Som Goswami

Are you generating an ‘up’ as well? That helps to align the pillars. Make sure the normal up and tangents are orthogonal to eachother.

What Kahuna031 suggested is the best idea.
I can add to his point by suggesting a workflow for sending multiple parts to houdini at the same time. Here you can still achieve a houdini->maya approach without tediously adding individual parts. what you can do is:
1) assign the parts(geometry) into several groups like Window_Type1, Window_Type2, door_Type1, door_Type2, etc.
2) Then inside of the houdini when you get your object merge, you will see in the primitive panel, of the geometry spreadsheet, the groups as “Window_Type1/geometry…” etc.
3) You can then parse the geometry in a wrangle to separate out the components.

But that being said, it may be a cute way for Houdini to parse out your models, but the fundamental logic of construction of a house will rely on the Houdini side of things. So you can use this approach to send multiple parts as a single input to Houdini for house construction but it will be better to have barebone construction of house first and then point instance the parts in place (Just like others advised).

Hey Nima,
Thanks for your reply. The glue sop works but I realized that increasing the substeps help as well without me adding additional nodes.
I am slowly learning how dops are working and I really appreciate all the help.
Regards,
Soumitra Goswami