50 module will do the same thing”

„A custom module will break after an update”

„We'll end up locked in to one contractor”

„We don't know what it will cost”

PrestaShop modules: questions before you decide

How much does a custom PrestaShop module cost?

When is it better to buy a ready-made module, and when to order a custom one?

Do you sell your own PrestaShop modules?

What about PrestaShop updates, will the module stop working?

How long does it take to build a custom PrestaShop module?

Who owns the code of a module you build for me?

When do you advise against building a module?

What about modules I bought earlier that stopped working?

Describe the feature, and we'll check if it needs building

A conversation about your numbers: 30 minutes

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A 30-minute conversation