The cost of dreadlock extensions vary depending on many factors. Pricing often takes into consideration a range of variables including type, quality, length, amount, thickness, color, etc. There’s no easy way to answer this question, but you should generally be expecting to pay around $300-800 for dreadlock extensions and a separate cost of $300-600 for the installation. Every vendor and every stylist varies, so you’ll have to contact stylists and vendors to determine specific pricing for your needs.