On Thu, 16 Feb 2017 10:08:22 -0800 (PST), trader_4
wrote:

Would the OP need an inspection? How would that impact on a DIY beam?

Depends on the local requirements. Here in NJ, since it's structural,
it would need a permit and inspection. And how substantial the support
needs to be would seem to depend on what the load is that it's supporting
from above.

Some garages use a steel I beam for a double car garage span. Building
my patio cover I used a LAM Beam for a 24 foot span on three columns.
There are concrete lentils used for windows & doors.