Is this cavity insulation enough?

[ajrobb]

you can look at the drawings.

Hark! Is that the first cuckoo of spring?

 

[stuart45]

Does building control make visits to new houses at specified build stages or do they just do it ad hoc if they feel like an inspection?

On large sites the houses are normally covered by NHBC and in theory there is someone capable employed for quality control, so you won't see a BCO on site. They hav'nt got the time to inspect all the new builds.
There are trade offs allowed on the U values of the building elements now, so as long as the SAP rating meets it's target it's OK.

 

[ajrobb]

There are trade-offs allowed on the U values of the building elements now, so as long as the SAP rating meets its target it's OK.

Like a new house in our street. It has a great big, draughty, single-glazed glass front offset by solar heating panels. Great for staring up nighties as they come down stairs...

Sorry, I mean it is very stylish.