Cost Of Building A Basement: Is it Worth?

Last Updated on October 16, 2021 by

The average price of building a basement is between $18,000 and $30,000. However, the cost differs depending on the location, soil condition below your house, and grading required to achieve the desired size. The contractor’s fees also vary; some are charging low and others high.  

If you have a house and are thinking of building a basement, you don’t have any reason not to carry on with this idea. Basements are a great way to place together some additional room for various purposes such as at-home cinema, a game room, storage space, or a drive-under garage.  There is no drawback to this, except when thinking of the cost involved.  

Well, there are costs involved, but the good thing is that it is not expensive. Plus, the basement typically adds excellent value to your property. So, if you sell in the future, the property is going to be worth it. It is a long-term investment with some benefits that you can’t ignore. 

Basement Cost: What Does It Comprise?

Basement Cost What Does It Comprise

Let start with a list of aspects that can’t be ignored if you plan to construct a basement for your house.  All these are needed and must be taken into account when calculating the final cost:

1. How do you guarantee drainage and waterproofing? You have to take measures against water-related damage. Even though it will increase the cost, it is worth considering. 

2. What will you do with the basement?  An incomplete basement is excellent for storing things that you don’t want to keep in the house.  A complete one offers extra rooms for you, hence adding significantly to the house’s general value.

3. Do you like a walk-out basement? If yes, you have to incur extra costs. 

4. What kind of basement do you prefer?  A basement cost will differ depending on the type you want. The ones with slab design are inexpensive, while foundations can sometimes be more expensive than the house. 

5. You have to test the soil in advance. In some instances, the content of the ground can be challenging and need expensive materials. Conducting a test may cost you around $10 to $100.

6. How deep do you like your basement to be? The basement varies depending on its purpose and so, will the cost.  Excavating below the front line comes along with issues that ought to be addressed – thaw damage, freeze protection, and so on.

7. The place you stay will dictate how much labor will cost. This is a typical economic aspect that you ought to be kept in mind before proceeding with this upgrade. 

Making It Stress-free For You: Basement Cost Calculator 

The excavation cost is between $10 and $20 per square foot. The condition of the soil below your house dictates the price.  Also, the gear used by the excavation team will impact the cost. 

When estimating the cost of constructing a basement, it is always good to consider its purpose. Slap design basements are cheaper than basement foundations. The good thing about the basement foundation is that it has a considerable Return on Investment (ROI).  

Again, it would help if you chose what you want to do with your basement.  The difference is reliable: an unfinished foundation basement costs up to $25 per square foot, while a complete one can go up to $100 per square foot. 

The basement usually adds a living space or storage room to your house.  Besides that, it adds resistance to your home, may keep moisture away, and insulate against the cold. 

Beginning Off: Constructing A Basement For A New House

Constructing A Basement For A New House

For a new building, the price of constructing a basement reduces significantly, topping off at $30000. Many expenses come in due to excavation, but once you begin with a basement plan for a new building, it is much effortless, and the labor rate is lower. Constructors will try to find a great deal that incorporates everything you like to add to your basement. Pay attention to what constructors say, and there is a substantial chance to reduce some costs. 

Replacing A Foundation 

A poorly constructed basement might need changing the foundation at some point.  It is easy to tell how much it cost to build a basement, but it is a bit hard to predict what repairs will be required in the future.  The one way to avoid unfriendly situations is to ensure the basement is constructed well from the start.  A poorly designed foundation is prone to cracking, and the repair price can be a bit higher than reconstructing the cellar. 

If you are constructing a new building, ensure that the basement plan is placed together correctly.  Observe keenly what your contractors are doing and ensure they are doing the right thing. For an existing building, keenly observe the foundation and check whether there are signs of any damage.

The most dangerous sign is cracks and leaking.  Any of this needs repairs that should be considered as quickly as possible to avoid further damage. Foundation repair can be around $400 for a small crack and $11000 for a giant crack that may affect the entire structure resistance of the building. 

Unmanageable repairs will need structural changes or re-building the basement. The cost will be around $20000 for minor changes and $100,000 for serious.

Eventually Winding –up A Basement 

Some individuals choose to leave the basement unfinished and completing it on another occasion. If you fall in this category, the price for winding up the basement can range from $25 to $50 per square foot on average, topping off at $490 for elaborate outcomes. 

For a finished basement, the cost would be around $30,000. The price is worth it, given that the finished basement adds plenty of rooms to a house. Costs differ depending on wall coverings, plumbing, and lighting flooring options, and so on. 

Basement Foundation Pros & Cons

Basement Foundation Pros & Cons


1. Constructed either completely underneath or partially above the ground, basement foundations offer robust structural support to the building. 

2. Work best with houses constructed on slopes

3. Homeowners gain extra living rooms- Sometimes double the preexisting square footage. 

4. The living space gained protects against hurricanes and tornadoes.

5. The basement is warm in winter and cool in summer. This provides comfort to homeowners. 

6. The basement with ductwork in the ceiling provides effortless access for utility work. 


1. It is costly to build and finish out.

2. Without preventive measures, the basement tends to grow mildew or mold or to flood. 

3. The basement can be dark.

Crawl Space Foundation Cost 

A crawl space Foundation’s cost range from $7 to $14 per square foot. Using a crawl space foundation to frame a house costs more compared to the one over slab-on-grade. Numerous constructors recommend constructing a basement instead of crawling space due to the ROI on storage space or additional living. 

The price is a bit costly compared to a beam and pier home because of the extra excavation cost and concrete perimeter walls. The good thing is it protects against water damage. Homeowners may opt to install ventilation areas throughout the perimeter or shut down the crawl space. 

Crawl space foundation pros 

1. It is the best option for houses constructed on slopes in hotter climates.

2. The installation usually creates 18″ – 24″ of space, which gives improved access to ductwork and plumbing. 

3. Valuable in areas susceptible to earthquakes or flooding.


1. Labor-intensive to construct.

2. Energy inefficient.

3. There is a high chance of mobility impairment due to the rise from ground level to the front door.  

Concrete Foundation Cost 

The regular concrete foundation costs $5100 to $15400- for both materials and installation.  The ultimate price will be determined by the size and thickness of the slab and if you add any reinforcement like rebar or wire mesh. 

A concrete foundation is the most straightforward and low-priced foundation for a home. One solid slab is poured for the whole house and does not need deep excavation. 

Monolithic Slab Foundation Cost 

A monolithic slab foundation costs $5 to $14 per square foot installed. It is a concrete slab poured once about ½ a foot above the ground and is thicker perimeter-wise. They can be divided into two that is one-way beam and two-way beam slabs. 

Does The Finished Basement Need An Egress Window?

Yes, a complete basement needs an egress window to be considered and must go in line with codes in your area. Egress windows are among the numerous requirement that a finished basement should include being recognized as “livable square footage” that one can claim in resale. Discuss in detail with your contractor or check construction codes in your area to know the required egress dimensions, height from the flow, and other considerate measures. 

Can You Finish A 7-foot Basement?

It is a requirement by most area building costs for a finished basement to be 7 feet tall-  to attain this; an unfinished basement ought to be taller than 7 feet.  Talk with experienced contractors to see whether your basement is fit for finishing. 

Final Thought 

Building a basement is not too expensive and is essential as it adds living space to your house. As a homeowner, you should consider all that is in the article to make the basement project worthwhile.

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