Multipurpose outdoor rooms are exploding in popularity. Before you begin building, discuss what you want from an outdoor room. How will you use it? If you like to entertain, plan for plenty of seating. If you have an active family, think about how the kids might utilize the space. Do you love outdoor cooking and grilling? Think counter space, storage, and cookware.

If you'll be using your deck as a kitchen, save major bucks with these tips. Avoid the price tag of built-in cabinetry by using watertight plastic storage bins that tuck under the counter. And use stainless-steel fixtures. Trust us: They're worth the up-front cost. They don't expand and contract with weather changes, so you won't need to replace them every couple of years.

DIY Tip: Choose composite, rather than treated, lumber if you want virtually maintenance-free decking. Composite comes in several colors and finishes, and it's a breeze to install.