There’s a lot more to sound proofing a home or office than simply fitting “triple glazing” (which typically isn’t as good anyway and as a statement would be considered mis-selling)
First there’s the glass, which being very rigid is extremely good at transmitting sound so most importantly we need to have different thicknesses of glass to block out a wider spectrum of sound waves, this is the entry level “Asymmetric” glazing.
After that we can start being a bit more active and add an energy absorbing interlayer, either a simple thin layer of basically plastic laminated between layers of glass or by using a dedicated sound absorbing laminate layer.
But all the fancy glass in the world won’t help if the frames are leaking air or rigidly fixed into the building and this is where the installation and attention to detail pays off. All gaskets have to be perfect and sashes have to be clamped just right while the frame has to be allowed enough room for a full depth sound deadening foam to be injected or ideally a form fitting foam strip such as Illbruck Trio is used to isolate the frame from the building.
When sound is your enemy, you need experts, not just good products