On average, simple solid wood or metal bed frames cost around $200 to $300. However, this often doesn’t include a box spring or mattress foundation, which can add an additional $500+ to your price tag. Casper’s six unique bed frame-support system combos can fit a range of budgets, from $250 for our simplest foundation to our most luxurious upholstered design starting at $1,395. Adjustable bed frames cost anywhere from $1,000 to $3,500 or more—Casper’s innovative design starts at just $945.