Bump-out additions: How to get more room without the expense of a full addition
Do you wish your kitchen was a bit bigger so that it could fit a breakfast table? You may want a tub in your master bath, but none of the models you found will fit. You can add just a few feet to your home without the headache and expense of a complete room extension with a bulging addition. Also called a micro addition, if you think a bump out would solve your design needs this post will answer all your questions.
What is a bump-out addition?
Typically, a bump-out addition becomes cantilevered from the existing foundation, similar to a balcony, eliminating the need for foundation work. And a micro addition does not need to be fixed into the existing roofline. Both qualities save both time and money, while still adding extra space.
The most noticeable difference between a bump-out and a room extension is size. Bump outs are minor. Only a few meters small, which of course saves on material costs. Bump-out additions are limited in size because they do not have a separate foundation.
Also, micro-additives rarely need additional heating or cooling. The vents of the room to which the bump-out will be attached will provide adequate service for the extra square footage. Just don’t install plumbing pipes in the unheated area.
- Keep reading: Home addition costs – price per square meter, where to save and financing options
How big can you make a bump-out addition?
The weight of a cantilever bump-out is held by the house’s existing floor joists. The bigger the bars, the bigger your protrusion can be. According to Manny Angelo Varas, president and CEO of the MV Group, luxury home builders in South Florida, a floor joist can be four times as deep as the joist. For example, if your joists are 2x10s, they will be 9 ¼ inches deep. Multiply that measurement by 4 and your micro addition can be extended 37 inches.
Homeowners typically add bump-out additions to the first floor of the home. But you can also add one on the second floor. And if your home is built on a concrete slab, you can still add a bump. According to Varas, a slab can support a 3-5 foot cantilever.
Reasons to add a little extra to your home
Aside from cost savings, there are several reasons why homeowners choose a bump out over a full room extension. The most obvious reason is that they only need a few more feet in the house. But there are also other reasons outside the home.
According to Varas, you need a building permit for a micro addition. So, before considering a home remodel, check with your construction officials about permit requirements and zoning setbacks. If your home is already close to your property boundary, your setbacks may be too tight for a full house addition. That’s a great opportunity for a bump-out.
You might also want to consider a bump-out to protect mature trees and their roots. By freeing up the addition of the existing foundation, you can add space to your home without disturbing the ground. And tree roots aren’t the only thing underground. The foundation work requiring a full house addition may require relocation of substandard conduits or utility lines. The work to relocate those lines adds to the total cost of the remodel.
Finally, if your yard is too small to allow access and maneuvering of the heavy equipment needed for foundation work, adding a bump-out will still give you more square footage.
How much does a bump-out addition usually cost?
According to the online home services marketplace, Homeguidethe average room or home addition costs between $ 86 and $ 208 per square foot. At this rate, a typical addition to a home can cost $ 20,000 or more. But because a bump-out lacks some of the factors driving up costs, a 2-foot micro addition in the kitchen can cost as little as $ 5,000.
Two feet may not sound like a lot. But considering using it as long as a 15-foot room will give you an additional 30 square feet. That’s enough space to add a breakfast table, pantry or center island.
Why are bump-out additions cheaper than full additions?
Because construction costs are often calculated based on square footage, the smaller size of a bump-out makes them cheaper than a room extension. However, there are other factors that come into play. Lack of foundation is the most important. Other factors depend on the size and function of the additive, which may mean you don’t need:
- HVAC pipes
- Extension of the existing roof
- As many windows as a full room extension
Bump-out addition pros and cons
Before going into the pros and cons of a bump-out addition, Varas advises homeowners to ask themselves, “Do you want to live in the house and just enjoy it or create future value?”
Enjoying your home remodel every day takes the sting out of the high cost of a full addition. But if you only feel the squeeze of a small dining room when everyone is home for Thanksgiving, a bump and the smaller price tag might be the best option. Especially when you know that you will be home forever.
But if you see yourself selling in the future, Varas says bumpouts don’t add much value to the home or provide a significant return on investment. “A full-size addition creates future resale value that a bump-out won’t do,” he says.
Otherwise, the pros and cons of a bump out addition are:
- Lower cost
- Just enough space for what you need
- Lose less garden space
- Protect mature trees
- Fits seamlessly into the existing structure
- Adds space to just one room
- You may have trouble matching your siding
- Kitchens and bathrooms may require piping depending on your layout
- Not for the average do-it-yourselfer
Ideas for extensions
Varas says the most popular use for a micro addition is to expand the same space. Here are a few ways homeowners are using their bump-out additions to bring functionality and fun into the home.
- As a bay window with window seat in the living room or study.
- To expand the main bath, make room for both a bathtub and a shower.
- In the kitchen, to add dining space, space for an island or pantry, or larger appliances.
- To add a walk-in closet to a bedroom.
- To add a laundry room or mud room.
- Like a home office nook of the family room.
Finally, always consult a qualified professional before embarking on any home addition, especially a bump. If a cantilevered micro additive is not properly supported, it can sag, leading to structural damage to the home. It can also leak and cause mold and water damage. And to avoid further complications, always follow local zoning, building codes, and HOA regulations.