Bidding Under FAR 52.249-10: 5 Costly Default Mistakes
On federal fixed-price projects, default terms are not negotiable boilerplate. Prescribed under FAR 49.504(c)(1), the standard contract clause FAR 52.249-10 Default (Fixed-Price Construction) grants the government sweeping authority if a contractor fails to prosecute the work with diligence or fails to finish on schedule. For interior framing estimators, ceiling trades, and general contractors assembling competitive bids, misunderstanding these provisions creates severe financial exposure. Here are five critical mistakes contractors make when reading and pricing contracts governed by this clause.
Mistake 1: Missing the Strict 10-Day Written Delay Notice
The clause provides relief from default termination and damages when schedule delays stem from qualifying excusable causes. However, this protection is conditioned on a tight procedural timeline. Under paragraph (b)(2), the contractor must notify the Contracting Officer in writing within 10 days from the beginning of any delay, unless the Contracting Officer grants an extension to this period.
Estimators and project managers often assume delay claims can be bundled into monthly pay applications or addressed at final closeout. Under FAR 52.249-10, waiting beyond the 10-day window puts the contractor at risk of losing excusable delay protections. The Contracting Officer is tasked with evaluating the facts and the extent of the delay to determine if an extension is warranted. Because the Contracting Officer's findings are final and conclusiveâsubject only to appeal under the Disputes clauseâcontemporaneous written documentation must be accounted for within your administrative general conditions estimating budget.
Mistake 2: Assuming Subcontractor Delays Are Automatically Excusable
A common pitfall for general contractors and lower-tier trades is assuming that a material supplier's failure or a trade partner's schedule slip automatically excuses project delays. Under paragraph (b)(1)(xi) of Acquisition.GOV FAR 52.249-10, supplier or subcontractor delays only qualify as excusable if they arise from unforeseeable causes beyond control and without the fault or negligence of both the prime contractor and the subcontractors or suppliers at any tier.
To avoid default exposure, estimators must understand which events qualify as excusable under the clause. Listed examples include:
- Acts of God or of the public enemy
- Acts of the Government in either its sovereign or contractual capacity
- Acts of another Contractor performing a contract with the Government
- Fires, floods, epidemics, and quarantine restrictions
- Strikes and freight embargoes
- Unusually severe weather
If a supplier fails to deliver drywall studs or acoustic panels due to ordinary commercial troubles, that failure does not meet the standard of being beyond their control and without fault.
Mistake 3: Overlooking Government Takeover of Site Appliances and Materials
When the government terminates a contractor's right to proceed under paragraph (a), it has the right to take over the project and finish the work by contract or otherwise. Crucially, the clause states the government may take possession of and use any materials, appliances, and plant on the work site that are necessary to finish the job.
Subcontractors frequently bring rented staging, specialized appliances, and uninstalled inventory to the site. If the project enters default, those physical assets can be retained on the property for project completion. Estimators and trade bidders should evaluate how stored site inventory and plant equipment are safeguarded under their downstream agreements.
Mistake 4: Disregarding Surety Exposure and Reprocurement Costs
Default termination does not end monetary exposure. Paragraph (a) explicitly specifies that the contractor and its sureties remain liable for any damage resulting from the refusal or failure to complete the work within the specified time, regardless of whether the right to proceed was officially terminated. This liability includes any increased costs incurred by the government in completing the construction.
Because the government can backcharge the prime contractor and the bonding company for the full cost premium of hiring a replacement contractor, default can trigger devastating surety claims. Understanding these cross-liabilities is essential when structuring bid bonds, performance bonds, and payment bonds for federal bids.
Mistake 5: Failing to Review Demolition and Emergency Alternates
Not every project uses the base April 1984 text unaltered. Estimators must check the solicitation for specific alternates:
- Alternate I: Used on contracts for dismantling, demolition, or removal of improvements. Paragraph (a)(2) mandates that title to property vested in the contractor revests in the government, unless the contractor has already removed it from the site or disposed of it via a bona fide sale.
- Alternate II: Applied during periods of national emergency. It modifies the delay standard to causes other than normal weather that are beyond the contractor's control.
- Alternate III: Combines dismantling and demolition terms with national emergency delay modifications.
The Excusable Default Fallback
Paragraph (c) contains an important protection: if the government terminates a contractor for default and it is later determined that the failure was excusable or that no default occurred, the action automatically converts. In that scenario, the rights and obligations of both parties are treated exactly as if the termination had been issued for the convenience of the government.
Sources
FAR 52.249-10 Default (Fixed-Price Construction) | Acquisition.GOV
Published October 28, 2026. No affiliate links on this page. Facts come from the sources linked above; check them for updates.