---
title: TYPO3 Custom Extension Development Service
url: "https://t3planet.de/en/custom-typo3-extension"
description: "Tailor your TYPO3 site's functionality with custom extensions, designed to meet your specific needs. Try Now!"
date: 2024-03-14
modified: 2025-11-22
lastUpdated: 2026-04-04
---
# TYPO3 Custom Extension Development Service
1. [Home](https://t3planet.de/en/)
2. [Our Services](https://t3planet.de/en/typo3-support-products)
3. [For Decision Makers](https://t3planet.de/en/typo3-decision-makers)
4. Custom Extension
Custom Development Extensions
=============================
Are you looking to enhance the functionality of your TYPO3 website? Do you have specific requirements that can't be met with off-the-shelf extensions? Welcome to our TYPO3 Extension Development Service, where we specialise in creating custom TYPO3 extensions that are designed to fit your unique needs.
We use modern TYPO3 resources to deliver innovative solutions such as **Domain-Driven Design, MVC Model, Extbase/Fluid, Frontend Plugins and Backend Modules** etc.
[ Free Consulting ](https://calendly.com/t3planet_de) [ Starting at €999 ](#c6297)
**Bestseller TYPO3 Extensions**
-------------------------------
Team T3Planet takes pride in having a first-ever store in the TYPO3 world. Our customers loved TYPO3 extensions such as Slider Revolution, T3OpanAI, Backup, and more. We encourage you to explore our popular TYPO3 extensions to trust our expertise.
[Explore TYPO3 Extensions](https://t3planet.de/en/typo3-extensions)
Ready-made vs Custom Extension
------------------------------
What are the advantages of custom extension compared to ready-made extension?
- Specific Functionality
- Performance
- Scalability
- Maintainability
- Security
- Integration with External Systems
- Brand Consistency
- Monetization
- Tailored User Experience
What's Included in Service?
---------------------------
### Personalization
We develop Custom TYPO3 extensions allowing you to customise your website or application to meet your unique requirements, offering personalised features and experiences for your users.
### Extend TYPO3 Core
Customise and expand TYPO3's core functionalities making sure your website aligns perfectly with your project's needs while staying compatible with future updates.
### Extend TYPO3 Core Extensions
Extending or Modifying existing TYPO3 core extensions to match your specific use cases, maintaining the advantages of these extensions while adapting them to your needs.
### Frontend Plugins
We create interactive elements for your website's front end to provide a unique and engaging user experience, ensuring your visitors stay longer and interact more with your content.
### Backend Modules
Develop custom backend modules to channelise administrative tasks, automate processes, and provide intuitive interfaces customised to your organisation's workflow.
### Extend TYPO3 Third-party Extensions
We Bridge functionality gaps with third-party extensions by customising them to match your requirements.
Why T3Planet?
-------------
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### Bestseller TYPO3 Extensions
We are proud to have the first-ever TYPO3 templates store, with the world’s bestseller TYPO3 extensions like T3OpenAI, Backup, News Comments etc.
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### Quality Assurance
At T3Planet, quality is paramount. Our templates are rigorously tested to ensure they are error-free, responsive, and perform flawlessly.
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### Timely Delivery
We understand the importance of deadlines. Rest assured, your project will be delivered promptly, as promised.
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### Customer-Centric Approach
Your satisfaction is our ultimate goal. We are dedicated to meeting your needs and exceeding your expectations.
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### We're TYPO3 Certified
TCCD (certified developers) & TCCI (certified integrators) resources from more than 7 years of experience.
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### Money Back Guarantee!
We offer Money Back Guarantee not only for TYPO3 Products but services as well, which shows our commitment to providing top-notch service.
3 Steps Approach
------------------
### Step 1.
Analysis, Proposal & Planning
### Step 2.
TYPO3 Extension Development
### Step 3.
QA, Delivery & Support
Step 1. Analysis, Proposal & Planning
-----------------------------------------
We conduct a technical project analysis at the initial stage to create an estimate. Upon your confirmation, we will kick off the
project and strategize with local and staging server environments to ensure smooth TYPO3 extension development and deployment.
