If you live in a bungalow house, you probably would not have enough space to enjoy especially when your family is growing bigger in a faster phase than you expected. Second storey additions can give you double the space that you need. In fact, you can have triple of the space should you decide to convert your bungalow to a three storey house.
Apart from meeting the legal requirements set by the local government, you would need everything else in your house reconfigured as its previous work plan would not work anymore. Complete electrical rewiring, new plumbing installations and furnace upgrades among others. Whether you like it or not, all these would require a big fund from you.
Professional workers are needed to get this type of job completed. It might take some time for everything to be completed and so the safety of the workers must be properly addressed. While they are toiling on the upper levels, having a safe void protection system would be a great help. This can keep workers from falling. Thus, they can avoid injuries which can cause additional expenses on your part.
Workers building your house could not be skilled in this. Some workers may know a little about it but you cannot be assured that they will do it the right way. It is best, then, to hire a service provider that is credible about installing systems like this.
As for the design of your would-be new house, there are some things in the first floor which must remain the same so that you can save money. The kitchen and the bathroom are examples of these. You can have an entirely new design for your second and/or third floors. Do consult professionals regarding this one to ensure security and stability of your new house.