Marvin Architectural have a showroom in Dunlavin, Co. Wicklow. Pretty expensive windows but beautiful. Check out their website first as they may not be what you want. I was quoted for 26 windows (3 large, rest med)and 3 french doors 35k. That was for timber sliding sash. Price incl VAT and supply and fit. Service was great up to quote but we decided not to go with them as price was above our budget. Shame though, gorgeous windows.