Building regulations drawings are more detailed than planning drawings due to the level of information required to explain how things are constructed. This can make them more difficult to understand if you are not used to reading drawings. A good set of building regulation plans should have a high level of detail & include detailed construction notes to explain the proposed construction methods of your project. This extra detail can make it easier to price a job more accurately so more accurate estimates can be obtained from a good set of building regs plans.