Room Renovation Cost & Material Planner
Drag the sliders and the 3D room below stretches, shrinks and redraws in real time. Paint, flooring, tiles, wallpaper, skirting and your own cost estimate update with it — no sign-up, nothing to install.
Enter a figure from your own quote. We don't pre-fill prices because they vary by region and specification.
Furniture is drawn at real size (a 2 m sofa, a 1 m table), so you can see how the space changes as you resize it.
Five focused calculators, each paired with a practical guide explaining the maths, the trade-offs and the mistakes that cost money.
Guide 01 · Measuring
Floor area, perimeter, gross and net wall area and volume, plus how to measure awkward rooms with alcoves and bays.
Open the room size guideGuide 02 · Walls
Litres and tins from net wall area and coats, rolls from drops and pattern repeat, and how to pick a finish.
Open the paint & wallpaper guideGuide 03 · Floors
Packs of flooring and boxes of tiles, including grout joints, layout waste and a comparison of common floor types.
Open the flooring & tile guideGuide 04 · Quantities
Turn a net quantity into a sensible order, round to whole packs, and measure your real waste percentage afterwards.
Open the materials & waste guideGuide 05 · Budget
Build a budget from your own material and labour rates, extras and contingency — and learn how to compare quotes fairly.
Open the cost estimatorEvery number the 3D planner shows comes from a short, transparent set of assumptions. Here they are, so you can judge when to override them.
Floor and ceiling. Width multiplied by length gives floor area; in a simple box room the ceiling is the same. Flooring is shown with your chosen waste allowance added on top, because every floor needs cuts at the edges.
Walls. The perimeter (twice width plus length) multiplied by ceiling height gives gross wall area. We then subtract 1.8 m² for each door (0.9 × 2.0 m) and 1.44 m² for each window (1.2 × 1.2 m) to get the net area that actually takes paint.
Paint. Net wall area × 2 coats ÷ 11 m² per litre. Coverage printed on real tins varies with the product and the surface, so treat this as a starting figure and check the tin you intend to buy.
Tiles and paper. Floor tiles assume 600 × 600 mm with waste added and a result rounded up to whole tiles. Wallpaper assumes a 10.05 × 0.53 m roll, a 10 cm trimming allowance per drop and no pattern repeat — the dedicated guide lets you add one.
Skirting. Perimeter minus 0.9 m for each door opening, plus waste for mitres and offcuts. Lengths are sold in fixed sizes, so round up to whole boards when you order.
Cost. Only shown if you enter your own rate. We deliberately avoid built-in prices: local labour and material costs move too much for a generic figure to be honest.
| Item | Assumption | Where to change it |
|---|---|---|
| Door opening | 0.9 × 2.0 m | Room size guide |
| Window opening | 1.2 × 1.2 m | Room size guide |
| Paint coverage | 11 m² per litre, 2 coats | Paint & wallpaper guide |
| Floor tile | 600 × 600 mm | Flooring & tile guide |
| Waste allowance | 10% (adjustable above) | Materials & waste guide |