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Template_Customisation/documents/1.2-Project-Proposal.jpg)
#### 1.1 Requirement Specification
In-depth review of your requirement specification of your business needs. Prepare questions and confirmations.
[View Requirement](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Template_Customisation/documents/3.1_Technical_Standard_Report__TSR_.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/1.2-Project-Proposal.jpg)
#### 1.2 Project Proposal
You’ll receive a detailed proposal, which includes Scope of work (SOW), estimation, planning, approach, and contract details.
[Download Document](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/1.2_Project_Proposal.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/1.3-Kick-off_-Planning-_-Local-setup.jpg)
#### 1.3 Kick-off, Planning & Local-setup
Initiate the project with a kick-off meeting, schedule a project, and set up locally with Docker/DDEV, Git, composer, etc.
[View Schedules](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/1.3_Kick-off__Planning___Local-setup.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/1.4-Technical-_-Backend-Usability.jpg)
#### 1.4 Technical & Backend Usability
The team prepare technical specification and backend TCA and usability of default CRUD operations of backend management.
[Download Report](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/1.4_Technical___Backend_Usability.pdf)
Step 2. TYPO3 Extension Development
-----------------------------------
We start the TYPO3 extension development process by configuring the extension key, crafting backend TCA, and developing
frontend plugins. Ultimately, the developer will conduct a thorough checklist before handing it over to the QA team.
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.1-Initiate-Extension.jpg)
#### 2.1 Initiate Extension
Kick-start the extension using the extension builder by defining the proper unique extension key and database diagram.
[View Requirement](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.1_Initiate_Extension.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.2-Backend-Modules-Development.jpg)
#### 2.2 Backend Modules Development
Convert database diagram to TCA (Table Configuration Array) to manage records in TYPO3 list module and custom module.
[Sample Backend TCA](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.2_Backend_Modules_Development.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.3-Frontend-Plugin-Integration.jpg)
#### 2.3 Frontend Plugin Integration
Based on business needs, develop custom frontend plugins with Flexform/TS options and Extbase/Fluid technologies.
[View Plugin Configuration](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.3_Frontend_Plugin_Integration.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.4-Developer%E2%80%99s-Checklist.jpg)
#### 2.4 Checklist of DoD
Developers follow a concrete checklist of DoD (Definition of Done) before submitting a project to the QA team.
[Download DoD Checklist](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/2.4_Developer%E2%80%99s_Checklist.pdf)
Step 3. QA, Delivery & Support
----------------------------------
In the final stage, as part of our commitment to ensuring quality, we will furnish various reports such
as TSR (technical standard report), QSR (quality score report) and deliver the developed TYPO3 extension for Go-live!
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.1-Technical-Standard-Report-_TSR_.jpg)
#### 3.1 Technical Standard Report (TSR)
Prepare a technical report including composer support, scanned extension files, system error log, localization, etc.
[Download TSR Report](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.1_Technical_Standard_Report__TSR_.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.2-Code-Review-Report-_CRR_.jpg)
#### 3.2 Code Review Report (CRR)
The report contains TYPO3 code review points like PHP-PSR, PHP Stan, PHP-CS-Fixer, and TS/XLIFF/Fluid lints.
[Download SSR Report](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.2_Code_Review_Report__CRR_.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.3-Quality-Score-Report-_QSR_.jpg)
#### 3.3 Quality Score (QSR)
The QA team tests 1:1 testing with UI/UX design, functionality, cross-platform, etc. The report contains bugs/issues status.
[Download QSR Report](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.3_Quality_Score_Report__QSR_.pdf)
[  ](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.4-Go-live-_-Support.jpg)
#### 3.4 Delivery & Support
Deliver and deploy to the staging server with post-checklist verification and provide 30 days of free support.
