There are three basic choices for parents wanting to build a play set for their kids, says Scott Schulz, owner of Rainbow Play Systems of Sacramento, Calif.

“You can buy the plans, then go and buy the wood and hardware yourself,” he says. “You can buy plans that come with the hardware, and you purchase the wood separately yourself, or you can buy a complete package with plans, hardware and wood already cut.”

Whichever you choose, Schulz recommends that parents first ask themselves a few questions:

How old are your children?

Most play systems are designed for children 2 to 12 years of age. Think about how many years your kids will use the swings or other components, Schulz says. The biggest mistake parents make is buying a play system that their kids will quickly outgrow, leaving it to sit empty in the backyard because it’s no longer a challenge or fun.

Is the plan flexible?

Can the structure be turned different ways to fit a site, or can components be added as kids grow? Very young children aren’t ready for monkey bars, for example, but older kids love them. Make sure you can add components later.

What’s the weight limit?

It’s helpful to see the structure you’re buying already assembled so you can get a feel for its stability and durability, Schulz says.

Is the lumber of good quality?

Schulz recommends using redwood or cedar, and avoiding chemically treated lumber. Make sure the supports are hefty enough for the structure. He recommends 4-by-6 supports.

Does it come with a warranty?

Know which parts are guaranteed and which are not.

Do you have enough skill and time to build it?

The prefab kits are easy to assemble, he says, and can generally be done in one or two days. If you’re going to cut the lumber and drill the holes for bolts yourself, then you need basic carpentry skills, as well as the tools to do the job properly.

Is the site appropriate?

Make sure you have a level site that has ample room around the structure. Stay away from retaining walls and fences where kids could fall and get hurt.

Will you maintain the structure?

Routine maintenance is important. Check to make sure bolts remain secure and ropes aren’t frayed.