Single Source Justification: When to Skip the RFP (and When You Shouldn't)
Single source justification and sole source procurement are sometimes legitimate. Here is when they are appropriate, what documentation you need, and when a fast RFP is better.
Sometimes a sole-source award is the right call. Sometimes it is a shortcut dressed up in paperwork.
Single source justification exists for situations where competition is genuinely impractical. Used correctly, it saves time and protects the organization when open competition would not produce a better outcome. Used incorrectly, it creates audit exposure, reduces pricing power, and builds vendor dependencies that are expensive to unwind.
Here is how to tell the difference.
When sole source procurement is legitimate
True unique capability. One vendor holds a patent, proprietary process, or exclusive license that makes them the only source for what you need. This is the clearest case. Document the specific capability, confirm it is not available from any other source through a market assessment, and record the steps you took to verify uniqueness.
Emergency procurement. A situation that poses immediate risk to health, safety, operations, or critical infrastructure requires a faster response than a competitive process allows. The emergency must be genuine, not a planning failure that was allowed to become urgent. Post-emergency, document what happened and what process changes will prevent the same emergency procurement from recurring.
Continuation of existing work. A vendor is mid-engagement on work that cannot be paused or handed off without significant disruption. This is legitimate for true continuity: ongoing research, systems work where transition risk is high, or work that requires institutional knowledge built over the current engagement. It is not a legitimate justification for simply renewing a contract because it is convenient or because the prior vendor is familiar.
Proprietary integration or compatibility. An existing system requires components, maintenance, or upgrades that only the original manufacturer or licensed reseller can provide without voiding warranties or creating compatibility issues. Document the technical dependency and confirm it cannot be resolved through open standards or alternative integration paths.
When sole source is not appropriate
You have a preferred vendor and do not want the hassle of competing. This is the most common misuse. The preferred vendor may even be a good choice. But preference is not a justification. A competitive process tests whether the preferred vendor is actually the best choice at the best price.
The timeline is tight but not an emergency. Tight timelines are a procurement planning problem. Calling a procurement "urgent" to justify sole source when the urgency came from late internal decision-making shifts risk from the procurement team to the organization. If a faster competitive process is possible, run one.
The market is small. A small market is not the same as a single source. Two or three qualified vendors in a niche market still enables competition. Small markets sometimes require simplified RFP processes, but they rarely justify eliminating competition entirely.
You already negotiated a price. Starting vendor conversations before procurement is complete and then claiming sole source to formalize the arrangement is circular. The conversation that produced the "negotiated price" should have happened after a competitive selection.
The documentation a defensible justification requires
A single source justification document needs to stand up to scrutiny from auditors, oversight bodies, and anyone with a reason to challenge the procurement decision. At minimum it should include:
Statement of need. What is being procured, what business purpose it serves, and why it is needed now.
Basis for sole source. Which legitimate basis applies (unique capability, emergency, continuity, proprietary compatibility), with specific evidence for each claim.
Market assessment. Documentation that you looked for competitive alternatives and did not find any that could meet the requirement. This can be a brief written summary for small procurements or a formal market survey for larger ones. "We know of no other qualified vendors" is not a market assessment. Calls, web searches, or a formal RFI that produced no qualified responses is a market assessment.
Price reasonableness determination. Even without competition, you need to document that the price is fair. Acceptable methods: comparison to published price lists, prior competitive procurement for similar work, independent cost estimate, or comparison to market benchmarks.
Approvals. Most organizations require escalating approval authority based on sole source value. Know your approval thresholds before you write the justification.
The risks of over-using sole source
Audit exposure. Government contracts and heavily regulated industries treat sole source as an exception that requires justification, not a routine option. Over-use creates a pattern that attracts scrutiny.
Vendor dependency. Every sole source award strengthens a vendor relationship that has not been tested by competition. Over time, you lose visibility into what market alternatives exist and what competitive pricing looks like. When you eventually need to replace or compete the vendor, the transition cost is higher.
Pricing power loss. Vendors who win without competition have no pricing pressure. Initial pricing may be reasonable; renewal pricing may not be. Once a vendor knows they face no competitive threat, they negotiate differently.
Internal precedent. Once sole source becomes an available shortcut in your organization, the bar for justifying it tends to lower over time. What starts as an exception becomes a workaround, then a habit.
When a streamlined RFP is faster than you think
Before choosing sole source, consider whether a simplified competitive process would take longer than you assume.
A short-form RFP with three to five questions, a two-week response window, and a scoring rubric that covers the key decision criteria can be completed in four to six weeks. If your sole source justification process requires the same approvals, documentation, and legal review, it may not actually save time.
For straightforward procurements with a small qualified vendor pool, a Request for Quote (RFQ) is often the right tool. An RFQ can go out to three vendors, come back in a week, and produce a defensible competitive selection without the complexity of a full RFP process.
The question to ask before writing a sole source justification: if this procurement were challenged six months from now, would the justification hold? If you would feel uncomfortable presenting the documentation to an auditor, a board, or a public records request, run a competitive process instead.
Strutter AI helps procurement teams run competitive RFP processes quickly, including simplified and short-form evaluations. Start free at rfp.strutterai.com.