If you need to replace the roof on your garage, you may have the option on fitting a flat roof or a pitched one. There are advantages and disadvantages of both and you will need to do your research to find out which one is going to be most suitable for you.
Often people prefer to have pitched rooves so that it matches with the roof of their house. This can give the exterior of the property a uniform look but pitched roofs are often more costly.
Always ensure that you use a professional roofing company when it comes to having a new roof installed on your garage. You need to know that is it going to be water tight and built to last. Most good firms will give you a long warranty on the roof and any leaks that occur during that time, will be repaired free of charge.
If your old roof contains asbestos then you will need to have it professionally removed and disposed of. This can cost quite a bit extra, but never be tempted to cut corner and do it yourself or not dispose of it responsibly as asbestos can be a very dangerous substance.