How the retainer works

In most arrangements, the retainer is paid at signing and is either credited against the first phase of design fees or held as a deposit against the overall engagement. It serves two purposes: it demonstrates the client's commitment (designers, especially in-demand ones, reasonably decline to reserve months of capacity on a handshake), and it protects the designer's early investment of time in a project before much has been delivered.

The size varies by designer and project scope. What matters is that the agreement states clearly what the retainer covers, how it's applied, and what happens to it if the project pauses or ends — all of which a reputable agreement spells out.

The broader payment structure

Beyond the retainer, design engagements are typically billed in phases or on a schedule tied to milestones — design fees as the work progresses, and furnishings/procurement as items are ordered (often requiring payment or deposits up front, because the designer is purchasing on your behalf and vendors require payment). This is why a design project involves multiple payments over its life rather than one lump sum, and why understanding the schedule prevents cash-flow surprises.

A well-structured agreement makes clear what's due when, what each payment covers, and how procurement funds are handled — including whether furnishing payments flow through the designer or you pay vendors directly.

What to confirm before signing

Read the agreement for the money mechanics specifically: how the retainer is applied, the fee structure and schedule, how procurement is paid and whether markups apply, what triggers additional charges (revision rounds, scope changes, extra site visits), how reimbursables (travel, shipping, freight) are handled, and the terms if either party ends the engagement.

None of this is adversarial — it's the normal content of a professional services agreement, and the designer who has it all in writing is showing you they run a disciplined practice. Vagueness about payment, by contrast, is the most reliable early warning sign that a project's finances will be a source of friction.