Frequently Asked Questions

BuildUp Group is the parent company of two innovative brands:

• Retrofitt: Specializing in large-scale energetic renovations.
• beSteel: Experts in sustainable, lightweight steel frame construction.

• Prefabricated elements for energy renovations.
• Lightweight steel frame construction.
• Modular housing solutions.

• Expertise: Innovative solutions backed by years of experience.
• Efficiency: Fast, precise, and cost-saving methods.
• Sustainability: Circular construction and reduced environmental impact.

BuildUp Group officially launched in 2018 with a strong history in light steel framing.

• Headquarters: Aarschot, Belgium.
• Active regions: BENELUX and France.

Our mission is to create a positive impact on global and humanitarian challenges through the built environment by combining off-site production, digitization, and sustainability.


• Architects and Contractors
• Real estate developers
• Builders and distributors
• Onsite decision makers
• Social housing companies,
• Public & private building owners


• Use of 100% recyclable materials (e.g., steel).
• Easy assembly and disassembly, supporting reuse in future projects.
• Reduces on-site activities to minimize noise, dust, and environmental disruption.
• Reduction of on-site waste and emissions.
• Sources materials that are certified for low environmental impact.
• Energy-efficient renovations aligned with EU climate targets.
• Limits transport emissions with local production in Belgium.

beSteel’s network of certified partners includes trusted professionals and companies that meet our strict standards for quality, expertise, and reliability. This network ensures that clients receive the highest level of service throughout their projects.

Discover our partner network page for more information here.


• Respect
• Impact
• Excellence
• Partnership.

Retrofitt specializes in large-scale energetic renovations, turning outdated buildings into energy-efficient homes using prefabricated solutions.

Find our more on Retrofitt website

beSteel is a sustainable steel frame construction company offering lightweight, precise, and fast offsite solutions.

Find out more: https://be-steel.eu/en/

We don’t install ourselves, but since the start of our business (2016) we’ve created Network of Partners who know our product and can install it smoothly.

Depending on the work area, we can recommend one or more installers.

Steel frame needs to be protected with plasterboard.

We have a range of details that can be put at your disposal. We also have a building technician on our team who can help you with your choice of compositions.

Since our profiles are very thin, we have more room for insulation, and the overall performance will be better than that of a conventional structure (for equivalent thickness).

This may come as a surprise, but framing can be very effective from an acoustic point of view. There are reports of above-average performance (class A) that can be shared.

We don’t yet have French technical approval, but our products have European certification (CE), and our studies and processes are in line with this.

For projects in France, our design office will take into account the French standard and DTU32.1.