Another piece of advise, When you buy a plot dont fence it immediately , its waste of money as the fence will likely come down during the construction and you will need a fence when you finish construction instead mwanga mawe and get drawings with the fencing money first.
Fencing an eight acre can cost you up to Ksh40000-50k in Nairobi/ mavoko.

But make sure that you keep on visiting the plot frequently lest cons invade your plot. Also create a rapport with your soon to be neighbours so that they can report to you anyone trying to trespass into your land.

Did they give you a business card with contacts...their website doesn't give physical location or email address. If you have please share. thank you!

I don't know if that's cheap especially that u want to build the whole house with sh.420,000. Roofing is supposed to take up to 10% of the whole cost of construction. If u were roofing the usual timber truss way with whatever roof u choose and it costs u sh.160,000 to do so, then it would mean u were building a house that costs around 1.6 million or thereabouts. If this new roofing technology is cheaper, that would mean the sh.160,000 shillings(what it costs to roof a 2 bedroomed house with the complete roofing unit made with the new technology) would be the cost of roofing for a house that would cost way above 1.6 million shillings, it's the only way it would be considered cheap.Well! i stand to be corrected or maybe the people who came up with the maths about roofing taking up to 10% of construction cost should do some revision.

If fencing a 50x100 plot costs 40-50K, how would construction of a house in the same place cost 420K.

In syokimau that kind of money (420k) is what it would cost to do a foundation of a basic bungalow.

Granted with that kind of money one could do a make believe hse (the type you see upcountry) on red soil. One would have to use very basic material - where quality is not a factor.

Lets be practical folks.

what would be the cost of the foundation? i know the foundation takes quite a big part of the total cost of costruction especially if your plot is in a place that has cotton soil.

This 2 bedroomed house was constructed at a cost of KES 850k inclusive of fencing, external works, landscaping, plumbing, electricity, wardobes e.t.c. This was constructed between May 2011 and September 2011.
http://www.a4architect.c...mond-house-at-kiserian/
The cost could have been lower if the owner requested the design to remain similar to the original Diamond House design that has a flattish roof design,Louvre windows and uses Masonry instead of RC where necessary.
http://www.a4architect.c...iamond-house-plan-cost/

A further construction cost reduction on top of using the Diamond House type can be achieved by using interlocking Stabilized Soil blocks for walling instead of stone since you will save on transport and plaster if your plot does not have black cotton soil.

@a4architect,
Does this cost include construction of the septic tank?

@Wazuans
Anything is possible but there are things to consider, talking from experience
1) A house costing 420K will be quite basic coz you will have to compromise on quality. Be sure you will be comfortable in this kind of house especially if used to better houses. Sort out wife and kids part also coz they will live with them in this kahouse of yours
2) Be careful with theoretical advise, if you have never constructed, be careful what you advise others coz the theory rarely traslates to practical.
3) Expect some variation on materials and labour costs, many have constructed and left their houses half-way.
4) @user, you appear quite determined, this is good coz many fear trying, but trend carefully on this one and do not be too sure
5) Please share the experience once done

@ Chaka. This includes septic tank, outside shower plus toilet, landscaping, electrical wiring, plumbing, steel doors, burgler proofed windows .
http://www.a4architect.c...amond-house-at-kiserian/