The most common type of picnic table that you can build yourself is a one-piece wooden table. This type of picnic table has an A-shaped frame that supports both the table surface and two long benches. It uses pressure-treated lumber, nails and bolts to stand up to the elements. A one-piece table is the simplest design with its built-in seating and limited list of materials. You can also customize the table's length to accommodate four, six, eight or more people.
Another do-it-yourself picnic table option is a three-piece table that consists of a table and two separate benches. The design may be similar to a one-piece table without its benches, or entirely different since there's no need for a frame that includes places for seating to mount to it. Separate benches make the table easier for one person to move since each section is lighter than a one-piece table. They also allow picnic table users to adjust the distance between the bench and the table for more comfortable seating.
Most standard picnic table plans are built for average-sized adults. While these tables may still accommodate children, a kids' picnic table uses less material and is customized for the lower height and shorter reaching distance of children. A kids' picnic table is basically a smaller version of a full-sized table, and can use a one- or three-piece format. Kids' picnic tables may also feature round sanded edges to reduce the risk of scrapes and splinters.
Commercially available picnic tables come in a wide range of materials, including plastic and metal. While forming a metal table may be too difficult for an amateur carpenter, a wooden table with a metal frame is still an option. Thin metal tubing and prefabricated joints can replace the wooden frame of a one- or three-piece picnic table. Treated metal frames are more durable than wood, allowing you to replace the benches and tabletop boards as they deteriorate while keeping the same metal frame.