Simple Permitted Development Rear Drawings + LDC Submission (UK)

Looking for someone experienced with UK permitted development drawings and Lawful Development Certificate (LDC) submissions.

Project:

Single-storey rear extension
Property in Greenford, London (UB6)
3.0m depth
Approx. 2.8m flat roof with lantern
Open plan layout
Existing rear opening retained (no structural alterations)
Built up to boundary

Required:

Existing & proposed floor plans
Rear and side elevations
Site/block plan
Drawings suitable for LDC submission
“Basic structural details for Building Control.”

This is a straightforward permitted development project with no design complexity.

Please confirm:

Experience with UK planning/LDC drawings
Turnaround time
Fixed price


Thanks