This thread is basically to educate you on how you can more accurately estimate the cost of your project before hand. To guide your negotiation with your artisan.
I will be doing this using a simple design, which will be posted here.
Questions on specific cost related items will also be addressed.

uwemjack:
This thread is basically to educate you on how you can more accurately estimate the cost of your project before hand. To guide your negotiation with your artisan.
I will be doing this using a simple design, which will be posted here.
Questions on specific cost related items will also be addressed.

Nice one, I will appreciate if you could talk about fencing a compound of about 550sq meters, block wrk and cement required

following...

Following

Starting with...
cost of construction for a fence

There are three elements in the fence construction namely
1. Foundation (part hidden in the ground)
2. Superstructure (parts visible above the ground)
3. Finishing (parts that make the wall beautiful)

Foundation - this involves
Option 1 (where a concrete beam is required)
- Excavating, leveling and compacting
- earthwork support (only applicable where the foundation is deep and or the earth is loose)
- concrete blinding (to have a level and solid working surface, also serves as cover for reinforcement or iron, this is not required in all cases)
- formwork for the concrete beam (timber/planks)
- reinforcement or iron
- concrete beam (cement, sand and granite)
Option 2 (no concrete beam)
- Excavation, levelling and compacting
- Concrete footing/blinding
- Blockwork

Superstructure - This involves
- the columns (tied to the foundation beam and divides the wall into bays, it could be with blocks or concrete)
- the block wall
- concrete coping (if desired)

Finishing - this involves
- plastering to the walls
- painting to the walls
- concertina barbed wire or electric fence wire (if your budget carries it)

For my cost calculation i will make the following assumptions;
1. My fence is 10 meters long
2. There is a concrete ground beam
3. There are concrete columns at intervals of 3meters
4. The height of my fence from the natural ground level is 2.5 meters

Can you help me in making this projection?

Cost of fencing


1. 3 plots


2. 1 Acre


3. 2 Acres

Foundation
The drawing below is a section through the foundation of the fence.

Cost of excavation
This can be calculated using the length of the fence or the volume of excavation
If length is 10m then cost at N500 per m assuming the earth is not hard makes it N5,000
Using volume which is 0.6 x 0.7 x 10m = 4.2m3
Cost of excavation at ₦1,200/m3 = ₦5,040

Cost of blinding and inverted T-concret beam
Volume of concrete blinding = 0.7 x 0.05 x 10m = 0.35m3
Concrete in inverted T-beam = (0.1 x 0.7 x 10m)+(0.4 x 0.23 x 10m) = 1.62m3
Total concrete in foundation = 1.62 + 0.35 = 1.97m3 approximately 2m3
Cost of 1m3 of concrete based on data = ₦32,000/m3
Cost = 32,000 x 2 = ₦64,000

Cost of reinforcement
Since the reinforcement is not much i will use a factor of 80kg per m3 of concrete. In this case 1.62m3 of concrete will give 130kg of reinforcement
1000kg cost ₦230,000 to buy,
Ironbender will collect ₦20,000 for every 1000kg
And he will use approximately N10,000 worth of binding wire. Adding all up we have ₦260,000/1000kg
So 130kg will cost me ₦33,800

Cost of formwork
Total of 13 nr 1 x 12 planks required at ₦1,500 each; = ₦18,000
Total of 30 nr of 2 x 4 planks at ₦500 each; = ₦15,000
Nails of ₦1,500 required
Carpenter will collect ₦500/m² ; = ₦5,000
Total on formwork = ₦39,500 for 10 metres

Summary
Cost of 10meter foundation = N142,300
Therefore 1meter foundation = N14,230

Superstructure
Block wall
Area for blockwall = 2.5 x 10 = 25m2
In 25m2 of wall there is approximately 225pieces of blocks each costing ₦240
Total cost of blocks = ₦54,000
Bags of cement required for setting 225 pieces of blocks is 5 bags, each costing ₦2,600
Total cost of cement =₦13,000
3tons of sand is required to set 225 pieces of blocks
20tons of sand cost ₦50,000 there required sand will cost ₦7,500
Cost of blocksetting for 10m of fence is ₦74,500
Cost of same for 1meter is ₦7,450

Columns
There are 4 columns in my designed length
Concrete in 4 column = 0.53m3
Reinforcement in column = 80 x 0.53 = 42.4kg
Formwork to sides of column, each column needs 2 planks, total of 8planks required at ₦1500 each, labour with other materials should be around ₦640
Cost for columns
Concrete = 0.53 x ₦32,000 = ₦16,960
Reinforcement = 42.4 x ₦260 = ₦11,024
Formwork = 8 x ₦2,100 =₦16,800
Total is ₦44,784 for 10m
1 metre of fence will cost ₦4,478 in columns

Summary
The superstructure of the fence block setting and columns only will cost ₦11,928 per metre

Usually on most of our private lands we only do the substructure and superstructure to secure the land. Finishing only comes into play when we move in, as such i will leave this calculation at this level.

In summary to arrive at an estimate of what it would cost you to build a fence around the perimeter of land you can use this estimate.
First measure out the perimeter of the land in metres, then multiply by the cost calculated above.
From my calculation s above a fence based on my designed example will cost ₦26,158 per m² to build.

Example:
From the design plan shown, the total perimeter of the site is = 29.4+13.7+26+13.2= 82.3m
The cost of fencing the plot will then be
82.3 x ₦26,158 = ₦2,152,803.

based on the height of the proposed fence, as well as the type of foundation to be used the rate (₦26,158) will vary i.e be more or less

You can use data provided to make a projection.
Cheers

essenceplus:
Can you help me in making this projection?

Cost of fencing


1. 3 plots


2. 1 Acre


3. 2 Acres

uwemjack:
You can use data provided to make a project.

is the data meant for fun ?

You can use data provided to make a projection.
Cheers

sexy74:

Nice one, I will appreciate if you could talk about fencing a compound of about 550sq meters, block wrk and cement required

Fun in what sense?
I designed a fence using my parameters and i arrived at an estimate.
I did an example with a survey plan i believe that should suffice for what you need to make your projection.

essenceplus:



is the data meant for fun ?

uwemjack:
Fun in what sense?
I designed a fence using my parameters and i arrived at an estimate.
I did an example with a survey plan i believe that should suffice for what you need to make your projection.

Ok sir.


Thanks

For those who want to know materials required
For total number of blocks multiply the area of the wall by 10 will give you the required quantity.
For bags of cement you will need approximately 1 bag of cement to set 50 blocks
For sand you will need a trip of 20ton sand to set 1500 blocks.

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In terms of paying labour for setting the blocks.
Two options
- you can pay them per block between ₦45 to ₦50 per block or
- daily payment but with a minimum of 100 blocks layed per day

How to estimate cost of painting.

uwemjack:
Example:
From the design plan shown, the total perimeter of the site is = 29.4+13.7+26+13.2= 82.3m
The cost of fencing the plot will then be
82.3 x ₦26,158 = ₦2,152,803.

based on the height of the proposed fence, as well as the type of foundation to be used the rate (₦26,158) will vary i.e be more or less

Because of inflation this rate is no longer valid.
However using current prices and same parameters above should arrive at a valid rate