Lean to conservatory - extension issues

Hi

So we have a ground floor Victorian flat. We would like to extend out into the side return but a proper extension is too expensive, so we're thinking a Lean to conservatory. We'd like to knock the walls down so to make one big open lounge/kitchen/diner.

Issues are:
- the whole of the back of the house has been underpinned on piled foundations due to subsidence about 5years ago.
- theres a thames water shared drain is in the way towards the potential extenion area (just by the main garden). which we need to divert or build around?
- we'd leave a very small lightwell in the middle to allow bedroom window to stay and saves rerouting some drains.
- theres an existing steel rsj across the lounge, which means we either need to leave a pillar in the middle of the wall on the side, or get a new steele rsj!
- We would need a new steele post that can run ovedr the existing piles on the corners of the lounge. Hope that makes sense!?

See pic!
Any thoughts greatly appreciated!

 

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