External Plaster & Paint Quantity Calculator | G+1 Bungalow 23'x36'

🧱 External Plaster & External Paint – Complete Estimation

Accurate measurement, abstract sheet, and cost calculation for 12mm cement plaster (1:4) and acrylic emulsion exterior paint on a G+1 bungalow (23’×36’, 10’ floor height).

🎨 Types of External Wall Finishes

✅ Rough Cast Plaster ✅ Sand Faced Plaster ✅ Texture Paint ✅ Acrylic Emulsion (Exterior) ✅ Apex / Weatherproof Paint

This sheet uses 12mm thick cement plaster (1:4) and two coats of premium acrylic emulsion with primer & putty.

📏 Measurement Sheet – External Walls (G+1 Bungalow)

Building dimensions: 23’ × 36’ (7.01m × 10.97m) | Floor height: 10’ (3.05m) per floor | Total height (including parapet): 23’ (7.01m)

Description	Length (ft)	Height (ft)	Area (sq.ft)	Area (m²)	Remarks
North wall	36	23	828	76.9	Full height
South wall	36	23	828	76.9	Full height
East wall	23	23	529	49.1	Including gable
West wall	23	23	529	49.1	Including gable
Gross Area			2,714 sq.ft	252.0 m²
Deductions (Openings)
Main Door (6’×7’)			42	3.9
Bedroom Doors (2 nos – 3.5’×7’ each)			49	4.6
Bathroom Doors (2 nos – 2.5’×6.5’ each)			32.5	3.0
Aluminium Windows (total openings)			200	18.6	Based on glass area *1.5
Ventilation (2 nos – 2’×3’ each)			12	1.1
Total Deductions			335.5 sq.ft	31.2 m²
Net Wall Area (Plaster / Paint)			2,378.5 sq.ft	220.8 m²	~221 m²
Add 5% wastage / scaffolding allowance
Final Quantity (with 5% extra)			2,497 sq.ft	232 m²	Recommended order

📌 Calculation formula: Net area = (Perimeter × total height) – (sum of openings).
Perimeter = 2×(23+36)=118 ft. Total height = 20ft (2 floors) + 3ft parapet = 23ft. Gross = 118×23 = 2,714 sq.ft.
Deductions: 335.5 sq.ft → Net = 2,378.5 sq.ft ≈ 221 m². Add 5% wastage = 232 m².

💰 Abstract Sheet – External Plaster & Paint

Plaster rate: ₹210/m² (12mm 1:4 cement mortar – includes material + labour + scaffolding).
Paint rate: ₹65/m² (2 coats acrylic emulsion + primer + putty – includes labour).

Item	Unit	Quantity (m²)	Rate (₹/m²)	Amount (₹)	Remarks
External Plaster (12mm 1:4)	m²	232	210	48,720	Rough + smooth finish
Exterior Primer (1 coat)	m²	232	18	4,176	Included in paint rate below
Exterior Paint (2 coats acrylic emulsion)	m²	232	65	15,080	High quality
Total for External Plaster + Paint				63,800
Additional: Wall putty (if required)				2,500	Optional
Grand Total (incl. putty)				66,300

✅ Note: Rates are indicative for May 2026 (Delhi NCR). For premium texture paint, add ₹40–₹80/m² extra.

📐 Step-by-Step Sample Calculation (for 23’×36’ G+1 Bungalow)

1. Perimeter = 2×(23+36) = 118 ft.
2. Height = 10’ (GF) + 10’ (FF) + 3’ (parapet) = 23 ft.
3. Gross area = 118 × 23 = 2,714 sq.ft.
4. Door & window deductions = 335.5 sq.ft (as per table).
5. Net area = 2,714 – 335.5 = 2,378.5 sq.ft ≈ 221 m².
6. Add 5% wastage = 221 × 1.05 = 232 m² (final quantity).
7. Plaster cost = 232 × ₹210 = ₹48,720.
8. Paint cost = 232 × ₹65 = ₹15,080.
9. Total = ₹63,800. Add putty ₹2,500 → ₹66,300.

🧱 Material Consumption for 232 m² External Plaster (12mm 1:4)

Material	Consumption	Unit
Cement (OPC 53 grade)	1,140 kg	~23 bags (50 kg each)
Sand (coarse)	3.5 m³	~125 cft
Water	As required	–

For paint: 10 litres of primer + 20 litres of emulsion (2 coats) approx.

📖 Relevant Indian Standards (IS Codes)

IS 1200 (Part 5):1982 – Method of measurement of plastering works
IS 15489:2004 – Specification for exterior emulsion paints
IS 15489 (Part 2):2015 – Acrylic exterior paint
IS 1661:1972 – Code of practice for cement plaster
IS 2250:1981 – Code of practice for preparation and application of plaster

❓ Top 10 FAQs – External Plaster & Paint

1. What is the standard thickness for external plaster?
Generally 12mm to 15mm. 12mm is used for brick walls, 15mm for rough surfaces.

2. What is the best cement-sand ratio for external plaster?
1:4 (cement:sand) is recommended for external walls exposed to rain and sun.

3. How is plaster area measured as per IS 1200?
Measure the gross area of the wall and deduct openings larger than 0.5 m². No deduction for small openings like pipes.

4. What is the difference between internal and external plaster?
External plaster is thicker, uses richer mix (1:4 or 1:5), and often includes water repellent.

5. Which paint is best for exterior walls?
Acrylic emulsion (100% acrylic) or silicone-based paints are durable. Brands like Asian Apex, Berger WeatherCoat, or Nerolac Excel.

6. Do I need to apply primer before exterior paint?
Yes, primer is essential for adhesion and to prevent alkali attack from fresh plaster.

7. How much area does 1 litre of exterior paint cover?
Approx 10–12 m² per litre for one coat, depending on porosity.

8. What is the typical labour rate for external plaster?
Labour ₹60–₹90 per m² depending on city and finish. Our rate ₹210 includes labour + material.

9. How do I treat cracks before painting?
Use crack filler putty or cement slurry with polymer. Deep cracks require chipping and re-plastering.

10. Can I use the same paint for terrace and walls?
No. Terrace requires waterproofing coating (PU or bituminous). Exterior wall paint is not meant for standing water.