Can you post the whole front elevation plus the side elevations? And circle the areas in question...

This is what 3D computer modeling is for.

Ok, a little more information would be helpful.

You said “I am in the design phase” then later mention a “designer”. Did you create these drawings or did you hire someone? If so, what is their professional title?

How about a couple pictures of what your house looks like now? That’s all a bit of a mess but I can’t tell what is new. Do you have a 3D model of the house as RES2 suggested , or just the 2D elevations?

The info you supplied so far implies you worked out floor plan with no consideration to impact on house exterior. You may need to make some changes on that part to make this work. Can you post the floor plans?

I hire an Architect to create the drawing for me. I have only 2D elevation. The marked roof line is cut back to match the roof line of another side. It seems nothing to do with floor plan, just because the different level of these two roof lines.

IMO this is reason for an architect who can often even give you more than one option for this dilemma/

"The designer suggested cutting back the roof line facing to the street "

You do not have an architect you have a designer. An architect would have had the problem resolved long before the drawings got to this stage and you never would have know it was an issue.

It looks like every window had a different head height; why? The roof line that extends down is drawn incorrectly on the elevation. It is drawn as if it's a hip roof when it's actually a rake.

Only the window of deck had a different head height. The reason is the deck floor is two step higher than indoor floor to leave enough height for the car port below.

I can clearly see that no two windows or doors have the same head height in either elevation. It's hard to tell if they line up from one elevation to the other as the designer has chosen to have frieze board on southeast side and not northeast.

I think the window head height could possibly be adjusted, but the problem is how to match the roof lines.

Hip the lower roofs with the eave line at the higher level. This may or may not work because the information provided is very little. With a remodeling the existing conditions are a driving force in the design. Next time, and for those lurking, hire a good local architect to do what they are trained to do. Or architectrunnerguy and his magic wand.

A deck is usually lower than (or at the same height as) the adjacent interior space. Your idea sounds like a tripping hazard, as well as creating the opportunity for water to be driven into your home and siding. It probably will also cut down on light.

Maybe you need to look for alternative parking.

What do you mean hip the lower roof with the eave line at the higher level? I think another problem is the polar which support the tip of eave will not exist, how to support the wide eave if not cut it back.

You have hired the wrong design person. One who is creating problems instead of resolving them. Hire an actual trained design professional. A software manipulator who hasn’t even managed mastery of that is not a design professional.

It looks like there may be more problems than the roofline question you were originally asking about.

Could you post the entire floor plan, and circle or color in what’s new?

Post pictures of the outside of your house.

And also indicate where you are for referenc ( state or country if not the US)

Main floor

I’m confused. Why is the roofline with the living room a problem? You don’t have that circled as an addition?

It finally proved to be a mistake of the architect. Thanks all!

Another question. In anther side of house, I also want a straight roof line here. I think there should be better solution instead of overlap the roof line.

You need to post both elevation views please

From Northwest side, this could not be seen.

It's drawn incorrectly.

What do you mean really?

The floor plan and the elevation show the wall is continuous and the roof overhang is continuous, yet the elevation shows a jog in the height of the fascia. In addition the roof appears to be continuous, yet there is a line indicating a hip roof. Also the alleged hip roof terminates in a violation of geometry.

You mean it should be continuous instead of overlapped in the elevation? If the slopped angel of two roofs are different, it should be no problem to have a continuous roof line, right?

So it should be this?

Fire this doofus. 🤦🏽‍♀️