Why build a U-shaped patio sectional couch?
The casual U-shaped sofa lounge can create that cozy space to enjoy a hot chai tea, coffee, or just snuggling around a fire pit wrapped in a blanket.
Overall, the patio couch creates a fun hang out place with adequate seating to host large parties and gatherings in any season. The patio sofa also enables all the guests to be able to easily interact and see each other without having to turn around. The result is that you have a more intimate social space to foster relationships.
A new U-shaped sectional patio sofa can cost as much as $3,000-$4,000. These DIY plans offer a way to save big and provides easy, simple, and clear step by step instructions. This project is well worth the time and money spent on material and building and can help you save a ton of money instead of buying a new solid wood outdoor sectional sofa.
You don’t have to be a professional in woodworking to build this amazing modern outdoor patio furniture set. These plans work great for beginners and intermediate level woodworkers.
2×4 have been around for a long time in the USA. Yu can also reuse material from old fences or old houses. Material that is saved from being thrown out is not only great for the environment but also has an amazing, rustic, farmhouse, aged look! Reusing wood also makes the DIY patio sectional sofa so much cheaper to build as well.
What are the specs of this patio sectional design?
The entire backyard sectional DIY sofa is made from 2x4s. This makes it cost efficient and easier to build. The sectional is actually 3 separate sofas that can be moved away from each other if needed. The two end benches are designed for 3 cushions and have both armrests on them. The central bench is for 3 cushions and has no arm rest. The build for all 3 benches is pretty much the same with only a few changes. This is great because it makes the build easier if you’re a newbie to woodworking and don’t have much experience.
The sofa uses 24 inch x 24 inch base cushions. The back rest cushions are 24 inches x 18 inches. Cushions can be purchased from stores like Home Depot, Lowes, Target, or made. If you have cushions that are slightly different in size, they should still work well with the design because of the large size of the benches and the flexibility of the cushions.
Pillows can act as an accent piece to make you patio sectional really stand out. Great outdoor pillows can be purchased on the Home Depot online website. They have a huge selection with beautiful designs.
What about other furniture pieces in the photos?
Time to build
12 hours
Total cost of build
$300 (cushions and pillows not included in cost estimate)
Skill level required
beginner-Intermediate
Download the PDF plans
Outdoor wood sectional U-shaped patio bench set PDF
What is included in the PDF download?
- Easy to read step by step instructions
- Material list
- Cut list
- Tools needed
- Links to materials/tools needed for the build
Recommend tools for this project
- Miter saw
- Drill
- Impact driver with bit for screws
- GRIP Clamps
- Sander
- wood countersink drill bit
- will need 30-40 lbs of 2.5-in screws (highly recommend T25 Star Drive screws)
- pencil
- Wood glue
- sand paper
- Pipe clamp grip, tie downs, or straps.
Disclosure: Some of these links are affiliate links.
Cut list and material list
Available with purchase of PDF plans.
Step by step instruction on building the two side arms of the "U" shaped sectional.
Step 1 DIY patio bench frame assembly (side benches of "U" shape)
Gather two of the 72-in pieces and four of the 22.5-in pieces. Lay them out as shown in the diagram. Space out the pieces as shown below. It is recommended to predrill the wood prior to putting in a screw to prevent the wood from splitting. What works for me is to us a wood countersink drill bit.
Apply wood glue to all surfaces that will be joined together. Too much dry glue can be difficult to sand off and does not stain well.
Step 2 DIY patio bench armrest assembly (side benches of "U" shape)
Next, take two 27-1/2 inch 2×4 lumber pieces and two 22-1/2 inch 2×4 lumber pieces and arrange them as shown below. Add glue, predrill holes, and add 2.5 inch screws.
Step 3 DIY patio bench armrest assembly continued (side benches of "U" shape)
Next, add a 22-1/2 inch 2×4 lumber pieces to the arm rest. It needs to be indented by 1.5 inches. I use a spacer from 2×4 lumber scrap wood for this step since the 2×4 is 1.5 inches thick.
As before, add glue, predrill, and add 2.5 inch screws.
Next, make a second arm rest identical to the one you just made for a total of two arm rests.
Step 4 DIY patio bench armrest assembly continued (side benches of "U" shape)
Next, add 27 inch long 2×4 lumber pieces to both of the arm rests.
BE CAREFUL! Make sure that the 27 inch long 2×4 pieces are places in a mirrored fashion to eachother. This is indicated by the red arrows in the diagram.
Once you ensure the proper placement of the 27 inch 2×4 lumber pieces then as before, add glue, predrill, and add screws.
