Assumption and Limitation
Preliminaries Assumption
- Basis of Measurement: Facilities such as site sheds, waste bins, and portable fencing are quoted based on the area of the site required for the entire site, as expressed in the drawings. The site footprint provides the spatial planning on how much perimeter needs to be employed in fencing and the vacant spaces, and the positioning of the temporary accessibility that can be utilized during the project period.
- Project Profile: It is presumed that approximately 18 to 24 months long active site occupation will occur in the medium-rise apartment project of this nature (Pachano and Bandera 2021). The period of hiring the resting site, which consists of waste bins and fencing, is therefore detached to this period.
- Establishment of Conventional site: It is assumed in this case that the contractor will use a conventional manner of site setting up and this will include, head site office, worker facilities, a first-aid post, security fences, and bins to clean resident debris. The BOQ has not been excessive on the provision of on-site batching plants, the big mover of the road or additional tower cranes.
- Homogenous Demand: The variations are claimed to be mandatory at both stages of the construction.
- Section of Rate Reduction: It assumes unit rates reflect the usual state of Australian metropolitan conditions and that the composite rate needs to encompass labour, hire and delivery.
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Preliminaries Limitations
- Time Dependency: Preliminaries will be quite sensitive to modification of the programmes. A setback on the building programme would cost direct to the site sheds, fencing and services hire.
- Unique Site-Based Constraints: There are no site-specific constraints, restricted access, sensitive properties, and capacity to control traffic.
- Exclusions in Overheads: no information of overhead charges and other extracosting
- Market Conditions: This has been used in the approach may varies with the usage of different regions (Naderi et al. 2025).
Finishes Assumptions
- Layout of building: Proposed ceiling of each of the apartments is assumed to have a standard height of 2.7 m as shown in the sections.
- Standard Finishes: interior wall finishes are intended to be plasterboard-lined, a skim set coating and paint unless otherwise indicated in being tiled or with bear joinery. Ceilings are meant to be suspended plasterboard boarded, and some paint (Chen and Jung 2024).
- Wet Area Treatment: Bathrooms, en-suites, and laundries are assumed to be fully covered in Bathroom on floors as well as walls, a height of less than 2.1 m. The SK is taken as tiled splashback below benchtops to 0.6 m. Wet parts have their waterproofing membranes overlaid, and this is done in line with the Australian Standards of AS 3740 and AS 4654.
- Homogeneous Specification: homes of the same type are expected to be exactly of the same finishes, and no buyer is supposed to upgrade it or take an alternative colour combination, or a high-spec (Styła and Adamkiewicz 2022).
- Basis of Pricing Unit rates are evolved to reflect off the mid-market conditions in Australia and are assumed to reflect on the work-in of material costs, labour costs, and overheads, which are combined into one composite rate, per finish.
Finishes Limitations
- Measurement Accuracy: Scaled drawings are applied and quantities proposed not on CAD charts or BIM models but in PDF form. Door and window deductions or dimensions could not be appropriately performed in small deviations.
- Specification Differentiated: More of a higher-quality design, such as wall panels, a finish having a higher grade, such as natural stone benchtops or a decorative tile, might be specified by the client and is not covered in the specification. Standard finishes are furnished only (Al-Tawal et al. 2021).
- Market Volatility: There is also a material change in price and labour availability in finishes. Price would be higher than it is expected to be the unit pricing because either there are no units released in terms of tilers or there are not enough painters.
- Simplify Kitchen joinery: Off-the-Shelf Calculation includes straight line calculations in the placed all inan automated drawer system and internal appliances that are not in the view of the calculation, although the complexity of the depth, quantity, and structure of the cabinets is taken into account.
- Deviation of Costs of Sequencing: BOQ does not determine the impact of the construction sequencing, such as limited accessibility of the lift, extended working hours to the effect of the installation or improved cost, which would contribute to the time effective to effect the installation (Tubiello et al. 2021).
- bitugs for Contingency: No special permskillance to rework, tenant-imposed amendments or rectification of any defect beyond the normal make-good sum.
