how much does a new vinyl siding installation cost? | ask. the best i can offer is rough price range for a 1200 square foot house. figure 4 to 6 dollars a square foot for the siding $4800 - $7200 and $1800 - $2500 for trim pieces nails window treatments vents etc. this will give you a rough budget of between $6600 and $9700 for the siding on the house. i hope this helps!