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

Cleaning and Overhaul Category

This category covers the skills and workshop facilities necessary for periodic overhaul without major alteration, including overhauling of soundboards, releathering of bellows, routine pipe repair and so on. Whilst some members may be ready to include minor tonal or other changes in such an operation, work in this category may share the criteria that form part of the philosophy of the Historic Restoration category, such as non-intrusive repair and renewal of perishable materials on a like-for-like basis.

It is understood that accreditation in this category requires that the skills identified within the Tuning and Maintenance category are in evidence.


There are four 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

Tuning and Speech
Accuracy of bearings
Tuning of flue-work
Speech and regulation of flue-work
Tuning of reeds
Speech and regulation of reeds

At the Console
Appearance of console
All notes working promptly and correctly
Condition of keys and key-touch regulation
Key-touch response
Quietness of action
Inter-manual coupler regulation
Pedal coupler regulation
Absence of runnings and stiff slides
Stop control operation
Combination control operation
Swellbox operation

Instrument Interior
General cleanliness
Condition of bellows and control valve
Condition of trackers, buttons and wires
Condition of pneumatic tubing and leatherwork
Condition of electric components and wiring
Physical condition of pipes and any pipe repairs
Pipework staying and support
Tidiness of pipe-tops, tuners and stoppers etc.
General impression of care for the instrument