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formal notice of the planned works
As in a party wall notice I assume ? This is the process that kicks of the party wall biz. ie. You reject and then either share a surveyor or appoint your own at their cost.
"Rights to light" are a separate civil matter and you could go down this route - getting a survey / assessment etc. if you do have grounds you can submit a Light Obstruction Notice . It might all end up in court.
Back to PD - there is this I guess .. does not comply if ....
(b) as a result of the works, the total area of ground covered by buildings within the curtilage of the dwellinghouse (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse)
if it was in contravention then the council really should have picked that up on the lawful dev submission - But you never know.
I'm not sure a plan will help much, but here's a rough one to show how things stand. The original drawings had the boundary line (and new party wall) as being across the actual boundary line by some margin – I now wonder if that was intentional, given the '150mm' comment. So that means they're allowed to build into our garden, reducing its already meagre square footage?
These are old two-up-two-down terraces, btw, to give an idea of house and garden widths.
We already have a single-storey extension that extends into our garden – and, in fact, so do the neighbours – it's currently a mirror image of ours. They're just rebuilding it (still single storey) to go right up to the boundary line, which we think will reduce the amount of light coming into our back room (it opens onto the garden via patio doors). I don't think there's any getting around that, so it's really just the impact on us of the foundation digging that's a concern.
Their surveyor won't deal with us at all – leaving us no option but to appoint our own at their expense, it seems.
A party wall award hasn't been issued yet. Neither a surveyor nor a planning officer has visited the site yet, so all we have so far is a formal notice of the planned works, asking us to consent or reject within 14 days.