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generally structural steel is more expensive than concrete. so the proposed steel staircase would cost more than having an RC staircase. in order to reduce the structure loading on the existing house structure for the attic, the builder is proposing steel column and beams for the attic roof hence also reducing the amount of reinforcement needed to the foundation or/and existing columns and beams. are you planning to have this as your retirement home? if your plan is just stay a few years and then sell, then don't bother wasting money to shift the stairs if you are not putting in a lift now. if you have been to industrial areas, you would see that most industrial areas have similar fencing. search online for BRC fence and you would know what I'm referring to. downside is slightly less privacy but if you are into gardening, then can plant some small trees or creepers to maintain the privacy. plants also have the effect of cooling down the environment as well. if fence is not your thing and you want high privacy, then just built the brick wall. wall finishes I can't comment too much as not sure how much coverage is needed for your house. sanitary and plumbing seems fair. just make sure that all existing waste pipes are replaced with new ones. electrical works seems fair as well. double check that network points are provided for in each room and the kitchen as well. kitchen is latest requirement from IMDA. if possible request for double network points in each room so that you can have 1 for computer/data and 1 for TV set top box. aircon 30k sounds fair assuming that all rooms have wall units and 2 ceiling units for the living room. don't think you are getting ducted aircon for 30k carpentry 50k sounds fair. but could be minimum works though and customisation could cost more. sanitary 14k sounds high though unless you are provided brands like Duravit or Toto. if you think the overall cost is too high, get quotations from a few other builders to compare. don't just settle on the first one you get before doing comparisons.