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Here you go: https://costmodelling.com/building-costs
So many variables - material choices, site access, roof shape, height, how it joins the existing, services etc etc, but it definitely won’t be £100k (£7000/sqm) and it’s quite unlikely to be £30k (£2000/sqm) these days unless there are lots of things on your side (experience, knowledge, contacts mainly). £50k ought to be more than enough unless it’s super complicated.
Hefty
Grumpy_Git
How much info to provide? i don't want exact costings but knowing if I could get the basic structure in and signed off for 30-50-100k?
It's about 3.8x3.6m, foundations are expected to be suitable already.
Ideally steels and timber not brick construction.
would expand the box room and need to tie into the main pitched tiled roof,
2 windows,
No urgency to do the CH or electrics if it keeps the costs down initially as it will open out the existing box room where services can remain.
Any indicative costing you could provide would be really appreciated.