Interior Designer Cost Calculator: Estimate Your London Design Fee
Two designers can quote wildly different numbers for the same flat and both be fair: one charges by the hour, the other a percentage of your build. This calculator shows your likely design fee across all five models at once, so you can compare quotes like-for-like. It is the fee only, not the furniture, builders or materials.
Your project
Use the spread, not a single figure. The right model depends on how much hands-on management you want, not just the headline rate. For a full breakdown of what each model buys you, read our guide on how interior designers charge.
The Folio
Want more like this in your inbox?
One considered idea for your London home, every Thursday.
SubscribeMore from KDS London
All guides
How Much Does an Interior Designer Cost in London in 2026?
What interior designers charge in London in 2026: hourly rates, day rates, per-room fees and percentage models, with real figures and what each one buys you.
Read
Interior Designer Fees Explained: Hourly, Per Square Metre, and Percentage Models
How UK interior designers charge: hourly, day, per room, per square metre and percentage fees, with real London figures and what each model means for you.
Read
How to Find and Hire the Right Interior Designer in London
A practical London guide to finding, vetting and hiring an interior designer: where to look, fee structures, the questions to ask and red flags to avoid.
Read