Occasionally, work which has been done by the contractor needs to be opened up for testing or inspection. If this is necessary it will be ordered by your architect.
It is possible that during the construction phase of your project, the architect may ask for some part of the work to be opened up. For example, if the architect suspects that a damp course hasn’t been installed or that bricks are not being properly laid, they will ask the contractor to take some of the work down. However opening and testing may be expensive and time consuming, and generally your architect will seek your instructions before issuing an order to the contractor.