All teams & projects

SUM ● Delft, Netherlands

● Projectvideo

Teamphoto of SUM

● Team SUM © SUM | SDE 21/22

Logo of team sum.
University ● Delft University of Technology
Task ● Renovation & addition of storey, bouwlust, the hague

About the team

SUM consists of 63 enthusiastic students with 24 different nationalities from 10 different disciplines within Delft University of Technology (TU Delft). The plethora of unique experiences and diverse background each student brings to the table allows the team to view projects from a holistic perspective. SUM aims to grow as an international and interdisciplinary team that utilizes horizontal team management, cooperation and communication.

Our motivation

SUM aims to craft resource-responsible and resilient neighborhoods. There are 847,000 tenement flats in the Netherlands, which represent 11% of the housing stock. By addressing this type of housing, SUM has the opportunity to create a system that can be used across the Netherlands and even Europe, making the world more sustainable and symbiotic with each home changed. Tackling this type of buildings creates the opportunity to contribute to Dutch nationwide goals of being energy-neutral in 2050 and adding one million homes by 2030.

SUM also looks for solutions that contribute to the urban and social living environment. According to SUM, creating a community based on new and sustainable habits is an opportunity to create a major impact on our social life and environmental footprint. Through this, a strong and resilient community is created, which is the basis for a better life.

Our motivation

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● © SUM | SDE 21/22

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● © SUM | SDE 21/22

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● © SUM | SDE 21/22

Project description

Our project is situated in De Dreef, in The Hague. De Dreef is a modernist neighbourhood, which is built up by a repeating stamp consisting of three tenement flats, built in 1956. At the moment, the flats are at the end of their building lifespans; they do not meet the needs of the residents anymore and the energy performance of these buildings are low.

The three main objectives to tackle the current problems are:

  1.  To create a net-positive solution for the redevelopment of post-war neighborhoods.
  2. To use the redevelopment as an opportunity to create symbiotic solutions.
  3. To provide affordable accommodation for the push-pull generation (20 to 35 years old).

SUM also strives to develop solutions that contribute to the urban and social living environment. We aim to tackle all these challenges by developing a strategy that is two-fold: renovating the existing building and adding apartments via a top-up addition.

The proposed lightweight top-up will be placed on the existing building, densifying the neighborhood and functioning as the energy hub for the entire building. The prefabricated timber modules that make up the two layers of the Top-Up, can be connected together to create different housing types. The modules are also able to function as an independent unit, conforming to every situation.

The top-up will also have PVT panels on the roof and a building integrated solar facade, to produce hot water and electricity for the entire building. The roof will also provide space and ideal conditions for plants and animals. This way, the top-up acts as a link to create symbiosis between users, the building and nature. For the renovation, the main goals are to improve the energy performance and to adapt the floor plans to a more modern way of living. In order to improve the energy performance, the existing windows will be replaced and the building will be wrapped with a layer of insulation. With the introduction of a circulation core and a gallery, all the apartments will be accessible by elevator. The transformation of the current stair cores and the inclusion of the existing balconies as interior space creates new rooms for the apartments.

To improve interaction with the public, SUM is proposing to incorporate new public functions on the ground floor, replacing some of the existing residential units. They will interact with the neighbourhood and house different aspects of the sharing economy that is proposed in our design. This would stimulate entrepreneurship and a micro-community specific to the neighbourhood’s unique identity. Furthermore, we focus on the gradual transformation of roads heavily used by cars into shared space, creating a transition towards a car-free neighborhood.

● Get to know the team

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● © SUM | SDE 21/22

The texts were written by the teams themselves and will be updated during the competition.


Danny Westerink, Communications Coordinator
Phone: +31 642725475



Facebook: @team.sum.tudelft

Instagram: @team.sum

LinkedIn: @team-sum


Press kit

SUM ● Delft, Netherlands