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Septic Tank (IS 2470, 5-50 user)

Rectangular brick masonry septic tank per IS 2470 Part 1 (household + community sanitation). PCC bed, brick walls in CM 1:6, internal cement plaster with waterproofing additive, RCC cover slab with manhole + vent + inlet/outlet RCC pipes. Standard SBM-G / SBM-U design. Rates: CPWD DSR Vol 1 + Vol 2 (2023).

Visual confirmation
Plan · 2 × 0.9 m internal
INLETOUTLETMHMHbaffle2.46 m1.36 m
Long elevation · 2 m × 1 m liquid
2.46 m1 mNGL
Section · width 0.9 m, liquid 1 m
0.9 m1 mRCC coverFree boardLiquidFoundation brickNGL
Bill of Quantities14 items · CPWD DSR Vol 1 + Vol 2 (2023)
#CodeDescriptionUnitQtyRate (₹)Amount (₹)
12.8.1ExcavationEarth work in excavation by mechanical means (Hydraulic excavator) / manual means in foundation trenches or drains (not exceeding 1.5 m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, for all lift, including getting out the excavated soil and disposal of surplus excavated soil as directed, within a lead of 50 m. — All kinds of soil.Cum8.93260.302,324.48
24.1.10Pcc BedProviding and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : — 1:5:10 (1 cement : 5 coarse sand (zone-III) derived from natural sources : 10 graded stone aggregate 40 mm nominal size derived from natural sources)Cum0.396,518.602,542.25
36.1.2Brick FoundBrick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in foundation and plinth in: — Cement mortar 1:6 (1 cement : 6 coarse sand)Cum1.167,132.258,273.41
44.10DpcProviding and laying damp-proof course 40 mm thick with cement concrete 1:2:4 (1 cement : 2 coarse sand (zone-III) derived from natural sources : 4 graded stone aggregate 12.5 mm nominal size derived from natural sources)Sqm1.55410.85636.82
56.4.2Brick AboveBrick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in superstructure above plinth level up to floor V level in all shapes and sizes in : — Cement mortar 1:6 (1 cement : 6 coarse sand)Cum2.019,105.9518,302.96
65.3Rcc Cover SlabReinforced cement concrete work in beams, suspended floors, roofs having slope up to 15° landings, balconies, shelves, chajjas, lintels, bands, plain window sills, staircases and spiral stair cases above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement with 1:1.5:3 (1 cement : 1.5 coarse sand(zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources).Cum0.4211,505.504,832.31
75.9.3Shutter SlabCentering and shuttering including strutting, propping etc. and removal of form for — Suspended floors, roofs, landings, balconies and access platformSqm3.35927.253,106.29
85.22.6SteelSteel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete upto plinth level. — Thermo-Mechanically Treated bars of grade Fe-500D or more.Kg41.82107.854,510.29
913.1.2Plaster Int12 mm cement plaster of mix : — 1:6 (1 cement: 6 fine sand)Sqm9.34333.353,113.49
1022.5WaterproofingProviding and laying water proofing treatment in sunken portion of WCs, bathroom etc., by applying cement slurry mixed with water proofing cement compound consisting of applying : (a) First layer of slurry of cement @ 0.488 kg/sqm mixed with water proofing cement compound @ 0.253 kg/ sqm. This layer will be allowed to air cure for 4 hours. (b) Second layer of slurry of cement @ 0.242 kg/sqm mixed with water proofing cement compound @ 0.126 kg/sqm. This layer will be allowed to air cure for 4 hours followed with water curing for 48 hours. The rate includes preparation of surface, treatment and sealing of all joints, corners, junctions of pipes and masonry with polymer mixed slurry.Sqm9.34617.055,763.25
117132Manhole CoverCircular shape 450 mm dia precast R.C.C. manhole cover with frame - L.D. - 2.5Each2.00610.001,220.00
1219.6.2Rcc Pipe In OutProviding and laying non-pressure NP2 class (light duty) R.C.C. pipes with collars jointed with stiff mixture of cement mortar in the proportion of 1:2 (1 cement : 2 fine sand) including testing of joints etc. complete : — 150 mm dia. R.C.C. pipeMetre4.00556.452,225.80
136.12.2Baffle WallHalf brick masonry with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in foundations and plinth in : — cement mortar 1:4 (1 cement : 4 coarse sand)Sqm0.78905.05705.94
1419.6.1Vent PipeProviding and laying non-pressure NP2 class (light duty) R.C.C. pipes with collars jointed with stiff mixture of cement mortar in the proportion of 1:2 (1 cement : 2 fine sand) including testing of joints etc. complete : — 100 mm dia. R.C.C. pipeMetre6.30507.053,194.42
Your inputsusers 10-user · int. length 2 m · int. width 0.9 m · Liquid depth 1 m · Free board 0.3 m · Wall thk 230 mm · int. waterproofing · Baffle wall between settling + outlet chambers · Vent pipe height above ground 5 mTOTAL₹60,752
12.8.1₹2,324
Excavation
Earth work in excavation by mechanical means (Hydraulic excavator) / manual means in foundation trenches or drains (not exceeding 1.5 m in width or 10 sqm on plan), including dressing of sides and ramming of bottoms, for all lift, including getting out the excavated soil and disposal of surplus excavated soil as directed, within a lead of 50 m. — All kinds of soil.
