Residential construction is full of challenges and small problems that need to be solved, just like commercial construction. The difference is you need to be able to respond to these things within a smaller amount of space and a relatively constrictive level of budget. You still need to make sure that everyone's needs are reasonably met, and you have a lot of masters to please.
Some of the most fundamental problems you're going to run into are difficult environmental conditions, small spaces, and the need to save on materials where and when you can. As much potential for profit as there is in residential construction, you still need to keep your eyes on the prize and mind your profit margins to keep them reasonable.
Durability Under Pressure
The construction world is full of deadlines that can seem more than just challenging, as well as the sheer pressure of the materials. People don't think about it, but their homes may weigh 100 tons. This pressure isn't just the structure of the home itself, but the items inside of it. Everything is being forced around in some fashion or another.
This is why you need to ensure that all of your pipes, as well as all of their flanges, are in tight working order. This order needs to include the ability to withstand significant amounts of pressure within them, as the pressure levels can vary. Even in something fairly light, such as residential water, the pressure can cause weaker couplings to buckle under the pressure. If you're working with something that takes more girth, such as a water-based radiant heating system, you're in it for even more need for durability.
Tight Spaces and Tight Angles
The spaces inside of a home can be small, especially if you want all of the pipes and wires to be concealed. Otherwise, things can start to look like a naval vessel, with pipes running every day. This is part of the reason why it's crucial to have a proper elbow union for males that will allow for good passage through the walls.
Another reason why it's imperative that you have solid passage through the walls and can make solid corners is to save materials. Running everything in the most linear and direct way possible might sound like a good idea at first, but it's anything but this in actual practice. For most building projects, having a few elbows at major areas, and then using splitters is a far more efficient way of keeping the pressure solid and the pipes in the right places.
When your pipes are lined up well, and you use the right fittings, the system becomes a thing that simply sits in the background quietly doing its job. When the pipes are done just right, no one is going to ever know how well you did at selecting the materials. However, if you make a mistake, everyone is going to find out with quickness.