This is no place to build a deck because your door is already at grade. A deck is for when the door is some distance above grade, making a patio impractical and expensive. At most, you could resurface the concrete with a thin product to improve it's a appearance, or clean it with a pressure washer and accept it as concrete. But it's certainly useful as a patio.

The gap at the house amounts to little. You could fill it with butyl rubber caulk. Warning, it's not cheap.

The soil slid down the hill and washed away because there are no good grass or low groundcover plants to hold it in place. It looks like there are nothing but mowed weeds. Kill them with gyphosate, replace the lost soil and plant with a good groundcover that will grow together solid in a reasonable amount of time. Grass would be a PITA to keep up with in such a small space. Even though you didn't tell us about the light conditions, I'm guessing that it's too low level for growing grass. I wouldn't think this slope is a good area for artificial turf either.

Thanks for the feedback. The house faces east, so we get a ton of light in the beginning of the day and afternoon at night the sun is in our backyard. My neighbors have tried everything for grass but cant seem to grow any because of the runoff.

If I am reading your feedback correctly, you are saying we can fill the gap, and pressure wash the current concrete or apply a thin coat of something to give it a bit of a facelift?

What can be done about the end of the concrete showing what was once hidden? It looks atrocious! Thanks again for all of your feedback

My first thought was a retaining wall and soften up the edges with plantings. You can also get outdoor rugs to cover the concrete and anchor furniture.

We have a huge slope out back and a proper retaining wall has given us peace of mind that our deck won't slide away!

Cute puppy!

Thanks! I forgot to mention the retaining wall. Sorry as I am very new to this, but essentially, could we build a small retaining wall that starts at a lower part of the backyard that ends level with the patio?

That was another idea we had but werent sure how it would look since the drop is only about 6-8" so there wouldn't be that much of a "wall".

Maybe dig a little deeper to create a bigger one? Also, does something need to be done under the current concrete if we add a retaining wall to prevent both from starting to slide down?

As I mentioned in the last paragraph of my first post, you need to add soil back in order to cover the edge of the slab and plant groundcover to hold that soil in place.

Pick the groundcover that works best for your and your conditions. Make sure while they are young that they are getting all the care -- water & fertilizer -- that they need, on the schedule THEY need. They WILL grow.

Retaining walls tend to be expensive relative to their size. You can make this work without one, as I've described. If you want one, it can work, but what would the point of one be if it's right next to the slab? The closer it gets to the fence, the more likely you are to create a trash-trapping ditch that "feels" awkward. If you were going to do a decent retaining wall, you would go all the way to the fence, remove it, build the wall (with returns at each end of your yard) and replace the fence on top of the wall so that you had a nice level yard. But this would cost some bucks. I'm thinking you would be happier with repairing/re-establishing the grade and planting some nice, very low groundcover.

BTW, there are a variety of coatings made to cover old concrete. Search "concrete color coating" in Google Images to start researching possibilities. Make sure to use something made for OUTDOOR conditions.

great information - thank you! Our only issue with the flower bed is the little beast you see in the pictures I put in the album above. They don't stand much of a chance with him out there as hes still very much in his puppy years (at this rate it seems like hell always be) and he is a wrecking ball that will ruin the flowers almost indefinitely. Our perfect scenario would be to have a backyard entertainment space that was grass (or the axed idea of turf), and the patio with a patio set and BBQ.

Maybe rocks would be better? Our next door neighbor has the same issue as us, but they put up a deck and turf (our initial idea) and it looks pretty nice and where we got our initial idea from. I will take pictures of that and maybe you guys can tell me if you think its sustainable?

Rocks do not have roots and cannot hold soil together. Small plants must be protected, but once they establish (groundcover usually not that long) then they can withstand some activity.

Show a picture of the neighbor's solution. Please upload it directly into this thread in order to save everyone time.

My apologies, as our neighbors set up is a lot less slanted than ours. Their back property wall is higher than ours so there is not as aggressive a slope as what we have

After numerous houzz/google searches, I couldn't really find any inspiration for solutions on our patio. I guess it is just best to call a mason and see what he suggests?

Solutions for resurfacing? Search "pool deck resurfacing".