Home TT Earthing Design Consultation

My new house is almost ready and I now need a complete earthing design before any circuits go live. I have already decided on a TT system, so the assignment is strictly design-and-planning: no on-site installation work, just a clear, code-compliant plan that my electrician can follow.

Here is what I can supply right away: the full floor plan with the exact size of the property, uploaded the ground floor plan image. If you need additional data like, nearby structures, future extensions,let me know and I will gather it.

What I expect back from you:
• A schematic showing earth electrode layout, conductor sizing, and connection points
• Calculations that justify electrode quantity, spacing, and conductor cross-sections
• A concise materials list so I can price everything locally
• Brief installation notes and testing values that my electrician should aim for

I am in no rush, but I do want the design to adhere to the relevant national wiring regulations and any best-practice references you normally follow. Please outline your approach, the standards you design to, and an estimated turnaround time when you respond.