Residential Building (18SQ.M.)

DETAILED COST ESTIMATE

BILL OF QUANTITIES

.

I

II

III

IV

V

.

TOTAL

MATERIALS

LABOR

.

EARTH WORKS

TERMITE CONTROL

PLAIN AND REINFORCED CONCRETE

CONCRETE MASONRY

MASONRY

SUB-TOTAL

%WT

14.93%

2.57%

58.41%

15.62%

8.47%

.

100.00%

.

.

MATERIAL

Php 19,980.00

Php 5,634.00

Php 128,054.04

Php 34,253.13

Php 18,566.00

Php 206,487.17

.

Php 206,487.17

.

LABOR

Php 22,582.80

Php 1,690.20

Php 38,416.21

Php 10,275.94

Php 5,569.80

Php 78,534.95

.

.

Php 78,534.95

RECAPITULATION

I DIRECT COST ( DC )
A. MATERIAL COST – Php 206,487.17
B .LABOR COST – Php 78,534.95
TOTAL DIRECT COST ( TDC ) – Php 285,022.12

II INDIRECT COST ( IC )
D. OVERHEAD, CONTINGENCIES and MISCELLANEOUS EXPENSES – Php 11,400.88
E. CONTRACTOR’S PROFIT – Php 36,266.74
F. MOBILAZATION / DEMOBILIZATION – Php 7,771.44

INDIRECT COST (IC) – Php 55,439.06
VAT 12% of TDC + IC) – Php 40,855.34
TOTAL INDIRECT COST ( TIC ) – Php 96,294.41

III. TOTAL BID PRICE – Php 381,316.53

Estimating Cement, Sand, Gravel, Rebar, and ties for footing, tie-beams, beams, column, and slabs. In this example;

CEMENT 8:1

8 bags of cement were used per cubic meter of concrete volume. Formula: Cement (bags) = Volume Concrete (cum) x 8 Cement (bags). *Note: For safe estimate use 9 bags of cement per cubic meter of concrete volume.

SAND .5:1

0.5 Cubic meters of sand were used per cubic meter of concrete volume. Formula: Sand (cum) = Volume Concrete (cum) x 0.5 Sand (cum)

GRAVEL 1:1

Gravel used is equivalent to volume concrete.

REINFORCEMENT BAR

Using theoretical weights, kilograms per meter of rebar with diameters of 10mm equal to 0.62kg/m; 12mm equal to 0.89kg/m; 16mm equal to 1.58kg/m.

As a result, the weight of a 10mm diameter by 6 (Six) meter long piece is 3.72kg, a 12mm diameter by 6 (Six) meter long piece is 5.34kg and a 16mm diameter by 6 (Six) meter long piece is 9.48kg. In the specified material quantification, 16mm DIA Rebar, for example, requires 113.76kg, 12mm DIA Rebar, 369.53kg, and 10mm DIA Rebar, 522.21kg. To determine the number of rebar’s required. Formula: Number of Rebar’s = Total rebar weight divided by rebar weight per piece.

16mm Diameter =113.76kg / 9.48kg

16mm Diameter = 12pcs

12mm Diameter =369.53kg / 5.34kg

12mm Diameter = 69.2pcs or 70pcs

10mm Diameter =522.21kg / 3.72kg

10mm Diameter = 140.38pcs or 141pcs

Material shortages may be eased by including quantity in the final quantity estimate. That is, we must take in a safety factor while calculating. For example; Instead of 141pcs of 10mm Diameter, purchase 145pcs. A separate lesson will cover ordering materials.

Summary

Material unit costs may differ depending on the places in the Philippines. That’s why it is advisable to ask for a quotation before buying supplies. Buck orders can have discounts. Finding a reliable supplier is the best choice. (Material Cost per square meter may vary from 10k to 20k Pesos) “At this point in time, I’m writing“. The Labor unit cost used is 30% of the materials unit cost. The cost of manpower may vary depending on location, and area in Philippines, usually provincial rates and cities are different. Around 350 to 600 pesos labor cost on province and 600 to 1000 pesos on cities. Skilled manpower rates are different. (Labor Cost per square meter may vary from 2k to 6k Pesos) “At this point in time, I’m writing”. If plans are properly set on how to start the project lot of money can be saved. For example on labor, you can run down the cost to 10% to 20% if you have the proper experience and knowledge of the actual operation.