The IBO Register of Accredited Business Members

The most accurate and up-to-date information for those requiring the work of an accredited organ builder

New Organ Construction Category

This category refers to instruments that have at least been designed and largely manufactured by the applicant, though they may include some bought-in parts. Some new organs may include older casework or a small proportion of other materials from an earlier instrument.


There are five main sections required to be inspected to succeed in this category. The significance of the details within each is that, while examples of workmanship may have been witnessed over and above, in every case these items will have been inspected as a minimum requirement within this category.

The Workshop
Appropriate facilities for new organ work to be carried out

Quality of design
Timber selection
Timber surface finish
Moulding and carving/fretting finish
Front pipe appearance and finish

Tuning and Speech
Accuracy of bearings
Tuning of flue-work
Speech and regulation of flue-work
Tuning of reeds
Speech and regulation of reeds
Balancing of choruses (i.e. an even build up through addition of upperwork and sensible ration of power between manual divisions)
Power balance in the building (i.e. whether the instrument is either overpowering or, on the other hand, inadequate to support hearty singing)

At the Console
Appearance of console
Quality of cabinetwork
Manual key and pedal finish
Stop control and engraving finish
All notes working promptly and correctly
Key-touch evenness
Quietness of action
Intemanual coupler regulation
Pedal coupler regulation
Stop control operation
Combination control operation
Swellbox operation
Wind steadiness
Adequacy of wind for full organ
Tremulant operation
Blower quietness

Instrument Interior
General cleanliness
Soundboard/windchest design and finish
Design to withstand humidity change
Internal layout design for tonal output
Accessibility for tuning and maintenance
Building frame
Bellows and wind-trunk design and finish
Key action construction and finish
Stop action construction and finish
Swellbox construction and effectiveness
Tidiness of conveyancing
Quality of pipe manufacture
Pipework staying and support
Condition of front pipe tuners
General impression of interior finish