Charging a flat fee for interior design means quoting one fixed amount for the entire scope of services, instead of hourly or per sq. ft. It’s common for residential projects and small offices because clients prefer upfront clarity.
Step 1: Define Your Scope
List exactly what you’ll provide:
- Concept development (mood boards, layouts)
- 3D renders
- Material selection & specifications
- Vendor coordination
- Site visits / supervision
- Execution management (if included)
The clearer the scope, the easier to justify your fee.
Step 2: Estimate Your Time & Effort
- Calculate how many hours the project will take.
- Include design work, meetings, revisions, travel, and site checks.
- Multiply by your hourly rate to arrive at a base number.
Example:
100 hours × ₹1,000/hour = ₹1,00,000 base fee.
Step 3: Adjust for Project Size
Instead of hourly detail, convert to a flat fee tier:
- 1BHK (500–700 sq ft) → ₹1–2 lakhs
- 2BHK (800–1,200 sq ft) → ₹2–3 lakhs
- 3BHK (1,200–1,600 sq ft) → ₹3–5 lakhs
- Villa / large home → ₹5–10+ lakhs
(Delhi NCR averages; you can adjust by experience and market)
Step 4: Add Execution Mark-up (Optional)
If you manage vendors, add 8–15% markup on furniture, materials, or contractor bills. This keeps your flat fee stable but covers admin effort.
Step 5: Write Payment Milestones
Split the flat fee into 3–4 stages for cash flow:
- 20–30% at agreement signing.
- 30% after concept & design approval.
- 30% during execution.
- 10–20% on completion / handover.
Step 6: Protect Yourself with Clauses
- Define number of revisions (e.g., 2 included, extra charged).
- Limit scope creep (new rooms/features = additional fee).
- Add validity period for your fee (prices rise over time).
✅ Formula for Flat Fee
Flat Fee = (Estimated design hours × hourly rate)
+ admin & overhead
+ profit margin
Then round it into a clean package rate for client presentation.
Do you want me to draft a sample flat fee proposal template (with scope, inclusions, exclusions, payment schedule) that you could use directly with clients?
