Design & Build / Turnkey Contractors Insurance

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Protect your projects and business against design liability, contract works damage, delays and construction disputes with tailored cover

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We compare quotes from leading insurers

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  • QBE
  • RSA
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DESIGN & BUILD INSURANCE THAT HELPS YOU DELIVER

Why Design & Build Insurance Matters

Design & Build and turnkey contractors take single-point responsibility for design and construction. That increases exposure to specification errors, coordination failures, workmanship defects, contract works losses, delay damages and disputes under JCT/NEC/EPC contracts. The right cover helps protect your cashflow, reputation and ability to complete projects.

Design & Build Project Protection

Cover for investigation, remediation, professional defence and project recovery following an incident, defect or dispute.


  • Professional Indemnity (Design Liability) - Protection against claims arising from design errors, omissions, specification failures and fitness-for-purpose allegations.
  • Contract Works / Contractors All Risks - Cover for damage to the works, materials, temporary works and partially completed structures on site.
  • Business Interruption / Project Delay - Financial protection where a major insured event causes delay, disruption or additional costs to complete.
  • Public Liability - Cover for injury or property damage to third parties arising from your operations.
  • Contractual & Legal Support - Assistance with defence costs, contract disputes and claim handling aligned to project requirements.

Common Risks for Design & Build Contractors


  • Design errors, omissions and coordination failures
  • Workmanship defects and rework / rectification costs
  • Fire, flood, storm and accidental damage to the works
  • Theft of materials, plant and equipment from site
  • Subcontractor failure, insolvency or poor performance
  • Delay damages (LDs) and additional costs to complete
  • Injury to third parties or damage to surrounding property
  • Disputes under JCT/NEC/EPC terms and variations

Why Choose Insure24


  • Expert Guidance - Specialists in construction, engineering and design liability risks who can align cover to your contract and scope.
  • Fast Claims - Responsive support for site incidents, defects and liability claims with practical guidance to keep projects moving.
  • Competitive Pricing - Access to a wide panel of insurers for strong terms across PI, CAR, PL/EL and project add-ons.
  • Project-Focused Support - Help meeting funder, client and main contract insurance requirements (JCT/NEC/EPC).

How to Get Design & Build Insurance


  • 1. Get a Quote - Provide details about your projects, turnover, contract forms (JCT/NEC/EPC) and design responsibilities.
  • 2. Review Coverage - We explain PI, CAR, PL/EL and project extensions, and recommend suitable limits and endorsements.
  • 3. Customise Your Policy - Tailor indemnity limits, excesses, territory/jurisdiction and contract works values to match your risk.
  • 4. Purchase & Activate - Bind cover and receive documentation to satisfy client, funder and principal contractor requirements.

Design & Build Insurance for Your Sector

Different project types carry different exposures. We tailor cover to your delivery model, scope and contract conditions.

Commercial Fit-Out & Refurbishment


  • Tenant works, dilapidations and third-party property damage
  • Working in occupied premises and business interruption exposures
  • Fire risk, hot works and temporary works management
  • Programme delay and liquidated damages
  • Design coordination (M&E, partitions, finishes) and defects risk

Residential Developments


  • Design and build liability for structural, cladding and building services
  • Latent defect exposures and post-completion claims
  • High-value claims from water ingress, fire and workmanship defects
  • Site security, theft and vandalism
  • Compliance with building control and safety requirements

Industrial, Warehousing & Logistics Builds


  • Large contract works values and materials storage exposures
  • Groundworks, drainage and subsidence risk
  • M&E coordination and commissioning risk
  • Weather impacts and delay costs
  • Damage to existing services and third-party property

Public Sector & Infrastructure Projects


  • NEC/JCT contract compliance and stringent insurance clauses
  • Traffic management, public interface and higher liability exposure
  • Environmental and pollution incidents
  • Complex stakeholder management and delay damages
  • Plant, temporary works and engineering design responsibility

Understanding Modern Construction Risks

Design & Build projects face a mix of technical, contractual and on-site hazards. Understanding the exposures helps you choose appropriate limits and extensions.

Design Errors & Specification Failures


Design liability claims can arise from errors, omissions, coordination failures or fitness-for-purpose requirements. Costs include professional defence, investigations, remedial design, rework and third-party losses. Claims can escalate quickly where defects affect structure, M&E systems or water ingress.

