Does anyone know if labor for installing 4mm vinyl planks (Tranquility floating floor with locking and Tranquility underlayment), at $1.80/sq.ft is high/low for Seattle market? The place is 900 sq.ft to be installed. Total quote for install labor is: $1620 including side moulding labor (but not material).oes anyone know if labor for installing 4mm vinyl planks (Tranquility floating floor with locking and Tranquility underlayment), at $1.80/sq.ft is high/low for Seattle market? The place is 900 sq.ft to be installed. Total quote for install labor is: $1620 including side moulding labor (but not material).