How to Prepare Cost Estimate of Septic Tank

How to Prepare Cost Estimate of Septic Tank

In this Article today we will talk about the How to Prepare Cost Estimate of Septic Tank | Quantity of Septic Tank | Estimate of Septic Tank | Septic Tank Calculator | How to Calculate the Cost of Septic Tank | Septic Tank Estimate Excel | Concrete Septic Tank Cost | Excavation of Septic Tank | Brickwork in Septic Tank

How to Prepare Cost Estimate of Septic Tank:

Before starting this estimate you must read this article: How to Calculate the Size and Capacity of Septic Tank | Formula

Septic Tank Detail:

Plan Size:  11′-0″ X 7′-6″

Depth:       –  6′-9″ 

Septic Tank Items:

• Earth Work Excavation
• Filling Quantity of Septic Tank
• P.C.C
• Reinforced Concrete Work
• Reinforcement
• Brick Work – 230mm:
• Plastering Septic Tank Calculator 
• Manhole

How To Prepare Cost Estimate of Septic Tank:

Description:

Reinforced Concrete Work:

 

R.C.C  1:1.5:3  mix using 20 mm  stone jelly for roof slab, lintel, roof slab, lintel and sunshade excluding fabrication of RCC items and including cost and conveyance of all materials labor, etc., Septic Tank Calculator

Reinforcement:

 

Reinforcement for R.C.C work including straightening, cutting, bending, placing in position & binding all TMT bars Septic Tank Estimate Excel

 

Centering and Shuttering work: 

 

Centering and shuttering including strutting, propping, etc. and removal o formwork for Cut lintel & roof Concrete Septic Tank Cost

 

Earthwork:

 

Earthwork in excavation including disposal of the earth; disposed earth to be leveled and neatly dressed. Excavation of Septic Tank

How To Prepare Cost Estimate of Septic Tank:

P.C.C: 

 

P.C.C work: Providing and laying plain cement concrete of 1:5:10 (1cement: 5 coarse sand: 10 graded stone aggregate) including the cost of centering and shuttering.

 

Sand Filling:

Supplying and filling with river sand including watering, ramming, consolidating, and dressing. Excavation of Septic Tank

How To Calculate the Cost of Septic Tank?

Let us estimate the brick masonry septic tank as shown below. Brickwork in Septic Tank

How to Prepare Cost Estimate of Septic Tank

1. Excavation:

Volume of excavation

= [length × breadth × depth]

Here, the length & breadth of excavation is the same as that of PCC.

= [ 11ft. × 7.5ft. × 6.75ft.]

= 556.88 cu ft.

 

2. PCC:

Given data:

The extra length of PCC on all 4 sides of the septic tank is 6″ (0.5ft.)

Length = 11ft.

Breadth = 7.5ft.

Thickness= 5″ = 0.416 ft.

(As 1ft. = 12 inches)

Brickwork in Septic Tank

Volume of PCC:

=  [length × breadth × thickness]

= [ 11ft. × 7.5ft. × 0.416ft.]

= 34.32 cu ft.

 

3. Brick masonry:

 a.  9″ thick outer wall:

 Given data:

Length = 10ft.

Width = 9″ = 0.75 ft.

(As 1ft. = 12 inches)

Height = 6ft.

 

Let us find the vol. of brick masonry by the longwall short wall method.

The volume of the longwall:

=  [2nos.×( length × width × height)]

= [2nos. × ( 10 ft. × 0.75 ft. × 6 ft.)]

= [ 2nos. × 45 cu ft.]

= 90 cu ft.

 

The volume of the short wall:

=  2nos. × [{ length} × width × height]

= 2nos. × [{6.5 ft.- (2nos.× 0.75 ft.)}  × 0.75 ft. × 6 ft.]

=  2nos. × [{5 ft.} × 0.75 ft. × 6 ft.]

=  2nos. × [ 22.5 cu ft.]

= 45 cu ft.

 

The total volume of 9″ thk. brick wall

= the volume of { longwall + short wall}

= {90 cu ft. + 45 cu ft.}

= 135 cu ft.

 

b.  4″ thick inner partition walls:

Baffle wall-1

The volume of the baffle wall-1

=  [ {length} × width × (height)]

= [{ 6.5 ft.- (2nos.× 0.75 ft.)}  × 0.33 ft. × (6 ft. – 1.5 ft.)]

= [{5 ft.} × 0.33 ft. × (4.5 ft.)]

= 7.425 cu ft.

 

The volume of wall-2

= [ {length} × width × height]

= [{6.5 ft.- (2nos.× 0.75 ft.)}  × 0.33 ft. × 6 ft.]

= [{5 ft.} × 0.33 ft. × 6 ft.]

= 9.90 cu ft.

 

The total volume of 4″ thk. brick wall

= the volume of { wall-1+ wall-2}

= {7.425 cu ft. + 9.9 cu ft.}

= 17.33 cu ft. 

