---
title: "Rate analysis: 20 mm plaster 1:4 per 100 m²"
subject: "Estimating and Costing"
chapter: 4
key: "semester_7/estimating_and_costing:rate-plaster-20mm-1-4"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/rate-plaster-20mm-1-4
site: BCT Engineering
---

# Rate analysis: 20 mm plaster 1:4 per 100 m²

Estimating and Costing · Chapter 4: Analysis of Rates

- Asked in: 2071 Chaitra, 6 marks
- Video: [Rate Analysis of Plaster Work | Analysis of Rate for Plaster Work @CivilConstruction](https://www.youtube.com/watch?v=n8qR8FVY8Sw) — CivilConstruction
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/rate-plaster-20mm-1-4
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-4

## Question

Prepare rate analysis for 20 mm thick cement sand plaster (1:4) in wall per 100 m².

## Short answer

For 100 m² of 20 mm wall plaster (1:4), dry mortar 2.54 m³ provides 14.63 bags cement and 2.032 m³ sand. Including labour and 15% overhead + 10% profit, rate = NPR 64,677.50 per 100 m² (646.78/m²).

## Answer

Rates and labour norms below are illustrative (DUDBC-style norms; use the current District Rate and norms of the project area for a real estimate): cement NPR 1,000/bag, sand NPR 3,500/m³, 20 mm aggregate NPR 4,500/m³, skilled labour NPR 1,500/day, unskilled labour NPR 1,100/day, water lump sum, contractor's overhead 15% and profit 10% on direct cost (VAT excluded).

#### Quantities per 100 m²

- Wet mortar $= 100 \times 0.02 = 2.00$ m³; dry $= 1.27 \times 2.00 = 2.540$ m³
- Cement $= 1/5 \times 2.540 = 0.5080$ m³ $= 14.63$ bags; sand $= 4/5 \times 2.540 = 2.032$ m³
- Labour (assumed norm for a 20 mm two-coat plaster): mason 10 days, labourer 12 days per 100 m².

#### Analysis

| Item | Qty | Unit | Rate (NPR) | Amount (NPR) |
|---|---:|---|---:|---:|
| Cement | 14.63 | bag | 1,000.00 | 14,630.00 |
| Sand | 2.032 | m³ | 3,500.00 | 7,112.00 |
| Skilled labour (mason) | 10.0 | day | 1,500.00 | 15,000.00 |
| Unskilled labour | 12.0 | day | 1,100.00 | 13,200.00 |
| Scaffolding, water and curing (lump) | 1 | LS | 1,800.00 | 1,800.00 |
| **Direct cost** | | | | **51,742.00** |
| Contractor's overhead @ 15% | | | | 7,761.30 |
| Contractor's profit @ 10% | | | | 5,174.20 |
| **Total (rate per 100 m²)** | | | | **64,677.50** |

**Rate = NPR 64,677.50 per 100 m²** (NPR 646.78 per m²).

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Wet mortar per 100 m^2?
   A. 1.25
   B. 2.54
   C. 2.00 m^3
   D. 0.2
   Answer: C. 100 x 0.02. (Key point: Wet mortar)

2. Cement?
   A. 1/4 x 2.54
   B. 1/5 x 2.540 = 0.508 m^3 = 14.63 bags
   C. 1/5 x 2.0
   D. 4/5 x 2.54
   Answer: B. Sum 5. (Key point: Cement)

3. Labour?
   A. Mason 10, labourer 12 days
   B. Mason 8, 10
   C. Mason 12, 10
   D. Mason 1, 1
   Answer: A. Two-coat. (Key point: Labour)

4. Per m^2?
   A. NPR 6,467.75
   B. NPR 517.42
   C. NPR 64.68
   D. NPR 646.77
   Answer: D. Divide by 100. (Key point: Rate)

## Close variants set in other exams

- [Rate analysis: 12.5 mm plaster 1:5, per m²](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Arate-plaster-12-5-1-5) — Estimating and Costing, chapter 4, asked 3×
- [Rate analysis: 12 mm plaster 1:3 ceiling](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Arate-plaster-12mm-1-3-ceiling) — Estimating and Costing, chapter 4, asked 3×

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- [Rate analysis: 12.5 mm plaster 1:3, per 100 m²](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Arate-plaster-12-5-1-3-ceiling) — Estimating and Costing, chapter 4
- [Materials: 12 mm plaster 1:6 per 10 m²](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Amaterials-plaster-12mm-1-6) — Estimating and Costing, chapter 4
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- [Rate analysis: 25 mm premix carpeting](https://www.bctengineer.com/question.md?key=semester_7%2Festimating_and_costing%3Arate-premix-carpeting-25mm) — Estimating and Costing, chapter 4

## Related in other subjects

- [Cement and sand for 100 m² plastering numerical](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Aplaster-100m2-1to6) — Building Technology, chapter 3, asked 2×
- [Brick and mortar for 230 mm wall (100 kN/m)](https://www.bctengineer.com/question.md?key=semester_5%2Fconcrete_technology_and_masonry_structure%3Awall-eccentric-230mm-100kn-5m) — Concrete Technology and Masonry Structure, chapter 8, asked 7×
- [Detailed specification of cement plaster 1:4](https://www.bctengineer.com/question.md?key=semester_8%2Fconstruction_management%3Adetailed-spec-plaster-1-4) — Construction Management, chapter 12