renovate house

I wonder if you could inform me on how long it takes to renovate a home. We have a three bedroom semi (two double beds and a box rm), we want to hack off and re-plaster the walls in the house, new boiler in, build a small porch to the front, uPVC double glazed windows and doors put in, new boiler, hack off and pebble dash the exterior of the house and a new roof on our 1980s extension and also re-do the gables of the house. How long do you recken this will take, we will be living in a caravan in the back garden while this work is being done, the house is 1940s in the uk.

Repossession