What you’ll build
A long run of about 82″ and a shorter return meet at a shared 4x4 corner post. 2x4 rails frame both seats, with cross rails under the 1x4 seat slats. Three 1x4 backrest slats run along each side, and 2x4 armrests cap both ends.
Shopping list
Buy these boards. The list fits every cut onto standard lengths and leaves ⅛″ for each saw cut and ¼″ for trimming board ends.
| Lumber | Length | Qty |
|---|---|---|
| 4x4 | 8 ft | 2 |
| 2x4 | 8 ft | 4 |
| 1x4 | 8 ft | 10 |
Cut list
All 36 parts, grouped so you can cut matching pieces together. Exact lengths and end-cut angles for every part are in the free plan in the TimberLab app.
| Part | Lumber | Qty |
|---|---|---|
| Seat Rail | 2x4 | 6 |
| Seat Slat | 1x4 | 5 |
| Backrest / Seat Slat | 1x4 | 4 |
| Leg | 4x4 | 3 |
| Backrest | 1x4 | 3 |
| Seat Slat | 1x4 | 3 |
| Front Leg | 4x4 | 2 |
| Armrest | 2x4 | 2 |
| Inner Leg | 4x4 | 1 |
| Rear Seat Rail | 2x4 | 1 |
| Front Seat Rail | 2x4 | 1 |
| Left Seat Rail | 2x4 | 1 |
| Outer Seat Rail | 2x4 | 1 |
| Inner Seat Rail | 2x4 | 1 |
| Front Seat Rail | 2x4 | 1 |
| Seat Slat | 1x4 | 1 |
Tools
- Tape measure
- Pencil
- Speed square
- Eye & ear protection
- Drill
- Miter saw
- Clamps
- Sander
Step-by-step instructions
Assemble Left End Frame
Lay the 34-inch left rear post and 24-inch front post flat on your work surface. Position the 12 1/2-inch transverse seat rail between them at seat height, keeping the outside faces flush. Clamp the parts firmly and check for square before proceeding.
Add Long Seat Rails and Corner Posts
Stand the 34-inch corner post and 16-inch inner corner leg upright with assistance. Fit the 75 5/8-inch long rear rail between the back posts and the 59 5/8-inch front rail between the front posts, aligning top edges flush with the left end rail.
Connect Short Run Perimeter Posts and Rails
Install Long Bench Cross Rails
Install Short Bench Cross and Corner Rails
Install Long Backrest Slats
Install Short Backrest Slats
Position Left and Right Armrests
Lay Long Seat Slats
Lay Short Seat Slats
Get the full plan: all 10 steps and every cut length.
Download TimberLab and open Outdoor corner bench in the catalog to get every cut length and end-cut angle, all 10 assembly steps in 3D, and Timbo, the AI build helper. Catalog plans are free to open; some features, such as AI edits, require a subscription.
For outdoor use, choose a rot-resistant or pressure-treated lumber (rated for ground contact where wood touches soil) and exterior-rated screws. Seal the end grain, build on level ground, and check the joints each season.
Change the size or design
This plan is one of the projects in the TimberLab app’s catalog. In the app you can turn the model in 3D, follow the assembly steps one part at a time, and ask for changes in plain words, such as “make it 6 inches shorter” or “add a shelf”. The cut list and shopping list update to match the new design.
Questions about this plan
How much lumber do I need to build this outdoor corner bench?
The shopping list calls for 2 × 4x4 at 8 ft; 4 × 2x4 at 8 ft; 10 × 1x4 at 8 ft. It groups every cut onto standard board lengths and leaves room for saw cuts and trimming the board ends.
How big is the finished outdoor corner bench?
It is 82 ⅝″ wide, 34″ tall, and 39 ½″ deep.
What tools do I need?
You need a tape measure, pencil, speed square, eye & ear protection, drill, miter saw, clamps, sander.
Can I change the size of this outdoor corner bench?
Yes. Open the outdoor corner bench in the TimberLab app and describe the change in plain words, such as “make it 6 inches shorter”. The 3D model, cut list, and shopping list update together.
Where can I get the full outdoor corner bench plan?
The full plan, with every cut length and all 10 assembly steps in 3D, is free in the TimberLab app. Download TimberLab on the App Store and open the outdoor corner bench in its catalog.
