Showing posts with label Architect. Show all posts
Showing posts with label Architect. Show all posts

ENGINEER | ARCHITECT | HOW TO ESTIMATE A CONSTRUCTION PROJECT

The image shows a truck entering the site of a construction site.

Engineer | Architect | How To Estimate a Construction Project

Contractors evaluate project specifications in order to prepare a cost estimate of the work to be tendered.
In order to reach a reliable estimate, it is necessary to comply with the tender documents and to establish, with the help of advisers, what is the logical sequence of tasks to be performed and what constructional methods to use.
A detailed list of each task is then prepared to meet the project requirements in a timely manner.
From this list, the Contractor will assess for each task the required resources of materials, labor, equipment, etc.,  to provide a reliable estimate of construction costs.
              
In this step, we are going to analyze the Itemized offer, we will make a careful analysis of essential activities for each task of the new Construction Work

A popular and usual implementation  is dividing the tasks of Construction Work, according to the different specialties, for example:

Specialties: Civil, Piping, and Equipment, Electrical, Instrumentation, and Control, Pre-Commissioning, and Commissioning

Then one divides each skill into different tasks and these at different sub-items. (For smaller works, these tasks can do with only one person that has a large experience of Construction work).

Examples of  Construction Cost Estimation for:

Civil works category

Task: Reinforcement concrete base.

A -1-1 Cutting, folded, and armed of steel.
A -1-2 Construction, and erecting formwork.
A -1-3 Filling of concrete.
A -1-4 Removal of formwork, and cleanliness.


Piping, and equipment category

Task: Assemble piping

B -1-1 Prefabricated piping.
B -1-2 Test hydraulics of spool.
B -1-3 Painting of spool.
B -1-4 Mount of spool, supports, and spool adjustment sections.
B -1-5  Hydraulics test piping.

Electrical assembly category

Task: Channelling

C -1-1 Excavation.
C -1-2 Laying of pipes.
C -1-3 Construction and concrete filling.
C -1-4 Wiring - Identification and connection of cables.

Based on all of the above, we arrive at the total unit cost of each task for materials and person-hours per unit of measurement for each sub-element.

Example: Construction Cost Estimation for Reinforced Steel

Task: Cutting, bending, and assembly of the armor.


Note: The sum of material plus labor for a kg of rebar is $6.
It should be noted that in each region the local values of labor and cost per kg of steel for reinforcing bars should be used.

The Excel spreadsheet is built one time and is used on all jobs, adapting to each specific job.
Excel makes no mistakes and also allows you to update any factor rapidly.
Software is now being used to automatically calculate the materials and times needed for assembly and construction.
As regards the valuation of labor costs, it is convenient that it is the Accounting section that sets these values.