SK Office

Slangen + Koenis Architects (S+K) is an architecture firm that consists of a permanent team of 30 employees, this team contains a healthy mix of experience and young design talent. The company was founded in 1985 and has over 35 years of experience.

Chemistry and innovation

Our special attention goes towards a certain chemistry in the relation with our client. The aspiration is to establish a high degree of trust, in which the client feels free and confident to leave it in the hands of the architect, after which the architect will fully live up to the expectations. It is our strong belief that every good project needs a good and above all involved client, as an architect you can influence this directly. Every project provides, within a certain framework, the opportunity to create architecture as long as your focus as a company is aimed on this aspect. If you are always willing, as a team to familiarize yourself with the required knowledge at the beginning of a process, you can open-mindedly take this challenge head on. It is our vision that this mentality will result in innovative and unique results in each project.


Our goal is to work with enthusiastic clients and users every day. We want to make extraordinary projects for a realistic budget and we want to add something special, something ours, to every single project. The well-balanced process to create a good building in harmony is for us just as important as the building itself.


Through the years S+K has become a specialist in the field of public facilities, swimming pools and sports accommodations in particular. Over time the company has gained detailed knowledge and experience in our field, especially regarding swimming pools, sports centres, fitness centres and leisure- and cultural centres, often as a clustered concept. Our client base consist mostly of municipalities and educational institutions. We are specialised in integrated design and are often commissioned on this basis. In addition to the architectural design we are often also responsible for the structural design, technical installations and acoustics and fire safety. This gives the client the advantage having a single point of contact. The most projects are so called complete assignments and include all stages, from concept design to realisation.

S+K performs all tasks with our own team. 3D-images and models are produced in house and our own project managers are be devoted to the overall coordination and building supervision. We produce all the presentation material that will be provided to the client and we can implement these visualisation methods on behalf of every design process.

Dimension of projects

Our reference projects give a clear image about the differing scales of projects that S+K commonly has in its portfolio. In addition to large scale developments we are also involved in a number medium sized and smaller projects, including renovations and expansions. These projects are often just as challenging and inspiring as the bigger projects, both in design and process.


It is our vision is that the most sustainable building is one in which the “inhabitants” feel great and which adds value to its location. We think that this can be created if the building is:

  • welcoming and brings people together
  • flexible and has the ability to transform based on the needs of each user;
  • responsible in its energy and water consumption;
  • materialised using honest materials;
  • ages in a charming manner;
  • comfortable in its use;
  • feels as THEIR building!

It is our greatest ambition to realise this for each of our designs. We all strive for an overall concept in which all these elements reinforce each other. Our love for sustainable materials, smart installation concept and our constant drive to innovate our the force behind this quest. Sustainability in both concept and realization is embedded in the genes of our team!

Designing and building with a strong focus on the entire life cycle of a building forces you to make long term decisions. If all parties involved share this vision the entire process of design and realisation becomes more harmonious. Placing the greater good above individual interests and listening to each other’s point of view can lead to surprising decisions.

Building volume, orientation and building systematics form, in our vision, a strong basis for a sustainable and operations orientated design. By looking for a optimized volume we can reduce the energy use more than with the use of special technologies. This volume also form the basis for a low maintenance building. The right orientation optimizes the use of daylight in keeps out the warmth of sun. Introducing a logistical system with a clear routing and clear sight lines makes a sports accommodation save and easy to operate. A high level of transparency reduces the risk of vandalism and maintenance. Building that are easy to clean are maintained with greater pleasure and age better. We always aim to choose the most sustainable materials. The use of wood, steel and concrete ensure a low environmental impact and the possibility to recycle.

A smart building system minimizes the building time and thus saves money. Using a smart building system, maximising the use of prefab elements, also facilitates a sustainable and high quality materialization without unnecessary layers; we make more with less! In addition the building needs to have great atmosphere to dwell and exercise. Acoustics, air quality day light and interior materials play an essential role in creating this atmosphere.

Slangen + Koenis Architects (S+K) is an architecture company that consists of a permanent team of about 30 employees:

Jakko Koenis
Erik Slangen
Sander Laheij
René van Zoeren
Dean Moran
Peter Baas
Robin Gringhuis
Marthe Hoens
Robbert Muskens
Sylvie van Beek-Dorn
Martijn Elverding
Joana Coutinho
Derrin van de Wetering
Rytis Budavicius
Alessandro Spera
Lilian Baumgärtel
Kamelia Marinkyova
Business Developer
Ninja Freeling
BIM engineer
Robert de Boer
Michel Stienstra
Dick Valkenburg
Douwe Hummelink
Brian Binkhuysen
Remy Dencher
Thijs van Ekelenburg
Max van Ree
Kevin Appelman
Jesse Klomp
Tom Waalders
Project Manager
Bart Solinger
Sjef Vosters
Iris Koning

Slangen+Koenis has valuable and innovative relations with the following parties: