Old Buildings are hard to draw

I’ve recently done some CAD work for my Father-in-Law who runs Mayflower Homes. The work was the drawing up of both some existing and proposed plans of a large house in London which he intends to buy, renovate and re-sell.
Old buildings are quite hard to draw accurately for a number of reasons.
- they’re not made out of nice regular bricks; but rather stone of various sizes; therefore walls tend to vary in thickness rather randomly.
- walls are thicker and so door and window openings are much more complex
- old buildings have usually undergone various DIY projects which means rooms, layout and spaces are complex. You can see form the image above how the different shaped rooms struggle to fit together.
But probably the most annoying thing when it comes to drawing up old and altered buildings is this: there are far too many doors. Looka t the number of doors in those plans. TOO MANY!!
