Spacing on the beam: three published layouts, side by side

Nobody agrees on the inches. Here is what four sources actually say, and where they overlap.

Why the numbers disagree

Search for swing spacing and you get four confident answers that do not match. That is not sloppiness. Public playground guidance and backyard build plans are solving different problems, and the plans are also fitting a particular beam length.

So rather than pick a winner, here is what each one says, with its name attached.

The three build layouts

Eastern Jungle Gym lays out six hangers on a beam at eighteen, eighteen, twelve, eighteen, twelve, eighteen inches on center. Grimmett measures ten inches in from the inside edge of the bracket to the first mark and then steps twenty four inches at a time. Abbotts At Home keeps eighteen inches off each end of the beam and eighteen inches between the pair of hangers under one swing, which leaves about fifteen inches of clear air between neighboring swings, and notes that the industry floor is twelve to sixteen inches of clearance.

Read them together and a shape appears. Roughly a foot and a half off the ends, roughly two feet between seats, and never less than a foot of air between one swinger and the next.

What the norms add on top

The CPSC public playground handbook asks for twenty inches between swings and between a swing and its support, measured at a height of five feet. Retellings of it in the trade press round that up to twenty four inches seat to seat and thirty inches out to the frame. Those figures were written for equipment in a park, not for a beam in your yard, and they carry no force over a home build. They are still the most examined numbers anyone has published on the subject, which is why builders quote them.

How many swings fit

Old Salt Farm puts three swings on a twelve foot top beam and two on a ten foot beam. Finished frames in the published plans come out around twelve by eight by eight feet, and one at thirteen feet three inches long by seven feet three inches wide.

The pair width for a bench or a porch swing

A bench does not hang from two points the way a strap seat does. Set the hangers wider than the seat so the chain runs clear of the arms instead of rubbing them. Two to four inches wider on each measurement is the common figure and Lowes says four to six. For a fifty inch swing that puts the hangers around fifty two to fifty four inches apart. For a sixty inch swing, sixty two to sixty four.

Seat height, where nobody agrees at all

This is the number with the widest spread in print, and pretending otherwise would be dishonest. The CPSC floor is twelve inches for preschool age and sixteen for school age. American Swing and most toddler bucket seats sit around twenty four. Household advice lands on seventeen to nineteen. Some retailers say eight to twelve. A porch swing wants nineteen to twenty one, or eighteen to twenty two once you account for a cushion.

The practical version: high enough that feet do not drag at the bottom of the arc, low enough that the person using it can get on without a hop.

Chain length without a calculator

Chain length is the distance from the ground to the beam minus the distance from the ground to the underside of the seat. That is the whole formula. Grimmett budgets around ten feet of chain per swing. A four point bench hangs on an inverted Y, and you tilt the seat by moving the attachment one or two links, on both sides by the same count.

Room around the swing

The published clearance in front and behind is twice the height of the top beam, with a minimum of six feet all around. Household versions say six to eight feet out to fences, walls and trees. A porch swing wants eighteen inches behind it, fourteen to sixteen at the sides, and at least four feet of travel, plus another two to four feet if it hangs on two chains rather than four.