We have run into a sticking point with our builder.
They installed a very large (and expensive) double glazed unit which is the incorrect size that we stipulated. If we wish to change it I suspect they will try to make us pay for an entirely new unit and charge us the cost of removing the old one and replacing it.
We traced the error to a outdated specification that we provided them. They allege they never received the revised update. I nevertheless have a copy of this on email.
We signed the contract, plans and elevations. They did not provide a final window schedule to sign.
The elevations and plans did not represent the window in question accurately but in the margin of the plans is a statement that the diagrams are not to scale and the figured dimensions should be referred to.
We assumed they had received the revised instructions for the window schedule. We in fact received an email in reply that they were being (apparently) costed.
When the error was detected, we requested a copy of the window schedule (unsigned). It then became clear they had incorrect details.
What is the legal situation here? Do my emailed instructions have any legal weight? Do the (unscaled) elevation and plans have any legal weight? Does the window schedule (with figured dimensions but no signatures) be considered a validly legal document? Can it be argued they proceeded to order and install windows that we never consented to?