We read contractor quotes closely. These are the write-ups: one project type at a time, what a complete bid covers, what the cheap one usually leaves out, and which line item is really driving the difference between two numbers.

• Roofing

  Two roof quotes, six thousand apart, both honest

  Tear-off or lay-over, how much deck replacement is budgeted, and where the ice-and-water shield stops. Three lines that explain most of the gap.

  7 min

• Furnace replacement

  The furnace bid that didn't mention the chimney

  Going from an old mid-efficiency unit to a 96% condensing furnace changes how the house vents. If the quote is silent on it, someone is paying for it later.

  6 min

• Windows

  Insert or full frame, multiplied by fourteen

  Two installers can quote "window replacement" and mean genuinely different jobs. Here's how to tell which one you're being priced for.

  8 min

• Sewer line

  Nobody can price a pipe they haven't looked inside

  Spot repair, pipe lining and full replacement sit thousands apart, and a camera scope is the only thing that decides between them. Treat a quote without one as a guess.

  6 min