When remortgaging a property, many homeowners are surprised to receive a letter from their lender requesting specialist reports before funds are released. One of the most common requirements we see at CavClear is a wall tie survey.
If your lender has raised concerns about “cavity wall tie failure,” you are not alone.
Why Do Lenders Request Wall Tie Surveys?
During a valuation or survey, signs such as step-cracking in brickwork, movement in external walls, or previous structural repairs can raise red flags. Because wall ties are hidden within cavity walls, surveyors cannot fully assess their condition without a specialist inspection.
For lenders, this is about risk.
Wall ties are structural components that connect the inner and outer leaves of a cavity wall. If they have corroded and begun to fail, the stability of the external brickwork can be compromised. While failure is rarely sudden, progressive corrosion can affect the long-term integrity and value of the property.
Before approving a mortgage or remortgage, lenders often require:
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A detailed wall tie report from a specialist
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Confirmation of the condition of existing ties
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Recommendations for remedial works (if required)
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A long-term guarantee upon completion of works
This protects both the homeowner and the lender.
What Causes Wall Tie Failure?
In older properties, wall ties were commonly manufactured from mild steel. Over time, exposure to moisture, particularly in properties with damp cavity wall insulation, can cause these ties to corrode.
As steel rusts, it expands. This expansion places pressure on the surrounding mortar joints, often leading to horizontal or stepped cracking in the brickwork. Because this process happens inside the cavity, visible cracking is often the first external sign that something may be wrong.
What Does a Wall Tie Survey Involve?
A professional wall tie survey is not just a visual inspection of cracking. It involves specialist equipment to access and inspect the cavity.
At CavClear, our surveys typically include:
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External assessment of cracking and movement
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Cavity inspection using specialist cameras
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Assessment of wall tie type, spacing and condition
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Moisture considerations within the cavity
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A clear written report with recommendations
If wall tie corrosion is confirmed, we provide a structured remedial plan, including isolation of original ties and installation of stainless-steel replacements designed for long-term durability.
Why Acting Quickly Matters During Remortgaging
Mortgage timelines are often tight, and delays in providing specialist reports can slow down approval or the release of funds. By arranging a wall tie survey promptly, homeowners can ensure the correct documentation is supplied to their lender, avoid unnecessary hold-ups, and address any structural concerns early. Where remedial work is required, securing long-term guarantees provides additional reassurance for both the homeowner and the lender. In many cases, once the necessary works are completed and certification is issued, lenders are satisfied and the remortgage can proceed without further complications.
At CavClear, we regularly carry out wall tie surveys for mortgage and remortgage purposes. Our reports are clear, detailed and structured to meet lender requirements, helping homeowners move forward with confidence.
If your bank or surveyor has recommended a wall tie specialist report, we’re here to help. Contact us, here, to make an enquiry or book a wall tie survey.
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