Interior Design Proposal: Scope, Fee Structures, and What Clients Need Before Saying Yes

What to include in an interior design proposal

Begin with a project overview that describes the space, the design goals, and any constraints the client mentioned during your initial walkthrough. Then break the engagement into phases: programming and space planning, schematic design, design development, procurement, and installation oversight. For each phase, list the deliverables. Space planning means floor plans and furniture layouts. Schematic design means concept boards, material palettes, and preliminary selections. Design development means finalized specifications, custom millwork drawings, and vendor coordination. Be specific about what documents the client will receive and at which approval points. Include your fee structure, a procurement section explaining how purchasing works, and your terms around client-supplied items.

• Project overview with space description and design goals
• Phases: programming, schematic, design development, procurement, installation
• Deliverables per phase (floor plans, concept boards, specifications)
• Fee structure with billing method explained
• Procurement process, trade pricing, and markup policy
• Client responsibilities (access, decisions, contractor coordination)

Fee structures for interior design projects

Interior design fees typically follow one of four models: flat fee, hourly rate, percentage of project cost, or cost-plus (trade pricing plus a markup). Flat fees work best for well-defined projects where the scope is unlikely to change significantly. Hourly billing suits projects where the client wants flexibility to scale up or down. Percentage-based fees align your compensation with the project budget but require transparent cost tracking. Cost-plus is common in full-service residential work where you handle procurement. Whichever model you use, separate the design fee from procurement costs in the proposal. Clients who see a single number cannot tell what they are paying for design versus product, and that ambiguity causes friction when the budget tightens.

• Flat fee: predictable for both sides, requires clear scope
• Hourly: flexible, suits undefined or evolving projects
• Percentage of project cost: scales with budget, needs transparent tracking
• Cost-plus: standard for full-service procurement, markup typically 20% to 35%

Handling procurement and purchasing in the proposal

Procurement is where interior design proposals diverge from most creative services. If you handle purchasing on behalf of the client, the proposal must explain the process in detail: how you present selections, how the client approves purchases, who places orders, who receives deliveries, and who manages returns. Specify your markup or management fee on goods. Clarify whether the client pays you and you pay vendors, or whether the client pays vendors directly. Address lead times. Custom furniture and imported materials can take 12 to 20 weeks, and clients who do not understand this timeline will blame you when their living room is empty on move-in day. A dedicated procurement section in the proposal prevents most of these conflicts.

Managing client expectations around timelines

Interior design timelines depend on factors outside your control: contractor schedules, permit approvals, vendor lead times, and client decision speed. Your proposal should include a realistic timeline with caveats. Break it into design phases and construction or installation phases. Flag the dependencies: the design development phase cannot start until the client approves the schematic design. Procurement cannot begin until selections are finalized and paid for. Installation depends on the contractor finishing their scope. Give ranges rather than exact dates for phases that depend on third parties, and state clearly that delays in client approvals extend the overall timeline by at least the same duration.

Scope boundaries and what full-service does not include

"Full-service interior design" sounds comprehensive, but it still has limits. Your proposal should list what is excluded. Common exclusions: architectural or structural work, HVAC and plumbing, landscape design, window treatments by a specialty workroom (if you subcontract this), artwork sourcing beyond a defined budget, and storage of client-purchased items. If the project involves renovation, clarify whether you provide construction administration (site visits, contractor coordination, punch list management) or whether that is a separate fee. Clients assume full-service means everything, so the exclusions section does more work in an interior design proposal than in most other industries.