Door awning structural help

Any more then 2' I would not trust it with out some form of support.
Post, wall brackets, something.
What can happen depending on what your mounting it to is it will sag or pull away from the wall causing it to leak.

I have seen engineered roof trusses overhang 4 feet without supports. But if you're building them on your own, I wouldn't span more than 2 feet.

Can you give more info?

Ranch?
Colonial?
Wall Height?
Picture?

Going to be interesting trying to put a roof over that with T111 siding.
No good way to keep water from rotting out the siding without some major rework.
T11 can not be any closer then about 6" from any solid surface such as a roof without splash back which will cause it to rot.

Ah sorry, the siding and sheathing are being replaced and vinyl is going up. The height is one of my concerns as the awning would have to be higher than the band board due to the step up or stop with enough clearance for head room on the step.

Looks like a no brainer to me. Put a shed roof over it with two posts outboard to support the roof. screw a 2 x to the T1-11 level, saw cut and remove. Flash under and over the new shingle roof. Screw a 2 x 8 ridge plate to the studs of the house with 2- 3/8 x 3.5 inch Lag screws per stud, and frame her out with 2x6 rafters. Put vents on the sides. I would make it bigger than the well by at least a foot for wind blown rain, and with the posts you could even install trellis for some privacy, and partial wind block.

Good Building.