Civil Engineering Billing Guide: BOQ Preparation Step by Step and Quantity Estimation from Drawing
Advance your proficiency in construction field documentation with this practical guide. Master structural material computations and assemble verifiable, real-world Bills of Quantities (BOQ) for plastering, structural tiling, premium painting layouts, and custom stone counter surfaces based on verified G+1 engineering blueprints (23′-0″ × 36′-6″).
📖 Essential Site Glossary (Short Reference)
| Perimeter | Total linear length of all walls in a room. |
|---|---|
| Deduction | Void area (doors/windows) subtracted from gross wall area. |
| Dado Tiling | Vertical wall tiles in wet areas & kitchen backsplash. |
| Skirting | 100mm high tile strip at wall base. |
| Nosing | Polished front edge of a granite countertop. |
| IS 1200 | Indian Standard measurement code for civil works. |
📍 1. Structural Flooring Optimization & Plan Room Analysis
📋 Ground Floor Extracted Areas
| Room | Dimensions (ft) | Area (m²) | Finish |
|---|---|---|---|
| Drawing Hall | 11’6″ x 17’3″ | 18.43 | Premium Vitrified |
| Kitchen/Dining | 9’6″ x 15’6″ | 13.68 | Anti-skid |
| Bed Room | 10’0″ x 12’6″ | 11.61 | Vitrified |
| Store Room | 9’9″ x 5’0″ | 4.53 | Ceramic |
| Bath + WC | Combined | 3.90 | Anti-skid |
| Passage | 3’6″ x 9’6″ | 3.09 | Vitrified |
🧮 Calculation Method (m²)
11’6″ = 3.505 m | 17’3″ = 5.258 m
→ 3.505 × 5.258 = 18.43 m²
🧱 2. Linear Skirting Rules & Vertical Dado Configurations
📋 Skirting & Dado Reference Quantities
| Location / Item | Perimeter/Length (m) | Door Deduction | Net Qty | Unit |
|---|---|---|---|---|
| Bed Room Skirting | 13.72 | 0.91 | 12.81 | m |
| Drawing Hall Skirting | 18.50 | 1.07 | 17.43 | m |
| Bath Dado (Full) | 6.71 | — | 14.29 | m² |
| Kitchen Dado (backsplash) | 3.50 (L) | — | 2.14 | m² |
📐 Calculation Steps
L=3.05m, W=3.81m → Perimeter = 13.72m
Door width = 0.91m → Net = 13.72 – 0.91 = 12.81 m
Kitchen backsplash: Counter length 3.5m × 0.61m = 2.14 m²
🚪 3. Openings Deduction Logic for Plastering and Painting Work
📋 Structural Openings Schedule
| Opening | Size (m) | Area (m²) | Qty | Total Deduction |
|---|---|---|---|---|
| Main Door (D) | 1.07×2.21 | 2.36 | 1 | 2.36 |
| Drawing Hall Window | 1.37×1.52 | 2.08 | 1 | 2.08 |
| Bed Door (D1) | 0.91×2.21 | 2.01 | 1 | 2.01 |
| Kitchen Door (D2) | 0.91×2.21 | 2.01 | 1 | 2.01 |
| Bed Window (W3) | 1.37×1.22 | 1.67 | 2 | 3.34 |
🧮 Net Plaster Calculation
Gross wall = 13.72m × 3.05m = 41.85 m²
Deductions = Door(2.01) + Window1(1.67) + Window2(1.67) = 5.35 m²
Net Plaster = 41.85 – 5.35 = 38.17 m²
🍳 4. Dual-Unit Calculations for Polished Granite Countertops
📋 Kitchen Platform (GF Example)
| Description | Length (m) | Width (m) | Quantity | Unit |
|---|---|---|---|---|
| Granite platform top | 3.66 | 0.61 | 2.23 | m² |
| Polished nosing (bullnose) | 3.66 | — | 3.66 | m |
📏 Calculation Method
Length = 3.66 m → Top area = 3.66 × 0.61 = 2.23 m²
Nosing length = 3.66 metres
📋 Comprehensive Wall Plaster & Paint Measurement Sheet
| Room / Zone | Gross Wall (m²) | Deduction (m²) | Net Plaster (m²) | Ceiling (m²) |
|---|---|---|---|---|
| Drawing Hall | 78.50 | 8.90 | 69.60 | 18.43 |
| Kitchen/Dining | 62.40 | 6.45 | 55.95 | 13.68 |
| Bed Room | 41.85 | 3.68 | 38.17 | 11.61 |
| Bath + WC (Base) | 28.40 | 2.24 | 26.16 | 3.90 |
