Builders Insurance UK: A Complete Guide

What Is Builders Insurance?

Builders insurance is a specialist commercial insurance package designed for individuals and businesses carrying out building and construction work. It combines several types of cover — public liability, contract works, employers' liability, and plant and equipment — into a single arrangement that addresses the specific risks of construction activity.

Building contractors face liability exposure across the full construction process — from groundworks and structural work to finishing and fit-out. The risks include third-party injury on site, accidental damage to client property, damage to work in progress, theft of plant and materials, and liability arising from the completed work. A well-arranged builders insurance policy provides protection against the most common and most costly of these risks.

Who Needs Builders Insurance?

Builders insurance is relevant to a wide range of construction businesses and contractors:

• General building contractors and sole traders
• Groundworkers and civil engineering contractors
• Bricklayers and structural contractors
• Plasterers and dry-liners
• Carpenters, joiners, and shopfitters
• Demolition contractors
• Renovation and refurbishment contractors
• Self-build project managers
• Main contractors managing subcontractors on site

Main contractors and principal contractors on construction sites have additional insurance obligations under the Construction (Design and Management) Regulations 2015 (CDM 2015), including ensuring that all subcontractors hold adequate insurance before commencing work on site.

Public Liability Insurance

Public liability insurance is the foundation of any builders insurance package. It covers claims from third parties — clients, visitors, or members of the public — for injury or property damage caused during the course of your construction work.

Standard public liability limits for builders are £1 million, £2 million, or £5 million. Many commercial clients, local authorities, and main contractors require a minimum of £5 million as a condition of contract. Builders working on larger commercial projects may need limits of £10 million or above.

Employers' Liability Insurance

Employers' liability insurance is a legal requirement for any building business that employs staff, including apprentices, casual labour, and in many cases subcontractors. The minimum legal limit is £5 million, though most policies are issued at £10 million.

The construction sector has a higher rate of workplace injury than most other industries. Employers' liability cover protects the business against claims from employees injured in the course of their work. Failure to hold valid cover can result in fines of up to £2,500 per day.

Contract Works Insurance

Contract works insurance (also known as works in progress insurance) covers the work being carried out against damage or destruction before it is completed and handed over to the client. This is distinct from public liability, which covers damage to third-party property.

Without contract works cover, a builder whose work in progress is damaged by fire, flood, storm, or vandalism would have to bear the cost of reinstatement themselves. Contract works cover ensures the cost of making good is met by the insurer, allowing the project to be completed without financial loss to the contractor.

• Covers work in progress against damage or destruction
• Includes materials on site and in transit
• Can be arranged on a single-project or annual basis
• Typically excludes defective workmanship (covered by professional indemnity)
• Should be confirmed against the contract terms with the client

Plant and Equipment Cover

Building contractors rely on plant, machinery, and tools that can be expensive to replace. Plant and equipment cover protects against theft, accidental damage, and breakdown of plant and equipment — both on site and in transit.

Hired-in plant (equipment hired from a third party) typically requires separate cover, as the hire company's own insurance does not protect the contractor against damage or theft while the plant is in their care. Hired-in plant cover should be confirmed as part of any builders insurance arrangement.

Professional Indemnity Insurance

Builders who undertake design-and-build contracts, produce specifications, or provide technical advice should consider professional indemnity insurance. This covers claims arising from errors or omissions in professional advice or design that cause financial loss to a client.

Professional indemnity is increasingly required by commercial clients on design-and-build projects. It is written on a claims-made basis, meaning the policy in force at the time the claim is made responds to the claim — not the policy in force when the work was done.

Contractors' All Risks Insurance

Contractors' all risks (CAR) insurance is a comprehensive policy that combines contract works cover, public liability, and employers' liability into a single arrangement. It is commonly required on larger commercial construction projects and is often specified in the contract conditions (JCT, NEC, or other standard forms).

CAR policies can be arranged on a project-specific basis for major contracts, or on an annual basis for contractors with a regular programme of work. The appropriate structure depends on the nature and value of the work undertaken.

What Affects Builders Insurance Premiums?

Several factors influence the cost of builders insurance:

• Type of construction work undertaken (domestic, commercial, civil engineering)
• Annual turnover and contract values
• Number of employees and subcontractors
• Public liability limit required
• Claims history
• Whether contract works cover is included and the maximum contract value
• Plant and equipment values
• Geographic area of operation

Arranging Builders Insurance

Builders insurance is best arranged through a specialist commercial broker with access to the construction insurance market. A broker can compare terms across multiple underwriters, ensure the policy covers your specific activities and contract values, and advise on the appropriate structure for your business.

Focus Insurance Services arranges specialist builders insurance for sole traders and building contractors across the UK. Our brokers understand the specific requirements of the construction sector and can arrange cover that meets the requirements of standard form contracts (JCT, NEC) and commercial clients.

Builders who employ staff should also review our guide to employers' liability for contractors. Those operating a fleet of vehicles should review our van insurance guide for tradespeople and our tradesman insurance guide for a broader overview of the cover options available.