Building responsibilities

[FantaIsFine]

Hi

I am post tastic this morning but they all spring from same issue only are separate. To do with a ground floor extension.

I love my builders DEARLY but ahead of a conversation about some plumbing options could I ask with whom (if anyone) the responsibility lies to establish status and impact on some things? Of course contract states some things that I need to pay for which I get, but the actual scoping of requirements to avoid surprises?
If it's me then I'm just unaware so my bad and obviously for me to just suck up

Location of incoming house water supply and considerations around piping positing and moving it (along with water meter)
Adequacy of boiler to support under floor heating
Requirement of any new pumps needed for power shower installation
Incoming water pressure for supporting all or any new plumbing

So a boiler for under floor heating if a requirement should totally be my spend, I don't debate that. But if it hasn't been identified at the beginning as an absolute requirement in order to consider if I WANT to spend it vs not having the heating, is it my responsibility to have engaged a plumber to audit all these elements beforehand?

There's a chain of impact from each of these to the next and a big differential in £ not to mention a number of £ already spent where given various knock ons I may or may not have chosen to spend. I'd just like to understand if it's my responsibility as DD or if I should expect to have these things raised before I'm committed - or if I should have known to ask all these questions.

Thank you 😊

Those are all ultimately your responsibility. A nice builder might help you out with contacts, and a builder who operates a medium or large operation might actually sub the work to someone else on your behalf, but it is still ultimately your responsibility. Especially things like utilities connections.

optional spends are at your discretion (I assume when you say go without heating you mean conventional rads rather than underfloor; not installing heating would be madness). It’s up to you what you spend additional on, but most extensions would be for building and finishing but not necessarily utilities. What does the quote say?

Or has someone installed underfloor and you don’t have a boiler/pump?

Thanks @ducking, well I'm being a bit preemptive here about the under floor (yy rads instead as the option not no heating at all)

A lot of work like digging down has already happened so I am worst case planning/thinking in case boiler turns out to be a surprise spend and hasn't been raised so far.

And if it DOES need a new boiler then there are other choices I would have made elsewhere (not just under floor vs rads).

Also connected with unanticipated spend on power shower pump which new boiler could negate the need for apparently

Utilities I hear you - but where my own pipes actually are already and needs/practicalities around moving them?

Thank you thank you

You should be dealing with a plumber not a builder.

Good point apologies that was unclear - building project team including sub contractors

So I was using shorthand but perhaps that is important