Increasing the living area of your home by converting your garage has benefits. However, without proper execution, it could end up a disaster and even devalue your home. 

Don’t underestimate the time and cost involved to do the job properly. Yes, it’s going to cost less than building an extension from scratch but it does still need to be done within building regulations. Depending on what you will be using the garage conversion for, it’s almost certainly going to need new electrics and heating especially if it’s going to house a new kitchen or bathroom. Converting your garage isn’t a DIY job you can do on weekends. For it to function properly it’s going to need some professional expertise. If it is a detached garage you are converting into a separate flat or business premises then you will almost certainly have to gain ‘change of use’ permission from the local authority.