(a) Explain "Center Line Method" of building estimates in detail. 

(b) Prepare a Rough-cost estimate based on unit costs of per unit plinth area basis of a five storeyed office building having a carpet area of (1850+ sq.m. for obtaining the administrative approval of the Government. It may be assumed that 35% of the built up area will be taken by the corridors, verandas, lavatories, staircase, etc. and 8 % of built up area will be occupied by walls. The following data is given: 

►Plinth Area Rate Rs: (1100.00+ ) / sq.ft 

►Extra for special architectural treatment 0.6% of the buiding cost. 

►Extra for water supply and sanitary installations = 7% of the building cost. 

►Extra for internal installations 12% of the buiding cost › 

►Extra for electric services = 12.5% of buiding cost 

►Extra for sui gas services 8 % of buiding cost 

►Extra due to deep foundations at site = 1.0 % of buiding cost 

►Contigencies = 3.5 % overall 

► Supervision charges 10 % overall 

► Design charges 2.5 % overall (10, 15)