Some of the time, when boot zippers mess up, you can just fiddle with them a bit and they get fixed. However, they can eventually break completely with no chance of repair. In such case, you can bring your boots to a shoe repair shop and have them replace the boot zip entirely. It can cost around £24 on average but can go upwards of £36. You can expect repair shops to carefully remove the old zipper and stitch in a new one.
Price to Replace a 12-inch Nylon Boot Zip
Average Price: £24
Top Price: £36
Zippers are all prone to breakage. This is why boot zip repair and replacements are a common job for many cobblers.