This video looks at a couple of design options including attaching the roof ledger below that of the existing eaves and setting the patio roof atop the existing roof.
How to attach a wood awning to a house.
For building a wooden awning in the patio you will need wood posts wood beams nuts screws washers bolts and covering sheets.
Retractable or fixed a lateral arm retractable awning will allow you to extend your awning without needing extra supports.
Existing patio is outside the dining room on the west side of the house.
Lift the awning into place and bolt it to the brackets.
Attach the brackets to the house even with the chalk line making sure they are plumb.
A small awning will generally not have these problems.
Fastening to masonry walls.
For motorized awnings plug the cord into an electrical outlet and use the remote control to extend and retract the awning.
These awnings only need one attachment to the house on the wall.
They are made out of vinyl canvas or solution dyed acrylic.
Drill holes for the expanding anchors every 16 inches or as specified by local codes insert the anchors hold the ledger in place and tap it with a hammer to indent the anchor locations on its back face.
They are in essence oversized swatches of water resistant fabric connected to a frame and attached to your house or some other structure.
Larger patio awnings may require permits or permission from the zoning board.
The patio is essentially unusable on a sunny afternoon in the summer.
Wall space needed for attaching.