Step 5 Attaching arm rests to main frame of bench (side benches of "U" shape)
Next, set the frame up right on top of one of the armrests.
In this step make sure that glue is applied to the areas that will make contact. Get help to balance the frame. Secure the frame with clamps for stability and a more solid joint.
As before, predrill and add screws.
Add both vertical and diagonal screws as shown below for a secure joint.
Repeat this for the other arm rest as well.
Step 6 Adding backrest to DIY patio bench (side benches of "U" shape)
Next, add a 72 inch 2×4 lumber pieces across the back of the bench for the back rest.
Secure the lumber piece with either a tie-down/ratchet strap, or a pipe clamp (Both options displayed below)
As before, add glue, predrill, and add the diagonal screws to secure the joint.
Step 7 Adding backrest to DIY patio bench continued (side benches of "U" shape)
Next, add a 72-inch 2×4 lumber pieces to the back rest ad shown below. Add glue, predrill, and add 2.5 inch screws.
Step 8 Adding decking pieces to DIY patio bench (side benches of "U" shape)
Next, add six 72 inch 2×4 lumber pieces to make the seating platform of the bench.
Space them out about 7/8 inches apart.
As before, add glue, predrill, and add 2.5 inch screws.
Step 9 finishing touches (side benches of "U" shape)
Next, sand down the whole bench. This can be time consuming. I use an orbital sander to speed up the process
I use a rough 80 grit paper first and then finish it with a 220 grit paper.
Filling in the holes is optional.
Build a second patio bench just like this one for the second arm of the “U” shape sectional.
Step by step instruction on building the middle bench of the "U" shaped sectional.
Step 1: Bench frame assembly (middle bench of "U" shape)
First, take two 65 inch pieces and four 22.5 inch pieces and attach them together to create the bench frame. As before, predrill, add glue, and add screws.
Step 2: Arm rest assembly (middle bench of "U" shape)
Next, assemble the sides of the bench.
Take a 12-1/2 inch 2×4 lumber piece, a 22-1/2 inch 2×4 lumber piece, and a 27-1/2 inch 2×4 lumber piece and arrange them as shown below.
Make sure that they are spaces out correctly. Once in place, add glue, predrill, and add 2.5 inch screws.
Next, add a 24 inch 2×4 lumber piece to complete on of the sides of the bench.
Step 3: Arm rest assembly continued (middle bench of "U" shape)
Next, make the second side the same way EXCEPT, the 22.5 inch piece is going to be placed on the opposite side. See image below.
The idea is to have two legs that will mirror each other.
Step 4: Attaching frame to arm rest (middle bench of "U" shape)
In this step put the frame up vertically on top of the arm rest you just assembled. Apply glue in all areas where the 2 pieces will make contact. Grips are a great way to bring the 2 pieces together and hold them securely as you screw in the screws.
This can be dangerous if doing it by yourself. Get help if needed.
Predrill holes, add screws and secure together.
Step 5: Attaching arm rest to frame continued (middle bench of "U" shape)
Repeat this same process on the other side. It might be tricky to balance these so get help. Glue, predrill, drill, and insert screws. Make sure you insert the diagonal screws for extra strength and support as shown in the diagram.
Step 6: attaching back rest (middle bench of "U" shape)
Next put in a 65-in pieces across the back. As before, a bar clamp can be very helpful. If one is not available then use a ratchet strap or tie down. Glue, predrill, and apply screws in diagonally.
Step 7: Attaching back rest continued (middle bench of "U" shape)
Put in a 72-in pieces across the top. Indent 1.5 inches as shown in the diagram for correct placement and alignment. Apply glue across the entire piece underneath. Predrill and add screws.
Step 8: Adding decking pieces (middle bench of "U" shape)
Next, add six 65 inch 2×4 lumber pieces to the bench frame to make the seating platform. Secure the pieces with glue, predrilling, and 2.5 inch screws.
Space out the decking pieces by 7/8 inches.
Step 9: Adding finishing touches to bench (middle bench of "U" shape)
Sanded down the sofa. I use a 80 grit paper for my orbital sander to help take away all major imperfections and then I follow up with a fine grit 220+ afterwards to have it be ready to be stained or painted.
Putting it all together
The three benches will come together to for the U-shaped sectional sofa. Once painted or stained, just add cushions and the sofa is ready to be enjoyed!
I highly recommend having a sofa cover for these during the wintertime. This helps protect the wood and helps it to look great for many years. If you have a roof that covers the set, I would still buy a sofa cover because moisture and dew can settle on the wood regardless. I also take off the cushions and pillows and put them away into storage during the winter as well.
The set works great around a fire fit or coffee table and make a space feel so much more comfortable and enjoyable.
