The Bloomframe® window is an innovative window that morphs magically into a balcony within 55 seconds. It offers the user a flexible living environment. By opening the window frame, it is possible to walk out through the facade and enjoy outdoor space. The Bloomframe® window can be operated automatically with a single push of a button. The user will add light, air and space, providing him with a genuine outdoor feeling.

The Bloomframe® window is playing an essential role in the positive evolution of our cities.

Michiel Hofman and Barbara Dujardin | Founders of the Bloomframe Company


The Bloomframe® window is no longer a prototype. The revolutionary and multi-award-winning design is in production. The first model is installed in the facade of a new apartment building in Amsterdam in The Netherlands. The product’s creators, the architecture firm HofmanDujardin explain the Bloomframe® window could soon become a familiar element of the modern cityscape as more architects, developers and builders realize its considerable functional and aesthetic benefits.


The Bloomframe® window has outstanding performances on the field of safety, construction, building physics and user friendliness. Portalp France is currently engineering the optimized version of of the Bloomframe® window. The first delivery of the customized model is scheduled for Q4 2021. In the meantime Portalp can collaborate with you on the design and engineering integration of the Bloomframe® window in your project.

The Bloomframe® window is available in the following standard dimensions. Nevertheless the Bloomframe® window can be adjusted to specific project requirements and dimensions. Please contact us to discuss the possibilities for your project.

Dimension L

1700mm (width) x 2400mm (height)

Dimension XL

2300mm (width) x 2400mm (height)

Dimension XXL

3000mm (width) x 2400mm (height)


The Bloomframe® window can be applied in renovations and new constructions on every scale. It is suitable for private homes, apartment buildings, offices and hotels. For specific application in your project please contact the engineering team of Portalp France.


Bloomframe® Amsterdam

The installation of the first Bloomframe® project was in the Amsterdam project designed by HofmanDujardin.

Bloomframe® Paris

Bloomframe® Beijing

Bloomframe® Brisbane Australia

Brisbane’s Hayes Anderson Lynch Architects (HAL) designed the ‘Broadway’ in Woolloongabba project. It is Australia’s first project to incorporate the innovative Bloomframe® window.

Bloomframe® New York

Bloomframe® Scheveningen


During the intense period of engineering the Bloomframe® window has been awarded with several international design awards.

1st prize Wallpaper Design Award ‘Most life enhancing product’

The New York Times selected the Bloomframe balcony for the top 10 best ideas 2008

Nomination Design Award of the Federal Republic of Germany

Winner Janus Award Paris

Winner Red Dot Design Award Germany

Nomination Index Design Award Denmark

Nomination MKB Innovation Top 100 innovative companies in The Netherlands

Nomination Spark Design & Architecture Awards 2009 USA

1st prize Audi Design Award 2008


In which size can the Bloomframe® window be produced?
The Bloomframe® is available in the following dimensions:
1700mm (width) x 2400mm (height)
2300mm (width) x 2400mm (height)
3000mm (width) x 2400mm (height)
The dimension can be customized.

What is the net surface of the balcony?
The net surface of the floor part is 3m² for a Bloomframe® window of a maximum size (3000×2400 mm)

Can you increase the deepness of the balcony until net 1,5m?
The standard depth of the balcony is 1050 mm. It is not possible to increase the deepness.

What is the height of the fence?
Fence dimensions from the surface of the glazed floor of the balcony to the top of the balustrade is around 1218mm. The total height of the balustrade alone is 1222mm

How do you avoid the danger of blocking/trapping?
The Bloomframe® window provides a slow opening of approximated 60 seconds. Both hands of the user are required during the opening and closing process. It is mandatory to wait until the Bloomframe® window is fully open before stepping onto the floor.

In case of rain in an open position how will the water be evacuated?
When closed, the Bloomframe® window has the same properties as a window. The Bloomframe® window position is primarily used in good weather conditions and it is imperative to close it when rain appears. During the closure process, the remaining water on the glass surface will not leak to indoor space. Indeed, the Bloomframe® window threshold is equipped with a small gutter which deflects the runoff towards the drainage holes for the drainage of water outdoor.

How is the control in case of power failure?
The Bloomframe® window works with a tubular motor that is positioned horizontally above the upper crosspiece of the Bloomframe® window (in the inside of the house, behind a protective cover). This motor is controlled by an electronic system especially developed for the Bloomframe® window. It has a manual emergency override system to open or close the Bloomframe® window in case of power failure.

Accessibility for disabled?
The Bloomframe® window electronic control system can be installed at the height specified for disabled (maximum of 1300mm from the floor). As you can see on the attached installation document, an accessibility threshold is provided.

What is the period of protection against fire transfer between apartments?
The Bloomframe® window in closed position provides the same protection than a standard window. If a guaranteed period of protection against fire is needed, it can be studied as an option.

Which regulations are the basis for the constructive performances?
The basis of the constructive performances is Eurocode 8

Is the slippery of the glass floor taken into account? Is the resistance/slippery of the floor according regulations?
The glazing is not considered as a standard floor. Anti-slipping alternatives such as screen printed glazing and adhesives tapes can be provided.

If we make the purchase, which the delivery and installation?
Portalp France produces and installs the Bloomframe® window. Portalp France provides all the necessary information and plans to the installer. The Technical Service of Portalp France would be in direct contact with the installer to provide all required information at any given moment of the process. Depending on the city, we can even recommend certified installers that can help you with your project. As per the delivery, Portalp France can provide this service if it is of your interest, and we can transport the product to your location.


Architects, developers and investors

Bloomframe Professional projects
Mr. Jonathan Bertero
Email contact Contact

Private clients

Bloomframe Private projects
Mr. Bruno Lepiller
Email contact Contact

International partnerships

Bloomframe Partnership Installation and Production
Mr. Jonathan Bertero
Email contact Contact


Bloomframe Public Relations
Mr. Michiel Hofman
Email contact Contact