Suncatcher Cottage is a domestic extension in Purley, Croydon, designed by Francesco Pierazzi Architects for a family of 4. The project is organized as 2 distinct sub-briefs, each producing a separate building that serves a different purpose and takes a different formal approach. The division is the project's central organizational idea, developed from a previous house extension project the studio completed in Surbiton.

The side extension takes a monolithic form with hollowed-out apertures. Finished in dark painted render, it aligns with the existing brick of the cottage and handles the more utilitarian parts of the brief. The back extension operates on entirely different terms. It is organized around a detailed study of the sun's path across the site, with openings of varied shapes and sizes positioned to track and capture daylight at different times of day. An architectural nacre piece is hung indoors to pick up and reflect nearby light sources. Where the side extension is closed, the back extension opens.

The back extension's form is described by the studio as pulled and stretched at its edges, producing a sculptural interior that reads differently from different positions within it. The exterior is clad in 3-dimensional textured timber boards, which cast deep shadows across the surface that emphasize the extension's relief and change in quality as the sun moves. Mature trees in the back garden are in close proximity and the building's form and its cladding are calibrated to read in dialogue with that boundary rather than against it.