Make a Concrete Garden Bench

Make your own Concrete Garden Bench. Build a form to cast the concrete bench legs. This modern concrete and red cedar bench has simple, clean lines. This is the first bench of the series. This is Part 1 of the series.

make a Concrete and Wood Garden Bench
Watch this video on YouTube.

See the Youtube Video and download the Plans.


Background for the Concrete Garden Bench ONE

Hi everybody this is Kent from man about tools and today we’re making this wood and concrete garden bench.

the author and the outdoor concrete garden bench
Concrete Garden Bench

I’ve been wanting to make some benches to go along with the concrete garden boxes I’ve been casting. I like the blend of concrete and wood with simple, clean lines. This design has square concrete legs and a flat planked wooden seat. Here’s how the bench goes together.

Concrete Garden Bench Design

Animated assembly of the outdoor concrete and wood garden bench
Concrete Garden Bench – Square Legs to match Garden Boxes

The concrete legs have three protruding seat bolts at the top and one bolt on the inside to attach a stretcher.

Animated assembly of the outdoor concrete and wood garden bench
Garden Bench ONE – digital design

Three planks make up the seat.

Animated assembly of the outdoor concrete and cedar garden bench
Nut on Stretcher Bolt

Nuts with washers are threaded on the stretcher bolts through a hole in the side.

Animated assembly of the outdoor concrete and wood garden bench
Nuts hold seat planks to legs

The seat planks are also secured with washers and a nut. And two ties are screwed to the bottom of the planks.

Finished Bench

the final concrete garden bench
Oh she’s a beauty right?

I wanted to make strong connections between the concrete and the wood. I know there’s a number of ways of doing this with drilled anchors and brackets. But, for this first bench in this series I wanted to try casting anchor bolts in the form during the pour. In the similar fashion as a house foundation with anchor bolts for the sill plate.

the final concrete garden bench
Stretcher gives stability

Form for casting the concrete legs

And so nothing else would be needed once you stripped the form from the casting. Now I know this would mean a bit more work in the construction of the form, but building the bench in the end should be faster and should make it very sturdy.
So here’s the form for casting the legs.

Animated assembly of the outdoor CSA concrete and wood garden bench
Form Design for pouring legs

The form has a 3/4″ plywood base with an angled inset attached, just like the the garden boxes.

Animated assembly of the outdoor concrete and wood bench
Inset attached to base

A two part block holds the seat bolts in place and can be taken apart after casting.

Animated assembly of the outdoor concrete and wood garden bench
Bolt block

The end wall and side walls are made of plywood. The anchors are 3/8th’s galvanized carriage bolts 3 1/2″ long.

Animated assembly of the outdoor concrete and wood garden bench
Carriage bolts sit in bolt block

The form has a bridge that holds the stretcher bolt in place.

Animated assembly of the outdoor concrete and red cedar garden bench
The bridge holds the stretcher bolt while pouring concrete

This stretcher helps to prevent side to side racking, as the seat boards have only a single attachment point on each end.

Animated assembly of the outdoor concrete and wood garden bench
Form Bridge Assembly
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