Author: A4KENYA

PRISM DESIGNS AFRICA
www.a4architect.com

Phone: +254 721 410684

Karen road,

Nairobi.

info@a4architect.com

Cost of Iron Sheets in Kenya.

Iron sheets in Kenya are sold in modules of 2m, 2.5m and 3m lengths with widths of 0.85m.
Available iron sheets come in gauge 30 and 32. In the earlier years, gauge 26 iron sheets were available but currently, these have to be ordered directly from the major iron sheet manufacturer factories.
Actual fitting will also have an overlap of approximately 150 to 200mm.This reduces the actual coverage on the roof.
The lower the gauge, the thicker the iron sheet.

Gauge 30 .

2M length of gauge 30 costs kes 470 in an average hardware shop around Nairobi.
This translates to kes 277 per m2.

Gauge 32.

2M length of gauge 32 costs kes 410 in an average hardware shop around Nairobi.
This translates to kes 242 per m2.

Gauge 30 box profile prepainted.

2M length of gauge 30 costs kes 760 in an average hardware shop around Nairobi.
This translates to kes 448 per m2.

Francis Gichuhi Kamau, Architect.
info@a4architect.com
0721410684.

Accidents in Construction Sites In Kenya.

Accidents within construction sites can be categorised in the below categories.

1. Foundation accidents.

These occur when the excavated ground opens up pockets of Sulphur dioxide or other poisonous gasses. These gasses poison the labourers as they dig the foundation . Areas such as Ngong town are prone to such pockets of poisonous gasses under the ground.
Also, the foundation walls can collapse and burry the labourers while digging deep foundation pits or septic tank pits.
At ground level, accidental stepping of nails is very common. This injures the foot.

2. Walling.

Walls can collapse and injure people nearby. Such cases occur when masonry walling has been stacked up more than 4 courses high within a day. The mortar will still be wet hence not strong enough to bring the stones together.
The formwork that the labourers use to stand and place the mortar on can sometimes snap and lead to a fall.

3. Roofing.

During the hoisting and placement of roof trusses, the temporary wooden joists used to temporarily hold the trusses usually break. This leads to the heavy wooden trusses pushing people to the ground from the roof area. This is especially fatal fro ground plus 2 and above heights.
Also, during laying of the roof cover, labourers can accidentally slip and fall to the ground. The fatality depends on the number of storeys of the building.
Also, objects can accidentally fall from heights and injure the workers at the lower levels.
Also, nails tend to ricochet especially when using hard wood such as blue gum .This can lead to serious accidents to the people around.

4.Electrical services.

During electrical wiring, it’s common for labourers to be electrocuted in the course of their work.

5. Finishes.

Works such as painting, plastering, ceiling fixing require that labourers stand on formwork to reach the top most parts of the wall and ceiling. If the formwork is not firm enough, it can snap , leading to dangerous falls.

Prevention.
Careful consideration and evaluation on the type of formwork is essential. Use of helmets , boots and overalls is also a good method of preventing accidents.
First aid boxes should be within reach within the site.
Use of the right, well trained personnel for a particular task and use of the right tools for work needs to be enforced and implemented. For example, a mason should not try to work on the roof since his skills are not appropriate for the task.

Francis Gichuhi Kamau, Architect.

http://www.iam-architect.com/2013/04/awarded-contemporary-home-with.html

1/4 acre plot in Kenya. Number of 2 bedroomed units for rent and cost of construction.

A 1/4 Acre plot has the rough dimensions of 100ft by 100ft or 30m by 30m.

Number of 2 bedroomed units.

For a high class type of construction whereby rents are high, e.g. in up market areas or near major towns and highways, the 1/4acre plot can fit 4 units per floor for 4 levels =16 units in total.

For middle class type of construction e.g. 0.5 to 1km away from tarmac or major town, the 1/4 acre plot can fit 6 units per floor =24 units in total.

For low class finishes type of construction, this can fit 8 units per floor=32 units in total for four floor levels.

Cost of construction.

High class.

