{“@context”: “https://schema.org”, “@type”: “FAQPage”, “mainEntity”: [{“@type”: “Question”, “name”: “How do I know if a crack is dangerous?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “A through-crack (visible on both sides of the wall), wider than 2 mm, or a stair-step crack starting from a window corner is potentially structural. An expert measures the width with a crack gauge and analyses the pattern to determine the cause.”}}, {“@type”: “Question”, “name”: “My cracks open in summer and close in winter: is that serious?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “This is typical of clay shrink-swell movement (RGA). The soil swells with moisture and shrinks during dry periods. This cyclical movement can progressively damage foundations. Document it with dated photos and crack-width monitoring.”}}, {“@type”: “Question”, “name”: “My insurer refuses to cover my cracks: what can I do?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “If your municipality has been officially declared a drought-related natural disaster zone, you are entitled to compensation. An independent expert can document the link between the drought and your cracks with measurements and an enforceable report.”}}, {“@type”: “Question”, “name”: “Can I fill in a crack myself?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Not before identifying the cause. Filling it in hides the problem without solving it. If the crack is still active, it will reopen. An expert first determines whether the crack is active or old, structural or cosmetic, then advises you accordingly.”}}]}
Buying Into a Co-Owned Inheritance With Cracks: The Trap
You’re buying out a share of an inherited property and the estate agent tells you the cracks are “purely cosmetic”? Be careful. In a co-owned estate, the notary relies on a valuation – if that valuation doesn’t account for structural defects, you’ll overpay for a property that will be expensive to repair.
Why an Estate Agent’s Opinion Isn’t Enough
An estate agent is a transaction professional, not a building pathology expert. They have neither the skills nor the tools to assess how serious a crack really is:
- A 2 mm crack in a corner could be simple render shrinkage – or a sign of foundation settlement
- A horizontal crack at the base of a wall may indicate soil pressure against the structure
- A network of stair-step cracks often signals a structural problem
Only an independent building expert can determine the cause, the severity, and the cost of repairs.
What Cassini Expertise Does
We work across Nice to diagnose cracks BEFORE you sign:
- Full visual inspection: every façade, inside and out
- Crack-width monitoring if needed (gauges installed over 3 months)
- Root-cause analysis: clay soil, settlement, shrink-swell movement, construction defect
- Costed report: estimated repair costs, enforceable in negotiations
- Energy rating (DPE) support: if the energy diagnosis is inaccurate, we document it
How to Use the Report
Your expert report becomes your negotiating leverage: either the price drops by the cost of repairs, or you walk away with full knowledge of the risks. In a co-owned estate, it can also be used to reassess each party’s share.
Our Advice: Involve a Construction Law Lawyer
Buying into a co-owned estate has its own rules (right of partition, equalisation payment, capital gains). A lawyer focused on construction and inheritance law will help structure the deal while we provide the technical evidence. This combined approach protects your interests on both fronts: legal and technical.
FAQ
The estate agent is downplaying the cracks – are they right?
They don’t have the expertise to judge. An independent survey is the only way to know whether the cracks are superficial or structural.
How much does a pre-purchase crack survey cost?
Between €600 and €1,500 depending on complexity. That’s a small price compared to the potential savings on the purchase price.
Can I renegotiate the price after the survey?
Yes. The expert report is objective evidence for negotiating – or for walking away if the property is too damaged.
Can the energy rating (DPE) be challenged?
Yes, an inaccurate DPE can be disputed. Our report documents the technical elements that confirm or disprove the DPE.
Cassini Expertise – Independent building expert, Nice and across the Alpes-Maritimes. ☎ 04 22 46 06 04.
📅 Updated on 24/08/2026 – By Cassini Expertise, independent building expert covering the Alpes-Maritimes & Var. ☎ 04 22 46 06 04.
Read more:
Frequently Asked Questions
Who pays for crack repairs in a co-owned property?
Repair costs for shared areas, including structural cracks, are split between the co-owners according to their share of ownership. If the cracks affect a privately owned part, that owner is solely responsible. A prior expert survey helps determine the nature of the damage and who is liable.
Can you buy into a co-owned property that has cracks?
Yes, but it’s essential to have a survey carried out before the purchase to assess how serious the cracks are and what repairs will cost. The survey lets you negotiate the price or require repairs before the sale goes through. Without a survey, you risk taking on unexpected costs.
What does a pre-purchase survey involve for a cracked property in a co-owned estate?
A building expert examines the cracks, identifies their cause (structural, shrinkage, etc.) and produces a report with recommendations. They also assess the impact on the property’s value. The survey should be carried out before the deed of sale is signed so it can be relied upon.
Survey carried out by Frédéric Faucouneau, independent building expert – Antibes, Alpes-Maritimes (06), Var (83), Bouches-du-Rhône (13). Find out more
📅 Last updated 02/11/2026 - Cassini Expertise, independent building expert – departments 06, 83 and 13.