Cost Estimation For Powder Room, Laundry, Ensuite, And Bathroom In Project 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:

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

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 =

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 =

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.

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.

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.  

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 =

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

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, SWA/PVC copper cables, meter board and earthing		PC	500	500
	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
	Sub Total 2	23,706
	Add 10% GST	2,371
	TOTAL	26,077

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
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., Ismail, F., Ismail, Z., & Arshad, R. (2017). Cost of Preliminaries of Construction Projects for Civil Infrastructure Works in Malaysia. Sains Humanikaa, 9(2), 9-13.

Chan, C. (2012). The principal factors affecting construction project overhead expenses: an exploratory factor analysis approach. Construction Management and Economics, 30(10), 903-914.

Elfaki, A., Alatawi, S., & Abushandi, E. (2014). Using Intelligent Techniques in Construction Project Cost Estimation: 10-Year Survey. Advances in Civil Engineering, 2014, 1-11.