 

4. Plastering:

a. For 9″ brick wall:

Area of plastering

= 2nos. × [ (area of a longwall) + (area of a short wall)]

= 2nos. × [ (10ft. × 6ft.) + (5ft. × 6ft.)]

= 2nos. × [ 60 sq ft. + 30 sq ft.]

= 180 sq ft.

Note: Length & height of the longwall & short walls are taken for area calculation.

 

b. For 4″ inner wall

Area of plastering

= 2 sides. × [ (area of wall-1) + (area of  wall-2)]

= 2 sides × [ ( 5ft. × 4.5ft.) + ( 5ft. × 6ft.)]

= 2 sides × [ 22.5 sq ft. + 30 sq ft.]

= 105 sq ft.

 

c. For floor base

Floor area plastering

= [ {length} × { breadth.}]

= [{10 ft. – (2nos. × 0.75ft.)} × {6.5ft. – (2nos. × 0.75ft.)}]

= [ {10ft. – 1.5 ft.} × { 6.5ft. – 1.5ft.}]

= [8.5ft. × 5ft.]

= 42.5 sq ft.

 

Total plastering area

=  plastering area of [ 9″ wall + 4″ wall + floor]

= [180 sq ft. + 105sq ft. + 42.5 sq ft.]

= 327.5 sq ft.

 

5. RCC slab:

The area of the RCC slab

= [length × breadth ]

= [ 10ft. × 6.5 ft.]

= 65.0 sq ft.

 

6. Miscellaneous:

Inlet & outlet pipe of 4″ dia = 2 nos.

Manhole cover with frame = 1no.

Vent pipe = 1no.

Let us calculate the cost of a brick masonry septic tank as shown below.

 

Estimation and Rate Analysis of a Septic Tank:

Here, we will estimate the septic tank in sheet format as given below.

Sl. No.	Description	Nos.	Length in ft.	Breadth in ft.	Depth in ft.	Qty.	Total Qty. in c ft/sq ft.
1.	Earthwork Excavation	1	11	7.5	6.75	556.88	556.88
2.	M20 grade PCC	1	11	7.5	0.416	34.32	34.32
3.	9″ brick masonry  in 1:6 CM.
3a.	Long wall	2	10	0.75	6.0	45	90
3b.	Short wall	2	5	0.75	6.0	22.5	45
	Total volume of 9″ brick masonry						135.0
4.	4″ brick masonry in 1:5 CM.
4a.	Baffle wall-1	1	5	0.33	4.5	7.425	7.425
4b.	Wall-2	1	5	0.33	6.0	9.90	9.90
	Total volume of 4″ brick masonry						17.33
5.	12mm thick Plastering in 1:4CM
5a.	9″ long wall	2	10	——	6.0	60	120
5b.	9″ short wall	2	5	——	6.0	30	60
5c.	4″ baffle  wall-1 (on 2 sides)	2	5	——	4.5	22.5	45
5d.	4″ wall-2 (on 2 sides)	2	5	——	6.0	30.0	60
5e.	Floor area.	1	8.5	5.0	—–	42.5	42.5
	Total area of plastering						327.50
6.	RCC slab in M25 grade concrete	1	10	6.5	—–	65	65
7.	Manhole cover & frame of 2ft × 2ft size.						1 no.
8.	Vent. pipe						1 no.
9.	4″ dia. inlet & outlet pipe						2 nos.

 

Now, the cost of a septic tank is calculated in table format.

Sl. no.	Item.	Qty.	Rate. in INR.	Unit.	Cost in INR.
1.	Excavation	556.99	11/-	Cu ft.	6,126.89
2.	PCC	34.32	207.15/-	Cu ft.	7,109.39
3.	9″ brick masonry.	135	159.52/-	Cu ft.	21,535.20
4.	4″ brick masonry.	17.33	174.17/-	Cu ft.	3,018.37
5.	Plastering.	327.5	18.10/-	Sq ft.	5,927.75
6.	RCC slab	65	210/-	Sq ft.	13,650.00
7.	Man hole.	1	1800/-	No	1,800.00
8.	Vent pipe.	1	450/-	No	450.00
9.	Inlet & outlet pipe.	2	350/-	No	700.00
6.	The  cost of septic tank =				60,317.40
7.	Add 12% for contractors profit =				7,238.09
10.	The total cost of septic tank =				67,555.49

 

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Conclusion:

Full article on How to Prepare Cost Estimate of Septic Tank | Quantity of Septic Tank | Estimate of Septic Tank | Septic Tank Calculator | How to Calculate the Cost of Septic Tank | Septic Tank Estimate Excel | Concrete Septic Tank Cost | Excavation of Septic Tank | Brickwork in Septic Tank. Thank you for the full reading of this article in “The Civil Engineering” platform in English. If you find this post helpful, then help others by sharing it on social media. If any formula of BBS is missing from this article please tell me in comments.