When money's tight, homeowners aren't willing to pay for an all-out bathroom makeover. A good alternative is to offer a full menu of low-cost improvements that go a long way toward improving appearances. Your goal should be to give your customers the biggest change for the buck. Bathroom facelifts alter surface appearances only. The first rule is to disturb the interior envelope of the room as little as possible. Structural changes, even minor items like putting in a bigger window, will almost always entail a succession of trades — tile subs, carpenters, drywallers, and so on — to make things right again. To keep costs low, limit yourself to items you can do yourself or that you can hire one tradesperson