We Make It Easy To Find A Great Room Addition Contractor

  • We match you with contractors that fit your project and budget
  • All our pros are experienced, reliable and reasonably priced
  • Get ongoing support from a dedicated Remodeling Advisor

All at no cost!

Room Addition Contractor Los Angeles, CA
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The perfect contractor in 3 easy steps

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Call and tell us about your project.

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We match you with three reliable general contractors.

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Get free estimates and choose your favorite.

Finding a Good Room Addition Contractor can be Frustrating

It doesn’t have to be

We personally match you with honest pre-screened pros and provide project support from start to finish, ensuring you’ll find a great contractor and enjoy a stress-free remodel.

What is GreatBuildz? We Make It Easy To Find a Great Contractor
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GreatBuildz makes
room additions easier from start to finish

Simple & Convenient:

We connect you with 3 room addition contractors who fit your budget, all with one call.

Better Contractors:

Our contractors pass a rigorous screening process and sign our Code of Conduct.

Ongoing Project Support:

We support you throughout your home addition project because you shouldn’t have to go it alone.

Real Customer Service:
Our friendly staff is always available, ensuring you get help and guidance from a real human.
Call or text us at 818-317-3567.

Whatever you envision for your home, finding the right contractor is everything.

More than half of homeowners end up frustrated and unsatisfied with their home remodeling contractor or with how their project turns out. Our mission at GreatBuildz is to help you avoid this situation.

Our experienced team will match you with an outstanding general contractor and support and guide you throughout your project.

Common Room Additions

  • Bedroom addition
  • Bathroom addition
  • Kitchen addition
  • Living room addition
  • Family room addition
  • Great room addition
  • Dining room addition
  • Gym addition
  • Sunroom addition
  • Garage addition
  • Fonzie apartment addition
  • Second-story addition
Build an ADU in Los Angeles

Room Additions vs. Accessory Dwelling Units (ADUs)

Room additions and accessory dwelling units are often confused, but they’re not the same.

A room addition is a build-out of an existing structure to increase its square footage and functionality. Adding another bathroom or bedroom, enlarging an existing living area, or adding a second floor are all examples of room additions.

An accessory dwelling unit is a standalone structure designed to function as a small home. An ADU typically has its own kitchen, bathroom, bedroom/sleeping area, and living space. It can be used as a guest house, rental unit, home office, art or music studio—or even a “man cave” or “she shed.”

Room Addition Tips for Homeowners

Hiring a reputable, experienced contractor is key to ensuring your room addition project goes smoothly. But doing a little prep work can help you avoid some common pitfalls. Here are some tips:



Determine your budget. Research what similar projects cost in your area. This will help you set a realistic budget and determine whether contractor estimates are reasonable.


Decide what features you want. Make a list of all the must-haves for your addition, whether you’re adding a second floor or expanding the size of your kitchen. Give the list to any contractor you’re considering so every estimate is based on the same factors.


Research what’s involved. Take some time to familiarize yourself with local laws and codes. This will help you determine whether your dream addition is allowed where you live. It will also help you know how the construction process should unfold. It always helps to be informed.


Get three estimates. Reach out to at least three general contractors for estimates. This will help you identify overpriced contractors—but also companies that underprice their services because they cut corners.


Never pay more than a small deposit. If your contractor pressures you into paying a large deposit, this is a red flag. In California, contractors can’t legally ask for more than a $1,000 deposit. If a contractor asks for more, they are violating the law.


Don’t be afraid to walk away. If a prospective contractor uses aggressive sales tactics, refuses to answer questions, or fails to return your calls within a reasonable time frame, these are red flags. If you’re feeling uneasy about a contractor, go with your gut and move on. Then call GreatBuildz to be connected with a reputable contractor.

Home Remodeling Guides


Room Additions

People Love GreatBuildz Contractors

GreatBuildz five star review

"As first-time renovators, GreatBuildz made the process easy and stress-free. Their expert guidance was invaluable. Highly recommend!"

-Aaron & Jessica, West LA

GreatBuildz five star review

"With our busy schedules, having a trusted advisor was tremendously helpful. We had a great experience with wonderful results!"

-Steven, Malibu

four half star review

"There are so many unreliable contractors. GreatBuildz intro'd me to contractors that kept their appointments, gave a reasonable price, and did great work."

-Albert & Kristin, Pasadena

 GreatBuildz Contractor services include:

Renovations & upgrades
Repairs & updates
Living Rooms
Pools and Outdoor Living
Gut remodel
Single Family homes
New Construction
2nd story
ADU and JADU (accessory dwelling unit)

Why Use GreatBuildz for Your Room Addition Project?

