SÖDERHAMN One-seat section assembly
Assembly instructions for the IKEA SÖDERHAMN one-seat section, including hardware identification, step-by-step assembly, and modular connection guide.
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Jump to the sectionProduct Overview
The SÖDERHAMN one-seat section is a modular furniture piece designed for comfort and flexibility. This manual provides the necessary steps to assemble the base frame and prepare it for use or connection with other SÖDERHAMN modules. The design emphasizes a sturdy metal frame construction that requires careful assembly to ensure long-term stability.

Safety and Preparation
Before beginning the assembly, ensure you have a clear, clean workspace. It is recommended to assemble the furniture on a soft surface, such as a rug, to prevent damage to the frame or your floor. Always check that all parts listed in the hardware section are present before starting. If you are unsure about any step, contact IKEA support for assistance. Do not force parts together, as this may cause damage to the components.
Assembly Process
The assembly process involves attaching the support legs and structural bolts to the main frame. You will need to use the provided specialized tools to tighten the bolts securely. Follow the numbered steps in the manual sequentially. Pay close attention to the orientation of the frame and the placement of washers and nuts. Once the primary frame is assembled, you may proceed to attach the upholstery or connect the section to other modules if you are building a larger sofa configuration.
Modular Connection
The SÖDERHAMN system is designed to be modular. If you are connecting multiple sections, use the provided metal brackets and hardware to securely join the frames together. Ensure that the sections are aligned correctly before tightening the connection hardware. This ensures a seamless look and prevents the sections from shifting during use.

Maintenance and Care
To keep your SÖDERHAMN section in good condition, periodically check that all bolts and connections remain tight. Over time, regular use may cause hardware to loosen slightly. If you notice any instability, re-tighten the connections using the original tools. Keep the frame clean and dry, and avoid placing excessive weight on individual components beyond their intended use.
Manufacturer information
IKEA
Practical help
Common problems
Ensure all bolts and nuts are fully tightened using the provided tools. Check that the floor is level.
Loosen the connection brackets slightly, align the sections perfectly, and then re-tighten all hardware.
Before use
- Clear a large, clean area for assembly.
- Use a rug or soft surface to protect the frame.
- Verify all hardware components against the parts list.
- Ensure you have the required tools (awl and pencil mentioned for specific steps).
- Check that all bolts are tightened securely.
Images and diagrams
- The manual uses clear illustrations to show the placement of bolts, washers, and nuts.
- Arrows indicate the direction of rotation for tightening hardware.
- Specific icons show when two people are required for assembly.
- Detailed views show how to connect multiple sofa sections using metal brackets.
Model compatibility
- Designed specifically for the SÖDERHAMN modular sofa series.
- Can be connected to other SÖDERHAMN sections using the included bracket system.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.