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.
There seems to be some confusion in the press over how many votes will be needed to override President Bush's veto of the SCHIP bill. It's pretty much basic arithmetic. There are 435 members in the House. You need a 2/3rds majority of all voting members to overide a veto. So at most, 290 members will have to vote to override. That's all we know for sure. 265 members voted for the SCHIP bill the President vetoed. But 11 members didn't vote. So that means that 18 members would have to switch their votes to override the bill. Or let's say all 11 members who didn't vote decide to support it.