Our free service removes the stress of finding a great contractor. We connect you with reputable, vetted professionals in three simple steps:

  1. Call us and tell us about your project.
  2. We match you with three reliable general contractors.
  3. Review the free estimates and choose your favorite.

Every contractor we work with is licensed and insured and has passed a 10-point vetting process. We check each contractor’s background, references, work experience, and more, and we require that contractors commit to our code of conduct.

Our service doesn’t end when you choose a contractor. We provide support and guidance throughout your project, from start to finish.

Ready to Start Your Room Addition Project in Los Angeles?

Contact GreatBuildz Today

The team at GreatBuildz is ready to help you find the best contractor for your project. We’ve built our reputation on providing exceptional customer service and connecting homeowners with top-rated professionals. Call us to connect with a room addition contractor in Los Angeles, Ventura, or Orange counties.

Room Addition FAQs

How much does it cost to build a 10x10 or 10x12 room?

A basic bedroom addition of this size will cost $30,000-$60,000 in Los Angeles or Southern California.

Is it cheaper to build up or out?

In terms of an existing home, its cheaper to build a one-story addition. Building ‘up’ by doing a second story addition is extra costly because of the need to reinforce the structure of the first floor to support the addition above.

What do I need to know before building an addition?

In order to consider an addition to your home, you’ll need to understand if you have the space on your lot and determine if you have the budget for this kind of project. For more info regarding the costs involved in building different kinds of room additions, check out https://www.greatbuildz.com/blog/home-addition-second-story-addition/

How do I plan a room addition?

In order to plan a room addition, you’ll want to start by determining the scope and budget of the home addition you desire by doing some research online. Next, you’ll want to meet with an architect, designer or contractor to find get a more detailed understanding of the time, process and costs involved in a room addition project for your specific situation. 

Is it worth putting an addition on my house?

Yes. If you are willing to allocate the time and money to a major addition project, it will certainly add value to your home in two ways.  Your enjoyment of your home will increase because of the added space. Additionally, the resale value of your home will increase because future buyers will be willing to spend more due to the added square footage and utility of the added space.

How much does it cost to add 300 square feet to a house?

It will cost approximately $100,000 to add 300sf of space to a home in Los Angeles or Southern California.  The cost might be lower if it’s a simple space like a bedroom or den, and would be more expensive ifs a bathroom or second story addition.

What adds most value to a house?

In terms of adding an addition, the most value is derived from adding a bedroom, bathroom or expanding a small kitchen.

How much does it cost to add a bedroom to a house in Los Angeles?

A simple, small bedroom should cost you approximately $30,000-$60,000 to build in Los Angeles and Southern California.  A Master bedroom suite will range in price from $120,000-$200,000. 

How long does a room addition take to build?

Once you’ve completed your home addition plans and received a city permit, you can expect the construction of an addition to take 2-6 months, depending on the size and complexity of the project. A second story addition is more complicated and will therefore take longer to build.

What are the steps to adding an addition to your home?

The first step to doing a home addition is to start with a general plan and discuss the viability of your idea with an architect, designer or contractor who comes to your home. They will give you feedback about the possibility and costs of your desired room addition. For a full guide of the steps involved in a room addition, read this article: https://www.greatbuildz.com/blog/home-addition-second-story-addition/

Does a second story addition cost more?

A second-story addition will cost at least $100/sf more than a conventional single-story addition, ranging between $300 and $500 per square foot on average. A second-story addition will always be more expensive due to the additional labor necessary to sustain the added weight. This may involve strengthening the home’s foundation, providing structural support to the walls and structure of the first floor, installing beams, etc.

Am I allowed to do a home addition?

First, you can visit the city’s building department and request assistance with zoning and standards. Alternately, you might call a local architect or designer and request that they visit your home to assess the viability of constructing a home addition. A reputable local contractor may also assist at this early stage and provide you with financial estimates based on their recent work.

What items will affect the cost of a home addition?

If your electrical panel is at capacity, you may need to update it to accommodate more circuits in your addition area.  Also, if your existing home is on a slab foundation (as opposed to a raised foundation), it will be more difficult to connect the plumbing (waste lines) and the associated expenses may increase. Lastly, if your roofing material is older or distinctive, it may be difficult to match it while constructing the addition, potentially necessitating a complete roof replacement. These are crucial points to address with your architect and general contractor.

What is the cost to get plans for a home addition?

An architect’s basic price of the plans should be about $8,000 to $15,000 for a basic project. I should include the process of plan submission/approval by the city, the numerous city fees, and other factors involved in the creation of a functioning floor plan. The contractor is the best person to discuss with you about the real cost of the project, the duration of the work, and any other construction-related factors you must be aware of.