Chimneys and parapets
Can a television aerial fixed to a chimney crack the mortar?
Yes. A mast and brackets add leverage in the wind, and rusty straps can burst the mortar joints they grip. A surveyor can often see the straps, a slight lean, or cracked joints. They cannot load-test the mast.
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?
The defect may be the fixing, not the flue. Removing an unused aerial is sometimes the whole repair. Sometimes the stack was already weak and the aerial is only the latest load. The report should say what was visible. It will not say the aerial is electrically safe or that the cable entry through the roof is weathered. Look for that entry as a separate hole.
Ask the surveyor whether they could see movement at the straps or only the presence of an aerial. A roofer or steeplejack quotes for access. Do not climb a stack to see for yourself. If the aerial is shared on a terrace, ask the solicitor before anyone unbolts it. Shared metalwork is not yours just because it appears in your photographs.
What should you ask your surveyor?
- Are the straps biting into open joints, or merely fixed to sound brickwork?
- Is the stack leaning, or only carrying an aerial?
- Does the cable pierce the covering, and did you see that hole?
What are the typical next steps?
- Do not treat every aerial as a stack failure. Ask what the joints looked like.
- If the aerial is redundant, get a quote to remove it safely rather than a quote to rebuild the stack.
- Check the cable entry. A sound stack can still leak at a hole through the felt.
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 a satellite dish on a stack the same issue?
It is another fitting that can lever the mortar. The dish itself is not a flue defect. The brackets and the cable are the questions.
Will the surveyor remove the aerial?
No. The inspection records it. Removal is a separate instruction with safe access.