Tools
Free calculators and interactive tools from KDS London.
Interior Designer Cost Calculator: Estimate Your London Design Fee
Free interior designer cost calculator: enter your rooms, floor area and budget and see your likely design fee across hourly, day, per-room, per square metre and percentage models, with the London uplift built in.
Read the guide
London Renovation Cost Calculator: Estimate Your Refurbishment Budget per m²
Free London renovation cost calculator: enter your floor area and finish level to estimate your refurbishment budget per square metre, split into build cost, design fee and contingency.
Read the guide
Paint Calculator: How Much Paint Do I Need for a Room?
Free paint calculator: enter your room dimensions, number of coats and doors and windows to work out how many litres and tins of paint you need, with an estimated cost.
Read the guide
Cost-Plus vs Retail: Interior Designer Procurement Markup Calculator
Compare buying furniture through your interior designer at trade price plus margin against buying it yourself at retail. See whether cost-plus procurement saves you money or adds to the bill.
Read the guide
Furniture Budget Calculator: How Much to Budget for Furnishing a Room
Free furniture budget calculator: enter your rooms and total furnishing budget to see a sensible spend per room and per item, from the sofa to the bed, against realistic London price bands.
Read the guideWallpaper Calculator: How Many Rolls of Wallpaper Do I Need?
Free wallpaper calculator: enter your room size, roll dimensions and pattern repeat to work out how many rolls of wallpaper you need, plus a sensible spare, with an estimated cost.
Read the guide