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Architects: Lendager Group

Location: Nyborg, Denmark

Construction Year: 2013

Floor Area: 129 m2

Photography: Jesper Ray and Polfoto

Client: Realdania Byg

Contractor: Egen Vinding & Datter

Team: Anders Lendager, Christopher Carlsen, Jenny Haraldsdottir, Rune Sode, Morten Bang, Ronnie Markussen

Upcycle House: Increasing Building Performance

Upcycle House is an experimental project, aimed at exposing potential carbon emission reductions through the use of recycled and upcycled building materials. In the case of Upcycle House, the reduction has been 86% compared to a benchmark house.

With increasing building performance in regards to operational energy consumption, focus has now shifted towards CO2 emissions associated with construction. Upcycling is the process of converting waste materials or waste products into new materials or products of higher quality, resulting in a reduction in production and therefore CO2 emissions. When building houses, it is therefore environmentally beneficial to think in terms of material recycling, since the materials have already emitted CO2. It is even better to develop processes where garbage or useless materials can be upcycled and reused for new building materials of higher utility value than they had originally.

Upcycle House

Realdania Byg (a Danish foundation that promotes innovation and best practices in the building sector) has developed and built a single-family house with Lendager Architects called Upcycle House, conveying the principles of upcycling in a tangible and clear example. The house is built of processed recycled materials and Upcycle House investigates how much it is actually possible to reduce the CO2 footprint by using upcycled materials to every extent possible. The load-bearing structure consists of two prefabricated shipping containers, while the roof and façade cladding are made from recycled aluminum soda cans. Façade panels consist of post-consumer recycled granulated paper, which is pressed together and heat-treated. The kitchen floor is clad in tiled champagne cork leftovers, and the bath tiles are made from recycled glass. Walls and floors are covered with OSB panels consisting of wood chips that are the by-products of various production sites, pressed together without glue. The recycled materials are not very visible and the house does not give off a recycled look. The house looks and functions like a contemporary house built from conventional materials.

The initial work on Upcycle House takes place in the workshop where window holes are cut, and the containers are fitted with plumbing and wiring for the bathroom and the kitchen. The containers only serve as the constructive frame of the house. Upon arrival at the site in Nyborg, the containers are placed apart, shaping a central living space, dining space and master bedroom. The two shipping containers are insulated on the outside, making the recycled structural framework invisible. The result is a 129 sq. meter (1390 sq. feet) house that is designed to create the optimal setting for a family’s everyday life. The house features a large living room connected to a spacious kitchen, a master bedroom, three smaller rooms, bathroom, utility room and a passive cooling chamber. In addition to this, the house is also fitted with a large greenhouse adjacent to the kitchen and a large south-facing terrace.

Anders Lendager (owner of Lendager Architects) comments on the results of using recycled materials: “We initially thought that a reduction of 65% CO2 was unrealistic, but when we ran the LCA (Life Cycle Assesment) on all materials throughout the entire project, it turned out that we had reduced the CO2 emissions associated with construction by 86% compared to a benchmark house. With that in mind, we are surprised that no one else is working on this. Why is it not included in everything we do as architects? Why is it not included in the building code that a certain percentage of building materials have to be recycled?”

Passive Sustainability

Aside from the material approach, Upcycle House aims to reduce emissions through an array of sustainable features. Due to the limited economy of the project (1,7 Mil Dkr.), special emphasis has been put on the house’s passive properties. Therefore Upcycle House is designed with orientation, temperature zones, daylight optimization, shading and natural ventilation in mind. This makes for a single-family house with a significant reduction in emissions, which is also well within the economic reach of an average family.

To illustrate the potential of this house, the team did a rough calculation:
The CO2 emissions from Upcycle House are 0,7 KG CO2/M2/YR compared to 5,0 KG CO2/M2/YR for a benchmark house.
In Denmark 10,000 single-family homes are built every year. With a reduction of 4,3 KG CO2/M2/YR and an average floor area well over 130 sq. meter, this makes for a potential reduction of 5590 tons of CO2 per year.


Architects: Lendager Group

Location: Nyborg, Denmark

Construction Year: 2013

Floor Area: 129 m2

Photography: Jesper Ray and Polfoto

urbanNext (June 23, 2024) Upcycle House: Increasing Building Performance. Retrieved from
Upcycle House: Increasing Building Performance.” urbanNext – June 23, 2024,
urbanNext October 18, 2018 Upcycle House: Increasing Building Performance., viewed June 23, 2024,<>
urbanNext – Upcycle House: Increasing Building Performance. [Internet]. [Accessed June 23, 2024]. Available from:
Upcycle House: Increasing Building Performance.” urbanNext – Accessed June 23, 2024.
Upcycle House: Increasing Building Performance.” urbanNext [Online]. Available: [Accessed: June 23, 2024]

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