A limited technical approval is a support procedure, applied during the period of realization of a technical approval having been the subject of a regular request. It makes it possible to use the results already available with a view to issuing an ad hoc favourable opinion.

A distinction is made between the following situations:

• the approval process is not yet finished, but is already far enough along to allow a favourable evaluation, limited to a specific use and for a short period of time and/or for a limited scope of application.
• there is a deviation from an issued technical approval that, at least initially, is only relevant for a specific construction site. When the same deviation is applied at several construction sites, the deviation is incorporated into the approval.

A limited technical approval cannot in any case be confirmed for use in any country other than Belgium, falls under the responsibility of the Approval Operator in charge of the management of the Executive Board that approves the limited technical approval concerned, does not comprise an ATG reference and is not included in the list of valid approvals.

Given that the limited technical approval texts are not published, but delivered by the approval operator, the UBAtc publishes the bibliographic information to ensure traceability.