@tommyk said:
I do extensions and renovations using Sketchup and LayOut exclusively.
I make the following models:
survey model (of existing) - simply modelled. design model - for finishes, furniture layout, and discussions with client construction model - for technical putting together of buildingsI have in the past tried to put all those models into one, using layers for demolished walls, etc, but it soon got tedious, and I work in the above way now. Keeping models separate also has the advantage of keeping model sizes down and therefore your modelling speed up.
I don't use another 2D CAD program at all. I do my sketch plans on tracing paper, then go straight to Sketchup to get my accurate drawings.
That's like the way I've outlined below. I do sometime split the model into different parts but I'm always afraid of not keeping the main information centalised as I can get mixed up between version changes. I might take particular sections of the build and show them separately but the central model is paramount.