List of confirmed plot sizes taken from various threads on these forums.
Grid house 1x1
Guard House 1x1
Sat. Uplink 1x1
Cafe 2x2 (no facing dot, defaults to facing S at placement)
OT Mining Ops 2x2
Notum Silo 3x3
OT Small HQ 3x3
Pool: 3 x 4
Landing Pad: 2 x 2
Cloak/ECM: 3 x 3
Sky Bar: 1 x 2
Small Clan Headquarters : 3x3
Clan ECM Tower: 3x3
Clan Grid House: 1
Clan Satellite Uplink: 1
Clan Notum Mining Facility: 2x2
Clan Sky Bar: 1x2
Clan Cafe: 2x2
Clan Landing Pad: 2x2
Clan Guard House: 1
Clan Notum Silo confirmed 3x3
Clan Swimming Pool confirmed 4x3
Added latest updates.
medium hq is 4x4
It is in a L shape with door in the L angle, but takes 2x2 squares still. Beta information, shouldn't change...
Can someone tell us for sure the footprint size on a large HQ?
we know Small HQ is 3x3, werepyr has told us the Medium HQ is 4x4...
If you look at HH's Large HQ, just west of Galway Castle, and pace off the sidewalk squares, it appears to be only a 4x4 also.
I can confirm that a larg HQ is 4x4
Omni Tek Small ECM is 2x2 large squares (10x10 small)
Clan Large HQ is 4x4.
I noticed all Clan buildings were faced north as default.
And when rotating it goes counter-clockwise:
North, west, south, east then north again