Sole source contract

A sole source contract is an award made to one supplier without a competitive process, because only that supplier can meet the requirement or because circumstances justify skipping competition. It has to be justified in writing, and in public procurement that justification is open to challenge.

Why it matters in B2B sales

For a supplier, a sole source award is the best commercial outcome available: no price pressure from rivals, no scored comparison, and a much shorter cycle. It is also the outcome competitors work hardest to prevent, because a sole source justification can usually be contested if the requirement was written around one product.

For everyone else, it is a signal worth reading. A buyer who awards sole source has usually decided the market long before any document was published, which means the competition happened during conversations nobody else was part of. Seeing sole source awards in an account you want tells you where the real work is.

When a sole source award is justified

The grounds are narrower than sellers hope. Genuine single-supplier capability, where only one provider can technically meet the need. Compatibility with existing systems, where introducing a second supplier would create disproportionate cost or risk. Intellectual property or exclusive rights. Genuine urgency arising from events the buyer did not cause and could not foresee. Continuation of existing work where re-competing would be unreasonable.

Public buyers must record the justification and can be challenged on it, and challenges succeed often enough that procurement teams are cautious. Urgency is the most-abused ground and the most frequently overturned, because urgency the buyer created by planning badly does not usually qualify.

Sole source vs competitive tender

A tender discovers the market price and the range of possible approaches, at the cost of time and effort for everyone involved. A sole source award skips that discovery, which is faster but leaves the buyer without an independent check on whether the price is reasonable.

Buyers manage that gap by negotiating harder on an open book basis, benchmarking against comparable contracts, or limiting the term so the requirement returns to competition sooner. A supplier walking into a sole source negotiation expecting an easy price usually finds the opposite: the scrutiny moves from the market to the buyer's own commercial team. Contract terms tend to be tighter too, often through a detailed master service agreement that anticipates the absence of competitive pressure later.

A concrete example

A hospital trust needs to extend a clinical records system for two years while a replacement programme runs. Re-competing would mean two migrations in three years, with clinical risk attached to both. The trust records a sole source justification on compatibility and continuity grounds, publishes a transparency notice, and negotiates the extension with an open book cost review and a hard end date. No competitor challenges it, because the continuity argument is documented and the term is capped.

How it shows up in a modern proposal workflow

Sole source work still produces documents. The buyer needs a proposal to justify the award internally, a scope description, and pricing that survives scrutiny without a competitive benchmark to anchor it. That paperwork often gets treated casually because the deal feels won, and casual scope definition on an uncontested award is how the delivery margin disappears. Cobl keeps the deal and its documents in one workspace, so the scope and pricing that get agreed are the ones the team actually intended.

The absence of a competitor does not remove the need to be precise. It removes the deadline that used to force it.

Frequently asked questions

Is a sole source contract legal?

Yes, where the grounds are met and documented. Public procurement rules permit non-competitive awards in defined circumstances and require the buyer to record why. What is not permitted is using those grounds as cover for a preference, which is what a challenge would test.

What is the difference between sole source and single source?

Usage varies by market and the terms are often interchangeable. Where a distinction is drawn, sole source means only one supplier can meet the requirement, and single source means the buyer chose one supplier from several who could. The second is harder to justify.

Can a competitor challenge a sole source award?

In public procurement, yes, typically during the standstill period following a transparency or award notice. The challenge argues the justification does not hold and the requirement should be competed. Private buyers face no equivalent process, though internal audit sometimes plays a similar role.