E Z Design and Construction Ltd is a specialist in designing and engineering sustainable buildings. We can perform various software, analysis tools and techniques to analyse the performance of the building at early, conceptual design stage. We can design building to Passive House Standards. We are based in Swanley, Kent. We cover South East London and North Kent. We are a sustainable building design company. Some of the services we offer are: Energy balancing calculations. Daylight Analysis. Sun Path Diagrams and Analysis. Shading Analysis. Environment and Site Analysis. Solar Analysis. Passive House Planning Package (PHPP) Calculations. Passive House (Passivhaus) Design.