  • Coordination clashes and incomplete design
  • Incorrect calculations and detailing
  • Fitness-for-purpose allegations
  • Remedial works and consequential loss disputes

Defects, Rework & Latent Damage


Workmanship defects may be discovered during commissioning or after handover. Rectification can require invasive work, specialist access, temporary protection and extended programme time. Post-completion claims often involve multiple parties and complex causation.

  • Water ingress and envelope failures
  • Fire stopping and compartmentation issues
  • M&E commissioning and performance failures
  • Structural cracking and movement

Delay Damages & Additional Costs to Complete


Programme delays can trigger liquidated damages, extended prelims and cost overruns. Delays often result from supply chain issues, weather events, design changes, access constraints or rework. The right extensions can help manage the financial impact of major insured events.

  • Liquidated damages and contractual penalties
  • Extended preliminaries and site overheads
  • Acceleration and overtime costs
  • Disruption and loss/expense claims

Contractual Disputes & Liability Allocation


Design & Build contracts can transfer significant risk to the contractor, including design responsibility, indemnities and strict obligations. Disputes can involve multiple stakeholders and require specialist legal and technical input.

  • JCT/NEC/EPC contract obligations
  • Indemnities and collateral warranties
  • Subcontractor performance and back-to-back terms
  • Claims handling, expert reports and defence costs

Site Damage, Fire, Flood & Theft


Physical loss or damage to contract works can derail a project. Common causes include fire, flood, storm, escape of water, accidental damage and theft/vandalism. The right contract works cover helps with reinstatement, debris removal and protection costs.

  • Fire and hot works incidents
  • Flood, storm and weather-related damage
  • Theft of materials, plant and tools
  • Accidental damage and collapse

Injury, Property Damage & Public Interface


Operating in live environments or near the public increases exposure to injury claims and third-party property damage. Strong liability cover supports legal defence, compensation and incident response.

  • Third-party injury claims
  • Damage to adjacent property and utilities
  • Employer’s liability for workforce injuries
  • Contractor negligence allegations

The Real Cost of Construction Incidents

A single design error or on-site loss can create major financial pressure. Understanding these costs demonstrates why specialist Design & Build insurance is essential.

Direct Financial Losses


  • Professional defence and expert reports: £5,000 - £250,000+
  • Investigation and intrusive surveys: £10,000 - £150,000
  • Rectification and rework: £25,000 - £1,000,000+
  • Reinstatement of contract works after damage: £50,000 - £5,000,000+
  • Third-party property damage and compensation: £10,000 - £2,000,000+
  • Legal costs and dispute resolution: £15,000 - £500,000+

Indirect & Hidden Costs


  • Extended preliminaries and site overheads: £2,000 - £25,000+ per week
  • Liquidated damages / delay penalties
  • Reputational damage and loss of future tenders
  • Management time and productivity loss
  • Supply chain disruption and re-procurement costs
  • Higher future insurance premiums and contract scrutiny

Real-World Impact

Design & Build claims often involve multiple parties, technical causation and high remedial costs. With the right cover in place, you can protect cashflow, satisfy contract requirements and respond quickly when something goes wrong.

Assess Your Project Risk

Understanding your risk profile helps ensure your policy limits and extensions reflect your projects, design responsibility and contract requirements.

Assessment Areas


  • Design responsibility and scope (in-house, novated, subcontracted)
  • Contract forms, warranties, indemnities and insurance clauses
  • Project values, contract works limits and peak site exposures
  • Temporary works, fire strategy and site security controls
  • Quality assurance, inspections, testing and commissioning
  • H&S management (RAMS, CDM duties, competency)
  • Supply chain strength and subcontractor vetting
  • Claims history and risk improvements

Risk Factors We Evaluate


  • Turnover and project mix
  • Max contract value and contract works sums insured
  • Nature of works (new build, fit-out, refurb, structural alterations)
  • Working in occupied premises / high public interface
  • Use of hot works and high-risk activities
  • Design complexity (structure, cladding, M&E, performance specs)
  • Geography and site constraints
  • Previous incidents, defects or disputes

How Insurance Helped Real Projects

Case Study: Design Error Discovered During Construction


Situation: A Design & Build contractor identified a structural design issue mid-project that required redesign and strengthening works.