| Store Room | 25.30 | 2.57 | 22.73 | 4.53 |
| Passage | 24.60 | 0.00 | 24.60 | 3.09 |
| TOTAL (GF) | ~261.05 | ~23.84 | ~237.21 | 55.24 |
📊 Final BOQ Abstract: Finishing Works (G+1 Project) of Ground floor
| Item Description | Total Qty (Ground Floor) | Rate (₹) | Total Cost (₹) |
|---|---|---|---|
| Internal Wall Plastering (Excluding wet area walls) | 211.05 m² | 135 | 28,491.75 |
| Vitrified Tile Flooring (Bed, Hall, Kitchen, Store, Passage) | 51.34 m² | 450 | 23,103.00 |
| Dado Tiling (Bath + WC full height walls) | 24.02 m² | 520 | 12,490.40 |
| Acrylic Emulsion Wall Painting | 211.05 m² | 42 | 8,864.10 |
| Wall Putty + Primer Application Base | 211.05 m² | 38 | 8,019.90 |
| Ceiling Plastering Work | 55.24 m² | 95 | 5,247.80 |
| Premium Granite Flooring (Balconies / Otla) | 6.69 m² | 750 | 5,017.50 |
| Skirting Tiling Work (Bed, Hall, Store) | 39.13 m | 85 | 3,326.05 |
| Ceiling Painting Work | 55.24 m² | 28 | 1,546.72 |
| Anti-Skid Floor Tiling (Bath + WC) | 3.90 m² | 380 | 1,482.00 |
| Kitchen Dado Tiling (Counter Backsplash) | 2.14 m² | 520 | 1,112.80 |
| Granite Kitchen Platform Top | 2.23 m² | 1,850 | 4,125.50 |
| Polished Front Edge Nosing | 3.66 m | 175 | 640.50 |
| 💰 GRAND TOTAL (Ground Floor) | ₹1,03,468.52 |
📌 Quick Reference Cheat Sheet
- Flooring (m²): Length × Width
- Skirting (m): (2 × [L+W]) – Σ(Door openings)
- Net Plaster (m²): (Perimeter × Height) – Openings schedule (0.5–3 m² full deduction)
- Kitchen Top (m²): Length × 0.61 m
- Nosing (m): Countertop edge length
❓ Technical Frequently Asked Questions
1. What baseline standard governs open area volume deductions for finishing works?
Per Indian Standard IS 1200 parameters, architectural window and entry openings measuring between 0.5 and 3.0 square meters require full individual structural face reductions across internal wall surface calculations to minimize inventory tracking variance.
2. Why are base tile flooring and wall border skirting evaluated using independent metric indicators?
Flooring covers internal horizontal space dimensions evaluated by overall area footprint (m²). Wall perimeter base border masking (skirting) operates lineally (meters) and functions separately to exclude intersecting wall openings from physical cost aggregates.
3. How should stone platform edge finishing be handled to maintain billing compliance?
Slab surface counters are initially tallied using localized area limits (m²). The exposed perimeter face requires distinct manually-intensive polishing edge-work (nosing), requiring separate linear item tracking classifications under primary DSR schedules.
4. What design configuration serves as the dimension baseline for residential counter estimates?
Standard engineering practices standardize integrated counter installations to a fixed width alignment coefficient of 0.61 meters (2 feet), enabling accurate face length multiplications during planning phases.
5. How do you scale multi-tier property costs reliably from ground-level calculation metrics?
For matching overhead construction tiers, individual room finishing metrics can be scaled exponentially across shared levels. Fixed specialized non-repeating layouts—including localized ground culinary countertops—are accounted for separately within the abstract matrix.