8.93 Cum× ₹260.30
24.1.10₹2,542
Pcc Bed
Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level : — 1:5:10 (1 cement : 5 coarse sand (zone-III) derived from natural sources : 10 graded stone aggregate 40 mm nominal size derived from natural sources)
0.39 Cum× ₹6,518.60
36.1.2₹8,273
Brick Found
Brick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in foundation and plinth in: — Cement mortar 1:6 (1 cement : 6 coarse sand)
1.16 Cum× ₹7,132.25
44.10₹637
Dpc
Providing and laying damp-proof course 40 mm thick with cement concrete 1:2:4 (1 cement : 2 coarse sand (zone-III) derived from natural sources : 4 graded stone aggregate 12.5 mm nominal size derived from natural sources)
1.55 Sqm× ₹410.85
56.4.2₹18,303
Brick Above
Brick work with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in superstructure above plinth level up to floor V level in all shapes and sizes in : — Cement mortar 1:6 (1 cement : 6 coarse sand)
2.01 Cum× ₹9,105.95
65.3₹4,832
Rcc Cover Slab
Reinforced cement concrete work in beams, suspended floors, roofs having slope up to 15° landings, balconies, shelves, chajjas, lintels, bands, plain window sills, staircases and spiral stair cases above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement with 1:1.5:3 (1 cement : 1.5 coarse sand(zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources).
0.42 Cum× ₹11,505.50
75.9.3₹3,106
Shutter Slab
Centering and shuttering including strutting, propping etc. and removal of form for — Suspended floors, roofs, landings, balconies and access platform
3.35 Sqm× ₹927.25
85.22.6₹4,510
Steel
Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete upto plinth level. — Thermo-Mechanically Treated bars of grade Fe-500D or more.
41.82 Kg× ₹107.85
913.1.2₹3,113
Plaster Int
12 mm cement plaster of mix : — 1:6 (1 cement: 6 fine sand)
9.34 Sqm× ₹333.35
1022.5₹5,763
Waterproofing
Providing and laying water proofing treatment in sunken portion of WCs, bathroom etc., by applying cement slurry mixed with water proofing cement compound consisting of applying : (a) First layer of slurry of cement @ 0.488 kg/sqm mixed with water proofing cement compound @ 0.253 kg/ sqm. This layer will be allowed to air cure for 4 hours. (b) Second layer of slurry of cement @ 0.242 kg/sqm mixed with water proofing cement compound @ 0.126 kg/sqm. This layer will be allowed to air cure for 4 hours followed with water curing for 48 hours. The rate includes preparation of surface, treatment and sealing of all joints, corners, junctions of pipes and masonry with polymer mixed slurry.
9.34 Sqm× ₹617.05
117132₹1,220
Manhole Cover
Circular shape 450 mm dia precast R.C.C. manhole cover with frame - L.D. - 2.5
2.00 Each× ₹610.00
1219.6.2₹2,226
Rcc Pipe In Out
Providing and laying non-pressure NP2 class (light duty) R.C.C. pipes with collars jointed with stiff mixture of cement mortar in the proportion of 1:2 (1 cement : 2 fine sand) including testing of joints etc. complete : — 150 mm dia. R.C.C. pipe
4.00 Metre× ₹556.45
136.12.2₹706
Baffle Wall
Half brick masonry with common burnt clay F.P.S. (non modular) bricks of class designation 7.5 in foundations and plinth in : — cement mortar 1:4 (1 cement : 4 coarse sand)
0.78 Sqm× ₹905.05
1419.6.1₹3,194
Vent Pipe
Providing and laying non-pressure NP2 class (light duty) R.C.C. pipes with collars jointed with stiff mixture of cement mortar in the proportion of 1:2 (1 cement : 2 fine sand) including testing of joints etc. complete : — 100 mm dia. R.C.C. pipe
6.30 Metre× ₹507.05
users 10-user · int. length 2 m · int. width 0.9 m · Liquid depth 1 m · Free board 0.3 m · Wall thk 230 mm · int. waterproofing · Baffle wall between settling + outlet chambers · Vent pipe height above ground 5 m
Estimated total
₹60,752
Notes & assumptions
  • Default internal dimensions match IS 2470 Part 1 standard sizes. Override the form fields if your site has constraints — the formulas auto-adjust.
  • IS 2470 sizes (length × width × liquid depth): 5-user 1.5×0.75×1.0 m · 10-user 2.0×0.9×1.0 m · 20-user 2.0×1.2×1.4 m · 50-user 4.0×1.5×1.7 m.
  • Cover slab is 125 mm RCC with 8 mm bars @ 150 mm c/c bothways. Steel = 100 kg/m³. Bump to 150 mm + 110 kg/m³ for spans > 2.5 m.
  • Internal cement-mortar waterproofing (DSR 22.5) is recommended for any septic tank in expansive clay / black-cotton soil + JJM-funded community systems. Skip toggle for hard-rock or sandy-permeable sites where exfiltration is acceptable.
  • 2 nos manhole covers (one over each compartment); 4 m of 150 mm RCC pipe approximates 2 nos inlet + 2 nos outlet runs of ~1 m each. Adjust manually if pipe lengths are different.
  • Excludes: baffle wall (small brick partition between settling + scum chambers — add ~0.15 m³ brickwork via 6.4.2 manually), vent pipe (4 m × 50 mm GI ~₹1,500), inlet/outlet inspection chambers upstream, soak pit downstream (see [Soak Pit](/boq/soak-pit) template).

