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Preliminary estimation methods

How to check this project is feasibility or not? In a beginning of a project what are questions can ask by consultant to client???????????

1.Investment
2.Duration
3.Quality
4.Scale(100 bedroom)

1st Stage - We don't have any details or drawings single rate methods.

1. Unite method
2. Cube (Volume of the building - cost/m3)
3. Superficial area method
4. Story enclosure method

1.Unit method
This method to we can check (not exactly) whether this project possible or not?
Eg- Hotel - per car space (pricing) - quality - market price
- School - per desk
- Hospital - per bed

This method used very early stage.
Less accurate.

Unit method effecting things
*Location
*Site condition
*Market condition
*Not recent(so we need to adjust for the present inflation)

2nd Stage - We have out line about the project but not in details.

Schematic design
Design process
Inception (idea)
Schematic design (just a out line)

2.Cube (Volume of the building - cost/m3)
Disadvantage.
*We are not consider internal part
Eg - No of floor -

3.Superficial area method
Total cost = Area of total floor * cost/m2
Internal face external wall area

Advantage
We measured internal area
Eg- Lament cost also we can calculate easy.

4.Story enclosure method
Area * weight

Floor area (internal area)
Stranded weight factor

G.floor =2
Basement =4
2nd basement =4

1st floor =2.15
2nd floor =2.30
3rd floor =2.45

Wall area
Stranded weighting factor
Basement area =2
2nd Basement are =3

Above ground =1
Roof area =1

Cost control in construction projects

Pre contract phase       Sign the agreement         Post contract phase

Cost Estimation Cost control
It’s done by Consultant or client QS It’s done by Contractor QS
Cost control in pre contract phase

Ø If we want to select the suitable contactor normally we need to use tender process. In that case also we can do the cost control. That’s means

Normally 4 different methods are available for tender process.
1. Open tender.
2. Selected tender.
3. Pre-Registered tender.
4. Negotiated tender.

If we choose Negotiated tender we can control the total construction cost very easily.

Cost control in post contract phase
Case where total cost can change (increase/decrease)!!!!!!!!!!!!

From Client’s point of view
Ø Change of design and change of specification
ØVariation
1. Quantity variation
2. Quality variation

Ø Inflation.
Ø Extra work.
ØTax.
Ø Government (political) policy.
Case where total cost can change (increase/decrease)!!!!!!!!!!!!

From Contractor’s point of view
Ø Inflation.
Ø Time extension.
Ø Wastage.
Ø Proper Management.

Case where total cost can change (increase/decrease)!!!!!!!!!!!!

From Consultant’s point of view
Ø Detail drawings delay.
Ø Approval delay.

Normally we can divide the cost estimation method into 2 types in post contract phase.
1. Costing a design.
2. Design to a cost.

Costing a design.

Elemental costing – 30Elements are there (Its define by BCIS)

Eg:-
Material 60000.00
Labor 10000.00
Plant 10000.00
Over head 20000.00



In this method consultant and client will change the design (Specification –plant, material, etc) according to their purpose. As QS need to adjust the cost according to their condition at the same time we can’t exceed the total cost. Therefore for as Quantity Surveyor this method is very difficult.

Summary: - This method we all are concentrating the design - not cost

Design to a cost.
In this method total construction cost is fixed. That’s means

We can get the statistic from previous projects and make it several materials like foundation, roof. Then calculate the percentage then do the cost control in construction according to that.

In this method consultant and client will change the design (Specification –plant, material, etc) according to the total construction cost. Therefore for as Quantity Surveyor this method is very easy.

Summary: - This method we all are concentrating the cost - not design.