Not sure what you mean by double glazing. If it is a sealed assembly with an inner and outer pane, called thermopane or an IGU for 'insulated glass unit' replacement is best handled by a glazier.
If it is single glazing in a storm sash over the single glazed prime window, replacement isn't a terrible DIY job, as observed above.
__________________
There ain't nothin' more powerful than the odor of mendacity -Big Daddy
|