Impact: Without appropriate cover, costs for expert reports, remedial works and delay-related expenses would have exceeded £250,000.

Resolution: Design liability cover supported professional defence and remediation planning, helping the contractor manage costs and complete the project.

Case Study: Water Ingress & Defects After Handover


Situation: Following completion, a commercial unit suffered water ingress linked to envelope detailing and installation issues.

Impact: Claims included investigation, access, reinstatement and tenant loss allegations, with potential costs exceeding £400,000.

Resolution: The policy supported investigation and defence costs and helped manage the claim through to resolution.

Case Study: Fire Damage on Site


Situation: A site fire damaged partially completed works and stored materials, requiring demolition, reinstatement and programme recovery.

Impact: Reinstatement and additional costs to complete were significant, alongside knock-on delay pressures.

Resolution: Contract works cover helped fund reinstatement and recovery measures to get the project back on track.

Case Study: Third-Party Property Damage


Situation: During enabling works, accidental damage occurred to adjacent property and underground services.

Impact: The incident triggered a third-party claim and urgent repairs to prevent escalation.

Resolution: Public liability cover supported legal defence and settlement, minimising disruption and protecting the contractor’s position.

Construction Risk Management Best Practices

Insurance is financial protection, but strong controls help reduce incidents, defects and disputes — and can improve pricing and terms.

Technical Controls


  • Formal design reviews, sign-off and change control
  • Clash detection and coordinated design deliverables
  • Quality assurance plans, inspections and test regimes
  • Fire risk management, hot works permits and temporary protection
  • Robust site security (CCTV, access control, material storage)
  • Temporary works design and independent checks
  • Commissioning plans and performance verification
  • Document control and as-built record management

Organizational Practices


  • Competency checks for designers and subcontractors
  • Clear scopes, interfaces and back-to-back contract terms
  • Toolbox talks and safety culture (CDM compliance)
  • Incident reporting, lessons learned and corrective actions
  • Supplier due diligence and contingency planning
  • Programme risk reviews and early warning processes (NEC)
  • Regular site audits and management reviews
  • Dispute avoidance: records, notices and communication discipline

Design & Build Insurance Coverage Levels

Flexible cover options tailored to your turnover, project values, design responsibility and client requirements.

Starter Coverage


Ideal for: Smaller Design & Build contractors with lower contract values

  • Professional Indemnity (from £250,000)
  • Public Liability (from £1,000,000)
  • Employers’ Liability (UK standard limits)
  • Contract Works cover aligned to project value
  • Basic legal expenses / claims support

Standard Coverage


Ideal for: Growing contractors handling multiple projects and higher design exposure

  • Professional Indemnity (up to £1,000,000+)
  • Public Liability (up to £5,000,000+)
  • Contract Works with offsite storage / materials extensions
  • Tools/plant options and hired-in plant extensions
  • Enhanced claims handling support
  • Optional business interruption / delay extensions

Premium Coverage


Ideal for: Established Design & Build firms with complex scopes and demanding contracts

  • Higher PI limits (including design-and-construct duties)
  • Higher contract works limits and broader perils
  • Non-negligent liability / JCT 6.5.1 style covers where required
  • Extended maintenance / defects liability extensions where available
  • Dedicated claims support and risk advice
  • Cover aligned to collateral warranties and funder requirements

Enterprise Coverage


Ideal for: Large contractors, major projects and multi-site programmes

  • Customisable PI/PL/EL limits and project placements
  • Project-specific CAR with tailored endorsements
  • Bespoke contract reviews and insurance clause alignment
  • Advanced risk management and claims protocols
  • Crisis response for major incidents and losses
  • Programme / portfolio solutions for multiple projects
Quote icon

Insure24 arranged Design & Build cover that matched our contract requirements and supported us through a complex defect claim. Outstanding guidance when it mattered most

Construction Director, UK Design & Build Contractor

PROTECT YOURSELF


  • The costs of correcting defects and completing remedial works
  • Investigation, expert reports and design defence costs
  • Damage to contract works, materials and temporary works
  • Losses from project disruption and delay following an insured event
  • Your legal defence costs and damages you are legally liable to pay to other parties

Compliance & Regulations

Our Design & Build contractor insurance can be structured to help you meet key requirements including:


  • CDM Regulations (client / principal designer / principal contractor duties)
  • Health & Safety at Work obligations and employer liability requirements
  • Building Regulations and building control requirements
  • Contract insurance clauses (JCT / NEC / EPC) and collateral warranties
  • Industry and client-specific compliance frameworks and site rules

FREQUENTLY ASKED QUESTIONS

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What is Design & Build / Turnkey Contractors insurance?

