Wall ties and cavity insulation

Does a cavity wall built in the last few decades carry the same tie risk as an early one?

Not automatically. Early cavity walls often used mild-steel ties that can rust. Later ties are often stainless or non-ferrous, which is why surveyors ask roughly when the wall was built. The survey still cannot see the metal unless it is exposed. Age is a reason to look, not a verdict.

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 failure everyone means by “wall-tie failure” is corrosion of older ferrous ties, with cracking and a bowing outer leaf. A 1990s cavity is a different prospect from a 1930s one, but a date on a deed is not a photograph of the tie. Extensions are often newer than the house. A visual survey separates what it can see — cracks, bows, new brick — from what it is inferring.

Do not tell a lender the ties have failed because the house is old, and do not skip a crack pattern because the house is new. The Energy Saving Trust’s insulation advice still depends on the cavity you have, not on the decade alone. If the report is silent, ask the surveyor whether age was considered and whether any crack is in the bed joints.

What should you ask your surveyor?

What age of wall are you talking about, including any extension?
Did you see bed-joint cracks or a bow, or only the age of the house?
Are you recommending an inspection or recording that you saw no such pattern?

What are the typical next steps?

Do not buy a tie survey for a new cavity with no cracks because a forum told you to.
Do not skip one where the outer leaf has already bowed.
Tell the lender the construction the surveyor actually described.

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 new ties be fitted badly?

Yes. Replacement ties can miss the inner leaf or bridge the cavity. That is why a guarantee and a layout matter if work was done. The survey may only see the plugs.

Does stainless steel mean the wall cannot crack?

No. The wall can still move for other reasons. The metal type only changes the rust question.