Diapason is a pipe organ building and restoration workshop. We build new instruments — tracker and electro-pneumatic — for churches, concert halls, and private collectors, restore historic organs to sound and play the way their builders intended, and keep the instruments we’ve touched in tune and in good repair for as long as they’re asked to serve.
An organ is not a fixed object. Wood moves with the seasons, leather perishes on a schedule you can estimate but not avoid, and a room’s own acoustics change every time the pews are recarpeted or the heating system is replaced. We publish the real acoustic and organ-building reference material behind our own work on this site — see the pipe-length calculator, the stop-family explorer, and the temperament comparator on the home page — because an owner or a music director who understands why a stopped pipe sounds an octave lower than an open one at the same length, or why unequal temperaments were ever considered a feature rather than a flaw, is someone we’d rather be having a conversation with.
Every new instrument is designed against the room it will actually speak into, not a generic stop list. Every restoration starts with a full condition survey — action, windchest, reservoir leather, pipework — documented before a single part comes off, so the client knows exactly what a project scope does and doesn’t include before it begins.
We take on new-build instruments, historic restorations, releathering and mechanical overhaul work, and ongoing tuning & voicing service contracts for organs we’ve built or maintained for years.