Professional services retainer

A retainer in Canadian public procurement is a term contract that engages a consultant or firm so that individual assignments can be commissioned on an as-needed basis over the contract period, instead of buying one defined deliverable up front. It is common for engineering and other recurring expertise: public buyers run a competitive process once, then feed assignments to the retainer consultant as the work arises.

How a retainer tender works

Real CanadaBuys examples show the pattern. Ontario's Ministry of Transportation has posted solicitations titled "Large Value Retainer – Structural Retainer Services" describing "an assignment to provide services for Bridge Engineering, Environmental Engineering, and Drainage and Hydrology Engineering on retainer for Provincial Highways Structures," adding that "this project will incorporate various smaller assignments" and that "the assignments will be negotiated with the retainer consultant on an as-needed and individual basis" — an estimated 24-month contract run as a competitive, open-bidding process under the Canadian Free Trade Agreement. Other retainer solicitations on the platform include large-value archaeology services retainers and detailed highway engineering design retainers, with multi-year estimated durations.

Retainer time is not automatically billable time

Federal professional-services contracting draws a line between working and merely being retained: PSPC's resulting-contract clauses for its professional-services supply arrangements define actual time worked as time spent actively performing work, excluding "passive time such as retainer or standby" time. The practical consequence: if the buyer wants paid availability — guaranteed response times, capacity held in reserve — the solicitation and resulting contract must say so. Otherwise, a retainer compensates the assignments performed, not the waiting between them.

Retainer vs. standing offer vs. supply arrangement

All three are ways to buy over time, but they differ structurally. A standing offer is not a contract at all until the buyer issues a call-up against it, and supply arrangements are pre-qualified pools that later competitions draw from — tools shared across many buyers and many suppliers. A retainer, as practised in the examples above, is a single contract with one consultant whose assignments are negotiated individually. The retainer trades breadth of supply for depth: the consultant holds institutional knowledge of the buyer's program across the whole term.

Common questions

Is a retainer exclusive to one supplier?

In the engineering examples it is — the assignments are negotiated with "the retainer consultant," singular. But exclusivity is a design choice, not a legal default: read the solicitation to see whether the buyer reserves work to one firm or splits categories across several retainers.

Do trade agreements apply to retainer contracts?

Yes — the retainer tenders listed on CanadaBuys declare the applicable agreements (CFTA or CETA in the examples) like any other solicitation. The retainer structure does not exempt the initial competition from trade-agreement obligations.

How do I price a retainer bid?

Price the assignments, not just the hours: you are committing to a term of as-needed, individually negotiated work, so your rates must cover mobilization on small assignments and the possibility that volume falls short. Build any paid-availability expectation into your rates or the contract language, because passive retainer time is excluded from billable time in federal professional-services clauses.

Related definitions

Task authorization · Supply arrangement vs. standing offer · Service contract vs. supply contract · Firm fixed price contract