Kitchen renovations are among the most expensive home-improvement projects, but it's possible to give a tired kitchen new life without breaking the bank. At the most basic, walls can be painted and cabinet hardware changed to freshen the look. At the high end, you can upgrade cabinets and appliances within the same footprint, which saves the expense and hassle of moving plumbing and electrical lines. Even investing in one great feature — a granite countertop, a pro-grade range, or a vintage appliance — can have a big impact. "A good cosmetic upgrade will more than pay for itself at resale time," says Manhattan kitchen designer Clare Donohue. So if changing tastes or wear and tear has left you with a kitchen in need of a lift, follow this guide to simple and affordable upgrades.