Design & Build (or turnkey) contractors insurance is designed to protect contractors who take responsibility for both design and construction under a single contract. It can include Professional Indemnity (design liability), Contract Works/Contractors All Risks, Public Liability, Employers’ Liability and optional extensions for project delay, plant and legal expenses—helping protect your business from the financial impact of incidents, defects and disputes.

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What types of contractors need Design & Build cover?

Any contractor delivering projects under Design & Build, EPC, turnkey or single-point responsibility arrangements should consider this cover—especially where you hold design responsibility in-house, through novation, or via specialist subcontractors. It is commonly required by clients, developers, principal contractors and funders under JCT/NEC contract clauses.

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What is not covered by Design & Build insurance?

Coverage depends on the policy, but common exclusions can include known defects before inception, deliberate or dishonest acts, contractual liabilities assumed beyond normal legal duties (unless specifically endorsed), poor workmanship where no resultant damage occurs, wear and tear, and certain high-risk activities without disclosure. Always check wording and contract requirements carefully.

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Can insurance replace quality control and risk management?

Insurance should not be considered a substitute for robust project controls. Strong design governance, QA processes, site safety management and subcontractor vetting reduce incidents and defects, and can improve insurer terms. Insurance is there to help manage the financial consequences when something goes wrong despite controls.

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Why do clients insist on specific limits and endorsements?

Clients, developers and funders often specify insurance requirements to protect the project and third parties. This can include minimum Public Liability limits, Employers’ Liability, Contract Works sums insured, and Professional Indemnity limits for design responsibility—sometimes including endorsements aligned to collateral warranties, contract clauses and maintenance/defects periods.

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What is Professional Indemnity for Design & Build contractors?

Professional Indemnity (PI) protects against claims alleging negligence in professional services—such as design, specification, advice, calculations or coordination. For Design & Build contractors, PI is crucial because you may be responsible for design decisions even when design is delivered by consultants or specialist subcontractors.

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Who needs Design & Build insurance?

Contractors that take overall responsibility for design and construction—whether for commercial fit-outs, refurbishments, residential developments, industrial builds or infrastructure works—should consider Design & Build insurance. It is especially important where you sign contracts with design obligations, provide collateral warranties, or manage complex interfaces and subcontractors.

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What does Design & Build insurance cover?

Cover varies, but typically includes Public Liability and Employers’ Liability, Contract Works/Contractors All Risks (damage to the works), Professional Indemnity (design liability), and optional extensions such as plant/tools, legal expenses and project delay/business interruption following an insured event.

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How much does Design & Build insurance cost?

Premiums vary based on turnover, max contract value, claims history, design responsibility, contract forms, types of work (new build vs refurb), site risks, subcontractor use and required limits. Contact us for a tailored quote aligned to your projects and contract requirements.

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What is not covered by contractor insurance?

Typical exclusions can include deliberate acts, known issues before the policy starts, normal wear and tear, and certain contractual liabilities assumed beyond legal liability unless specifically endorsed. Some policies may also restrict high-risk works or require disclosure (for example, work at height, structural alterations or specific fire risk activities).

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How do I claim on Design & Build insurance?

Contact Insure24 as soon as possible following an incident, allegation of defect or receipt of a claim/letter of claim. We’ll guide you through evidence requirements, notifications to insurers, appointment of loss adjusters/experts where appropriate, and the steps to protect your position under the contract.

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Can I get cover if I subcontract design?

Yes. Many Design & Build contractors subcontract design to consultants or specialist subcontractors. However, your contract may still make you responsible for the design. We can help structure PI and contract terms so your insurance aligns with your responsibilities and you have appropriate risk transfer in your supply chain.

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What safety measures do insurers expect?

