On the third floor, the stripped old doors are re-hung, new trim is installed, and the windows are carefully outfitted with 100-year-old carpentry work that has been saved.

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? The first step in installing attractive wood trim is marking its length accurately.

Question: I need to install doors at my house. But I’ve never done it. A friend told me to make the rough opening for the door and frame larger than the actual door-frame dimensions. This seems odd to ...