Wall ties and cavity insulation
What should you ask a lender if the report suspects wall-tie failure?
Ask the lender what evidence they want, and ask them before you pay for the most expensive investigation you can find. Many lenders want a specialist report when ties are suspected. The survey does not decide the lending. The lender does.
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?
A condition rating is not a mortgage offer. The surveyor may recommend a specialist. The lender may ask for that report, for a retention, or for nothing beyond the valuation they already have. You will not know which until you, or your broker, asks. Do not guess from another buyer’s story.
Send the lender the relevant page, not a paraphrase that upgrades “possible” into “failed”. Ask the specialist, if one is required, to answer the lender’s question in the format they asked for. Fees for that report vary. The specialist should tell you the fee before they drill. A retention, if the lender later holds one, is their money mechanism, not a repair quote.
What should you ask your surveyor?
- What exact words did you use: suspected, possible, or seen?
- What specialist report would you consider enough to answer the question you raised?
- Did you see a bulge or cracking, or only an age of building?
What are the typical next steps?
- Tell the broker or lender the wording early. A surprise at offer stage helps no one.
- Commission only the investigation the lender or the surveyor has actually asked for.
- Do not start tie replacement to “keep the lender happy” before they have said what they need.
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
Will every lender refuse a house with replacement ties?
Do not claim that. Lenders set their own criteria. Some want the guarantee for work already done. Ask this lender.
Is a retention the cost of the ties?
No. A retention is money the lender holds back from the mortgage. It is not a builder’s price, and it is not paid to you as cash to spend as you like. Ask the lender how theirs works.