What I will advice you to do, as an experienced building professional, is to put a call to your builder, contractor or a quantity surveyor to have a good look at you building plan, then consider where your building will be located and then give you a quotation. Ask them to break the quotation down to smaller, manageable milestones. The location consideration is very important because costs rise or fall in some locations because of different conditions prevalent in the location.
These milestones could be few, for a typical bungalow, ask for 3 stages, for a duplex, ask for 5 stages, and so on. These are just for the construction of the skeleton of the building only. For example we can divide a duplex thus;
1. Foundation and DPC stage
2. Ground floor block wall stage
3. Decking stage
4. First floor block wall stage
5. Parapet and roofing stage
Out of the bulk sum earlier given, let the costs be broken down and allocated to each of the stages, dont forget to add timelines for completion. This will make the work measurable, and thus easier to monitor.
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