The short answer

A stair width alone cannot settle a turn. The landing has to give the delivery crew room to rotate and tilt the largest rigid piece while clearing railings and the ceiling.

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Record the full staircase

Measure clear width between the handrail and opposite wall, the narrowest tread area, overhead height at the lowest point and the usable length and width of each landing. Include the entrance door and any turn immediately before or after the stairs.

Measure what arrives

Ask the seller for packaged dimensions, dimensions of the largest rigid module and any manufacturer-approved removable parts. A sectional may travel as several pieces, but a single long chaise or arm section can still be the bottleneck.

Photograph the turn

Take wide photos from below and above each landing. Include fixed railings, light fixtures, fire equipment and door closers. Send the measurements and model number to the retailer’s delivery team and ask for their assessment in writing before ordering.

Have a fallback

Check the failed-delivery and return terms before purchase. If the crew cannot safely complete the turn, do not pressure them to force the item past a railing or fixture. Consider a smaller rigid piece or an assembly-in-room model.

Check your own measurements

Room placement and delivery are separate checks. Confirm the route with the seller when it is tight.

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