Photo: Laura James

How much do bump outs cost?

On average, it costs between $85 and $210 per square foot to bump out a room. But this depends on the length and depth of the addition. Bumping out a room adds extra square footage and value to your home for less than a standard home addition.

homeadvisor.com - How Much Does It Cost to Bump Out a Room? - HomeAdvisor

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Factors That Influence the Cost to Bump Out a Room

Size is the main factor that influences the cost to bump out; most pros price per square foot. The cost of bump outs compared to the cost of full home additions is less because you don't need to worry about extra insulation, plumbing, electrics, lighting, foundation, or supports. But there are other costs that add to your total budget for a bump out.

Finishing the Space

Once the bump-out construction has finished, you've got to finish the space before you can outfit and furnish it. This adds to the total project cost.

Flooring

In most cases, installing new flooring costs $3 to $22 per square foot. However, there are loads of flooring options, and you'll want the flooring to match the existing space. But this could also be a good time to install new flooring in the whole room. For bump outs that are their own space, like a home office, laundry room, or craft space, you have more flexibility with flooring choices. On a tight budget, laminate flooring is a good choice. For warmth, carpet or hardwood is the better option. In bathrooms, go for tile flooring.

Decorating

As well as flooring the bump out, you'll also need to decorate the bare walls. Just like with the flooring, if the bump out needs to match the larger room, you have limited options unless you plan to update the entire room’s look, which could save you money in the long run. For example, when the bump out is ready for finishing, it's a good opportunity to redecorate as part of the cost to remodel a living room, rather than trying to match the bump out to the existing decor, then remodeling the whole thing in a few years.

Here are some common decorating additions and their associated costs.

Windows

Installing windows costs $3,500 to $9,900, depending on the size and number of windows. Most people pay toward the lower end of this range for bump outs. If your bump out adds to a bay or bow window and seating area, expect to pay between $800 and $15,000, all-in, for the cost to install a new bow or bay window, including the window panes and the bump out.

Electrical

While not always necessary, hiring an electrician costs $50 to $100 per hour. You'll need to hire a local electrician if the bump out requires additional lighting, outlets, or a ceiling fan.

Outfitting the Space

Depending on which room you bump out and what you plan to do with the extra space, you'll need to budget for the materials and installation required to appropriately outfit the space.

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How far can you bump out without foundation?

If your house's finished floor is above the grade of the landscape outside, your contractor can build a bump out of up to about 3 feet deep, and as long as 10 to 12 feet.

hgtv.com - Addition Planning: Bumping Out - HGTV

Because you'll need no foundation work, you can save about 15 percent compared with a conventional addition, says Schultz. And you may be able to save another 10 to 15 percent by tucking it under existing roofing. "In many parts of the country, it's common to have roof overhangs of two or three feet, so you might be able to tuck the bump out under that," he says. "Now all you're building is the wallno foundation and no roof." In other cases, you can just extend the existing roof over the bump out, which is far less costly than designing and building a new, separate roof.

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