Not really. You are just conditioned by the building trades who focus only on penny wise pound foolish. If everyone does it by incorporating it in the pre-planning stage, the additional costs are very minimal. In many cases, it will actually be cheaper.
Look on the bright side. It will be easier to move belongings and furniture into the house, you can get an oversized refrigerator and giant beer kegs, and in the bathroom you can more readily install heavy duty exercise machines or fancy Swedish sex apparatus. Not a bad deal at all.
Any chance the above could become law, "Honest Hun, it's in the building code!"
Yes, but now that these rules been codified, it's just a short step to requiring you to make changes for "reasonable accomodations" to your existing house before you can sell it.
I mean, after all, if you are selling a house that cannot be immediately occupied by a handi...oops! disabled person then you are effectively practicing descrimination.</sarcasm>