While an extension can increase the value of a home, a conservatory can be built for far less money. In most cases, the cost of a conservatory will be less than that of a similar-sized single-storey extension. It may be argued that the cost-benefit analysis favours an expansion because it allows you to build more usable areas that can be enjoyed throughout the year. Obtaining the necessary permits before beginning construction on an extension might help you prevent headaches down the road if you need to make any changes to your home's footprint. On top of that, problems or design adjustments may result in unexpected expenses, which aren't factored into the fixed price of a conservatory.