The foundation and frame are the most expensive materials when building an addition to the house. Both are necessary for a safe and sturdy structure, and you have less room to maneuver to choose cheaper options. On a larger scale, the labor cost to build an addition can also exceed the cost of materials, but this is highly dependent on your design. You should know that a brick sheet extension will cost less than a wooden frame extension, and that a double brick extension will cost the most.
In conclusion, the most expensive part of building an extension is usually the construction and material costs. This includes labor costs, as well as the cost of bricks, concrete, roofing materials, and any necessary structural work. It's important to remember that each project is unique and that costs can vary depending on factors such as location, size and desired finishes. Therefore, it's crucial to thoroughly research and plan your extension project to have a clear understanding of all the costs involved before starting. The cost of equipping a two-story extension will largely depend on the type of room you add: a kitchen on the ground floor will be more expensive than a living room; adding an additional bathroom upstairs will be more expensive than another bedroom or a home office, for example.
