One of my recent projects was about designing a small ground floor extension. My client has asked me to prepare all the required documents to apply to the City Council for permission.
For such application, council's requirements are pretty high (in my opinion too high), we had to provide full existing building documentation: Ground Floor Plan, First Floor Plan, Attic Floor Plan (even is the extension was only on the ground floor), Roof plans, Plan of the whole property, elevations, plus all documents showing proposed extension - so again, ground floor, elevations, sections, details, etc.
All drawings I have done by myself based on my own survey (running around the house and measuring everything possible :)
Please find several drawings I have prepared for my client on that occasion.