How to Charge for Interior Design Services: Hourly, Flat Fee, Percentage and Markup

Interior design is a business where you can deliver a beautiful project and still lose money. It usually happens in one of three ways: design time given away before a contract, project management hours never billed, or product margins that shrink when clients compare prices online. The fix is a clear fee structure built from your real costs. Here are the main options, how to combine them, and a worked project that shows what you actually keep.

All figures are typical US ranges as of 2026 and vary by market; verify locally.

Step 1: Know your target hourly rate

Even if you never bill hourly, you need this number to price flat fees and check profitability.

Designers spend large amounts of time on sales, marketing and admin. If you bill about 1,100 hours a year, you need $101 per hour to break even. With a 20 percent profit margin, your target is about $126 per hour.

Step 2: Understand the fee structures

Step 3: Decide how you handle products

Trade vendors usually sell to designers at a discount from retail. You can:

1. Pass through trade pricing and charge a procurement fee or hourly for procurement.
2. Sell at trade plus a markup below retail.
3. Sell at retail and keep the difference, disclosed to the client.
4. Let clients buy directly and bill coordination hourly.

Procurement is real work: specifying, quoting, ordering, checking acknowledgments, tracking shipments, inspecting deliveries and solving problems. Make sure your product approach pays for it. Selling products also usually means collecting sales tax and using a resale certificate when buying; check your state's rules.

Worked example: a living and dining room project

Michelle hires you for a full-service living and dining room design. Retail value of furnishings is about $45,000.

Your fee structure: flat design fee, trade plus 25 percent on products, hourly project management, and freight and receiving at cost plus 10 percent.

Michelle pays $40,000 for furnishings that would cost about $45,000 at retail, plus fees for the design, project management and coordinated delivery. You keep $16,380 of gross margin.

What that margin is really worth

If the project takes the expected 60 hours, your effective rate is $16,380 ÷ 60 = $273 per hour, comfortably above your target. If client changes, back orders and extra site visits push it to 120 hours and you have not billed the extra project management, it falls to $136 per hour. That is why hourly project management and change authorizations matter.

The same project with only a markup

Some designers charge no design fee and rely on product markup. At 30 percent on $32,000 of products, you earn $9,600. Over 80 hours of design and management, that is $120 per hour, and if the client buys half the products elsewhere, your earnings collapse to $4,800. Never rely on product margin alone.

Typical ranges to sanity-check your prices

Explaining fees to clients

"Our design fee covers the creative work: space planning, selections and drawings. Products are offered at trade cost plus 25 percent, which covers ordering, tracking, receiving, inspection and resolving any vendor issues. Because you get trade pricing, most clients pay less than retail even with our margin. Project management and site visits are billed hourly so you only pay for what the project needs."

Put it all in writing. Your contract should state every fee, the markup or procurement fee, when payments are due, that products are paid for before ordering, and how changes are billed.

Pricing mistakes to avoid

• Free design work before the contract is signed
• No minimum project size, leading to many small, unprofitable jobs
• Unbilled project management, often the largest hidden cost
• Ordering before client payment, risking custom items you cannot return
• Vague revision limits, leading to endless redesigns
• Not tracking time, so you never learn which projects are profitable

Fee-setting checklist

• ☐ Annual costs, owner pay and billable hours estimated
• ☐ Target hourly rate calculated
• ☐ Fee structure chosen for each service type
• ☐ Product policy (markup, procurement fee or client-direct) written
• ☐ Freight, receiving and delivery policy
• ☐ Revision limits and change billing
• ☐ Payment before ordering in every contract
• ☐ Time tracked on every project

Retainers and payment schedules

Cash flow matters as much as fees. A common structure:

Keep client product deposits in a separate account so they are always available to pay vendors.

Pricing e-design and consultations

Not every client can afford full service. Lower-priced offers keep you from turning them away:

• Paid consultation: a fixed-length visit with advice and a short follow-up list, often $150-$500 and credited if they hire you.
• E-design: a mood board, floor plan and shopping list for a set fee per room, with a limited number of revisions.
• Hourly shopping or styling: billed in half-day or full-day blocks.

These offers also feed your full-service pipeline when clients come back for larger projects.

Your next step

Calculate your target hourly rate, then reprice your last project using the flat-plus-hourly-plus-markup structure above. Compare what you earned with what you should have earned.

The full guide, Starting an Interior Design Business, covers state interior design laws, NCIDQ, legal setup and sales tax, contracts, trade accounts and procurement, portfolio marketing, hiring and a 30/60/90-day plan for $0.99.