Do loft steels require planning permission?

Yes Building regulations approval is required to convert a loft or attic into a liveable space. This section provides guidance for making alterations to the loft space of an existing house which is no more than two storeys high.

Do Loft steels require Planning Permission -YES
Loft not require Planning Permission as long as your plans fall within the below rules, you can build your loft conversion without planning permission,

You use the same type of building materials as used throughout your home
Your loft conversion has windows that are more than 1.7 metres above floor level
Your additional roof space is less than 50 cubic metres
Your new roof pitch is the same as it previously was
Your home wasn’t previously a non-residential building
Your loft conversion doesn’t include a window on the side elevation of your home
You haven’t already added extra storeys to your home
Your home doesn’t contain flats Any side windows are frosted
If you plan to add a dormer window, it needs to be set at least 20cm from the current wall

Yes

No you have to get the neighbour permission and you need to secure the chimney stack with wall plates

No shouldn’t need planning as it’s an alteration! Only have someone with experience in structural side of building any competent builder could do this!

Yes

When the work is associated with they neighbours stack/wall - Then a party wall surveyor needs to be involved. This also needs engineering drawings and calculations submitted to Building Control - Pad stone design/dimensions and fire prevention intumecent paint. The works will also require a temporary works design to ensure all structural elements are supported

Building control will visit once the steels/galley brackets are installed to inspect to ensure that the correct methodologies and standards of work applies - and that the correct steels and pad stones were installed.

An inspection also needs to be carried out on the neighbours side for settlement cracks and will making good will need to be carried out as a duty of care and contractor responsibility.

Hello
First of all, I'm totally amazed that this wasn't picked up in your house buyers survey?
Both your solicitor & surveyor should have picked up on this? Usually the seller/vendor has to legally provide information about any structural works/alterations carried out about the property.
I would suggest you ring your local trusted builder for advice & inspection.
I hope this helps.

No not unless it is a listed building

Yes

you would need a party agreements from your neighbours
Usually this will need a steel beam In some circumstances a system of ( gallows brackets ) may be agreeable to the building inspectors but you must check with your local building control office first before any action

Most loft conversions are considered permitted development, which means you won't need to get planning permisson as long as the building work fits certain criteria. So, if you're looking to get a simple conversion with roof windows, you generally don't need to worry (but it's best to check).