JCT Clause 6.5.1 (historically Clause 21.2.1) is a specialist project insurance policy taken out in the joint names of the Employer and Contractor. It covers damage to neighbouring property caused by collapse, subsidence, heave, vibration, or removal of support where neither party was legally negligent.
Every independent tradesperson knows that construction sites carry inherent risks. When you’re working on groundwork, piling, demolition, or basement extensions attached to existing buildings, an unexpected ground movement can trigger catastrophic financial consequences.
If you don’t understand how non-negligence policy cover works under standard Joint Contracts Tribunal frameworks, you risk absorbing devastating liabilities.
I built my platform to cut through the legal noise and give independent subcontractors a straightforward way to protect their cash flow. Below, I break down what you need to know about JCT Clause 6.5.1 Insurance, why it matters, and how you can stop exposing your livelihood to hidden risk.
Are You Being Forced to Carry Unfunded Non-Negligence Risk?
Main contractors routinely amend standard JCT subcontracts to pass down Clause 6.5.1 insurance obligations or massive policy excesses to groundworkers, demolition specialists, and fit-out trades. If you sign without checking the bespoke Schedule of Amendments, you could be liable for structural movement you didn’t cause.
Scan Your Subcontract for Insurance Traps (3 Free Scans) →Technical Authority: Understanding Non-Negligent Structural Damage
Under standard JCT frameworks (SBCSub and DBSub Clauses 6.5.1 and 6.5.2), insurance obligations are split between standard negligence and non-negligent property damage.
Clause 6.5.1 specifically requires joint-names insurance against loss or damage to surrounding property caused by:
- Collapse, subsidence, or heave
- Vibration from piling, demolition, or heavy plant
- Weakening or removal of support (underpinning, excavations)
- Lowering of groundwater (de-watering)
Crucially, this clause addresses situations where liability triggers independently of proven negligence, placing strict contractual duties on the parties to ensure proper policies are active before tools enter the site.
Plain English Translation: What Clause 6.5.1 Actually Means on Site
Think of Clause 6.5.1 as your structural safety net when working near existing buildings or neighbouring boundaries.
Standard Public Liability (PL) insurance only pays out when property damage is caused by your proven error or negligence on site. If your excavation or piling causes an adjoining building to settle without any mistake on your part, your Public Liability insurer will legally refuse the claim.
Clause 6.5.1 is the separate joint-names policy that steps in to cover accidental, fault-free movement to surrounding structures. If an unexpected settlement occurs and your contract leaves this uninsurable gap uncovered, you become directly responsible for the remediation costs.
Loss Aversion: The Hidden Financial Trap Every Subcontractor Must Avoid
The biggest danger for independent operators is assuming standard Public Liability insurance covers every site accident.
Under the legal precedent set in Gold v Patman & Fotheringham, strict liability applies for third-party non-negligent structural damage. Main contractors know this, and they routinely insert bespoke amendments to Schedule 2 shifting the full £5,000 to £15,000 policy premium and uninsurable indemnity obligations straight down to trade subbies.
If a main contractor passes this obligation to you and you fail to secure the correct Clause 6.5.1 joint-names extension, you’re directly liable for the full cost of adjoining structural repairs. That single mistake can wipe out years of hard-earned profit overnight, triggering severe revenue loss.
Complimentary Subcontract Risk Audit
Is Your Draft Subcontract Shifting Clause 6.5.1 Liabilities Onto You?
You don’t need a degree in construction law to safeguard your trade business. I built an automated diagnostic engine that checks your draft JCT subcontract in under 2 minutes for uninsurable risk transfers before you sign on the dotted line.
Frequently Asked Questions About JCT Clause 6.5.1
Does standard Public Liability cover JCT Clause 6.5.1 risks?
No. Standard Public Liability insurance requires proof of negligence to pay out. JCT Clause 6.5.1 covers non-negligent damage to neighbouring properties (such as subsidence, heave, or vibration settlement) where the works were carried out without negligence.
Who is responsible for paying the Clause 6.5.1 insurance premium?
Under standard, unamended JCT forms, Clause 6.5.1 insurance is arranged in the joint names of the Employer and Contractor. However, main contractors frequently amend Schedule 2 to shift the entire cost and procurement liability onto the subcontractor.
What trades are most exposed to Clause 6.5.1 liabilities?
Groundwork, piling, underpinning, basement excavation, and demolition subcontractors face the highest risk of non-negligent structural movement claims to adjoining properties.