How Much Does It Cost To Build A Bump Out Addition From Scratch?

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If you’re considering expanding your home but don’t want to go through the hassle and expense of a full-scale addition, a bump out addition might be the perfect solution. A bump out addition is a small extension that adds extra square footage to your home, typically in a specific area such as a kitchen, bathroom, or bedroom. But how much does it cost to build a bump out addition from scratch? Let’s find out.

Factors Affecting Cost

The cost of building a bump out addition can vary depending on several factors:

  • The size of the bump out: The larger the bump out, the more materials and labor will be required, increasing the cost.
  • The complexity of the design: If your bump out addition requires intricate architectural details or unique features, it may drive up the cost.
  • The location of the bump out: Building codes, permits, and restrictions can vary depending on where you live, which may impact the cost.
  • The materials used: The type and quality of materials chosen for the bump out addition will affect the overall cost.

Average Cost

On average, you can expect to pay between $15,000 and $40,000 for a bump out addition. This estimate includes both materials and labor. However, keep in mind that this is just a rough estimate, and the actual cost may be higher or lower depending on the factors mentioned above.

Cost Breakdown

Let’s break down the cost of a bump out addition further:

  • Design and planning: This can account for around 10% of the total cost.
  • Materials: Depending on the quality and type of materials chosen, they can make up 30-40% of the total cost.
  • Labor: The remaining 50-60% of the cost will go towards labor, including construction, electrical work, plumbing, and finishing.

Additional Costs

In addition to the main cost of building a bump out addition, there are some additional costs to consider:

  • Permits: Depending on your location, you may need to obtain permits for the construction, which can add to the overall cost.
  • Architectural services: If your bump out addition requires complex architectural designs, you may need to hire an architect, which will increase the cost.
  • Upgrades and finishes: If you want to add special features or high-end finishes to your bump out addition, it will incur additional costs.


Building a bump out addition can be a cost-effective way to add extra space to your home without the expense of a full-scale addition. While the cost can vary depending on several factors, the average price range for a bump out addition is between $15,000 and $40,000. Remember to consider additional costs such as permits, architectural services, and upgrades when planning your budget. Consulting with a professional contractor can help you get a more accurate estimate based on your specific needs and requirements.


Q: Can I build a bump out addition myself to save money?

A: While it’s possible to tackle some home improvement projects on your own, building a bump out addition is a complex task that requires expertise in construction, electrical work, and plumbing. It’s best to hire a professional contractor to ensure the project is done safely and up to code.

Q: Will a bump out addition increase the value of my home?

A: Yes, a bump out addition can increase the value of your home. By adding extra square footage and improving the functionality of your living space, you can attract potential buyers and potentially increase the resale value of your property.

Q: How long does it take to build a bump out addition?

A: The duration of a bump out addition project can vary depending on its size and complexity. On average, it can take anywhere from a few weeks to a couple of months to complete.