I find new build installs are a;;ways a disaster in the making and every time it could have been avoided if the ICT team were allowed to speak directly to the contractors.
Amongst the issues I've experienced were:
A computer suite which overheated as the aircon outlet fed into a dummy clock tower. the builders decide to put plywood panels behind the openings to prevent pigeons nesting there making the tower almost airtight and preventing the heat exchanges working.
The system ran for 48 hours before the heat buildup caused the environmental systems to power down the suite.
A new library with public access computers and staff network on every floor where the inter floor ducting was made by embedding 6 inch waste pipes into the concrete floor. this meant that there was no space for the 100+ cables needing routing thorough the floors and we had to go to fibre, not a bad move but a very expensive option at the time and one which wasn't budgeted for,
Finally getting on site to find the comms room was actually in the roof void and had sloping ceilings, we ended up with 6 different comms cabinets each of a different size and all crammed with equipment rather the 6 full height cabinets.
A university where the comns 'cabinets' were actually doorways into a service void which ran the whole height of the building making installing equipment far more perilous than expected.
Finally every single new build I have been involved in leaked. For some reason leaks always end up directly above racks of very expensive IT equipment, nylon sheeting is not part of my supply list for any new build.
We even had an issues where network cables were laid in a hurry as the building was handed over late, cables were pulled thorough quickly, connected up to network points and tested, PC's installed over night and the room handed over the following morning as staff training was starting By 07:30 all the network points failed ad t turned put the cables had been under tension and had 'shrunk' overnight.
Another item in my new build kit is now a 24 port switch and long Ethernet cable as at the network always seems to fail in at least one room when live use starts.