Hi
1) Any approved plan issued by BBMP will have floor plan details (Carpet area, built up area, common floor, lifts, staircase, emergency exits etc)
2) The flat numbers mentioned in approved plan are only indicative and NOT Final.
3) As long as the floor plan and flat locations are exact replica of each other, there is no problem.
4) Also since there is no deviation from the approved plan and actual construction, your builder was able to get the Occupancy certificate.
5) Now Flat numbers are decided by either the builder or by the flat owner association at the time of handing over of possession.So your builder is technically right in allotting door numbers and incorporating the same in sale deed.
6) Once the flat numbers are mentioned in the sale deed, then BBMP based on the flat numbers mentioned in the sale deed will
a) Assess the flat (measure the flat area) for levy of property tax.
b) Allocate an unique property tax assessment number for levy of property tax.
7) Like wise electricity department will also issue
a) independent electricity meter based on flat number
b) issue independent electricity connection based on flat number mentioned in sale deed.
8) You can go ahead with the sale deed.
9) You should ask the builder to register the sale deed that mentions both (Flat number in brochure and flat number in Approved plan) and also ensure that the brochure is annexed to the registered sale deed and there by becomes a part of sale deed.
Hope this information us useful