Describe the building element by element, with real dimensions. Every block, cement bag and kilo of steel is derived from your geometry, not from an average.
This is the mode to use once you have drawings. If you do not have any yet, start with the quick estimator. Quick estimator
Substructure
Reinforced concrete cast in the trench, under the load-bearing walls.
All footings added together, perimeter and internal walls.
Substructure
Floor slab cast over compacted hardcore.
Superstructure
One wall, or a set of walls of the same type. Deduct the openings.
Doors and windows, deducted from the wall face.
Superstructure
One wall, or a set of walls of the same type. Deduct the openings.
Doors and windows, deducted from the wall face.
Superstructure
Reinforced concrete columns, all of the same section.
Superstructure
Ring beam, lintels and beams, of the same section.
Roof
Structure and covering, from the plan area and the pitch.
Finishes
Cement render on masonry, internal or external.
Finishes
Tiles, adhesive and grout on screed.
Finishes
Acrylic paint on render, primer included.