Writing a Sole-Source Justification for Park Amenities

A defensible sole-source justification for park amenities documents why only one product or supplier can meet a specific, legitimate project requirement, backed by evidence rather than preference. When that case cannot be made clearly, a competitive process or a brand-plus-equal approach is usually the better and more defensible route.

Key takeaways

Sole-source justification should be based on a specific, documented project need, not general preference for a supplier.
Compatibility with existing equipment, unique performance features, or a genuinely unavailable alternative are common legitimate grounds.
The justification memo needs to show that alternatives were actually considered and ruled out, not simply asserted as inadequate.
Most procurement codes require sole-source justifications above a certain dollar threshold to go through an approval process before the purchase is made.
A brand-plus-equal specification often achieves the same practical goal with less procurement risk than a sole-source claim.

What Sole-Source Procurement Is Actually For

Sole-source procurement allows an agency to purchase from a single supplier without a competitive process when a documented, legitimate reason makes competition impractical or contrary to the project's interest. It is meant to be the exception, not a routine path to a preferred vendor.

Most public procurement codes set a higher documentation bar for sole-source purchases than for a standard bid, precisely because it removes the competitive check on price and quality. This makes the justification memo the single most important document in the file.

Grounds That Typically Support a Sole-Source Case

Compatibility. New equipment must integrate with an existing system, such as matching fencing style or an established playground manufacturer's proprietary connection system.
Unique performance feature. A specific, documented performance requirement that only one product on the market currently meets.
Emergency replacement. A safety issue requiring immediate replacement where a competitive timeline is not practical.
Warranty or service continuity. Maintaining an existing warranty or service relationship where switching suppliers would void coverage on other equipment.

Each of these needs specific, project-level evidence, not a general statement that the incumbent product "works well" or is "preferred by staff."

What a Defensible Justification Memo Contains

Section	What to include
Project description	Scope, budget and timeline for the purchase
Specific need	The exact requirement driving the sole-source claim
Alternatives considered	Other products or suppliers evaluated and why each was ruled out
Market research summary	Evidence that a reasonable search for alternatives was conducted
Cost reasonableness	How the agency confirmed pricing is fair, such as comparison to past purchases or catalog pricing
Approval signatures	Sign-off from whoever the procurement code requires at the applicable dollar threshold

A memo missing the alternatives-considered section is the most common reason a sole-source justification fails review, because it looks like preference rather than necessity.

Showing That Alternatives Were Actually Considered

Reviewers and auditors look specifically for evidence that other products or suppliers were researched, not just asserted as inadequate. This can include a summary of other manufacturers contacted, cut sheets reviewed, or a brief comparison table showing why each alternative did not meet the documented need.

This step overlaps closely with how an or-equal substitution review works in reverse. See handling or-equal substitution requests for park equipment for the comparison framework, which applies just as well when an agency is evaluating whether true alternatives exist before writing a sole-source memo.

When Brand-Plus-Equal Is the Better Route

A brand-plus-equal specification names a preferred product as a reference standard while still allowing bidders to propose an equivalent, which achieves much of what a sole-source claim is trying to protect, such as a known performance level, while preserving competition and reducing procurement risk.

This approach is often the more defensible choice when the underlying concern is quality or performance rather than genuine unavailability of alternatives. See writing a dog park specification that holds up during bidding for how to structure a brand-plus-equal clause correctly.

Understanding Approval Thresholds and Review

Most procurement codes require sole-source purchases above a certain dollar amount to go through a formal review or board approval process before the purchase is finalized, and some require public notice of the intent to sole-source before the purchase proceeds. These thresholds and procedures vary by jurisdiction, so confirm current requirements with your procurement office or legal counsel before relying on a sole-source approach.

Skipping this review, even for a purchase the agency believes is clearly justified, can expose the purchase to a protest or an audit finding later.

Getting the Documentation Right Before You Need It

Agencies considering a sole-source purchase for park amenities benefit from starting the documentation early, while the reasoning is fresh and alternatives can still be genuinely researched, rather than reconstructing a justification after the fact to support a purchase already made. That sequence is one of the fastest ways to create an indefensible record.

If your agency is weighing a sole-source purchase, a brand-plus-equal specification, or a fully competitive RFP for an upcoming amenity project, our RFP support resources can help clarify the tradeoffs, and our team can provide product documentation to support a market research review through a project quote.

Frequently asked questions

Is a sole-source justification the same as an emergency purchase?

No, though they can overlap. An emergency purchase is typically justified by urgency, while a sole-source justification is based on the unavailability of a competitive alternative. Some purchases may qualify under both, but the documentation requirements differ, so check your procurement code.

Who typically approves a sole-source justification?

This varies by agency and dollar threshold, but many procurement codes require sign-off from a purchasing officer, department head, or governing board above a certain amount. Confirm your specific approval chain before proceeding.

Can a sole-source purchase be challenged after the fact?

Yes. A losing competitor, an auditor, or an oversight body can question a sole-source purchase, which is why the justification memo needs to stand on its own with documented evidence rather than relying on informal reasoning.

Does naming a specific manufacturer in a spec always require a sole-source justification?

Not if the spec includes an or-equal or brand-plus-equal provision that allows other bidders to propose an equivalent product. A sole-source justification is generally needed only when no competitive alternative is permitted at all.