If the building is protected, changes in appearance and choice of materials must be made in consultation with the authorities/organisations concerned. Some brands of seamless acoustic ceilings have wide customization options, which increases the opportunity for finding an approved solution. Often, a physical sample is needed as a reference when developing a customer-specific surface texture. Photos are of course helpful, but are usually not enough. We also recommend that you construct a test installation so that you can ensure that the solution meets the set requirements, something which can often be difficult to determine simply by looking at a small separate sample.