The cost of home additions in the United States starts from $40,000. However, expensive home additions can be even higher than this! In fact, home additions have become a major part of architectural as well as structural firms that provide architectural and structural design services. In this article, we’ll talk about some of the most costly home additions and why they’re so pricey.

Let’s start!


One common home addition that can be pretty expensive is roofing. Adding a new roof to your house can be quite a massive project! If you’re looking to have a new roof installed, be prepared to spend anywhere from $3,500 to $40,000. These figures can also rise depending on the house and roof.

The primary reasons behind the considerable roofing costs are the materials used and the labor involved. Roofing materials can be pretty expensive, especially if you choose a high-end option like copper or slate. And since roofing is such a big job, it requires a lot of labor – which means that professionals will charge accordingly.

Adding New Deck

Building a new deck is another home addition that costs a lot, but it’s also something many homeowners want and worth it. Expensive home additions like a deck can be pretty pricey: on average, expect to pay about $45 per square foot for the construction and installation of your new deck (or pay anywhere between $4,000 and $11,000 for the entire renovation task).

The main reason why building new decks cost a lot is that the process requires such high-quality materials. For example, building decks made of high-quality lumber that is perfectly straight, adequately treated with chemicals to prevent rot or infestation by bugs and other pests, etc., costs a lot of money.

Home Elevator

Home elevators

Installing home elevators is also an expensive home addition. This renovation process can cost anywhere between $2,000 and $60,000. The price can even exceed this limit depending on your elevator’s size, type, design, etc.

These home additions cost a lot of money, but they can be worth it in the long run. Other benefits of home elevators include the fact that they can make your home more accessible for those with difficulty navigating stairs, and they can add value to your property when it comes time to sell. However, if you are considering installing a home elevator, make sure to consult with a qualified contractor to obtain accurate residential elevator dimensions and an estimate of the cost.

Smart Blinds

smart blinds


Consider these expensive home additions if you want to improve your home’s comfort level. These luxury window treatments play an indispensable role in blocking out needless light whenever you’re not in the house.

Besides this, you can control these luxury window treatments with your voice or a mobile app, adding another layer of convenience to your home. Generally, these home additions cost a lot but are worth the money.

Central A/C

Adding central air conditioning unit to your home can be one of the most expensive home additions you make, but it’s also one of the most important. If your summers are hot and humid, or if you don’t like the idea of sweating through your sleep, central A/C is a must-have addition.

The average cost of installing central AC ranges from $3,200 to $7,800. The primary factors affecting the AC unit’s installation costs are the size of your home and the type of system you choose.

If you’re looking for a top-of-the-line system, expect to pay more than if you were to install a basic model. However, even the most expensive AC unit will save you money in energy costs over time.


The above are some of the home additions that cost a lot. Other expensive home additions include kitchen remodel, bathroom renovation, and more. However, all these additions are worth the money because they improve your home’s comfortability and increase its resale value.

In case you have any architectural, structural, and MEP design requirements, or need subtle home additions for your home, feel free to contact us.  We provide you with the full permit set design + T24 for your home additions.