[View Go-live Checklist](https://t3planet.de/fileadmin/ns_theme_t3planet/Services/Extension_Customisation/Steps_Doc_pdf/3.4_Go-live___Support.pdf)
Certified TYPO3 Agency
-----------------------
[  ](https://t3planet.de/en/typo3-community-participation "TYPO3 Award Winning")
[  ](https://t3planet.de/en/typo3-community-participation "TYPO3 Certiied Developers")
[  ](https://t3planet.de/en/typo3-community-participation "TYPO3 Certified Integrator")
Pricing Packages
----------------
Basic
- Low Complexity of Features
- 1 Backend Records
- 1 Frontend Plugins
- No API Integration
- Compatible LTS
- No Scheduer Task
- Basic SEO
- DevOps - Git/Docker/DDEV
- No Backend Manual
- Assign a dedicated technical manager
- 30 business days support period
- **20 hours** of development & support
[Buy Now €999](https://t3planet.shop/subscribe/65fa8368bf7cc96d66ba2b51/basic-20-hours-package)
Standard
- Medium Complexity of Features
- 3 Backend Records
- 3 Frontend Plugins
- 1 API Request
- Compatible LTS/ELTS
- No Scheduler Task
- Advanced SEO
- DevOps - Git/Docker/DDEV
- Backend Manual
- Assign a dedicated technical manager
- 45 business days support period
- **40 hours** of development & support
[Buy Now €2199](https://t3planet.shop/subscribe/65fa8391628ddf6d7e9c6290/standard-40-hours-package)
Premium
- High Complexity of Features
- 5 Backend Records
- 5 Frontend Plugins
- 1 API Request/Response
- Compatible LTS/ELTS
- 1 Scheduler Cronjob
- Advanced SEO
- DevOps - Git/Docker/DDEV
- Backend Manual
- Assign a dedicated technical manager
- 60 business days support period
- **80 hours** of development & support
[Buy Now €4799](https://t3planet.shop/subscribe/65fa83c3bf7cc96d66ba2b73/premium-80-hours-package)
[ Get Free Quote! ](https://t3planet.de/en/contact)
**Requirements:**
-----------------
1. You must provide a detailed business requirement specification for your wanted TYPO3 custom extension.
2. We will conduct a thorough design & requirement analysis.
3. Subsequently, we will provide you with an accurate re-estimation.
### 14
TYPO3 Years
### 200
Extension Projects
### 35
TYPO3 Members
### 50
Ready-made Extensions
Happy Customers
----------------
Customers Review
----------------
250+ Premium customers from beginners to industry leaders love T3Planet!
### 4.8 / 5
#### Niklas Neustadt
Your custom TYPO3 extension made a significant difference in our e-commerce platform's functionality. It not only simplified our product management but also boosted our sales. Your team's commitment to quality and innovation is unmatched.
Your team's custom TYPO3 extension not only met but exceeded our project requirements. It was a pleasure working with such a skilled and responsive team. We look forward to future collaborations.
#### Matthias Bieber
TYPO3 extension you designed has improved our workflow efficiency. Your professionalism and technical expertise are highly appreciated.
#### Thomas Kluge
Their team's outstanding communication, keen eye for detail, and steadfast dedication to excellence have positioned them as a cornerstone of our project's success. We are deeply appreciative of their invaluable contribution and look forward to continuing our fruitful collaboration.
#### Sophia Schuster
Great communication and expertise! T3Planet delivered custom TYPO3 extension services that exceeded our expectations. Their team's responsiveness and technical proficiency made the entire process smooth and efficient.
#### Marco Schneider
T3Planet's custom TYPO3 extension services are exceptional! They helped me extend TYPO3's core functionalities to perfectly align with my project's needs. Their team's expertise in Domain-Driven Design, MVC Model, and Extbase/Fluid technology ensured a smooth development process and a high-quality end product. I'm extremely satisfied with their services and would choose T3Planet again without hesitation.
#### Uta Schweitzer
Working with T3Planet on my TYPO3 extension was a fantastic experience! They took the time to understand my business needs and provided expert guidance and support throughout the development process. The end result was a high-quality extension that seamlessly integrated with my TYPO3 website and provided the functionality I needed.
#### Luca Drescher
I was initially hesitant about customizing my TYPO3 extensions, but T3Planet's satisfaction guarantee gave me confidence. They worked closely with me to ensure everything met my expectations. The final result was fantastic, and I’m grateful for their dedication to my project!
#### Michelle Muller
Thanks to T3Planet, my TYPO3 extensions now have streamlined functionality that enhances user experience. They listened to my requirements and implemented changes efficiently. The result is a more intuitive interface that my users love. I’m thrilled with the improvements!
