Rate Analysis for Plastering Work — Cost per Sq Ft and Sq Metre

Introduction

Plastering is one of the largest finishing items in any building project. For a typical 1000 sq ft house, the total plastering area (all internal walls, external walls, and ceilings) can easily exceed 4000-5000 sq ft. At Rs 3-8 per sq ft, that is a Rs 15,000-40,000 line item — enough to affect your profit if you estimate it poorly.

This guide gives you a complete rate analysis for plastering work — material quantities, labour charges, tool costs, and total rate per square foot and square metre. We cover both 12mm internal and 20mm external plastering with 2026 Indian market prices.

Plastering Basics

Thickness Standards

Application	Thickness	Mortar Ratio	Coats
Internal walls	12 mm	1:6	Single coat
Internal walls (premium)	15 mm	1:6	Two coats (10mm + 5mm)
External walls	20 mm	1:4	Two coats (15mm + 5mm)
Ceiling	6-8 mm	1:4	Single coat
Dado (bathroom)	12 mm	1:4	Single coat (with waterproofing)

Why Different Ratios?

1:6 for internal plaster — internal walls are protected from rain and extreme temperatures. A leaner mix (less cement) is sufficient and more economical.

1:4 for external plaster — external walls face rain, sun, heat, and cold cycles. A richer mix (more cement) provides better weather resistance, reduced water absorption, and higher durability.

Rate Analysis: 12mm Internal Plastering (1:6)

Let us calculate the rate for 1 square metre of 12mm thick internal plaster in 1:6 cement mortar.

Step 1: Material Quantity

Wet volume of plaster per sq m: = area x thickness = 1 x 0.012 = 0.012 cum

Dry volume (with 1.33 factor + 20% extra for uneven surface): = 0.012 x 1.33 x 1.20 = 0.01915 cum

We round to 0.0192 cum of dry mortar materials per sq m.

Cement quantity:

• Ratio = 1:6, total parts = 7
• Cement = (1/7) x 0.0192 = 0.00274 cum
• In bags = 0.00274 / 0.0347 = 0.079 bags per sq m
• In kg = 0.079 x 50 = 3.95 kg per sq m

Sand quantity:

• Sand = (6/7) x 0.0192 = 0.01646 cum per sq m

Water:

• Approximately 4-5 litres per sq m for mixing and curing

Step 2: Material Cost (2026 Rates)

Material	Quantity per Sq M	Rate	Cost per Sq M
Cement	0.079 bags (3.95 kg)	Rs 400/bag	Rs 31.60
Sand	0.01646 cum	Rs 2,400/cum	Rs 39.50
Water	5 litres	Rs 1/litre	Rs 5.00
Material total			Rs 76.10

Step 3: Labour Cost

Labour Item	Rate per Sq M
Mason (plastering)	Rs 12-18
Helper/mazdoor	Rs 6-10
Labour total	Rs 18-28

Average labour rate for internal plastering: Rs 22 per sq m in tier-1 cities.

Step 4: Sundry Charges

Item	Rate per Sq M
Scaffolding (internal, minimal)	Rs 2-3
Tools and tackles	Rs 1-2
Curing (water + labour for 7 days)	Rs 3-5
Wastage and contingency (5%)	Rs 5
Sundry total	Rs 11-15

Step 5: Total Rate — 12mm Internal Plaster

Component	Cost per Sq M	Cost per Sq Ft
Materials	Rs 76.10	Rs 7.07
Labour	Rs 22.00	Rs 2.04
Sundries	Rs 13.00	Rs 1.21
Total	Rs 111.10	Rs 10.32

Add contractor overhead and profit (10-15%): = Rs 111 x 1.12 = Rs 124 per sq m or approximately Rs 11.50 per sq ft

Rate Analysis: 20mm External Plastering (1:4)

Now let us calculate the rate for 1 square metre of 20mm thick external plaster in 1:4 cement mortar (two coats).

Step 1: Material Quantity

Wet volume of plaster per sq m: = 1 x 0.020 = 0.020 cum

Dry volume (with 1.33 factor + 25% extra for rough external surface): = 0.020 x 1.33 x 1.25 = 0.03325 cum

Cement quantity:

• Ratio = 1:4, total parts = 5
• Cement = (1/5) x 0.03325 = 0.00665 cum
• In bags = 0.00665 / 0.0347 = 0.192 bags per sq m
• In kg = 0.192 x 50 = 9.58 kg per sq m

Sand quantity:

• Sand = (4/5) x 0.03325 = 0.0266 cum per sq m

Step 2: Material Cost

Material	Quantity per Sq M	Rate	Cost per Sq M
Cement	0.192 bags (9.58 kg)	Rs 400/bag	Rs 76.80
Sand	0.0266 cum	Rs 2,400/cum	Rs 63.84
Water	7-8 litres	Rs 1/litre	Rs 8.00
Material total			Rs 148.64

Step 3: Labour Cost

Labour Item	Rate per Sq M
Mason (external, two coats)	Rs 18-25
Helper/mazdoor	Rs 8-12
Labour total	Rs 26-37

Average labour rate for external plastering: Rs 30 per sq m (higher due to two coats, scaffolding work, and rough finish).

