Windows, doors and glazing
What should you ask if a glazing bead is loose but the sealed unit has not misted?
Ask about the bead that holds the unit, not about the seal between the panes. A loose, split or missing bead can let the glass move and let rain towards the rebate while the unit is still clear, and clear glass means a failed edge seal was not seen. A home survey will not pull the bead off, and a loose bead is not a reason to call the frame rotten or the rebate dry.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
Beads are the strips, timber or plastic, that clamp the unit in the frame. When they fall off or shrink, the unit is one knock from moving, but the spacer bar may still be sealed and the view still clear. Mist, by contrast, is inside the panes. Keep the two findings apart so a glazier does not replace glass that is clear, and so they do not ignore a bead that has already left a gap. The survey sees the bead from the room or from outside. It does not dismantle it.
Refitting or replacing beads is a small glazing job unless the rebate behind them is wet and soft. The survey has not opened that rebate. There is no standard price. Do not replace the frame because a bead is loose, and do not ignore a missing bottom bead because the unit has not misted yet. Water often enters at the bottom bead first. Ask which windows and which edge. A firm uPVC frame with one loose bead is still a firm frame.
What should you ask your surveyor?
- Which beads are loose or missing, and on which edge?
- Is the unit clear or misted?
- Did you see into the rebate, or only the bead?
What are the typical next steps?
- Ask a glazier to refit the bead and to say if the rebate is wet.
- Do not order a new unit solely because a bead is loose.
- Do not pry beads off during a viewing.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
Is external silicone a substitute for a bead?
Sealant is not a bead. If someone has smeared over a missing bead, the holding detail may still be gone. Say what was seen.
Does a loose bead fail the locks?
No. Locks are a different check, and the survey does not test them as a security specialist.