External render (sand and cement or monocouche): calculator for UK builders
Answer the measurements this calculation needs and JobBosh works out the materials with wastage and pack rounding, the labour hours by role, the plant, the waste and the site needs - then prices them from your own figures, a supplier's quotation or a dated price you record. Free, no account needed to start.
What it works out
- Material: Rendering sand (bulk bag); Cement (25 kg); Render waterproofer / plasticiser; Render beads (stop, angle, bell)
- Labour: Apply render (two coats / monocouche) incl. beads
The questions it asks
| Question | Unit / choices | Required? | Help |
|---|---|---|---|
| Wall area to render | m2 | required | |
| Render system | one of: sand cement two coat, monocouche | optional - default sand_cement_two_coat (labelled assumed) | |
| Hack off existing render first? | yes / no | optional - default no (labelled assumed) | |
| Storeys | nr | optional - default 1 (labelled assumed) |
The norms behind it, with their sources
Coverage, productivity and wastage defaults you can edit; each carries where it comes from and is shown as assumed until your own benchmark replaces it.
| Norm | Value | Source | Tier |
|---|---|---|---|
| Sand:cement render per m2 at ~20 mm two coats (mixed weight) | 40 kg/m2 | trade practice | assumed |
| Monocouche render per m2 at ~15 mm | 28 kg/m2 | typical manufacturer figure | assumed |
| Stop / angle / bell beads per m2 | 0.6 m/m2 | trade practice | assumed |
| Two-coat render per m2 incl. beads | 0.6 hr/m2 | trade practice | assumed |
| Hack off and clear per m2 | 0.4 hr/m2 | trade practice | assumed |
| Render rubble per m2 | 0.025 m3/m2 | trade practice | assumed |
A worked example
Answers used: Wall area to render 20 m2; Render system sand cement two coat; Hack off existing render first? no; Storeys 1 nr. These are the recipe's own quantities for those answers - the prices are yours, the supplier's or a quotation's, never a figure typed on a web page.
| Kind | Line | Quantity | How it is worked out |
|---|---|---|---|
| material | Rendering sand (bulk bag) | 684.8 kg 1 x bag - bulk bag ~800 kg | 20 m2 x 40 kg/m2 x 80 % sand |
| material | Cement (25 kg) | 171.2 kg 7 x bag - 25 kg bags | 20 m2 x 40 kg/m2 x 20 % cement |
| material | Render waterproofer / plasticiser | 0.5 L 1 x tin - 5 L | 20 m2 / 40 m2 per litre |
| material | Render beads (stop, angle, bell) | 13.2 m 6 x length - 2.5 m lengths | 20 m2 x 0.6 m/m2 |
| labour | Apply render (two coats / monocouche) incl. beads | 12 hr | 20 m2 x 0.6 h/m2 |
Labour on this example: about 12 hours across the roles; at your rates it becomes money.
Site questions this work raises: Access equipment and temporary works, Parking and traffic, Waste, Protection and cleanliness.
Render needs frost-free weather for curing; programme accordingly.
Then what
Price the lines from your crew rates and your material prices (each with its source and date), answer the site questions (parking, skip, welfare, power, water, protection), let JobBosh draft the supplier enquiries you approve, and issue a branded quotation your customer accepts on a secure link. Guest work is kept for 14 days; a free account keeps it for good.
Start a external render (sand and cement or monocouche) job now