If you’re looking for a relaxing and stylish outdoor project, building a DIY swing bench for your pergola is one of the best woodworking projects you can take on. A wooden hanging bench creates the perfect place to sit, relax, read a book, or enjoy time with family in your backyard.

This step-by-step guide will show you exactly how to build a strong, comfortable, and beautiful DIY swing bench using simple lumber and basic woodworking tools. Whether you’re adding this bench to a pergola, covered patio, porch, or garden structure, this project is beginner-friendly and gives your outdoor space a high-end custom look without the expensive price tag.

This swing bench is designed to be sturdy, comfortable, and attractive while still being simple enough for most DIY woodworkers to build in a weekend.

What You’ll Build

You’ll be building a 60-inch long wooden swing bench designed to hang from a pergola using heavy-duty chains and screw eyes. The bench includes:

• Strong base frame
• Comfortable angled backrest
• Armrests on both sides
• Slatted seat and back support
• Hanging hardware for safe suspension

This design creates a classic porch swing look that works beautifully in almost any backyard.

Why This Project Is Worth Building

A DIY pergola swing bench offers several great benefits:

• Adds beauty and value to your backyard
• Creates a relaxing outdoor seating area
• Costs far less than buying a pre-made swing
• Customizable to fit your space
• Stronger and better quality than many store-bought options

Now let’s start building.

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Download Printable Plans in PDF

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Note: Lumber dimensions are listed as nominal size.  See lumber sizes for actual dimensions vs nominal.

Disclosure: Some of the links on this page as well as links in “tools for this project” and “material list” sections are affiliate links.

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Dimensions

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Step 1 – Cut the Front and Back Base Rail Boards for the DIY Swing Bench

Start by cutting the two longest boards that form the main base of the swing bench. These boards will support the entire seat frame, so accurate measurements are important.

Use 2×4 lumber for this step.

Cut one front base rail to 60 inches long.

Then cut one back base rail to 57 inches long.

The front rail is longer because it extends past the side seat supports. This extra length will later provide space for attaching the armrest legs.

The back rail is slightly shorter because it sits flush with the back support structure.

This tutorial is designed for a 60-inch-long swing bench, which is a comfortable size for most pergolas and outdoor spaces. If you want your bench to be longer or shorter, you can adjust these measurements to fit your needs.

For example, if you want a wider bench for extra seating, simply increase the length of both base rails. Just make sure the front rail remains longer than the back rail so the armrest supports will fit correctly later in the build.

Before cutting, use a tape measure and pencil to mark each board clearly. Double-check your measurements to avoid mistakes and wasted material. Use a miter saw or circular saw to make clean, straight cuts.

Step 2 – Cut the Seat Rail Boards

Cut the seat rail boards that will connect the front and back base rails of the swing bench. These boards also help create the angled backrest, making the bench more comfortable to sit in.

Use 2×4 lumber for this step.

Cut three seat rail boards to 22 inches in length.

On the back end of each board, make a 20-degree miter cut. This angled cut is important because it creates the proper slope for the backrest. It allows the back of the bench to lean slightly backward instead of sitting straight up.

Make sure all three boards are cut to the exact same size and angle. This will help keep the bench frame level and ensure all parts fit together correctly during assembly.

Use a miter saw for clean and accurate cuts. Measure each board carefully, mark the cut lines with a pencil, and double-check the angle before cutting.

These seat rails provide support for both the seat and the backrest, so accuracy is important for strength and comfort.

If you plan to build a longer bench, you may need to add extra seat rail boards for better stability and durability. Additional support helps prevent sagging and makes the bench stronger when holding more weight.

Keep in mind that adding more seat rails will also make the swing bench heavier, so be sure your pergola or support structure can safely handle the extra load.

Step 3 – Make the Back Support Boards

Next, cut the back support boards that will form the angled backrest of the swing bench. These boards help support the back slats and create a comfortable leaning position when sitting.

Use 2×4 lumber for this step.

Cut four back support boards to 23 inches in length.

