The presence of vegetation has proven to increase peoples well-being and has multiple other benefits. Unfortunately, there is a lack of green in urban areas. Three solutions exist which could reintroduce green in cities and have a low footprint: green roofs, green facades and living wall system. Living wall systems are visible from street level and are more effective than green facades with regard to their benefits. However, living wall systems are not yet largely implemented in the Netherlands. They have a relatively high installation and maintenance costs. Additionally, there is an unused potential of multi-functionality. This report considers the design of a living wall system which integrates a constructed wetland in order to separate, filter and reuse both suitable and valuable wastewater streams exiting a utility building. The design is applied at the WestCord hotel in Delft. The hotel’s water consumption amounts 20,239 L/day, the maximum that could be saved by the water filtering facade. However, the production of drinking water is not yet attainable, due to high investments in continuous monitoring of the effluent demanded by law. The façade will only produce water for toilet flushing and showering, as these two functions provide substantial savings. The fulfil this demand, the façade should therefore have a capacity of 15,715 L/day. Of which 12,101 L/day should come from greywater without food particles and 3,614 L/day of stormwater roof runoff. These sources contain the least organic load. A constructed wetland should consist of distribution, filtration and drainage zone. The most important factors for good constructed wetland design are: high efficiency by a long hydraulic retention time (e.g. by shallow slope, small grain size, low influent velocity, recirculation) and by creating an ideal environment for microorganism development (e.g. by large surface area, the presence of both oxic and anoxic conditions), a large capacity (e.g. by large volume, steep slope, large grain size), prevention of clogging, organic- and hydraulic overload. A constructed wetland is one step of an individual purification system (secondary treatment). The greywater should be pre-treated by a degreaser, the stormwater by a leaf and coarse particle filter. Post treatment for use in shower is desired, this is done by an RO system. The effluent water from the water filtering façade can however be used directly for toilet flushing. To determine the construction for the Living Wall System, research was done into eight existing living wall systems. They were compared for their circularity in order to determine the best system configuration and materials. The water filtering façade will be a panel system as these systems have a large substrate volume related to low materials volume. A list of healthy materials which are recyclable or compostable was composed. Plants species suitable need to be fast growth, but easy maintainable and have a high tissue content. A selection was made of potential plants already applied in both Living Wall Systems and constructed wetlands. Chosen plant species are silene-flos-cuculi, carex pendula, carex elate and carex caryophyllea. Best is to pre-cultivate the system with bare root seedlings. In this case plants should be able to grow at west orientation, the position of the chosen façade at the WestCord Hotel Delft. The main concept of the design is to create a water filtering façade with the least materials as possible, which is easily demountable, prefab and rapidly installed (large modules of 2100x3400mm). The water is intermittently feeded, desiring a low influent velocity for sufficient treatment. The slope was one of the few factors important to constructed wetland design, which could be influenced by the shape of the water filtering façade. In order to lengthen the retention time as much as possible, the shallowest slope is desired which does not cause clogging. From practice a slope of 14.3 degrees proved to perform well. The water flows in a zigzag through the façade in order to cover an as large possible façade surface area.