After the design phase, prospective homeowners will be left wondering about the number of blocks they will require to complete construction. It is highly advisable to use trusted professionals who are highly skilled for the building project to save you time and money. If you intend to take charge of material procurement or you just wish to find out the required number of blocks you will require for your project, follow the steps outlined in this guide.

To calculate the blocks needed to build your house you calculate the wall areas and divide the total wall area by the area of one block. This method will enable you to calculate the number of blocks needed to construct your house, whether it is a 1,2,3, or 4 bedroom. Let’s break this formula down step by step below. The figures used in the guide below are for illustration reasons, you shall replace them with the custom figures of the house you plan to build.

  1. Find the total wall area by taking the length of the walls and multiplying it by the wall height.

    That is: ( Area =Length x Width )

  2. Calculate the length, using the length of vertical walls first, i.e. left to right, then horizontal walls (top to bottom)

    Here is an example using our figures:
    • Wall A= 8000mm
    • Wall B=7755mm
    • Wall C=3675mm,
    • Wall D=4100mm
    • Wall E=3900mm
    • Wall F=7950mm
    • Wall G=3525mm
    • Wall H=5975mm
    • Wall I5600mm
    • Wall J=4425mm
    • Wall K=4200mm

  3. The perimeter of the wall is 59,105 mm.

    The sample perimeter of our wall is 59,105 mm

  4. Use 3000mm as the height of the wall.

    We shall use 3000 mm as our height

  5. Now we find the total area of the wall including the openings

    Approximate wall area including openings =59105mmx3000mm= 177,315,000mm

  6. Subtract the area of the openings from the total area

    We will need to subtract the area of the wall openings for the entrance, doors, and windows to get the actual wall area.

  7. There are 6 doors each measuring 900mmx2100mm

    Therefore the total area of the door openings shall be, 6x900mmx2100mm= 11,340,000mm2

  8. There is one window measuring 600mmx600mm and 8 others measuring 1200mmx1200mm

    Therefore the total single window opening area shall be 600mmx600mm=6,930,000mm2
    The total window area of the remaining windows shall be 8x1200mmx1200m= 11,520,000mm2

  9. Now subtract the total area of openings from the total wall area

    The total area of openings is 11,340,000+11,520,000+360,000+6.930,000mm2= 30,150,000mm2.
    Therefore, 177,315,000-30,150,000mm2= 147,165,000mm2

  10. You will also have to remember about the area of foundation walls which depends on the number of courses laid.

    For this building, we have used four courses of block wall as the foundation which is also known as the strip foundation and it is roughly 900mm high. We will have to multiply the perimeter of the walls from the first step by the height of the foundation wall.

  11. The total area of the foundation wall is

    Area of the foundation wall = 59105mmx900mm=53,194,500mm2

  12. Now find the total wall area of the foundation walls and house walls

    The total wall area =Ground floor wall area+Foundation wall area

  13. Now find the total number of blocks

    The area of one block is 225mmx450mm=101,250mm2
    To find the number of blocks, we are to divide the total wall area by the area of one block. Therefore, the number of blocks is 200,359,500÷101,250=1978.86 blocks

  14. That will be approximately 1980 blocks but also remember to add a certain percentage for breakages and cut-offs. If you use high-quality vibrated blocks, you will only need to add a little.

    This guide has been a guide to the formula for calculating the number of blocks needed to build a 1,2,3 or 4-bedroomed house.

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Best Types Of Blocks To Construct Your House

1. Concrete Blocks

Concrete blocks are made by compressing sand or quarry dust mixed with cement. Concrete blocks differ in type and size depending on the making process. Below are different types of concrete blocks;

  1. Solid blocks
  2. Hollow blocks
  3. Interlocking blocks

Solid blocks use the most material compared to interlocking blocks, hollow blocks use the least material. Therefore solid blocks are the most expensive among the three followed by interlocking blocks while hollow blocks are the cheapest. However, solid blocks are the strongest and long-lasting of the three types of concrete blocks. Depending on your need for quality and budget, you can choose the best that suits you among the three.

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During the construction of a house, cement is one of the budget inflators, using hollow and interlocking blocks shall require less cement compared to solid blocks thereby reducing your budget by a reasonable amount.

It is therefore recommended that you use interlocking concrete blocks since they reduce the cost of construction, are lighter, and won’t bring problems to your foundation. Interlocking blocks have actually been found to be earthquake resistant since the interlocking pattern enables them to distribute the earthquake waves equally across the house.

Photo Of Different Types Of Concrete Blocks

2. Brick Blocks

Bricks have been used for the construction of houses in Kenya historically. Bricks are cheap compared to other house construction materials. They are made from mud which is locally and cheaply available. However the production of bricks is labor intensive, still constructing a house using bricks is labor intensive and expensive compared to concrete blocks, they shall use more cement. Blocks are also heavy and might cause issues with your foundation if not used skillfully.

photo of brick blocks

Where To Get Blocks For Building Your House In Kenya

Both concrete and brick blocks can be easily acquired by the many producers and distributors in Kenya. There are a lot of block distributors in Kenya, many in every square kilometer. However, in rural areas in Kenya, you shall have to find a distributor in the nearest town to your home. Always find a block distributor who is nearest to your intended construction site to cut down the cost of transportation. Alternatively, you can find a distributor who offers free delivery, there are many as the competition is stiff. We shall be recommending some of the top block distributors here once we find some incredible ones.

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Frequently Asked Questions About House Construction Blocks

Which construction blocks are the cheapest in Kenya?

Construction Blocks’ cheapness shall depend on your preference. Concrete blocks are slightly higher in price than bricks, however, in construction, concrete blocks reduce the cost of construction as they reduce the amount of cement needed significantly.

Which are the best construction blocks?

The best construction blocks are interlocking concrete blocks. Read the above guide to discover what makes concrete blocks the best to use for your planned construction project.

How many blocks are needed to construct a house in Kenya?

To estimate the number of blocks you shall need to build your house in Kenya, use the formulae we have provided in the above guide.

How many cement blocks do I need to construct a house in Kenya?

1 bag of cement can lay approximately 70 to 80 cement blocks. Use the above guide to CALCULATE the approximate blocks that you shall need to construct your house then approximate the total number of cement bags you shall use.

How many blocks do I need for my foundation?

Use the formulae in our guide above to know the number of blocks you shall need to complete the foundation of your house.

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