This is just a thing that I made when I was playing with my little brother. I did a quick search and none of the knex house results were piece efficient .
So I made a house that was piece efficient for you guys to make. These are the pros and cons.

Pros
Looks decent
Not at all piece consuming
has a door
Shaped like a dome XD
Cons
NONE!!!!

Lets get building!!

*sorry if the pic quality is bad, I was using my iPad and a iPhone XR as a camera .

Step 1: Piece Count

This is useful if you want to make sure if you have enough pieces to build a project.

RODS
Green Flexible rod: 9
White rod: 2
yellow rod:8
CONNECTERS
White full moon:1
Red 3 Prong: 2
grey/Purple 4 Prong connecter: 16

Step 2: Base Frame

Pic 1 Get you 16 connecters
Pic 2-3 Connect them like so in the picture.
Pic 4 get all of your 8 yellow rods.
Pic 5 Connection

ON To The Next Step.

Step 3: Door

Pic 1 Unclip the left side of a yellow connecter.
Pic 2 Get these pieces
Pic 3 make these
Pic 4 add on things you made on the yellow rod.
Pic 5 add the flexible rod on.

On to the next step