I am not sure if you are in the US or where in the US, but $14k is very decent. Not only they have to build a new brick column, foundation and supports, the have to make sure to match your fence perfectly or it wont work. Maybe try to get other quotes but be careful on scope of work.

I would try with the foam companies but how are they going to match it to level and work with the electric gate? it will be very tricky.

Fancy things have fancy prices... good luck bro.