Traditional Lime and Sand renders are an excellent choice for replacement or aesthetic considerations on a suitable background. However, as they are not coloured and if you wish a colour even though advances have been made in the production of Lime Wash. Please be aware that you will probably have my childhood job of Lime Washing the Render every summer! I think I was possibly the only kid around hoping it would rain for at least part of the summer holidays!
Renders such as Thermocromex backed with the correct base materials over appropriate host stone and building materials are an excellent choice for maintenance free renders. In general the backing coat and top coat give a depth of 18-20mm, considerably greater than the industry standard of 10mm. Again as with Lime Pointing and Stone Repair the key is a combination of preparation, process, environment and finishing technique.