Since the backrest is designed to lean backward slightly, each board needs a 20-degree miter cut on the bottom end. This angled cut allows the back supports to sit correctly against the seat frame and creates the proper backrest angle.

Make sure all four boards are cut to the same length and angle so the back of the bench stays even and balanced.

For the best results, use a miter saw with an adjustable guide or laser guide. This helps make clean, accurate cuts and keeps all pieces consistent.

After cutting the bottom angle, trim one top corner of each board at a 45-degree angle. This small cut improves the appearance of the bench and removes sharp corners that could be uncomfortable or unsafe.

These back support boards will be highly visible in the finished project, so take your time and make each cut clean and precise. Properly cut supports will make the entire swing bench stronger, safer, and better looking.

Step 4 – Attach the Back Supports to the Seat Rails

Now begin assembling the seat rails and back support boards that were cut in the previous steps. This section creates the main support structure for the seat and backrest of the swing bench.

Start by taking one seat rail and attaching it to one back support board using 2 1/2-inch wood screws.

Position the bottom of the seat rail against the angled bottom end of the back support so the pieces sit flush together. Make sure the 20-degree angle is facing the correct direction to create the slanted backrest.

If your 2×4 lumber is very dry, pre-drill pilot holes before driving in the screws. This helps prevent the wood from splitting and makes the assembly stronger and cleaner.

The center bench support should have double back supports for extra strength. This middle section carries the most weight, so using two back support boards helps improve durability and support.

The left and right bench supports should each have only one back support board.

Before securing everything permanently, place all the assembled support sections next to each other or stack them carefully to compare the angles. This helps make sure all pieces line up correctly and that the backrest angle stays consistent across the entire bench.

Once you confirm that everything is aligned properly, drive the screws in fully and complete the assembly. Accurate placement here is important because these support sections will hold the seat frame and determine how comfortable the finished swing bench will be.

Step 5 – Attach the Base Rails to the Bench Support

Now that the bench support assemblies are complete, you can attach them to the front and back base rails. This step forms the main frame of the swing bench.

Start with the back base rail.

Position the middle bench support exactly in the center of the back rail. Make sure it is aligned evenly so the weight of the bench is distributed properly.

Once centered, secure it from underneath using 2 1/2-inch wood screws.

Next, attach the left and right bench supports in the same way. Space them evenly and ensure they match the layout shown in the reference image.

Check that the back base rail sits flush with the rear edges of all bench support pieces. This creates a clean, straight back edge and ensures proper alignment for the backrest slats later.

After the back rail is installed, move on to the front base rail.

Attach the front rail using wood screws driven from underneath the frame.

Make sure the front rail is positioned correctly. It should extend 3 inches past both ends of the seat rails. This extra space is intentional and will later be used to attach the armrest legs.

Before tightening all screws, double-check that the frame is square and all supports are aligned correctly.

Once everything is in position, drive the screws in fully and securely. The frame will carry significant weight, so all fasteners should be tight and well seated in the wood.

Step 6 – Cut Armrest Boards for the DIY Swing Bench

Now cut all the boards needed to build the armrests. These parts will create the sides of the swing bench and provide both comfort and structure.

Use 2×4 lumber for all cuts in this step.

First, cut two pieces to 10 inches long. These will be the front armrest legs.

Next, cut two more pieces to 6 1/2 inches long. These will be used for the arm bracket connection.

The armrest design follows a similar layout to the bench support structure from Step 5, so the angles and connections will match well.

Now cut the angled support pieces:

Take two pieces of 2×4 lumber and cut them to 24 3/8 inches long. Add a 20-degree miter cut on the back end of each board.

Then cut two additional back support pieces to 12 3/8 inches long. On these boards, make a 20-degree miter cut on the bottom end.

After that, trim one top corner of each of the 12 3/8-inch pieces at a 45-degree angle. This helps the pieces fit together more cleanly and removes sharp edges.

Make sure all cuts are accurate and consistent. These pieces will be visible on the finished bench, so clean cuts are important for both strength and appearance.

Once all parts are cut, lay them out in order and check the fit before assembly. This step prepares the armrest structure so it can be assembled smoothly in the next stage.