If your balcony needs repairs there are some really important things you need to consider before you make any decisions on how to proceed. Never try to perform these balcony repairs on your own even if you think you can do them, if you tried to perform these balcony repairs on your own you could get yourself into serious legal trouble if the balcony was to fall and injure another person !
What you need to do is seek out professionals that specialize in performing balcony repairs, write down the names of all the professionals that offer these services. When you have identified all of these experts you will need to confirm they are in fact licensed, you should never hire a firm that is not licensed to provide these repairs or you could end up getting into trouble with your insurance provider. If you have an unlicensed contractor working on your property even if it is for simple repairs your insurance will not cover you from any and all claims so this is something you need to take seriously.
Now that you know which of these contractors are licensed you have to find out how long they have been providing these balcony repair services in the community, the longer they have been offering these solutions the more effective they should be but experience alone is not enough you will need to look at the work done in the past. Ask these contractors to provide you with references from former clients they have assisted in the past, while speaking with these clients you should be able to get some insight into the quality of the work offered by these contractors. You will need to ask yourself whether it would be more cost effective to build an entirely new balcony instead of repairing the one you currently have, this is a decision that only you can make so take your time.
The last thing you will need to do is compare the prices being levied by these contractors to identify the contractor with the most cost effective balcony repairs. In this particular situation you need to look for the contractor that has their pricing in the middle, it is not too high nor is it low but in the middle. While all of this due diligence may seem like a considerable amount of work you have invested time and money into your balcony so it behoves you to take this proactive approach to preserve the value and aesthetic appeal of the balcony.