Integrated roller shutter window systems for the modular and jackleg industry. The window comprises of an inner lining and a steel roller shutter, internal pulley cord to raise and lower and are fully compliant to UK building regulations. The ISS window also has eco/green qualities, com link green line profile, one of the most eco friendly uPVC frames on the market. The windows are easy to maintain, energy efficient and reduce solar gain. The windows are aesthetically pleasing and will enhance any simple jackleg or modular building. Compared to alternatives, the savings that can be achieved are considerable.