Cladding Defects and Remediation: Our Quantum Expertise
SOCOTEC's quantum experts deliver independent forensic analysis for technically complex, multi-party cladding defect and remediation disputes valued under £1m to over £30m. We support early resolution through advisory reports or deliver CPR Part 35 compliant expert evidence for formal proceedings.
Introduction
Following the Grenfell Tower fire of 14 June 2017, building owners, particularly registered providers of social housing, local authorities, and private developers, have faced obligations to investigate the fire safety of their stock and, where necessary, undertake substantial remedial work. The financial exposure of these works is significant, and the recovery routes are complex, whether contractual, statutory, warranty based, or via Government-funded schemes. Our quantum expert witness team delivers independent, evidence-based forensic analysis of cost and loss-based claims to provide clarity in navigating these disputes.
Fire cladding disputes
Common defects
The defects we encounter often fall into recurring categories:
- Combustible cladding panels, including Aluminium Composite Material (ACM), High Pressure Laminate (HPL), insulated render systems, terracotta, aluminium PPC curtain walling, and thermowood.
- Combustible insulation, including polyurethane (PUR), phenolic foam, and similar products, often present in conjunction with combustible cladding.
- Missing or defective fire cavity barriers, whether omitted, breached, or installed so as not to perform their intended fire stopping function.
- Inadequate fire compartmentation, including breaches at junctions, service penetrations, and party wall conditions.
- Junction and detailing defects, including water ingress paths around windows and balconies, and defective tanking caused by incorrect external paving levels.
- Structural and physical damage defects, often discovered once external wall systems are opened up, include failures of steelwork connections and protective coatings, roof substrate failures, and damage to precast concrete planks at service penetrations.
These defects commonly amount to breaches of the Building Regulations in force at the time of construction and may also constitute physical damage covered by an NHBC Buildmark or similar new home warranty.
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Why these issues lead to dispute
The translation of a technical defect into a quantified claim is rarely straightforward. The recurring drivers of dispute are:
- Substantial cost: Across the matters we have advised on, individual project values have ranged from circa £0.5 million for a discrete remedial scheme to in excess of £30 million for a scheme covering multiple blocks. Demolition and rebuild options, where considered, run materially higher.
- Multiple parties: The original developer, principal contractor, façade subcontractor, designer, fire engineer, and product manufacturer each have their own contractual, insurance, and limitation positions. Company acquisitions, restructurings, and dissolutions in the intervening period complicate the recovery analysis further.
- Cost allocation and categorisation: Where a remedial scheme addresses multiple defects, the cost properly attributable to each defect must be identified and, where relevant, split between design defects, workmanship defects, and breaches of contract and/or the Building Regulations for warranty and statutory recovery purposes.
- Funding interactions: Government funded remediation schemes (the Building Safety Fund, the Cladding Safety Scheme, and the Developer Remediation Contract), the Schedule 8 Leaseholder Protections under the Building Safety Act 2022, and historic warranties may all interact with the analysis of quantum.
Our contribution
We are typically instructed by solicitors acting for claimants or defendants – and this frequently includes registered providers of social housing or private developers – at any stage from pre-action analysis through to formal litigation, adjudication, or arbitration. We also accept direct instructions on an advisory basis, and joint instructions where the parties agree a single quantum expert.
The work we undertake commonly takes one of four forms:
- Cost estimating an identified remedial scheme.
- Cost allocation from a completed remedial scheme, extracting the cost attributable to a defined subset of defects.
- Categorisation of cost between heads of recovery, such as workmanship defects versus Building Regulations breach.
- Demolition and rebuild estimates as comparators to remediation.
Our deliverables
Our cost analysis is grounded in comprehensive project documentation, including the Employer's Requirements, contractor design proposals, as-built drawings (where available), and technical experts' reports (FRAEW or PAS 9980 assessments, fire engineering and structural engineering reports).
