Why can't a stained ceiling just be painted?
Paint hides the stain but does not dry the board, the insulation or the framing above it. The water is still in the building, and it will continue to soak the materials and to show through the paint, often in a larger patch.
Drywall that has been wet becomes soft and loses its fiber, and it cannot be dried back to its original strength. A primer and paint can seal a wet board, and that traps the moisture inside the ceiling where it can grow mold or weaken the framing.
The stain is an indicator, not the whole problem. The board that shows the stain is usually only the visible part of a wet area, and the technician checks the boards around it and the space above before any decision is made.
How much of the ceiling needs to come down?
Only the board that is soaked, sagging or stained through needs to come out, plus a margin of board around it that the readings show is wet. Dry, firm board at a distance from the stain can often stay, and the technician marks the line of the cut from the readings.
The cut is made square and along the framing, so the new board can be fixed back to the joists and the seams can be taped and finished neatly. A cut that is made at random can leave a patch that does not hold.
The removed board is recorded with its size and location, and it is photographed before it goes. The record shows the insurer, and anyone who looks at the ceiling later, how much was removed and why.
When can the ceiling be closed up again?
The ceiling is closed up after the framing and the cavity read at the dry goal set at the start. A board that is hung over a wet cavity traps moisture and can start a new stain. The readings are taken at the final check, and the record shows the date and the values.
Drywall, joint compound and paint are installed by the trade that does that work once the drying is finished. The technician hands over the readings so the trade can see that the cavity is dry before anything is closed.
A new ceiling that stains again soon after it is finished usually means the source was not fixed or the cavity was not dry. Keep the record of the source repair and the final readings in case the question comes up.
Will the stain come back after the ceiling is repaired?
It will if the water source is still active. A repaired ceiling does not stop a leak above it, so the source has to be found and fixed before the ceiling is finished. The technician records the source and the repair so the question can be answered from the record.
A roof leak needs a roofer, and a supply or drain leak needs a plumber. The ceiling repair should wait until those are done, or it will be damaged again by the same water.
Keep an eye on the ceiling for several weeks after the repair, especially after a storm. A stain that returns quickly points to a source that is still active, and it should be checked before the paint is redone.
What does ceiling water damage cost to fix?
This site does not publish prices. The cost moves with the area of ceiling that must come out, how much insulation and framing must be dried, and how the source is repaired. The scope is explained on site and approved before any work starts.
The drying and the removal are one part of the cost, and the drywall replacement and finishing are another, quoted by the trade that does the work. The source repair is a third, and it is quoted by the roofer or plumber who makes it.
Ask for the scope in writing with the area, the source and the goal listed. Compare the drying scope with other quotes, and keep the drywall and paint work as separate lines.