Home / Flat Roof Windows / Base Unit Base Unit Sort Sort by:Most popularWhat's newPrice low to highPrice high to lowName A to ZName Z to A Showing 2 of 2 Products Base Unit Showing products 1 to 2 of 2 Sort by:Most popularWhat's newPrice low to highPrice high to lowName A to ZName Z to A VELUX Electrically operated base unit flat roof window From: £699.99 VELUX Fixed base unit flat roof window From: £284.99