What is a common feature of most bathrooms designed following standard sizes?

Optimized plumbing layout is indeed a common feature of most bathrooms designed following standard sizes. When bathrooms adhere to standard dimensions, it allows for more efficient placement of plumbing fixtures. This optimization minimizes the amount of piping required, which not only reduces material costs but also shortens labor time during installation. Standard sizes often dictate the locations of toilets, sinks, and showers, leading to a design that can streamline plumbing connections, making it easier to manage water distribution and drainage effectively.

In contrast, increased floor space for accessibility may be a design goal in certain contexts, such as for compliance with ADA guidelines, but it’s not a universal feature of standard bathroom sizes. Exterior windows for natural light can enhance a bathroom's ambiance but are not standard in every bathroom layout, as they can conflict with privacy considerations. Pre-installed cabinetry for storage may be offered for convenience, but it is not a necessary characteristic of standard bathrooms, which vary widely in terms of design aesthetics and functionality.