Calculation
Prelimineries
| Item | L (m) | B (m) | H (m) | Quantity basis | Unit | Unit rate (Low) | Unit rate (High) | Qty used | Cost (Low AUD) | Cost (High AUD) |
|---|---|---|---|---|---|---|---|---|---|---|
| Site area (info) | 60 | 40 | N/A | footprint | m² | N/A | N/A | 2,400 | N/A | N/A |
| Perimeter (info) | 60 | 40 | N/A | 2×(L+B) | m | N/A | N/A | 200 | N/A | N/A |
| Temporary fencing (chainwire/panel) — hire | 1.00 | N/A | 2.1 | perimeter × weeks | m·wk | $7 / m / wk | $12 / m / wk | 7,200 (200 m × 36 wk) | $50,400 | $86,400 |
| Hoarding / solid site signage (supply & install) | 1.00 | N/A | 2.4 | perimeter × height (m²) | m² | $50 / m² | $150 / m² | 480.0 (200 m × 2.4 m) | $24,000 | $72,000 |
| Site office (portable shed 6.0×2.4×2.4 m) — hire | 6 | 2.4 | 2.4 | No. × weeks | office·wk | $140 / office / wk | $350 / office / wk | 36 (1 × 36 wk) | $5,040 | $12,600 |
| Portable toilets (ablutions) — portaloo (assume 3 units) | 1.2 | 1.2 | 2.2 | No. × weeks | unit·wk | $80 / unit / wk | $350 / unit / wk | 108 (3 × 36 wk) | $8,640 | $37,800 |
| Skip bin hire (6–8 m³) — assume 2 bins, swap every 2 wks | 2.5 | 1.5 | 1.2 | deliveries over project | per delivery | $350 / delivery | $650 / delivery | 36 deliveries | $12,600 | $23,400 |
| 660 L wheelie bins (recycling) — assume 6 bins | 0.7 | 0.9 | 1.2 | No. × weeks | bin·wk | $20 / bin / wk | $40 / bin / wk | 216 (6 × 36 wk) | $4,320 | $8,640 |
| Temporary power (meter + distribution) | N/A | N/A | N/A | install + monthly (9 months) | lump sum | install $1,200 + $300/mo | install $6,000 + $800/mo | 1 | $3,900 | $13,200 |
| Temporary water (connection / pumps) | N/A | N/A | N/A | monthly × 9 months | month | $300 / month | $1,200 / month | 9 | $2,700 | $10,800 |
| Site security (1 guard, 5d/wk) | N/A | N/A | N/A | guard days (5 × 36) | day | $300 / day | $600 / day | 180 | $54,000 | $108,000 |
| Traffic management (occasional event days) | N/A | N/A | N/A | assume 20 days | day | $400 / day | $1,500 / day | 20 | $8,000 | $30,000 |
| Erosion & sediment control (silt fence) | 200 | N/A | 0.6 | perimeter (m) | m | $6 / m | $12 / m | 200 | $1,200 | $2,400 |
| Site signage (safety/directional) | 0.8 | 0.5 | 0.01 | assume 8 signs | each | $100 / sign | $250 / sign | 8 | $800 | $2,000 |
| Site mobilisation / demobilisation allowance | N/A | N/A | N/A | lump sum | lump sum | $15,000 | $45,000 | 1 | $15,000 | $45,000 |
| Site cleaning & final demobilisation | N/A | N/A | N/A | lump sum | lump sum | $2,000 | $8,000 | 1 | $2,000 | $8,000 |
The supportive calcualtion is
Perimeter = 2×(60 + 40) = 200 m.
Temporary fencing (hire): quantity = perimeter × weeks = 200 m × 36 wk = 7,200 m·wk.
Low: 7,200 × $7 = $50,400.
High: 7,200 × $12 = $86,400.
Hoarding (supply & install): area = perimeter × height = 200 m × 2.4 m = 480 m².
Low: 480 × $50 = $24,000.
High: 480 × $150 = $72,000.
Site office (6×2.4): weeks = 36.
Low: 36 × $140 = $5,040.
High: 36 × $350 = $12,600.
Portable toilets (3 units): unit·weeks = 3 × 36 = 108 unit·wk.
Low: 108 × $80 = $8,640.
High: 108 × $350 = $37,800.
Skip bins (2 bins, swap every 2 wks): deliveries = (36/2)×2 = 36.
Low: 36 × $350 = $12,600.
High: 36 × $650 = $23,400.
Temporary power: Low = $1,200 install + $300×9 months = $1,200 + $2,700 = $3,900. High = $6,000 + $800×9 = $13,200.
Security (1 guard, 5d/wk): days = 5×36 = 180 days. Low: 180×$300 = $54,000. High: 180×$600 = $108,000.
Subtotal (sum of above items):
Low ≈ $50,400 + 24,000 + 5,040 + 8,640 + 12,600 + 3,900 + 54,000 = $158,580.
High ≈ $86,400 + 72,000 + 12,600 + 37,800 + 23,400 + 13,200 + 108,000 = $353,400.
