This document summarizes a lecture on quantity surveying. It discusses key tasks of quantity surveyors including preparing bills of quantities and cost estimates. It also covers documentation used like drawings, specifications, take-off sheets and standard method of measurement. Common tools used by quantity surveyors are also listed. Key documents prepared by QS include bills of quantities, take-off sheets, and payment certificates. The role of consultant and contractor QS are compared and it is noted consultant QS work on behalf of the client while contractor QS work for the contractor.

1. Quantity Surveying.
LECTURE 01 – 2022/07/31 TO 2022/08/14
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
01
1. CENTERLINE GIRTH
2. FORMS OF DIMENSIONS
3. ORDER OF DIMENSIONS
4. IDENTIFICATION OF SHEETS
5. TDS SHEET
6. ENTERING DIMENSIONS

2. Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
02
Girth types.
A. Internal Girth
B. Centerline girth
C. External Girth
A
B
C

3. Calculation 01
Find Internal / Centerline / External Girth
EX- 1.1
1200mm
225mm

4. Calculation 01
Find Internal / Centerline / External Girth
EX- 1.2
4000mm
2000mm
2000mm
2000mm

5. Calculation 01
Find Internal / Centerline / External Girth
EX- 1.3 5000mm
8600mm
7000mm
4000mm
3000mm
8000mm
4600mm

6. Forms of Dimensions
• Cube - m3 , ft3
• Suqare - m2 , ft2
• Lenior - m , ft
• Number - 1Nr. , 5Nr… etc..
• Item - 1 Item , 3 Items ..etc..
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
03

7. Order of dimensions
• When entering dimensions, the order should be
followed through.
• 1. Horizontal length
• 2. Horizontal width or breath
• 3. Vertical Depth or height
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
04

8. Identification of TDS sheet.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
05
Binding Times Dimens
ions
Squaring Description Times Dimen
sions
Squa
ring
Description
9mm
14mm
15mm
16mm
55mm
14mm
15mm
16mm
54mm
Times Dimensio
ns
Squarin
g
Description
Times
Dimensio
ns
Squaring
Description
Binding
9mm
14mm
15mm
16mm
55mm
14mm
15mm
54mm
9mm
Face side
Reverse
side

9. 01 – Binding
• First column of the face side and last column of the rivers side.
• This 09mm column is allocated for binding the TDS Sheet.
Identification Of TDS Sheet
02 – Timesing
• Second column of the face side and first column of the rivers side.
• This 14 column is allocated for mention the multiplying the figures in Dimension
column. When there is more than one of the particular item being same
dimensions.

10. 03– Dimension
• Is the dimension column where the actual dimensions, as scaled or taken direct
from drawings are entered there may be one, two or 3 lines of dimension in an
item depending on where it is linear Square or Cubic.
Identification Of TDS Sheet ….Cont….
04 – Squaring
• Is the “Squaring Column” where the length area or volume obtaining by
multiplying together the figures in column two and three recorded ready for
transfer to the abstract or bill.

11. 05 – Description
• Is the description column where the written description of each item is entered.
The right hand side of these column is used for preliminary calculations and
other basic information needed in building up to dimensions and references to
the location of the work and is referred to as “waste”
Identification Of TDS Sheet ….Cont….

12. Calculation 01
Find Internal / Centerline / External Girth
EX- 1.4 225mm
112.5mm
800mm x 1200mm 1200mm x 800mm
6000mm
4000mm

13. Entering Dimensions.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
05
• Cube measurement
Times Dimens
ions
Squaring Description Times Dimen
sions
Squa
ring
Description
03.00
02.00
00.90 05.40
• Indicating a cubic measurement with 3.0m long , 2.0m wide and 0.9m deep trench excavation
Excavation of trenches width >
300mm, depth <1000mm
(D.2.5.1)

14. Entering Dimensions.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
05

15. Identification of TDS sheet.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
05
Times Dimensi
ons
Squaring Description Times Dimen
sions
Squa
ring
Description
9mm
14mm
15mm
16mm
55mm
14mm
15mm
16mm
54mm

16. Identification of TDS sheet.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
05
Times Dimensi
ons
Squaring Description Times Dimen
sions
Squa
ring
Description
9mm
14mm
15mm
16mm
55mm
14mm
15mm
16mm
54mm

17. When we need QS
• To get an idea about the budget for required
building completion in first stage.
• Handle the bidding and tendering process
• To prepare bills.
• To plane required manpower, Machinery and
tools to complete withing given time period.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
06

18. QS
Consultant QS Contractor QS
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
07

19. • Consultant QS • Contractor's QS
• Working Behalf of Client
• Preparation of BOQ for
tendering process
• Maintaining Required
quality
• Working behalf of Contractor
• Preparation of tendering
documents
• Measuring and preparation
of bill
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
08

20. • Estimating the project cost for
client
• Preparation of BOQ for
Tendering Process
• Arranging tendering
documents
• conducting tendering process
• Preparation of Check
contractor’s bill
• Preparation of payment
certificate
• Controlling the cost behaf of
client.
Consultant QS
Pre-contract Stage Post Contract stage
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
09

21. Contractor QS
Pre-contract Stage Post Contract stage
• Preparation of bidding documents
• Planning Required Materials,
Manpower machineries and tools.
• Manage required bonds when
need
• Preparation of interim payment bills.
• Preparation and check sub contractor bills
• Recasting required materials while
construction ongoing
• Value variations and extra works.
• Guide management about project cost.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
10

22. Documents For QS
• Drawings
• Specifications
• Bill Of Quantities (BOQ)
• TDS / Abstract / Query Sheets
• Standard Method of Measurements (SMM)
• BSR / HSR / ISR
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
11

23. Tools For QS…
• Measuring tape
• Scale
• Calculator
• Stationary
• Computer Software (Excel..)
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
12

24. BOQ..?
• The document used in tendering to give some
quantitative idea about what contractor have to do.
• And also it describe the terms and conditions for the
project
• Guideline for contractor to conduct the project
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
13

25. Proposed main building construction for ABC Pvt.Ltd. Colombo 01
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
14

26. TDS / Abtract / Query
14mm
15mm
16mm
55mm
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
15

27. Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
16

28. SMM….
• This guides to prepare BOQ.
• Provide BOQ description with proper technical
methods
• Guide which units suitable for taking
measurments
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
17

29. Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
18

30. Form of dimensions
• Cube - Rubble work, Excavation, etc.…
• Squre - Formwork , Brick work, etc.…
• Lenoir - Plinth , plumbing pipe lengths
• Number - Fixing bathroom fittings
• Items - Supply & Fixing door, etc.
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
19

31. Questions?
The End
Lecturer R. D. THILANKA JAYANATH.
BSc. (Hons.) Civil & Structural Engineering. Aff.Mem. ASCE.
20