woningpas heatpump
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Last updated: 28 April 2026

PV panels or a heat pump? We developed an additional advice module for the Woningpas

The Woningpas, a digital platform in the public real estate and housing sector, needed to evolve from a static information repository into a system that provides personalized advice. The challenge was to add automated, tailored recommendations without disrupting the existing architecture. An additional module was developed to extend the platform’s functionality. This resulted in a data-driven solution that delivers customized insights, improving user guidance and the overall value of the platform.

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01

Challenge

Give advice on PV panels and heat pumps, based on different data points. So that owners can make the right decisions for their home.


02

Solution

A module that collects data from different instances, runs a set of calculations and visualizes the result.


03

Approach

A project with a lot of stakeholders and suppliers. So in addition to the technical, we gave extra attention to consultation and demo moments.


04

Result

One point of contact and one overall approach. A module that meets the expectations of all stakeholders. All within budget and timeframe.

veka logo-1

About the Flemish Energy and Climate Agency

The Flemish Energy and Climate Agency (VEKA, Vlaams Energie- & Klimaatagentschap, in Dutch) is a government agency of the Flemish Region under the Flemish Ministry of Environment. It is tasked with the preparation and execution of Flemish energy policy and climate policy.

Challenge

At Europe's request: extra guidance to make the right decision

If you have ever (re)built, then you know that it involves a lot of paperwork: permits, certificates, reports... 

That is why there is a digital passport: the Woningpas. Freely translated: the Housing passport. It collects all that information in one place.

But what if the Woningpas could do more than just centralise data? If we collect all that data, could we use it for something more? To determine which energy investment would pay off best for your building, for instance.

VEKA asked us to tackle this question as part of a European pilot project. We had to make it possible within the existing architecture to give advice on neighbourhood initiatives regarding renewable energy. In a first phase for the integration of heat pumps. In a second phase for solar panels.

Solution

From fragmented data to tailored advice.

Step 1: collecting all the data. Like the data from the EPC, for example, the energy report of a building. There were several data points like this that we had to bring together. That data was scattered among different parties.
Together with VEKA, we mapped all data sources. We then made APIs that retrieve and standardise all that data from the various (government) bodies. Not a straightforward job, as the data is often structured differently. Some energy cooperatives, for instance, still work with manual processes and Excel lists.


Step 2: drawing out and integrating a decision tree


Pieter Swennen, solution engineer at ACA Group: “Using all that data, we made a query that determines whether a heat pump or solar panels are interesting for a house. Is that the case? Then, along with the advice, we also show municipal actions based on the postcode. Such as group purchases or neighbourhood initiatives.” 


Step 3: visualisation. As accessible and clear as possible. So that the effort for the owner to take the next step is as small as possible.


As a result, the user receives: 

 

  • Advice tailored to his or her building.

  • Direct links to local energy cooperatives and relevant projects.

  • Personalised guidance pathways through energy cooperatives.

  • Access to group purchases. 

woningpas

One of the decision trees we defined and integrated. This specific tree determines whether a heat pump is interesting or not, on the basis of the year of construction, among other things. Based on the address, we check whether there is a relevant group purchase available.

Screenshot 2025-07-24 at 10.48.37

The screen that shows if your building is eligible for a neighbourhood initiative.

Approach

Home match with demo moments

Pieter: “This project was a home match for us. About eight years ago, we ourselves developed the digital platform for the Woningpas. Since then, we have kept on developing. With new features, new modules and new integrations... Today, we are still reaping the benefits of the strategic choices we made back then. There is a solid foundation on which we can build further.” 

“As for any project, we started with a pre-analysis, because there are different ways to go about this module. Thanks to such an analysis, we are sure that the functional and the technical are optimally aligned. And that we are making the best possible choices for VEKA.”

Some musts for this project:

  • Being able to add modules quickly without disrupting existing operations. 

  • Use of feature flags allowed us to roll out this module as a pilot. Without impacting the wider user base.

  • Robust foundation for future modulesand European scale-up.

“The Woningpas is a shared initiative. VEKA acts as product owner, but that does not take away from the fact that there are a lot of stakeholders. That is why we organised several demo moments in which energy houses and energy cooperatives could provide their feedback.” 

This allowed us  to further refine the user experience and functionality. “At the same time, it aligns all parties involved. That is why at key moments, we as a developer come to the foreground. Together with VEKA, as one team.”

We have been working together for ten years and the collaboration continues to go well. ACA Group communicates transparently, the quality of their work is high and they deliver quickly. We are a winning team.
Tine Vande Casteele
Project Manager
veka logo-1
1688566018-tinerond
We have been working together for ten years and the collaboration continues to go well. ACA Group communicates transparently, the quality of their work is high and they deliver quickly. We are a winning team.
Tine Vande CasteeleProject Manager
veka logo-1
1688566018-tinerond
Result

All expertise in-house for the Woningpas

For VEKA: a single point of contact and one partner for everything development-related. From briefing to delivery. From strategic choices to implementation. And a partner that works closely with all parties involved: government bodies, cooperatives, design agencies, etc.

Tine Vande Casteele, project manager at VEKA: “ACA Group helped us enormously with a flexible and scalable application. We can later easily incorporate new initiatives. The collaboration was very transparent and efficient, with a strong focus on quality.”

For the cooperatives: a greater reach. Previously, they had to go door-to-door or communicate with the help of different municipalities. Now they can reach a larger audience through a reliable government platform.

woningpas 3


One of the screens of a neighbourhood initiative.

Let's work together

Curious how we can help with your digital platform?

Feel free to contact us and we'll be happy to help!

ACA mok/mug coffee
Let's work together

Curious how we can help with your digital platform?

Feel free to contact us and we'll be happy to help!

ACA mok/mug coffee
Let's work together

Curious how we can help with your digital platform?

Feel free to contact us and we'll be happy to help!

ACA mok/mug coffee
Let's work together

Curious how we can help with your digital platform?

Feel free to contact us and we'll be happy to help!

ACA mok/mug coffee

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