#### Daniela Fuhrmann
I had a great experience with T3Planet's TYPO3 Extension Customisation Service. They helped me fix my extension. to meet my marketing needs. The final result really reflects my brand, and I appreciate their attention to detail.
#### Antje Scholz
I used the TYPO3 Extension Customisation Service from T3Planet, and I’m very happy with the results! The team listened to my needs and customized the extension perfectly for my business. It looks great and works exactly how I wanted.
#### Lukas Kohl
Working with T3Planet was a great experience! They created a custom extension that fit my needs and helped improve my site’s functionality. Their support throughout the process was excellent.
#### Juliane Eggers
T3Planet made creating a custom TYPO3 extension so simple! They understood my needs and delivered exactly what I was looking for. Loved it!
#### Felix Shuster
I’m not a developer, so I turned to T3Planet for help with customizing my TYPO3 site. Their team made the process so simple, and now my site looks exactly how I needed.
#### Julia Pfeiffer
I had an outdated TYPO3 extension that wasn’t compatible with TYPO3 v12, and T3Planet’s TYPO3 TER support team fixed it in just a few days. Everything works smoothly now, huge time-saver. Thanks T3Planet!
#### Simone Strauss
The developers at T3Planet understood our needs quickly and delivered the custom TYPO3 extension before time. Support was quick to answer any follow-up questions. Choosing this custom service was my best decision!
#### Maximilian Eisenhauer
My website didn't look unique with the default TYPO3 Extension. T3Planet’s TYPO3 Extension Customization service solved that quickly. Now my site matches my brand perfectly and works better than before.
#### Ute Peters
We were facing issues with user registration and content management on our community portal. T3Planet developed a custom TYPO3 extension that solved these challenges perfectly. The team understood our needs and delivered a seamless solution that improved functionality and user experience. It integrated smoothly with our system and boosted site performance.
Technical Expertise
-------------------
| #### PHP | #### TYPO3 is primarily built using PHP, and PHP remains the core language for TYPO3 extension development. Staying up-to-date with the latest PHP versions and best practices is essential for TYPO3 developers. |
|---|---|
| #### TYPO3 APIs | #### Various APIs and services for extension development, including Extbase, Fluid, and REST APIs. |
| #### TYPO3 Extensions | #### Fluid: TYPO3's templating engine, Fluid, is used for rendering dynamic content in TYPO3 extensions. Extbase: TYPO3 Extbase framework simplifies the development of TYPO3 extensions with its MVC (Model-View-Controller) architecture. |
| #### Front-end Development | #### HTML5/CSS3: For building modern and responsive TYPO3 templates. JavaScript: Frameworks like ReactJs, NextJs, NodeJs, AngularJs for enhancing the user interface and interactivity. |
| #### Database | #### Typically using MySQL or MariaDB as the database backend. Staying current with database technologies is important for optimising performance. |
| #### Version Control | #### Using Git for version control in TYPO3 projects, enabling collaborative development and code management. |
| #### Composer | #### Dependency management tool for TYPO3 extensions and PHP libraries. |
| #### Unit Testing | #### Unit testing verifies the correctness of code units, checks reliability and functionality using PHPUnit, Extbase, and TDD. |
| #### Code Lints | #### Maintaining TYPO3 coding standards with tools like PHPCS for clean, consistent code. |
Our Technology Stack
--------------------
#### Domain-Driven Design (DDD)
Focused on aligning software design with the business domain, resulting in more robust TYPO3 solutions.
#### MVC Model
Following the Model-View-Controller architecture for maintainable and organised TYPO3 extensions.
#### TYPO3 Core APIs
TYPO3 Core APIs are essential for flexible extension development, providing essential functionalities.
#### Extbase Framework
Extbase framework in TYPO3 extension development helps developers to follow the Model-View-Controller (MVC) architecture.
#### Fluid Rendering
Fluid, TYPO3's templating engine, is a vital component for rendering dynamic content within TYPO3 extensions. It provides a flexible and efficient way to create templates.
#### TypoScript/TSconfig/Yaml
TypoScript, TSconfig, and Yaml play vital roles for effective configuration and customisation of TYPO3 solutions.
