Detailed Cost Estimation for a Two-Story Building Construction Project

This assignment provides a detailed cost estimation for a two-story brick veneer building located in Penrith, focusing on the lock-up stage of construction. The analysis includes cost breakdowns for tiling (floor and wall), plumbing (fixtures and fittings), electrical works (fixtures and wiring), woodwork (shelves and joineries), ceiling installation, and painting. The assignment provides a bill of quantities for each trade, including material quantities, unit rates, and calculated amounts. Furthermore, it presents a summary of estimated costs, incorporating builder's margin and GST. Part B of the assignment delves into preliminary costs, detailing expenses such as drawings, site access, consultant fees, authorities fees, project supervision, and various site-related costs. It provides a table with a comprehensive list of preliminary items, their quantities, rates, and calculated amounts, which also includes builder's margin and GST, providing a comprehensive overview of the total project cost.

Building and Construction Cost Estimation 1
BUILDING AND CONSTRUCTION COST ESTIMATION
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Building and Construction Cost Estimation 2
Building and Construction Cost Estimation
1. PART A
Cost estimation is very crucial in all construction projects as it provides vital information to the
client and contractor regarding financial requirements of the project (Chan, 2012); (Elfaki,
Alatawi, & Abushandi, 2014). The cost estimation in this task is for the following rooms: powder
room, laundry, ensuite and bathroom of the two story brick veneer building at Penrith in Project
1. The dimensions of these rooms are as follows:
Powder room: 1800 mm by 1900 mm
Laundry: 2090mm by 3010mm
Ensuite: 3400mm by 1500mm + 900mm by 1520mm
Bathroom: 3260mm by 3030mm
It is important to note that the project is at lock up stage and therefore most of the trades in this
task are finishing and appliance or fixture installation works.
The following are the key trades included in the bill of quantities:
1.1. Tiling
This involves supply and installation of tiles on floors and walls of the rooms. Specifications of
tiles to be installed are provided in the contract documents
Ceramic floor tiles:
Entire floor area of these rooms is covered with ceramic tiles

Building and Construction Cost Estimation 3
Total floor area = (1.8m x 1.9m) + (2.09m x 3.01m) + [(3.4m x 1.5m) + (0.9m x 1.52m)] +
(3.26m x 3.03m)
= 3.42m2 + 6.2909m2 + 5.1m2 + 1.368m2 + 9.8778m2 = 26.0567m2 = 26.06m2
Plus 10% wastage = 26.06 m2+ 10
100 x 26.06 m2=26.06+2.606=28.666 m2=29 m2
Ceramic wall tiles:
Half the height of wall in these rooms is covered with ceramic tiles
Total wall height = 2.45m; half the wall height = 0.5 x 2.45m = 1.225m
Total wall length: [1.8m + (2 x 1.9m) + 0.9m] + [(2 x 2.09m) + (2 x 3.01m)] + [(2 x 3.4m) +
2.4m + 1.73m] + [(2 x 3.03m) + 3.26m + 2.44m]
= 6.5m + 10.2m + 10.93m + 11.76m = 39.39m
Total wall area = 39.39m x 1.225m = 48.25m2
Plus 10% wastage = 48.25 m2 + 10
100 x 48.25 m2=48.25+4.825=53.075 m2=53 m2
1.2. Plumbing
This involves supply and installation of toilet suites, shower bases, vanities, tub, bath, tap ware
and fittings in the rooms. Specifications of each of the above mentioned items are provided in the
contract documents.

Building and Construction Cost Estimation 4
1.3. Electrical works
This involves supply and installation of electrical fixtures, such as lighting fittings, switches and
lighting points, SWA/PVC copper cables, meter board and earthing. It also includes electrical
wiring. Specifications of the electrical works are provided in the contract documents.
1.4. Woodwork
This involves supply and installation of shelves and joineries, and plasterboard cornices.
Specifications of the woodwork products and installation requirements are provided in the
contract documents.
1.5. Ceiling
This involves supply and installation of ceiling in the rooms. Specifications of the ceilings are
provided in the contract documents.
Entire roof area of the rooms on the first floor is covered with gypsum plasterboard ceilings
Total roof area on first floor = [(3.4m x 1.5m) + (0.9m x 1.52m)] + (3.26m x 3.03m)
= 5.1m2 + 1.368m2 + 9.8778m2 = 16.3458m2 = 16.352
Plus 10% wastage = 16.35 m2+ 10
100 x 16.35 m2=16.35+ 1.635=17.985 m2=18 m2
1.6. Painting
This involves painting specific areas of the rooms. Specifications of the paints and painting
procedures are provided in the contract documents.
The untiled walls and roof of the ground floor shall be painted.
Total wall and roof area to be painted (including 10% waste) = 53m2 + 18m2 = 71m2

