How Is an Interior Design Fee Calculated? The Factors That Determine the Price
🇹🇷 This article describes regulations and processes specific to Turkey — requirements differ in other countries.
An interior design fee isn't calculated on total construction area the way an architecture fee is — it works on a different logic. Here's what actually determines the price, and when it rises.
If you're asking how much interior design costs and expecting a clean price-per-square-meter, you're asking the wrong question — because interior design isn't calculated with the "total construction area × unit cost" logic that an architecture fee is based on.
Why the logic is different from an architecture fee
An architecture fee rests on a baseline built from multiplying the official cost-per-square-meter by the building's total construction area — because an architectural project covers every square meter of the building (from structural system to roof) at the same rate. Interior design is different: 100 m² of one space and 100 m² of another can demand very different amounts of work depending on how intensively they're used. That's why an interior design fee is shaped by scope, not area.
What actually determines the price
- Scope of service: Do you want only a concept and material palette, or a turnkey process running from furniture selection through execution follow-up? The wider the scope, the higher the fee.
- How intensively the space is used: A bedroom and a kitchen or wet area carry a different level of detail even at the same square footage; commercial spaces (café, store, office) generally demand more technical detail than residential ones.
- Number of 3D visualizations: Requesting a separate photorealistic render for every space is more work than a single overall visualization.
- Material/furniture procurement follow-up: Are you only getting the design, or are we also following the purchasing and execution process for materials and furniture?
The official baseline: the Chamber of Interior Architects' minimum fee schedule
Similar to the architecture fee, the Chamber of Interior Architects publishes a minimum fee schedule that's updated every year. But because this schedule is rated per space and per scope, there's no single answer to "my home is 120 m², how much will it cost" — a figure given before the scope is clarified is either a very rough estimate or something that gets revised later.
How the process works at MEEZ Mimarlık
On the Elif Perde store project we designed and built in Yomra, we clarified the scope (storefront concept, circulation, lighting) from the start, which let the project stay true to its planned budget and timeline. At our first meeting, we work through your space, which areas it will cover, and the level of detail you're requesting, and then present a written quote based on that.
Frequently Asked Questions
Is there an official baseline for interior design fees?
Yes, the Chamber of Interior Architects publishes a minimum fee schedule every year; but unlike an architecture fee, this schedule isn't rated on total construction area — it's rated on the project's scope and the workload per space, which is why expecting a clean "price per m²" is misleading.
Can I get a quote for just one room?
Yes. You can request interior design for a single room, a single apartment, or the whole home, separately; the more narrowly you define the scope, the clearer the quote becomes.
What pushes the price up the most?
A wider scope of service (whether it stays at concept-only or includes furniture/material selection and execution follow-up), how intensively the space is used (commercial spaces generally demand more detail than residential ones), and the number of 3D visualizations requested.
