@ Vin
Possibly it would be better to do the house in stages. I.e. gather enough for your foundation then take time to regroup. Once well rested do your walls and rest again. That way until you’re done with roofing and finally finishing.
Your problem would be when to know how much to accumulate for a particular phase.
For walling use the following – 1 fundi (with two kyms) can do 80 - 120ft of walling per day. During that period they will use 1 bag of cement. Based on the mixture ratio you can estimate how much your walling will be.
I.e Your hse is 1,400 sq ft meaning the perimeter would be about 160ft. for 9 courses that comes to 1440ft. Interior walling could be another say 600ft. Total 2000ft.
If your fundi does even say an average of 80ft per day then 2000ft needs 25 fundi days i.e. 25 bags of cement (@740 per bag = 18,500. Add to that a lorry (18-20 tons) of sand @22k and Water. Labour would cost you 25 x 600/- (fundi) + 25 x 600/- (2 Kyms) = 30,000/-. Add the cost of stones and a few other things incl. an engineer to check the work (@3k per visit)
You can see your walling will cost you about
Stones - 44,000/- i.e (22/- x 2000 your fundi can give you a better estimate, Machine cut)
Stones - 30,000 Transport from the Quarry @
15/- per stone
Cement – 18,500
Sand - 22,000
Water - Depends
Labour - 30,000
Eng/Arc - 10,000
Total 154,500
Add about 10% for hoop irons & ring beam (just before the roof)
I am not claiming to be an expert but even if I am 10% wrong you can still see how cheap it is!! – These are the houses your developers sell to you for 3.2M.
@Tom Boy
A 24k water Roto tank is costs 205k (VAT Incl.). To get 60K litres you need 2.5 of these which will cost you 512k. My problem with these is that they are really huge tanks and do not look good in a manicured compound. The one I have cost me about 280k.