For last few days, there was Kenya Home Expo @KICC of the many booth, I visited, my attention
was focused on 2 of them:
1. Where EPS building technology was being showcased.
2. Where interlocking blocks were showcased.

Am interested in above cases as either of them is promising a cost cut upto 30% less.

Some of the way of cost cutting measure promised by the above technology are;
1. Reducing the number of Fundis/and days spent at the site.
2. Reducing the amount of building materials (Sand & Cement) needed esp in case of interlocking blocks.

Bone of contention
However the bone of contention is when I suggested either of this to my contractor cum architect.
Unfortunately, the contractor rubbished both of the options and insisted on Ndarugo stones.

My Fear
Could it be true that, my contractor is opposing the techonology just because he want to extend the time he spend in site
and the fact that he is involved in supply of material?

Fellow Wazuan, help your brother in need to figure this out.

To be fair to your contractor, there is always a slight learning curve when it comes to new stuff - unless you are planning to get a new contractor experiencde in the same, you don't want the fundis experimenting on the new technology on your house.

Still for a single unit I don't think there is much difference, unless you are putting up many units, so your contractor might be right in the single unit sense.

What is a contract?
To me it means having to construct the aid house according to the brief given, which in most cases is costed(Bill of Quantities) before being awarded to the contractor.
Any person would not like changes along the way as this exposes one to the risks they were not privy to when the job began.

If one wants to introduce a new technology, it's advice able that it is done at design stage so that when engaging a contractor they are fully aware of what they may be facing,