Specifying Custom Sectionals: A Technical Guide for Designers
Custom sectionals offer flexibility standard configurations can't match, but specifying them correctly requires understanding terminology, construction options, and measurement conventions.
Configuration Terminology
LAF/RAF: Left Arm Facing / Right Arm Facing—describes which end has the arm when viewing the piece from the front.
Return: The shorter section of an L-shaped sectional perpendicular to the main sofa section.
Bumper: An armless end piece, typically used to create floating arrangements.
Chaise: An extended seat section for reclining, either as a return or end piece.
Armless: Connecting pieces in larger configurations, no arms on either end.
Measurement Specifications
When specifying custom dimensions:
- Overall dimensions include arms and back projection
- Seat depth measures from front of seat cushion to back cushion face
- Inside width measures between arms (sitting area)
- Arm height measures from floor or from seat deck—clarify which
Always confirm measurement conventions with your manufacturer. Assumptions cause problems.
Planning for Installation
Delivery access: Large sectionals may not fit through doorways assembled. Specify connection method (attached legs that remove, sectioned frames that bolt together).
Connection hardware: Quality sectionals include connectors keeping pieces aligned. Confirm what's provided.
Template option: For complex spaces, some manufacturers work from room templates rather than linear dimensions.
Common Specification Errors
Avoid these mistakes:
- Forgetting to specify return depth separately from sofa section depth
- Omitting arm style for return sections
- Assuming symmetrical cushioning on asymmetrical configurations
- Not confirming whether dimensions include or exclude trim details