Table of content for 1000 sqft house construction material estimate-
- Layout Description
- Estimation of Excavation
- Estimation of Substructure Work
- Estimation for Superstructure Work
- Abstract of Quantities
- House Construction Material Estimate
House construction is a once in a lifetime opportunity for the majority of the people. More than an investment, it has an emotional aspect related to it. In this article, we shall estimate the construction material required for a 1000 square feet house.
First, we shall calculate the quantities of works like excavation, PCC, concrete, reinforcement, tiles. Second, the material required for executing all works shall be calculated.
Let us prepare the house construction material estimate for a 1000 square feet plot.
The plot is rectangular and has an area of 1050 square feet. The house rooms have the following dimension-
|Room||Size in m|
|Master Bedroom||3.00 x 3.45|
|Bedroom 2||3.00 x 3.00|
|Bedroom 3||3.00 x 3.10|
|G/Kitchen||3.60 x 2.95|
|F/Kitchen||2.67 x 1.80|
|Living Room||3.30 x 3.50|
|Dining Room||2.70 x 5.00|
|C/Toilet||1.20 x 2.50|
|A/Toilet||1.75 x 1.30|
|Front Porch||3.30 x 1.50|
Estimation of Excavation
A foundation constructed on a firm stratum. The minimum depth for a foundation is 1.5 m.
The construction is to be carried out by mechanical means like a backhoe or an excavator. The excavation is carried out individually for each footing. Also, an extra 0.6 m has been excavated on all the sides of footing for the working space.
The house is built on 20 Nos. isolated rectangular footings of size 1.2 x 1.2 at 1.5 m depth from the NGL.
The excavation length for each footing = 1.2 + 2*0.6 = 2.4 m
The excavation width for each footing = 1.2 + 2*0.6 = 2.4 m
The excavation is done till the bottom of PCC (thickness of PCC is 100 mm) = 1.5 + 0.1 = 1.6
Estimation of Sub Structure Work
The substructure work includes PCC, reinforcement, shuttering and concreting work of foundation, column and plinth beam.
The plain cement concrete provides a levelled surface for the foundation reinforcement works. The grade of PCC is M10.
The PCC thickness is 100 mm (=0.1 m). An offset of 0.05mm on either side of the footing is maintained.
Length for PCC area for each footing = 1.2 + 2*0.05 = 1.3 m
Width for PCC for each footing = 1.2 + 2*0.05 = 1.3 m
The grade considered in the example for reinforced cement concrete is M20. It is the minimum grade of concrete to be used for the RCC.
Foundation thickness = 0.6 m
Columns = 20 Nos. of size 0.3 x 0.3
Depth of Column for Substructure = (NGL – Top of Foundation) = (0- (-1.5)) = 1.5 m
Plinth Beam Size = 0.4 m x 0.6 m
Plinth Beam Total Length = 70.45 m (as calculated from the attached layout)
Assuming nominal reinforcement as follows- The density of steel = 7850 kg per cum
Estimation of Backfilling
The backfill soil is filled into the foundation pits to cover the foundation. The backfilled soil is watered and well compacted by manual or mechanical means. The manual means include a rammer or a manual roller and the mechanical means include vibratory roller, sheep foot roller etc.
Backfill Quantity = (Excavation Quantity – PCC Poured – RCC Poured in Sub Structure)
Estimation of Superstructure Work
The superstructure work includes columns, beams and slab work.
Columns = 20 Nos. of size 0.3 m x 0.3 m
Slab top level from NGL = 3.0 m
Slab thickness = 150 mm = 0.150 m
Height of Column for Superstructure = (Top of Slab – Slab thickness – NGL) = (3.0 – 0.15 – 0) = 2.85 m
Floor Beam Size = 0.3 m x 0.5 m Floor Beam Total Length = 70.45 m (as calculated from the layout)
The reinforcement calculation for superstructure work is as follows-
The finishing works include brickwork, flooring plaster and painting.
The brickwork is 0.225 m thick for all the walls.
The brick size is as per the Indian standard, i.e., 190 mm x 90 mm x 90 mm.
As it can be observed from the above drawings that the brick wall is provided over the plinth beam.
Therefore, Total wall-length = Beam length = 70.45 m Wall height = Floor Beam Bottom Level – Plinth Level = 2.85 – 0 = 2.85 m
Plaster covers the brickwork and provides a smooth surface for putty and paint. For this example, consider the thickness of plaster as 12 mm for the slab, external walls and internal walls.
Wall Plaster (internal & external both) = 2 x Wall Area. Also, the wall area is determined by multiplying the wall length by the wall height
Wall Area = 70.45 x 2.85 – Deductions for Doors & Windows = 192.24 sqm
Slab Plaster = Length x Width
The quantity of mortar is calculated as follows-
= Plaster Area x Plaster thickness
= 480.14 x 0.02
= 9.60 cum
For this example, the painting job includes putty work and 2 coats of paint on the slab and walls.
Since painting is done over the plastered area only, therefore
Painting = Plaster = 480.14 sqm
Estimation of Flooring
The flooring covers the plinth area of the building. The house contains three types of flooring-
- Marble for bedrooms, living area, dining area and sit out.
- Kitchen and Toilets have anti-skid tiles over the floor.
Also, a PCC of 100 mm thickness is laid over the entire plot area.
Flooring PCC thickness = 100 mm = 0.1 m
Flooring PCC Quantity = (Plot Area – Area Covered by walls) x PCC thickness
Where, area covered by walls = Wall length x Wall Thickness = 70.45 x 0.225 = 15.85 sqm
Anti-Skid Tile Flooring for Kitchens and Toilets-
= Total area – Area covered by walls – Kitchen area – toilet area
= 1050 – 15.85 – 20.70
= 1013.45 sqm
Abstract of Quantities for House Construction Material Estimate
The abstract of quantities is the summary of all the works to be done for the construction of the house.
House Construction Material Estimate
The material requirement for PCC, RCC, brickwork and plaster are calculated by “The construction Material Excel Calculator by Civilverse” has been used. You can download the same by clicking on the link.
The material statement is standard. However, for planning and procurement purposes, wastages are to be added extra as-
- Cement– 1%
- Reinforcement– 2% (1.5% returnable and 0.5% invisible wastage)
- Brick- 5%
- Aggregate and Sand– 4%
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