DevilDamo

It sounds like the OP is referring to a ground/geotechnical investigation of which a structural engineer cannot do.

It is more relatable to new build/converted dwellings. They will stress the approval relates to the required space standards.

If you seek Planning for a 1-bed dwelling, it’ll never be sold as a 2-bed even if you split the internals later.

Providing it is designed and meets the Local Planning Authority’s policies, then it will be approved.

You can download a free trial from Autodesk for 15 days. Alternatively, SketchUp should do what you need.

https://www.nhbc.co.uk/binaries/content/assets/nhbc/tech-guidance/glazing-guarding-and-restrictors-in-dwellings.pdf

Rights of access over this road may be more of an issue. Who owns the road?

Since when?

You cannot compare pre-app with outline/full application fees as the latter will end requiring a lot more information.

Do all upper floor habitable rooms have an external window or door that meets the escape window requirements?

You would have carried out unauthorised works. What the LPA would do is down to them.

Just because others may not have secured Planning, doesn’t mean they were exempt from doing so. Planning could be refused on highway safety grounds.

What about the rest of the Approved Documents?

1. You would need to submit a Variation of Condition application and explain what is being varied and why. 2. That specific condition is just a statement. Prior to commencement/demolition/development are usually conditions that require information to be submitted for approval.