Insurers typically expect documented risk assessments and method statements (RAMS), competent supervision, safe systems of work, design governance, quality assurance processes, subcontractor vetting, site security, and incident reporting. Strong controls can reduce claims and improve terms.

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Is contractor insurance required by law?

Employers’ Liability is a legal requirement in the UK for most employers. Other covers (Public Liability, Contract Works, Professional Indemnity) may be required by clients, funders, landlords or principal contractors as part of contract conditions.

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How long does it take to get a quote?

We can often provide indicative terms quickly, but complex Design & Build risks may require insurer review of turnover, contract values, design responsibilities and claims history. For tailored terms aligned to contract requirements, allow 1–2 business days in many cases.

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Can I adjust my coverage after purchase?

Yes. You can review and adjust limits at renewal, and in many cases mid-term where your turnover or contract values change. Speak to us if you take on larger projects, expand design scope, or need to meet a new client requirement.

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What happens if there is a defect allegation?

Notify us immediately, preserve records (design packs, change control, inspection/test evidence), and avoid admitting liability. We’ll guide you through notifying insurers, appointing experts where needed, and managing the claim to protect your position under the contract.

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Does cover include work in occupied premises?

Often yes, but it must be disclosed because it can increase risk (public interface, fire risk, business interruption exposures). We can help place cover that reflects the nature of your work and your site controls.

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What is the difference between PI and Contract Works cover?

Professional Indemnity covers claims arising from design/professional services (errors, omissions, negligent advice). Contract Works/Contractors All Risks covers physical loss or damage to the works and materials on site (for example, fire, flood or theft), subject to policy terms and conditions. Many Design & Build contractors need both.

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Do small Design & Build firms need this cover?

Yes. Smaller firms can be more vulnerable to the financial impact of a single defect allegation or site loss. Even modest projects can generate high remedial costs and legal expenses, so appropriate PI, liability and contract works cover is often essential.

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Does insurance cover contractual penalties (LDs)?

Most standard policies won’t cover pure contractual penalties. However, where delay results from an insured physical loss/damage event, some policies may include extensions for additional costs to complete or delay-related costs, subject to strict terms. We’ll help explain what’s realistic and what options exist.

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How quickly does cover respond to incidents?

Response times depend on the insurer and the incident, but early notification is key. For site losses, insurers may appoint loss adjusters quickly. For defects/design allegations, early engagement helps manage expert appointments, mitigation and defence strategy.

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Can insurance help prevent claims?

Many insurers value strong risk management and may provide guidance on best practices, site security and quality processes. While insurance doesn’t prevent incidents on its own, good controls reduce frequency and severity—and can improve terms at renewal.

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What information do I need to get a quote?

Typically you’ll need turnover, number of employees, claims history, max contract value, typical project types, contract forms used, design responsibilities (including novation/subcontracting), required limits, and details of any high-risk activities or working environments.

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Does cover include subcontractor errors?

If you hold contractual responsibility for the design or works, claims can come back to you even where a subcontractor caused the issue. Insurance can help protect your business, but strong contractual risk transfer and verification of subcontractor insurance are essential. We can help you structure this properly.

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What is legal expenses cover for contractors?

Legal expenses cover can help with certain legal costs, such as contract disputes, employment disputes, tax investigations or health & safety defence, depending on the policy. It can be a useful add-on for Design & Build firms facing contractual and operational challenges.

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How does cover work alongside existing policies?

Design & Build cover is often arranged as a package (or coordinated set of policies) so PI, PL/EL and contract works operate together. We’ll help ensure limits and overlaps are sensible, and that your cover aligns with client contracts and project responsibilities.

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What is the typical claims process?

Claims typically involve prompt notification, provision of contract documentation and records, insurer appointment of adjusters/experts where needed, mitigation actions to reduce loss, and structured communication to protect your contractual position. Insure24 will guide you throughout.

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Can you help meet funder and client insurance clauses?

Yes. We regularly help contractors align cover to contract clauses, collateral warranties and funder requirements—ensuring the right limits, endorsements and documentation are in place for tendering and mobilisation.

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What is the difference between a package policy and separate covers?

A package (or combined approach) can simplify administration and ensure core covers work together. Separate policies can sometimes offer more flexibility for specialist needs (for example, higher PI limits or project-specific CAR). We’ll advise on the best structure for your business and contracts.

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