There are different plastering solutions available to you. The one you use depends on a few things...
These days Gypsum finish plaster is the defacto standard plaster for use on the majority of modern buildings, and is the plaster solution we are most often asked to provide. It can be applied to a wide range of backgrounds. It provides a smooth, inert, high quality surface to internal walls and ceilings, and a durable base for the application of decorative finishes.
Lime plaster has been used for hundreds of years on buildings all over the world. Lime plaster is an excellent natural material, and is both flexible and breathable.
Traditional lime plastering should always be used on older properties, and the use of gypsum plasters should be avoided. These buildings were originally constructed using lime, and it is vastly preferable that lime plaster is used when repairing or refurbishing.
Using modern gypsum plasters on older properties will give rise to many problems, amongst which are damp, cracking, efflourescence and mould.
Monocouche is a modern, pre-coloured render often used for speed and cost effectiveness (it's fast to apply and doesn't need painting). However, being a bit of a traditionalist, we don't offer this service. I don't believe it lives up to the promises made or is particularly good for a lot of buildings.