Curved shapes and special designs in plasterboard (arches, columns, ceilings with curves) are among the most common requests in design-minded renovations, and also among the most underestimated when quoting.
Why bending board takes longer
To bend a plasterboard sheet there are two main techniques: progressively dampening it with a perforating roller until it is flexible (gentle curves), or using specific thinner flexible board designed for tighter curves. Both techniques demand drying times or careful handling that a straight partition doesn't need.
Curved structure: more framing, more work
Framing for curved shapes must be cut and fitted piece by piece following the radius of curvature, instead of the standard straight runs of a conventional partition, which multiplies the assembly time of the structure.
How much the quote rises
As an indicative reference, a curved section or special shape can cost between 1.5 and 3 times more per m² than the equivalent straight partition, depending on the complexity of the design. It is important to visualise the design with the client before giving a price, because small changes of radius or shape can vary the execution time quite a bit.
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