This project analyzes Nordic trends in the development and industrial uptake of green nanotechno-logy in construction. The project applies an evolutionary economic perspective in analyzing the innovation dynamics and firm strategies in the window value chains in three Nordic countries, Denmark, Finland and Sweden. Hence the project investigates two pervasive parallel market trends: The emergence of the green market and the emergence of nanotechnology. The analysis investigates how a traditional economic sector such as the construction sector reacts to such major trends. Conclusions are multiple, but among the most important are: Eco-innovation has become the perhaps most important driver for innovation in the construction sector. Search into eco-innovative business opportunities is intense among all companies along the three analyzed Nordic window chains. While we generally find a low uptake of nanotechnology in the construction sector in the Nordic countries we do find quite a high number of nanotech applications in the Nordic window chains. Eco-innovation is influencing strongly on the nanotech development. We see several examples of nano-enabled smart, multifunctional green solutions in the Nordic window chains already or about to having a commercial impact. Currently, it seems the greening of markets is beginning to affect the roles different companies play in the chain. We see a marked shift towards more sys-temic, smart eco-innovative solutions which fit well with nanotech opportunities. Overall, the recent greening of the market seems to be opening a window of opportunity for nanotechnology in the Nordic countries but the widespread discreet firm strategizing towards nanotechnology may reduce the exploitation of these.