User the garage door as a baseline. Two car garage is 16’ Looking at this image, you could tell that the roof line goes about 2 feet past the garage door and both sides. It’s now you’re at about 20 feet. Then, when you look at the roof above the entranceway, you can see the right leg and a left leg of the pitch on the roof. Since you know one car door garage is about 8 feet wide, then imagine if that is about the length of a one car garage door, roughly. so it is from what I’m seeing. So now you have 8 feet on the right and 8 feet on the left. Plus a little bump out to the left to the right for the roof to come away from the roof so it’s another one to 2 feet so let’s just say there’s another 20 feet there. So to the left of the front entranceway porch roof you have that flat roof and yeah figure that’s maybe another 10 feet. So roughly you’re looking at about 50 feet on the first floor. Using the garage door method, looking at the roof above the garage door and the second floor let’s just genetically and quickly call that 20 feet. Then you have the double roof to the left let’s say that the small roof is about 12 feet and then there’s that short leg that is about 4 feet and then you have that long leg on the back roof which is probably 13 feet to 15 feet. So now the second floor is looking like 12×2 is 24+4 is 28+ the 20 is 48 so let’s just round off to 50. So at the bottom and the top you’re at 50+50 = 100. The reality is that this is such a small project that sure you could add 10% or 15% but you know if you have to add another 10 or 15 bulbs that’s not gonna freaking kill you, now if it’s a house that has hundreds and hundreds of feet then yeah you’re gonna wanna be a bit more accurate but for a quick and very quick quotes, my math works good enough for me.