The above photos are showing more or less the average quality of Irish window installations.
There is mostly the mentality of "banging the windows in" still. As a result the most clients get joints around the windows, which are too tight to insulate them in the right way and window straps, which obstruct a proper installation of window sealing tapes. It´s getting even more difficult, whenever the client wants to use insulated slabs in the reveals, because the straps are blocking a straight application of the boards. The desaster ends almost every time by notching parts of the insulation out of the board, just to cover the badly applied window straps.
Please keep in mind, that we´re living in the 21st century and various appropriate fixing solutions for windows are already invented. The best window is pointless without a proper installation. To achieve good insulation and air tight values for your new build, you have to keep an eye to such details upfront.