House extensions can be a lot of work and money too. But they are generally cheaper to do than buying a new home. With a home extension, you can virtually simply add the specific part or space requirement lacking in your with fewer hassles. Nevertheless, the amount of work and money needed would also always depend on how much work you intend to be done in your house extensions. The simpler your house extension is, the faster and the cheaper it would be. Like any of the other building, house extensions must be planned and done by professionals though.
House Extension versus Buying a Bigger Home

People simply prefer doing a house extension with a belief that it is cheaper. But again, this would depend on the extent of the house extensions you require. The advantage of doing a house extension really is that paperwork is usually simpler and easier to accomplish. If you buy a new house, there would be many fees and paperwork to deal with. It would take more time before you can finally move into the new home. House extensions can be accomplished faster with the right contractor. This is even especially so if you need only a simple house extension anyway.

Personal Use versus Market Value

Again, you need to identify the purpose of the house extensions before actually starting. You dont really need to be choosy or to scrimp on budget when the main purpose of the house extension is to add a function or space in the house because the focus on such house extensions is you and your family who are going to benefit from the extension.
On the other hand, if the house extension is done for the purpose of increasing market value of the property you are looking to sell then you have to choose the house extensions that really add great marker value. After all, you need to choose the investments that come with the highest returns always.

Cost versus the Purpose of the Extension

Again, if the purpose of the house extension really is to increase the market value of the house you should mind your budget so as to get better returns to your investment. But then the value of house extensions for the purpose of improving the quality of living in your home is measured by the amount of convenience and enjoyment it brings. So, the answer as to whether the cost is worth it would depend on how important and how useful the addition is.

Time Constraints

The choice to build extensions is great if you are not in a hurry and the extension is not so big. If you are going to virtually another house, it would take too long to finish so its usually better to buy a bigger house instead. Still if for sentimental reasons you want to stay in your home, you would have to wait until the whole extension is accomplished.

On the other hand, if the extension is quite simple it would generally get done faster than having to deal with the paperwork and legality of buying a new home. So its quite practical to do the extension instead. Still, the choice is yours in the end. Its only better that you know your choices and you consider each so you can make the best choices.