Yes, but with a caveat. Many mainstream urban outdoor furniture brands do not offer fully bespoke one-off pieces, yet quite a few offer configurable modular systems that can be combined to fit awkward balcony shapes. A smaller group of specialist made-to-measure outdoor furniture companies will work to your exact dimensions.
If your balcony is triangular, narrow, L-shaped, curved, or has sloping walls, the easiest place to start is with modular seating. Brands known for modular or configurable outdoor collections include Kettal, Roda, Dedon, Gloster, and Manutti, though availability and customization options vary by dealer and region. Always ask whether dimensions can be adjusted, whether corner and wedge modules can be added, and whether cushions can be made to fit the final layout.
Custom cushions and bench bases are usually the most practical solution for odd-shaped balconies. A local outdoor upholsterer or specialist balcony furniture maker can work from a cardboard template or detailed sketch and produce weather-resistant cushions, bench seats, and covers. For hard pieces such as tables, custom fabrication is less common from big brands, but local metalworkers or joiners can often create powder-coated aluminum, teak, or HPL pieces to fit.
When requesting custom sizes, ask about lead times, weatherproof materials, drainage, warranty on custom items, delivery access, and return policies. Measure carefully at floor level and rail height, note door swings and drainage points, and make a template for curves or angles. Allow a little clearance so the furniture does not feel wedged in.
So the short answer is yes: some urban outdoor furniture brands and specialists do offer custom or configurable sizes for odd-shaped balconies, especially through modular ranges and made-to-measure cushions. Expect longer lead times and higher costs than standard sizes, but the fit is usually worth it.