Subcontractor default insurance (SDI)
In the United States, subcontractor default insurance (SDI), commonly known by its popular brand name Subguard, is a safeguarding tool for contractors to mitigate the risk of their subcontractors defaulting.
Rather than being a guarantee like a surety bond, it is an insurance product. A surety bond is an agreement between three parties – the contractor, subcontractor and surety. The performance of the subcontractor is guaranteed by the surety. By contrast, SDI is an agreement between the contractor and insurer.
Rather than providing a guarantee of performance or payment, the insurer commits to reimbursing the contractor for costs relating to default of a subcontractor or supplier. This is usually a high-deductible dollar amount, which means that the contractor must absorb some costs in rectifying the default, but the exact amount is negotiable.
The insurer can also replace the performance bonds of subcontractors by providing the contractor with additional cover against default losses. However, it does not act as a substitute for a payment bond, meaning that if the contractor defaults on payment to the subcontractor or becomes insolvent, the subcontractor is not covered by the policy.
SDI can be advantageous over a normal default process by avoiding litigation and delays that can impact on the project schedule.
[edit] Related articles on Designing Buildings Wiki
- Advance payment bond.
- Bonds.
- Contractors’ all-risk insurance.
- Contract works insurance.
- Insurance.
- Legal indemnities.
- Liens.
- Mechanic’s lien.
- Performance bond.
- Retainage.
- Sub-contractor.
- Surety.
- Warranty.
[edit] External references
Featured articles and news
Future Homes Standard Essentials launched
Future Homes Hub launches new campaign to help the homebuilding sector prepare for the implementation of new building standards.
Building Safety recap February, 2026
Our regular run-down of key building safety related events of the month.
Planning reform: draft NPPF and industry responses.
Last chance to comment on proposed changes to the NPPF.
A Regency palace of colour and sensation. Book review.
Delayed, derailed and devalued
How the UK’s planning crisis is undermining British manufacturing.
How much does it cost to build a house?
A brief run down of key considerations from a London based practice.
The need for a National construction careers campaign
Highlighted by CIOB to cut unemployment, reduce skills gap and deliver on housing and infrastructure ambitions.
AI-Driven automation; reducing time, enhancing compliance
Sustainability; not just compliance but rethinking design, material selection, and the supply chains to support them.
Climate Resilience and Adaptation In the Built Environment
New CIOB Technical Information Sheet by Colin Booth, Professor of Smart and Sustainable Infrastructure.
Turning Enquiries into Profitable Construction Projects
Founder of Develop Coaching and author of Building Your Future; Greg Wilkes shares his insights.
IHBC Signpost: Poetry from concrete
Scotland’s fascinating historic concrete and brutalist architecture with the Engine Shed.
Demonstrating that apprenticeships work for business, people and Scotland’s economy.
Scottish parents prioritise construction and apprenticeships
CIOB data released for Scottish Apprenticeship Week shows construction as top potential career path.
From a Green to a White Paper and the proposal of a General Safety Requirement for construction products.
Creativity, conservation and craft at Barley Studio. Book review.
The challenge as PFI agreements come to an end
How construction deals with inherited assets built under long-term contracts.
Skills plan for engineering and building services
Comprehensive industry report highlights persistent skills challenges across the sector.
Choosing the right design team for a D&B Contract
An architect explains the nature and needs of working within this common procurement route.
Statement from the Interim Chief Construction Advisor
Thouria Istephan; Architect and inquiry panel member outlines ongoing work, priorities and next steps.
























