CHALLENGE #8290122




Bathroom in a Day Challenge



Mitros renovates over 1,000 bathrooms each year. We believe the renovation process will be quite different in the near future. The existing process costs approximately 5 million euros, can take up to 7 days to complete and is very disruptive to tenants: construction noise, construction debris, dust and lack of access to a working bathroom. But the bathroom is only a part of the issue. In the next decade Mitros will renovate over 6,000 homes at an average cost of € 55,000 per house.


In this challenge we are looking for affordable approaches and innovations that make it possible for a bathroom to be renovated quickly, with minimal disruption, and preferably 'one at a time’. With a better solution, no longer will every house in the neighborhood have its bathroom renovated at the same time, but rather when it suits the tenant. In this way more people will get a better bathroom with less inconvenience. And that's where it started for Mitros; making tenants happy with their home and their social housing company.









Mitros, a Dutch social housing corporation based in the city of Utrecht, invites proposals for innovative approaches that can substantially accelerate the renovation process of bathrooms in social apartments and houses. Ultimately, the ideal solution will speed-up the renovation process of the bathroom from seven days to only one day, greatly reducing the amount of nuisance to the residents.  For a full explanation of the challenge, please view the Challenge Summary Document.



The total opportunity for this Challenge is up to € 80,000 in cash plus possible collaboration contracts. Up to 4 respondents will be awarded initial recognition up to € 10,000 each.  The 2 most promising proposals will be invited to demonstrate their solution and will receive an additional recognition of € 20,000 each, which covers all work costs.  If successful, further collaboration may be available, i.e. piloting at a larger scale.








The proposed solution should meet at least one or more of the following criteria:


  1. Accelerate the bathroom renovation process
  • Significant reduction in the duration of the renovation, preferably to 1 day only
  • No or limited affect the functionality of the bathroom, e.g. its size, partical interior design
  • Partial solutions are also of interest


  1.  Lower the amount of hindrances
  • Significant reduction in the amount of dust caused by drilling/stripping/notching, preferably dustless
  • Significant reduction in the amount of noise caused by drilling/stripping/notching, preferably noiseless
  • The technology should be usable in rooms which can be as small as 3m²


  1. Costs should be comparable or lower (after development) than a traditional bathroom renovation (average of €5,000 each bathroom). The total cost of ownership must at least be equal, preferably improved, due to cost avoidance, time reduction, even if that implies an increase in for example materials cost.


  1. Enable some customization to each resident’s taste and give residents flexibility in the timing of their bathroom renovation (series-of-1) 


  1. Solve the soil & waste stacks challenge (see Challenge Summary - Appendix for further details) 
  • As less radical as possible, preferably without drilling/grinding


Note: In general, all solutions should be maintenance free for 20 years and easy replaceable due to the recurring process of renovating the bathrooms.


The ideal solution would address all objectives (a, b, c, d and e) leading to more satisfied residents.


Mitros is also interested in suggestions and ideas that might help in providing a partial solution. Partial solutions do not have to meet all criteria and may require further development, for example a solution that is suitable only for the soil & waste stacks will be interesting and thoroughly evaluated.


Proposals will provide supporting evidence that it can meet these criteria.



Mitros is a Dutch social housing corporation owning 29,000 rental apartments and houses in the cities of Utrecht and Nieuwegein. Recently Mitros started an innovative project called “Expeditie Doorbraak” (“Expedition Breakthrough”). The aim of this project is to minimize the inconveniences that occur during the traditional renovation process. A major challenge of renovating apartments is the renovation of bathrooms. In general these bathrooms vary in size and can be as small as 3m² with a basic set-up (shower, toilet, sink).


The four main challenges that the Challenge wants to solve are:


  • Accelerate the bathroom renovation process, preferably down to a single day
  • Lower the amount of hindrances, i.e. dust, noise, out-of-order time, which occur during renovations.
  • Lower the renovation costs
  • Solve the technical challenges associated with the renovation of the soil & waste stacks.


Solving these challenges will enable the renovation of individual bathrooms, whereas now the renovations are performed for entire building blocks. 



See Terms and Conditions for details. Challenge opens on September 29, 2016.  Must submit at least one entry by December 1, 2016 at 5pm EST to be eligible.  Must be 18 years of age or older to participate.  No purchase necessary.  Void where prohibited.


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Tom Vranken



Tom Vranken
Program Manager


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Gerdi Berkers

Gerdi Berkers
Project Coordinator

Menso Oosting

Menso Oosting

Project Manager