These contractors are available for labour contract /full contract for stand-alone residential units such as the Diamond House type
http://www.a4architect.com/diamond-house-plan-cost/
1. Mr. Barasa 0720533590
2. Mr. Chege. 0725857344
3.Mr. Jogoo 0723728101
4.Mr. Ngigi 0721415859
5. Mr. Kerai[plumbing & Electrical works] 0719819543
6.Mr. Madaraka 0721855254
7.Mr. Ngala [fitings,woodwork] 0726472183
8.Mr. Mwangi 0726740332

Other residential house contractors.
Feel free to add your CV , previous works and contact referees here below.