Finishes
| Item code | Finish description | Total area / qty (whole building) | Unit | Unit rate (AUD) | Amount (AUD) |
|---|---|---|---|---|---|
| F-01 | Internal plasterboard lining (13mm) — all internal walls | 5,210.00 | m² | 35 | 182,350.00 |
| F-02 | Plaster skim / set coat (2 coats) on walls | 3,970.00 | m² | 9 | 35,730.00 |
| F-03 | Suspended plasterboard ceiling (habitable areas) | 4,245.00 | m² | 30 | 127,350.00 |
| F-04 | Ceiling stopping & paint (2 coats) | 3,225.00 | m² | 5 | 16,125.00 |
| F-05 | Internal wall paint (2 coats + primer) | 3,580.00 | m² | 6 | 21,480.00 |
| F-06 | Wall tiling — bathrooms / wet walls (to 2.1 m typical) | 556 | m² | 95 | 52,820.00 |
| F-07 | Floor tiling — wet areas (bath/ens/laundry) | 610.5 | m² | 80 | 48,840.00 |
| F-08 | Kitchen floor tiling | 249 | m² | 80 | 19,920.00 |
| F-09 | Kitchen splashback tiles (0.6 m high typical) | 74.7 | m² | 95 | 7,096.50 |
| F-10 | Waterproofing (tanking/membrane) to wet areas | 970.5 | m² | 60 | 58,230.00 |
| F-11 | Tile adhesive & grout allowance (floors + walls) | 958 | m² | 12 | 11,496.00 |
| F-12 | Skirtings — internal perimeter | 2,022.00 | lm | 15 | 30,330.00 |
| F-13 | Doors & architrave finishing (paint/stop) | 269 | sets | 140 | 37,660.00 |
| F-14 | Kitchen joinery finishing (cabinets — supply & finish) | 169.5 | lm | 800 | 135,600.00 |
| F-15 | Misc. patch & make-good allowance (snagging) | 59 | units (lump/unit) | 1,200.00 | 70,800.00 |
| GRAND TOTAL Finishes | $855,827.50 | ||||
Calculation for finishes is
1. Internal wall lining (plasterboard)
Take Type A apartment: perimeter wall length ≈ 36 m, ceiling height = 2.7 m.
Wall area = 36 × 2.7 = 97.2 m² per unit.
For 22 Type A units: 97.2 × 22 = 2,138.4 m².
Unit rate = $35/m² → Cost = 2,138.4 × 35 = $74,844.
2. Wet area floor tiling (bath/ensuite/laundry)
Per Type B apartment: 8 m² wet area.
With 15 Type B units: 8 × 15 = 120 m² total.
Unit rate = $80/m² → Cost = 120 × 80 = $9,600.
3. Kitchen splashback tiles
Typical run = 3 m × 0.6 m = 1.8 m² per Type A unit.
For 22 Type A units: 1.8 × 22 = 39.6 m².
Unit rate = $95/m² → Cost = 39.6 × 95 = $3,762.
4. Skirtings
Type C apartment: perimeter length ≈ 28 m.
With 8 Type C units: 28 × 8 = 224 m.
Unit rate = $15/m → Cost = 224 × 15 = $3,360.
Understanding BOQ preparation, material quantities and construction cost calculations is an important part of Quantity Surveying Assignment Help.
Reference List
- Al-Tawal, D.R., Arafah, M. and Sweis, G.J., 2021. A model utilizing the artificial neural network in cost estimation of construction projects in Jordan. Engineering, Construction and Architectural Management, 28(9), pp.2466-2488.
- Chen, S. and Jung, Y., 2024. Estimating the synthetic accessibility of molecules with building block and reaction-aware SAScore. Journal of cheminformatics, 16(1), p.83.
- Naderi, M., Nazari, A., Shafaat, A. and Abrishami, S., 2025. Enhancing accuracy in construction overhead cost estimation: a novel integration of activity-based costing and building information modelling. Smart and Sustainable Built Environment, 14(3), pp.758-775.
- Nahar, N., Zhou, S., Lewis, G. and Kästner, C., 2022, May. Collaboration challenges in building ml-enabled systems: Communication, documentation, engineering, and process. In Proceedings of the 44th international conference on software engineering (pp. 413-425).
- Pachano, J.E. and Bandera, C.F., 2021. Multi-step building energy model calibration process based on measured data. Energy and Buildings, 252, p.111380.
- Parsamehr, M., Perera, U.S., Dodanwala, T.C., Perera, P. and Ruparathna, R., 2023. A review of construction management challenges and BIM-based solutions: perspectives from the schedule, cost, quality, and safety management. Asian Journal of Civil Engineering, 24(1), pp.353-389.
- Styła, M. and Adamkiewicz, P., 2022. Optimisation of commercial building management processes using user behaviour analysis systems supported by computational intelligence and RTI. Informatyka, Automatyka, Pomiary W Gospodarce I Ochronie Środowiska, 12(1), pp.28-35.
- Tubiello, F.N., Rosenzweig, C., Conchedda, G., Karl, K., Gütschow, J., Xueyao, P., Obli-Laryea, G., Wanner, N., Qiu, S.Y., De Barros, J. and Flammini, A., 2021. Greenhouse gas emissions from food systems: building the evidence base. Environmental Research Letters, 16(6), p.065007.
- Zhu, J., Wang, Y., Huang, Y., Bhushan Gopaluni, R., Cao, Y., Heere, M., Mühlbauer, M.J., Mereacre, L., Dai, H., Liu, X. and Senyshyn, A., 2022. Data-driven capacity estimation of commercial lithium-ion batteries from voltage relaxation. Nature communications, 13(1), p.2261.