#### Frontend Tech-Stack
We utilize the latest front-end technology stacks, including HTML5, CSS3, Vanilla JavaScript, and TypeScript.
#### Automatic Code Review with Lints:
Ensuring high code quality and adherence to TYPO3 standards.
Related Services
----------------
[ All Services ](https://t3planet.de/en/typo3-support-products)
[### SLA Support Services
TYPO3 SLA = Security update + monitoring site + TYPO3 health reports + Backup & restore.
Starting at €99  ](https://t3planet.de/en/typo3-support-maintenance-sla)
[### System Updates & Upgrades
Budget-friendly & seamless upgrade your TYPO3 website to the latest TYPO3 LTS version.
Starting at €999  ](https://t3planet.de/en/typo3-upgrade-update)
[### Website Design Service
Are you looking for a German-touch website design? Make a modern and elegant TYPO3 site.
Starting at €1999  ](https://t3planet.de/en/typo3-website-design)
[### Tailored Templates
Create your TYPO3 site using modern tech-stack like mask, TS, vanilla JS, fluid & bootstrap.
Starting at €1999  ](https://t3planet.de/en/custom-typo3-template)
[### Online Store Solutions
Integrate TYPO3 shop solution with our official partner, Aimeos - a powerful TYPO3 extension.
Starting at €2499  ](https://t3planet.de/en/typo3-shop-ecommerce)
Related Blog
------------
[ All Blog ](https://t3planet.de/en/blog/)
 25 Sep 2025 [Anna Scholz](https://t3planet.de/blog/authors/anna-scholz/)
Friendly Captcha – The Best CAPTCHA alternative
 24 Jul 2025 [Anna Scholz](https://t3planet.de/blog/authors/anna-scholz/)
20+ Must Have TYPO3 Extensions for Agencies & Website Owners (Part-1)
 12 Jun 2025 [Stefan Reinhardt](https://t3planet.de/blog/authors/stefan-reinhardt/) [Stefan Reinhardt](https://t3planet.de/blog/authors/stefan-reinhardt/)
Make Your TYPO3 Website Accessible to Everyone: A Complete Guide
Frequently Asked Questions
--------------------------
[ More FAQs ](https://t3planet.de/en/faqs)
What is custom TYPO3 extension development?
Custom TYPO3 extension development involves creating personalised extensions or plugins that add specific functionalities to your TYPO3 website, addressing your unique business needs.
Why do I need custom TYPO3 extensions?
Custom TYPO3 extensions are essential when your website requires features and functionalities that are not readily available in standard TYPO3 extensions. They help you achieve a more customised and unique online presence.
How can custom TYPO3 extensions benefit my business?
Custom TYPO3 extensions can enhance your website's functionality, improve user experience, and streamline internal processes. They are designed to align perfectly with your business goals and requirements.
How long does it take to develop a custom TYPO3 extension?
The development timeline depends on the complexity and scope of the project. We will provide you with a detailed project plan and timeline during the initial consultation. It generally varies from a few days to a few weeks.
What is the cost of custom TYPO3 extension development?
The cost varies based on the complexity and features of the extension. We offer competitive pricing and will provide you with a customised quote after understanding your project requirements.
Do you provide ongoing support and maintenance for custom TYPO3 extensions?
Yes, we offer ongoing support and maintenance services to ensure your custom TYPO3 extensions remain up-to-date, secure, and compatible with the latest TYPO3 versions.
Can you upgrade existing TYPO3 extensions to the latest TYPO3 version?
Yes, we can upgrade your existing TYPO3 extensions to ensure they are compatible with the latest TYPO3 releases, providing enhanced security and performance.
Is there a warranty or guarantee for custom TYPO3 extensions?
Yes, we stand by the quality of our work. We offer a **100% money back guarantee** making sure customer satisfaction, your custom TYPO3 extension will function as specified and meet your requirements.
How do I get started with custom TYPO3 extension development?
Simply **contact us** by contact form or give us a call on **+49 6204 6011377** to discuss your project requirements and objectives. We will work closely with you to create a custom solution specifically to your needs. We would be happy to hear!
Do you have any questions?
--------------------------
[Let’s connect now!](https://t3planet.de/en/contact)