Permission is required if you plan to extend or alter the roof space more than specified limits and conditions: 1  Volume increase of 40 cubic metres for terraced houses or 50 cubic metres for detached & semi-detached houses. ( 2 2-3 bedroom houses generally will be OK for dormers). Volume increase of 40 cubic metres for terraced houses or 50 cubic metres for detached & semi-detached houses. ( 2 2-3 bedroom houses generally will be OK for dormers). 3  No extension beyond the plane of the existing roof slope of the principal elevation that fronts the highway (i.e. no dormer to face the street).
The rules haven't changed in a few decades, but the customs have. In both houses of Congress, you still need a majority (50%+1) to pass a bill. In the House of Representatives, that's the only consideration. In the Senate, the rules are a bit more complex. If the bill makes it to a vote, it needs only 51 votes. But you need to debate before it gets to a vote.
To override a presidential veto, a supermajority vote of two-thirds of the voting members of each house, the House of Representatives and the Senate, is required. There are 435 voting representatives in the House. If all these representatives voted, it would take 2/3rds of 435 = 290 votes to override a veto.