Facade Calculation: Area, ETICS Materials and Quantities
How do you calculate a facade? Work out the net wall area, multiply it by the consumption of each ETICS layer and round up to whole packs. Here are the steps, a table per m² and a worked example.
Step 1: Calculate the facade area
Area = walls (perimeter × height) + gables (base × height ÷ 2) − windows and doors. Example: a house with a 36 m perimeter and 5.5 m wall height gives 36 × 5.5 = 198 m². Two gables of 8 m × 2.5 m ÷ 2 = 10 m² each add 20 m². Openings of 18 m² are subtracted: 198 + 20 − 18 = 200 m².
Step 2: Material consumption per m²
These are the values the calculator uses for an ETICS system with EPS boards. They are indicative, so follow your system manufacturer's data sheets.
| Material | Per m² | For 100 m² |
|---|---|---|
| EPS adhesive | 5 kg | 500 kg |
| EPS insulation | 1.05 m² | 105 m² |
| Insulation anchors | 6 pcs | 600 pcs |
| Reinforcement mesh | 1.1 m² | 110 m² |
| Mesh adhesive | 5.5 kg | 550 kg |
| Quartz primer | 0.2 kg | 20 kg |
| Finish plaster | 2.5 kg | 250 kg |
| Corner profile with mesh | 0.4 m | 40 m |
| Window profile | 0.3 m | 30 m |
| Drip profile | 0.15 m | 15 m |
Step 3: Worked example for 200 m²
EPS boards 1.05 × 200 = 210 m². Board adhesive 5 × 200 = 1000 kg = 40 bags of 25 kg. Anchors 6 × 200 = 1200 pcs = 12 boxes of 100. Mesh 1.1 × 200 = 220 m² = 5 rolls of 50 m². Mesh adhesive 5.5 × 200 = 1100 kg = 44 bags. Primer 0.2 × 200 = 40 kg = 2 buckets. Finish plaster 2.5 × 200 = 500 kg = 20 buckets of 25 kg.
What the price depends on
Multiply each quantity by your supplier's price, then add scaffolding and labour. The calculator does not estimate a price, because it depends on the product, the region and the workers.
What changes the quantities
- Uneven walls need more adhesive and produce more cutting waste.
- Many windows, corners and edges need more profiles and anchors.
- Wind load and building height can require more anchors.
- The manufacturer's system sets the exact consumption and build-up.
Common mistakes
- Forgetting the gables when measuring the area.
- Subtracting the openings but forgetting the profiles around them.
- Skipping profiles at corners, windows and the base.
- Applying the finish plaster without primer on the base coat.
- Buying exactly the calculated quantity with no reserve for cutting.
Frequently asked questions
How do you calculate the area of a facade?
Multiply the length of each wall by its height, add the gables (base × height ÷ 2) and subtract windows and doors.
How much adhesive for 100 m² of EPS boards?
About 500 kg (5 kg/m²), which is 20 bags of 25 kg. The mesh layer needs another 550 kg.
How much does a facade cost?
Multiply the calculated quantities by your supplier's prices and add scaffolding and labour. The calculator only calculates quantities.
Open the calculator: Facade (EIFS)