• 31m2 x £1500 p/m2 = £46,500
    Architect £5.8k
    (depends on the architect - this is 12.5% of construction - not unreasonable for a full service and amount of work involved on an existing building IMO)
    10% Contingency £4.65k
    SE 1.5k
    Party wall 1.5
    B regs 1 k
    £61,950 + VAT £12,190
    =£ 74,140

    £1500 is a fairly modest £/m2 rate i think but i'm no QS.

    Here's another calculator:
    https://architectureforlondon.com/news/loft-conversion-costs-london/

  • Like that Rusted one I posted and
    you found out about it , does seem mad that people are spending that much on an extension on Warner flats doesn’t it?

    Do love a Warner flat but 80k on flat in e17 plus cost price is house nearby money.

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