Step 4: Sundry Charges

Item	Rate per Sq M
Scaffolding (external, substantial)	Rs 8-15
Tools and tackles	Rs 2-3
Curing (7 days, external)	Rs 5-8
Wastage and contingency (8%)	Rs 12
Sundry total	Rs 27-38

Step 5: Total Rate — 20mm External Plaster

Component	Cost per Sq M	Cost per Sq Ft
Materials	Rs 148.64	Rs 13.81
Labour	Rs 30.00	Rs 2.79
Sundries	Rs 32.00	Rs 2.97
Total	Rs 210.64	Rs 19.57

Add contractor overhead and profit (10-15%): = Rs 211 x 1.12 = Rs 236 per sq m or approximately Rs 21.90 per sq ft

Comparison: Internal vs External Plastering

Parameter	Internal (12mm, 1:6)	External (20mm, 1:4)
Thickness	12 mm	20 mm
Mortar ratio	1:6	1:4
Cement per sq m	3.95 kg (0.079 bags)	9.58 kg (0.192 bags)
Sand per sq m	0.0165 cum	0.0266 cum
Material cost/sq m	Rs 76	Rs 149
Labour cost/sq m	Rs 22	Rs 30
Total cost/sq m	Rs 111	Rs 211
Total cost/sq ft	Rs 10.32	Rs 19.57

External plaster costs roughly 1.9 times more than internal plaster due to the thicker application, richer mortar, scaffolding, and additional labour.

City-Wise Plastering Rates (2026)

Rates vary significantly across Indian cities:

City	Internal Plaster (per sq ft)	External Plaster (per sq ft)
Mumbai	Rs 12-15	Rs 22-28
Delhi	Rs 10-13	Rs 18-24
Bangalore	Rs 11-14	Rs 20-26
Pune	Rs 10-13	Rs 18-23
Ahmedabad	Rs 8-11	Rs 16-20
Kolkata	Rs 8-11	Rs 15-20

Mumbai and Bangalore are the most expensive due to higher labour rates and sand costs. Tier-2 cities like Indore, Lucknow, and Jaipur are typically 15-20% cheaper.

Plastering Cost for a Typical House

For a 1000 sq ft (2 BHK) single-floor house, the approximate plastering areas are:

Surface	Area (sq m)	Type	Rate (per sq m)	Cost
Internal walls	250 sq m	12mm, 1:6	Rs 111	Rs 27,750
External walls	100 sq m	20mm, 1:4	Rs 211	Rs 21,100
Ceiling	93 sq m	8mm, 1:4	Rs 140	Rs 13,020
Total	443 sq m			Rs 61,870

Add 12% for contractor overhead: approximately Rs 69,300 for complete plastering of a 1000 sq ft house.

Tips to Reduce Plastering Cost

1. Ensure Level Brickwork

Uneven brick walls require extra plaster thickness (sometimes 25-30mm instead of 12mm). Good brickwork saves 15-20% on plaster materials.

2. Use Fly Ash Bricks

Fly ash bricks have better dimensional uniformity than red bricks. This means more even walls, thinner plaster, and less wastage.

3. Consider Gypsum for Interiors

Gypsum plaster at Rs 45-65 per sq m is only slightly costlier than cement plaster but saves 7 days of curing time and labour. For projects where time is money, gypsum can be more economical overall.

4. Bulk Sand Purchase

Buy sand in bulk (per truck load) rather than small quantities. A full truck (3-4 cum) costs 10-15% less per cum than buying in smaller lots.

5. Proper Curing

Under-cured plaster cracks and needs rework. Seven days of curing costs Rs 3-5 per sq m in water and labour but saves Rs 30-50 per sq m in crack repair.

Use Yojo Calculators

The Yojo Plaster Material Estimator lets you enter wall dimensions, plaster thickness, and mortar ratio to get exact cement and sand quantities with cost estimates.

For cement quantity across multiple items (brickwork + plastering + concrete), use the Cement Calculator to consolidate your order.

Use our free calculators to get accurate material estimates before placing your order.

Summary

Rate analysis for plastering work depends on four factors: thickness, mortar ratio, labour rates, and city. Here are the key numbers:

• 12mm internal plaster (1:6): Rs 110-125 per sq m or Rs 10-12 per sq ft
• 20mm external plaster (1:4): Rs 210-240 per sq m or Rs 20-22 per sq ft
• Cement consumption: 0.08 bags/sq m (internal) vs 0.19 bags/sq m (external)
• External plaster costs roughly 2x internal plaster

For a 1000 sq ft house, budget approximately Rs 60,000-70,000 for complete plastering including all surfaces, labour, scaffolding, and curing.