What nail fin means
A nail fin is the flange around a new construction window that is nailed to the sheathing and lapped with flashing tape and house wrap.
Also called nailing flange, new construction window.
Where it matters on a window and door job
Nail fin windows need the siding opened up, which turns a window swap into a bigger job. Quote insert or block frame windows when the siding stays, and explain the tradeoff.
What it costs
Koira's window replacement cost guide puts a typical job at $750, with most between $350 to $1,100. The guide shows its sources and what moves the price. The window replacement cost calculator prices a job line by line.
Work it out
- Free calculator: Window replacement cost calculator
- Cost guide: Window replacement cost
- Tools, templates and guides: Free window and door resources