You can buy replacement garage door springs from several sources including home improvement stores, garage door dealers, and online retailers, but you must buy correct size and type for your door to ensure safe operation. Home improvement stores like Home Depot and Lowes carry extension springs and some torsion springs in store and online, with extension springs for 7 foot doors costing 20 to 40 dollars pair and torsion springs costing 50 to 100 dollars each, but selection limited to common sizes. Garage door supply companies and local garage door dealers sell springs and can help you size correctly based on door weight, height, and wire size, which is recommended for safety and proper balance, and they often offer high cycle springs rated for 20,000 cycles. Online retailers like Amazon, eBay, and specialized sites like Garage Door Nation, DDM Garage Doors, and North Shore Commercial Door sell wide range of torsion and extension springs with measurement guides, costing 30 to 80 dollars per spring, but you must measure old spring's wire size, inside diameter, and length accurately to order correct replacement, as wrong size causes door unbalanced and dangerous. Professional installation is strongly recommended due to high tension danger, and many dealers will sell spring only if you are professional or include installation costing 200 to 400 dollars. Avoid buying used springs. When buying, consider pair of springs even if one broken, as other near end of life.
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