Quantity
Take Off
Outline
• Importance of Quantity
Takeoff
• Preparation of Quantity
Takeoff
• Measurement Units
• Measuring excavation, P.C
footings, Beams, Columns,
slabs, and stairs..etc.
Owner perspective:
Quantity
take-off:
Why?
• Initial (preliminary) estimate
of the project costs at the
different stages of the
project.
• Preparing the BOQ as a
requirement of the contract
documents.
• Estimating the work done for
issuing the contractor
payments.
Contractor perspective:
Quantity
take-off:
Why?
• Pricing different work items.
• Identifying the needed
resources (Labor, Equipment,
etc.).
• Project schedule.
• Preparing invoices for work
done.
• Subcontractors’ payments.
• Review and control of crews’
production rates.
Quantity take-off: Why?
The Bill of Quantities (BOQ)is defined as a list of brief descriptions and estimated quantities
Quantity Take-off
The quantity “takeoff” is an important part of the cost
estimate. It must be as accurate as possible and
should be based on all available engineering and
design data
Quantity Take-Off Methods
require:
Quantity
Take-off
Detailed measurements of
a building’s components,
materials, and construction
labor to determine a scope
of work required and a cost
estimate of the
construction project.
The values for Quantity
Take-Off Methods are
Quantity
Take-off
typically measured and
calculated by building
construction estimators
using the construction
documents, building plans,
and specifications to
determine the scope and
cost estimate.
Quantity Take-Off Methods on the Civil
Quantity
Take-off
Engineering measure and calculate various
building materials or components such as:
• Building Materials
• Roofing
• Walls
• Flooring
• Site Development
• Soil cut and fill
• Landscaping
• Hardscaping
• Structure
• Steel
• Concrete
• Wood (Timber)
• Foundations
• Retaining Walls
• Footings
Units of
Measureme
nt
• Two systems in North American
construction
• English system
• Metric system
• Estimators are advised to work
entirely in one system
• Mixing increases probability of
error
Item Units
• Basic categories:
• Number
• Length
• Area
• Volume
• Weight
Order of items
Items estimated in cubic meter (m3)
Items estimated in square meter (m2)
Work Order
Items estimated in linear meter (m)
Items estimated in numbers or weight
(unit, ton)
Items estimated in lump sum (L.S.)
Cubic meter (m3)
Used for items such as:
Measuring
Units
•
•
•
•
Excavation
Back Filling
Concrete
Masonry
Square meter (m2 )
Measuring
Units
Used for items such as:
•
•
•
•
Masonry
Plastering
Flooring
Painting
Measuring Units
Linear meter (m)
Used for items such as:
• Oil pipe lines
• Sewage water pipe lines
• Canals
Number (unit)
Measuring
Units
Used for items such as:
• Electric outlets
• Doors and windows
• Sanitary fixtures
Measuring
Units
Lump sum(L.S.)
Used for items such as:
• Manholes
• Lifts
Preparation of Quantity Take Off
Check the
availability of
drawings
Check the axis and
dimensions
Check building
levels and link it to
structural drawings.
Check doors and
windows model
numbers
Check ground
water levels
Preparation of Quantity Take Off
Check architectural
against structural
drawings
Check foundation
design and
foundation levels
Check construction
members dimension
and
Review the contract
conditions and
specifications
Check construction
members dimension
and reinforcement.
Formulas/Perimeter Centerline
Calculations
Formulas/Perimeter Centerline
Calculations
Formulas/Perimeter Centerline
Calculations
Formulas/Perimeter Centerline
Calculations
Example Calculation of Quantity
• Earth Works
Earth works comprises site level, excavation, backfilling and transportation of excavated
materials
Excavation:
• Quantities are calculated based on the dimensions of the foundation in plans from
the owner perspective.
• Contractors should consider the excess of material excavated to all for safe
operations.
• Prices differ based on the soil type, deep of excavation, ground water level, site
location, shoring system, Equipment used, etc.
• Unit of measurement is cubic meter (volume).
Design
Drawing
Design
Drawing
Design
Drawing
L
P
EXCAVATION WORK
FOUNDATION WORK
CONCRETE WORK
Column
Work Item to be Estimated
Land
Clearing
BOUWPLANK
Excavation
Back Filling
Foundations
Sloof
Brick
Column
Slab
Roof top
Door,
Windows
Ceiling
Wall and
Floor
Plastering
Pointing
Painting
Drainage
Electrical
Septictank