Building and Construction Cost Estimation 5
The bill of quantities for the above trades is provided in Table 1 below
Table 1: Bill of quantities
Item Description Qty Unit Rate
($)
Amount
($)
1 Tiling
1.1 Ceramic floor tiles
22mm thick cement and sand (1:4) screed/mortar to receive
ceramic floor tiles
29 M2 5 145
300x300x8mm thick approved non-slip ceramic tiles fixed
using adhesive on prepared screed on floors
29 M2 40 1,160
100mm high skirting 44 M 4 176
Labour 10 Hours 50 500
1.2 Ceramic wall tiles
12mm thick cement and sand (1:4) backing to receive
ceramic wall tiles
53 M2 5 265
300x300x8mm thick approved non-slip ceramic tiles fixed
using adhesive on prepared screed on floors
53 M2 30 1,590
Labour – ceramic tilers 20 Hours 50 1,000
Total for tiling carried to summary 4,836
2 Plumbing
2.1 Toilet suites
Wall faced, ultra-quiet toilet suites 2 No 600 1,200
2.2 Shower bases
Supply 900 x 900mm, 1500 x 920mm and 1200 x 1200mm
shower bases
3 No 500 1,500
2.3 Vanity 600 wide
Vanity 600 wide vanity for powder room 1 No 350 350
2.4 Vanity 1200 wide
1200 wide vanity to be installed in ensuite and bathroom 2 No 600 1,200
2.5 Tub
Tub to be installed in laundry 1 No 250 250
2.6 Bath 1675mm
Bath 1675mm to be installed in bathroom 1 No 750 750
2.7 Tap ware
Provide a PC sum of 1000 for supply of tap ware PC 1,000 1,000
2.8 Fittings
Provide a PC sum of 600 for supply of fittings PC 600 600
Labour – plumbers 25 Hours 80 2,000
Total for plumbing carried to summary 8,850
3 Electrical works
Provide a PC sum of 500 for supply of electrical works
including lighting fittings, switches and lighting points,
PC 500 500

Building and Construction Cost Estimation 6
SWA/PVC copper cables, meter board and earthing
Labour – electrician 15 Hours 70 1,050
Total for electrical works carried to summary 1,550
4 Woodwork
4.1 Shelves and joineries
Shelves and joineries in laundry, powder room, ensuite and
bath
PC 800 800
Labour – carpenters 18 Hours 45 810
4.2 Plasterboard cornice
15mm thick by 75mm high plasterboard cornice installed on
walls
44 M 8 352
Labour – wallboard fixers 15 Hours 40 600
Total for woodwork carried to summary 2,562
5 Ceiling
15mm thick quality gypsum plasterboard ceiling with taped
and filled joint in accordance with manufacturers instructions
18 M2 30 540
Labour – ceiling installers 15 Hours 60 900
Total for ceiling installation carried to summary 1,440
6 Painting
Prepare and apply 1 undercoat and 2 finishing coats of silk
vinyl emulsion paint to plasterboard ceilings’ surface
54 M2 4 216
Prepare and apply 1 undercoat and 2 finishing coats exterior
quality emulsion paint to plasterboard cornice surface below
100mm girth
44 M 4 176
Prepare and apply 1 undercoat and 3 finishing coats of
internal quality emulsion paint to plastered untilled internal
walls
212 M2 3 636
Labour – painters 15 Hours 60 900
Total for painting carried to summary 1,928
The summary of bill of quantities is provided in Table 2 below
Table 2: Summary of estimated costs
Item Description Amount ($)
1 Tiling 4,836
2 Plumbing 8,850
3 Electrical works 1,550
4 Woodwork 2,562
5 Ceiling 1,440
6 Painting 1,928
Sub Total 1 21,166
Add 12% builders margin 2,540

Building and Construction Cost Estimation 7
Sub Total 2 23,706
Add 10% GST 2,371
TOTAL 26,077
2. PART B
Preliminaries are very essential in construction projects because they provide mandatory
instructions, general information and running costs for setting up the project. The preliminary
costs are usually arbitrary in nature (Abas, Ismail, Ismail, & Arshad, 2017). The estimated cost
of preliminaries for the two storey brick veneer building at Penrith in Project 1 is provided in
Table 3 below
Table 3: Preliminary Estimate
Item Description Quantity Unit Rate ($) Amount ($)
1 Drawings and documentation costs PC 7,500
2 Site and access PC 8,200
3 Consultants fees PC 9,000
4 Authorities fees, including approvals,
inspections, LSL (long service levy), DA
and CC
11,500
5 Project supervision 6,500
6 Site clearing, demolition and cleaning 3,050
7 Builder’s risk allowance 420,000 % 0.005 2,100
8 Project publicity sign board PC 1,000
9 Temporary hoardings/site fencing 70 M 20 1,400
10 Scaffolding 140 M2 60 8,400
11 Site accommodation PC 4,100
12 Site security PC 2,850
13 Workplace health and safety PC 3,000
14 Traffic control PC 2,500
15 Removal of rubbish PC 2,200
16 Temporary services PC 6,500
17 Survey/setting out PC 4,000
18 Direct site labour 420,000 % 0.075 3,150
19 Quality control PC 3,500
20 Details of bond or guarantee terms and
loan interest allowance
PC 4,500

Building and Construction Cost Estimation 8
21 Contract conditions and insurances PC 3,500
22 Homeowners warranty insurance PC 4,200
Sub Total 1 102,650
Add 12% builder margin 12,318
Sub Total 2 114,968
Add 10% GST 11,497
TOTAL 126,465
References
Abas A smail smail Arshad R Cost of reliminaries of Construction rojects for Civil, ., I , F., I , Z., & , . (2017). P P
nfrastructure orks in MalaysiaI W . ains Humani aaS k , 9(2), 9-13.
Chan C he principal factors affecting construction project overhead e penses an e ploratory, . (2012). T x : x
factor analysis approach. Construction Management and Economics, 30(10), 903-914.
lfaki A Alatawi S Abushandi sing ntelligent echniques in Construction roject CostE , ., , ., & , E. (2014). U I T P
stimation ear SurveyE : 10-Y . dvances in Civil EngineeringA , 2014, 1-11.