We structure our analysis in accordance with the RICS New Rules of Measurement (NRM1) and measure quantities directly from technical drawings using CostX software, which produces a transparent and auditable record. Our pricing methodology uses a triangulated approach, drawing on current and historic project data, SPON's and other Price Book data, first principles estimating in accordance with the RICS Cost Prediction Professional Statement, and the MHCLG cladding remedial cost data published in December 2024. We generally rely on the Building Cost Information Service (BCIS) All in Tender Price Index to account for inflationary impacts, but recent live tender returns from comparable schemes can also inform on market sentiment. Multiple independent data sources allow each cost component to be cross-checked.
Our analysis allows us to provide advisory reports on quantum, detailed cost schedules and workbooks, marked up drawings showing the basis of measurement, cost allocation analyses (by defect or by category of recovery), triangulated benchmarking schedules, and demolition and rebuild estimates. Where formal expert evidence is required for adjudication, arbitration, or proceedings before the Court or the First Tier Tribunal, we carry this work through into an expert report compliant with Part 35 of the Civil Procedure Rules (CPR).
The statutory framework for cladding disputes is complex and continues to evolve. Key legislation includes the Building Safety Act 2022 (in particular, the extension of limitation under section 1 of the Defective Premises Act 1972, the Remediation Orders and Remediation Contribution Orders under sections 123 to 125, the Building Liability Orders under section 130, and the Schedule 8 Leaseholder Protections); NHBC Buildmark and similar warranties; the Building Regulations and Approved Document B in force at the date of construction; and the Fire Safety Act 2021. Case law continues to drive interpretation and application of this key legislation.
Delivery challenges
When preparing reports, we frequently address:
- Incomplete records/information, drawing on the available sources, clearly identifying assumptions, and stating what further evidence would change the position.
- Overlapping scopes of work, where a single area of cladding may need to be deconstructed for several reasons and a defensible allocation is required.
- Diseconomies of scale, where a discrete remedial scheme attracts higher unit rates than the same scope undertaken as part of a larger package.
- Absorption of contingency into the variation account during the works.
- Potential duplication within contractors' applications for payment, which we routinely identify and bring to our clients' attention.
Waking watch costs, decant costs, tenant compensation, and historic investigation costs are also heads of cost which we routinely analyse and opine on (both causation and quantum).
Outcomes achieved
We have helped our clients achieve a range of successful outcomes, both within and outside formal alternative dispute resolution procedures:
- Settlements reached in mediation: On schemes involving combustible cladding and missing fire cavity barriers, our advisory reports on quantum have formed the principal quantum evidence relied upon at mediation, with settlements providing for a substantial contribution to the cost of the remedial works.
- Settlements reached outside formal ADR proceedings: On schemes covering multiple blocks, our cost allocation analyses have supported negotiated settlements reached directly between the parties' solicitors in pre-action correspondence, without resort to mediation, adjudication, or arbitration. The costs properly attributable to each party for a defined subset of defects are extracted from a completed remediation account.
- Settlements where the recovery routes were mixed: On schemes involving both structural and fire safety defects, where recovery was potentially available under an NHBC Buildmark warranty, under the original construction contract, and under the Building Safety Act 2022, our categorisation of cost between physical damage and breach of the Building Regulations has supported negotiated settlements addressing the relevant warranty and contractual heads in a single resolution.
- Settlements informed by demolition and rebuild comparators: On schemes where the question arose whether demolition and rebuild was disproportionate to remediation, our parallel cost estimates, measured and benchmarked against published BCIS project analyses, have allowed the parties to reach a position on appropriate scope and cost without resorting to formal proceedings.
In each case, our analysis has provided robust quantum and cost analysis on which negotiation, mediation, or, where required, formal proceedings have been able to be progressed. Where settlements have been reached, our analysis has informed both the headline figure and the allocation of recovery between the parties.
Conclusion
Cladding related disputes are technically demanding, legally complex, and commercially significant. Our remedial work cost estimates are grounded in the project documentation available, structured in accordance with NRM1 which is universally recognised, measured transparently in CostX, and benchmarked against multiple independent cost and price data sources. Our analysis identifies the case that the evidence supports, addresses what the evidence does not support, and delivers outputs – whether advisory or CPR Part 35-compliant – that withstand scrutiny.
If you or your clients are facing a cladding- or fire safety-related dispute that requires quantum analysis, our team delivers proportionate, defensible assessments that support equitable resolution. Get in touch to discuss how we can support you.
