Installers will only need access to the outside of your property – they shouldn’t need to come inside.
Scaffolding will be required. If you have a garden, items like furniture will need to be moved out of the way.
The time it takes can vary significantly. Private installs may be as quick as two weeks. Installs through a funded project will likely take considerably longer.
The weather and temperature can also affect the time the install takes.
Depending on the type of render you choose, there may be extra disruption. If stone chips are used, these will end up on the ground/in the garden during the rendering stage (when the final layer is added to the wall).
The installer should clean these up at the end of the install. They should also take measures to protect your doors and windows during the rendering stage.