Wall ties and cavity insulation
What should you ask if regular horizontal cracks are only on one elevation?
Ask whether that elevation is the one the surveyor thinks may have tie problems, and do not spread the comment to walls that were not described. Wall-tie corrosion often shows as cracks in fairly even brick courses. One elevation can be worse because of age, exposure or the ties used there. A home survey has not borescoped the cavity unless it says so.
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 other walls still exist. A fair face on the road side does not prove the gable. Equally, a cracked gable does not prove every wall needs new ties. The Energy Saving Trust says the wall should be sound before a cavity is filled. That is not a finding that this gable has failed. The Property Care Association’s structural pages are about investigating, not about a price per elevation.
A specialist tie inspection looks in the cavity. The home survey looks at the face and says what that suggests. If only one side is cracked, give the specialist that side and ask them whether the others need opening too. There is no national tie price. Do not fill the cavity on the cracked side to hide the joints.
What should you ask your surveyor?
- Which elevations have the regular cracks, and which do not?
- Are you recommending a tie inspection, or have you already done one?
- Is this pattern different from subsidence cracks on the same wall?
What are the typical next steps?
- Photograph the cracked elevation and a sound one, so the contrast is clear.
- Do not commission cavity insulation on the cracked wall until the ties are understood.
- Ask a tie specialist what they need to see. Do not hand them a whole-house rebuild brief.
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
Can one wall have both tie cracks and a subsidence crack?
Yes. The patterns differ. The survey should not use one sentence for both.
Does render on the other walls mean those ties are fine?
No. Render can hide the brick courses. The survey should say if it could not see them.