A **septic tank** is the on-site sewage treatment chamber that every Indian household or community without sewer connection uses. It receives black-water from toilets, holds it in two compartments for settling + anaerobic breakdown, and discharges treated effluent to a soak pit downstream. **IS 2470 Part 1 (Code of Practice for Installation of Septic Tanks)** specifies the rectangular brick-masonry tank with PCC bed, internal cement plaster + waterproofing, RCC cover slab with manhole, and inlet/outlet RCC pipes. Sized 5 to 50 users for SBM-G household + community sanitation, larger for commercial complexes. This BOQ Builder generates the complete cost per CPWD DSR 2023.

What's included and what's excluded

**Included** — earthwork in foundation trench, PCC bed below tank, brick masonry foundation + above plinth walls, DPC band, internal cement plaster (with optional waterproofing additive per IS 2645), RCC cover slab with steel reinforcement and centering, 2 nos manhole covers, 4 m of 150 mm RCC pipe for inlet + outlet runs. **Excluded** — baffle wall between settling and scum compartments (small partition, ~0.15 m³ brickwork — add manually); vent pipe (4 m × 50 mm GI pipe ~₹1,500); upstream inspection chamber for sewage from toilet; downstream soak pit (use the dedicated [Soak Pit](/boq/soak-pit) template); secondary chamber if 3-compartment design preferred; tile finish on internal surface (optional for ease-of-cleaning, +₹400/m²).

IS 2470 Part 1 standard sizes

Per IS 2470 Part 1 Table 2, the **liquid-volume requirement** scales with users + accumulation time (de-sludging frequency): for 1-year cleaning interval (CPWD-recommended), 90 litres / user / day liquid retention + 30 days sludge accumulation. Standard tank sizes: **5-user** = 1.5 m × 0.75 m × 1.0 m liquid depth (1.125 m³); **10-user** = 2.0 m × 0.9 m × 1.0 m (1.8 m³); **15-user** = 2.0 m × 1.0 m × 1.2 m (2.4 m³); **20-user** = 2.0 m × 1.2 m × 1.4 m (3.36 m³); **30-user** = 3.0 m × 1.2 m × 1.5 m (5.4 m³); **50-user** = 4.0 m × 1.5 m × 1.7 m (10.2 m³). Free board (300 mm above liquid line) is added for ventilation + grease layer. This Builder pre-loads these sizes when you pick the user-count dropdown; you can override per site constraint.

Frequently asked questions
**5-user tank** (1.5 × 0.75 × 1.0 m liquid depth) covers a 4-5 person family with normal water use. **10-user** (2.0 × 0.9 × 1.0 m) is the SBM-G recommended community-block size for 8-12 person joint family or small apartment. **20-user** covers a 15-20 person community or small school. **50-user** covers a community of ~40-50 (large school / hostel / industrial labour colony). Always size on the higher side of estimate — under-sizing causes overflow + bad odour.

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Disclaimer: Rates sourced from CPWD DSR Vol 1 + Vol 2 (2023). Indicative for estimation only — actual tender quotations are governed by market forces, locality factors and current input prices. Quantities follow IS 1200 measurement. Always verify with a local quote before finalising. © InfraLens — infralens.in