Question: how much does it cost to put a window in the loft?
Answer: Material Costs: base prices for most skylights range from $250 to $500 for a fixed unit, and from $350 to $1,250 for a vented skylight. Cost of professional installation: $500 to $1,500 per skylight, or more, depending on the complexity of the roof, ease of access, and your home's location.