For high class finishes, a cost of between kes 35,000 to 45,000 per m2 is envisioned.
Each unit can be 90m2 in size. This estimates a cost of between 3 to 4m per unit.
Assuming rental income of kes 30,000 per month, this will repay itself in between 9 to 11 years.

Middle class.

For middle class finishes, a cost of between kes 25,000 to kes 35,000 per m2 is envisioned.
Each unit can be 60m2 in floor area. This estimates a cost of between 1.5 to 2.1m per unit.
Assuming a rental income of kes 15,000 per month, this will repay in between 8 to 11 years.

Low class.

For low class finishes, a cost of between kes 18,000 per m2 to kes 25,000 per m2 is envisioned.
Each unit can be 40m2 in plinth area. This brings out a cost of between kes 720k to 1m per unit.
Assuming a rental income of kes 10,000 per month, this will repay in 6 to 8 years.

Francis Gichuhi Kamau, Architect.
info@a4rchitect.com
0721410684

How to reduce cost of construction in Kenya.

A Holistic approach whereby all the elements of a building, namely foundation, walling, roof, window/door, finishes and external works/services needs to be involved. A small amount of savings can be obtained in each of these elements so as to ensure a conclusive eventual savings.
When these elements are optimized, up to 40% of the construction cost can be saved.

Foundation.

Careful analysis should be carried out to ensure that the type of foundation chosen will ensure a savings.
Grounds vary in type. There are specific foundations for marshy grounds, red,black ,murram soils etc.
Once a survey is carried out, it’s possible to obtain between 5 to 10% of savings from this choice.

Walling.

A proper analysis on the type of walling required should be carried out between the client and architect . There are various choices such as zero jointed walling, machine cut walling, glass, SIP Panel, wood , Stabilized soil block depending on the desired outcome.
A 5% savings can be derived from here.

Roofing.

Type of roof frame, surface area of roof and type of roof cover can be used to reduce cost.
A 5% savings can be achieved here.

Windows, doors and Finishes.

Creative interiors such as full glass windows, unplastered walls, patterned cloth ceilings, wooden/offcut wall stickings, mazeras wall renderings etc can create savings.
Up to 10% of construction costs can be obtained here.

External works and services.

Use of masonry wall pillars instead of reinforced concrete for fence, well designed septic tanks and well designed gates can lead to approximately 5% of savings.

In total , up to 40% of construction cost can be achieved in each of the various classes of construction i.e. low, middle or high class construction cost. Careful floor planning that reduces wasted space in the building also goes a long way in ensuring savings.

Francis Gichuhi Kamau, Architect.
info@a4architect.com
0721410684

Cost of construction in Kenya.
Construction costs in Kenya can be divided into 3 classes.
1.High class
2.Middle class
3.Low class.

High class.
This type of construction ranges between kes 35,000 per m2 to kes 60,000 per m2.
This type of construction is seen in the highrise blocks in upper hill, Westlands and the residential in Runda, Muthaiga, Karen and Gigiri areas.
These are also seen fronting major tarmac roads near major towns.
The main finishes are patterned external masonry walling, stone coated steel roofing tiles, textured paints, European kitchens and sanitary fittings and hardwood doors.

Middle class.
This range from kes 25,000 per m2 to kes 35,000 per m2 construction cost.
This type is usually seen in areas such as Ongata Rongai, Kitengela, Juja, Kiambu and Umoja.
These are also seen 0.5 to 1km from tarmac near major towns.
This type of building is characterized by use of materials such as machine cut walling, clay and concrete roofing tiles, Chinese sanitary fittings , flush doors and softwood door frames.

Low class.
This cost ranges from between kes 15,000 per m2 to kes 25,000 per m2.
This type is usually seen in areas such as Kayole, Mathare north, Githurai and generally over 1km off tarmac in major towns.
Determinant factor.
The distance from tarmac and proximity to a major town is the main determinant to the type of class of building. Local Government zoning restrictions also determine this e.g. Karen has been zoned to fit the high class compared to Dagoretti corner, Racecourse area whereby the zoning controls have allowed middle class high-rise flats .

Francis Gichuhi Kamau, Architect.
info@a4architect.com
0721410684