Just FYI olioboard has shut down. Thanks for replying though!

Sometimes the "pros" here are not very professional about their comments. It is okay, can help others learn who they may not want to hire I suppose. I totally understand we all have budget considerations. I am building a snout-house from a modified master plan belonging to my builder, who is one of 3 builders in a city subdivision development, on a typical narrow lot. My budget would not be small in some places others live who post here, but here it does not go as far as others! It would attract all sorts of negative comments here starting from "where is the architect in this" to "nice garage - where is the house?". LOL. I am quite happy with the garage that will have plenty of function in our climate though ;) You are braver than I am for posting in first place! However, I do also have concerns about dealing with water (and maybe snow and ice, depending on your climate) with those joined roof lines. Please make sure that whatever the design is, it includes more that sufficient consideration for that or you will find saving money on hiring a friend to do this will cost you far, far more in the long run than hiring at least a design-build firm would have (even if not an architect). That is a priority over "unifying the exterior". First water issues, then worry about "unifying". To do the latter, it will be difficult as the addition will look like an add on almost no matter what. But, one thing you can do is remove the old front door. Having two front doors just adds confusion. Then I would use the same siding right across the front, maybe Hardie Plank. Don't go crazy with siding choices. It looks best to limit to 2-3 styles, but be cautious of those styles too. Don't go mixing brick with stone, etc. As for colour, depends somewhat on your surroundings and preferences. I like the dark gray-ish siding you have now, with the white trim.

i draw homes on 3d images using sketchup to make colors ,materials...decisions with my clients , check out my works

I actually like the arch and brick detail, although I do understand houssaon’s POV and it’s good to see different possibilities. I think I would keep the brick arch and restore as much brick as possible and maybe bring in a bit of wood detail, also. Is you would like to see how different ideas could work on your house, I recommend this company. https://www.houzz.com/pro/uoflcardfan77/creative-visual-concepts-kevin-strader