Most building codes require that spindles or balusters on deck and stair railings be spaced no more than four inches apart. This safety standard, often called the '4-inch sphere rule,' is designed to prevent small children or pets from slipping through the railing. A good way to visualize this is that a 4-inch sphere should not be able to pass between two spindles. For the same safety reason, the space between the bottom rail and the deck floor should also be no more than four inches. As a general guideline, professionals often install three balusters per foot of railing. However, since specific requirements can vary by location, it is crucial to check your local building codes to ensure compliance before starting your project.

Both deck footings and deck posts help prop up your deck. However, footings are the bottommost parts of a deck that touch the ground. They’re usually made of concrete. Posts are pieces of wood that attach to the top of the footings with brackets. They run upwards and connect to the underside of your deck to support its weight.

Choosing whether your deck should be lighter or darker than your house is a matter of personal preference, as there is no right or wrong answer. However, considering the pros and cons of each can help guide your decision. Darker colors are often chosen because they show less dirt, footprints, and marks from daily wear, making them easier to keep clean. On the other hand, lighter deck colors tend to stay cooler in the summer. From a design perspective, using a deck color that contrasts with your home's exterior can help make the deck a more defined and distinct feature. Consulting color theory can also make the process of choosing a complementary house and deck color combination easier.

When deciding if you should use 2x6 or 2x8 deck joists, consider the size of the deck, joist spacing, and materials. Larger decks, larger-spaced joists, and weaker wood all require more support, meaning they need larger joists. For example, 2x8 redwood joists spaced 16 inches apart can only safely span up to 10 feet and 7 inches. On the other hand, 2x10 southern pine joists spaced 12 inches apart can be as big as 16 feet and 2 inches. If you aren’t sure what size joist is best for your project, speak with your deck builder.