Basements & Home Expansion

Create More Living Space Beneath the Home You Already Love

Carroll Construction transforms crawl spaces and unfinished basements into practical living space designed around the structure, conditions, and long-term needs of your home.

Discuss Your Project View Basement Projects

Basements & Home Expansion

Create More Living Space Beneath the Home You Already Love

Discuss Your Project View Basement Projects

Basement Experience Built Around East Bay Homes

Creating Space Where There Was None Before

Many older East Bay homes have valuable space beneath them, but converting that space takes much more than simply finishing a basement.

The house may need to be supported while soil is removed, the foundation rebuilt or extended, drainage installed, and the new lower level framed into the existing structure. Carroll Construction has extensive experience coordinating this structural work so the finished space feels like a natural part of the home, not an afterthought.

Basement & Home Expansion Services

Basement Dig-Outs

Excavating beneath an existing home to create the height and space needed for a functional lower level.

Bed, Bath & Family Rooms

Building usable rooms that give a growing household more space without requiring a move.

Laundry & Utility Areas

Relocating mechanical equipment and laundry functions into a more organized, practical part of the home.

Crawl-Space Conversions

Turning shallow or underused areas beneath the house into storage, utility, or habitable space where conditions allow.

Daylight Basements

Creating lower-level living areas with exterior access, windows, and natural light whenever the property and design make it possible.

Basement Structural Work

Providing the foundation, framing, beams, retaining walls, and structural work required to support the house and the new space below it.

Building Down Involves More Than the Basement

A basement conversion may also require structural, drainage, and finish work to make the new space durable and properly integrated with the home.

Evaluate the condition of the existing foundation
Address groundwater and drainage conditions
Plan excavation and temporary structural support

Complete necessary foundation and retaining work
Coordinate framing, utilities, and finish work
Resolve moisture or structural issues before enclosing the space

The Right Space for Your Home

Not every basement needs to become a fully finished second living level. Depending on the property, budget, and goals, the right project may be a full dig-out, a smaller utility basement, additional storage, or a targeted expansion beneath part of the house.

We evaluate what is physically possible and explain what the work is likely to involve before recommending a scope. The goal is to create space that is useful, properly supported, and worth the investment for your household.

What Homeowners Say

       EXCELLENT  
   Based on 52 reviews 
    
 
 
 
   
 
 
      Posted on Yelp  
   
   Fey A. 
 49 days ago
 
 
 Verified Carroll Construction just finished a project for us, replacing the entire house siding. Everything went as planned without any problem. Tom Carroll oversaw the project: the job was completed efficiently, and the work was done properly at each stage. Communication was good throughout. For the additional repairs he made a time and  materials contract, which is very fair. I highly recommend this company.
  
 
     Posted on Yelp  
   
   Christopher P. 
 83 days ago
 
 
 Verified We had a great experience during the estimating process. Tom was responsive, arrived prepared, and demonstrated a solid understanding of the project and what it would take to complete it. Even though we decided to move forward with another contractor, he handled the news professionally and was gracious throughout. I appreciated his honesty, clear communication, and respectful approach, and I would gladly recommend him to others.
  
 
     Posted on Yelp  
   
   Claire F. 
 317 days ago
 
 
 Verified Recently carroll construction put in some porch stairs of me.
The job was meticulous and the company was a joy to do business with.
I would highly recommend this company.
  
 
     Posted on Yelp  
   
   Stephanie W. 
 436 days ago
 
 
 Verified I wasn't sure exactly what I needed to address the flooding in front of my basement door. Carroll Construction came recommended by a neighbor and the experience and work was fantastic. They responded to my email quickly, came out to assess the work and make a recommendation within a short time (and were on time which is great since i work during the day) and provided a clear, detailed quote that was totally fair. The work was scheduled easily and the end result is perfect...their clean up was thorough and I'd recommend them to anyone needing work.
  
 
     Posted on Yelp  
   
   JP L. 
 555 days ago
 
 
 Verified In short: Tom and his team are fantastic and turned our 2/1 into a 3/2 with a full basement in about 8 months. We wanted to add a bedroom, bathroom and basement to our house and had heard about Tom from other Alameda residents and family who had had some work done in the past. He is well known for basements and foundation work here in Alameda, but our project had it all- new bedrooms, decks, roofs and everything along with it.

Tom and his team was able to do it all turning our 2 bedroom, 1 bath into a 3 bedroom, 2 bath with a large daylight basement, all while we were still occupying the home with two young children! They finished very close to the estimated timeline with excellent workmanship. We were very impressed how quickly they performed the demo and framing, getting everything enclosed well before winter. Our new bedroom and bathroom have been a dream and our basement is an awesome.
  
 
     Posted on Yelp  
   
   Josh H. 
 557 days ago
 
 
 Verified We had an emergency situation at our business. Our storefront window was broken and Tom sent a crew down right away to secure our store. His team did an excellent job very quickly. I don't think this is a service that his company typically provides, but Tom saw a problem and they fixed it quickly. We're so thankful to Carroll Construction and would recommend Tom to anyone in need of a contractor. Thanks so much, Tom!
  
 
     Posted on Yelp  
   
   Anne P. 
 590 days ago
 
 
 Verified +0
I am so grateful for Carroll Construction! They replaced a rotten post on my front porch. The pricing was fair and transparent. Rather than providing a quote for the whole job, the owner priced the job based on time because there were so many unknowns. Thankfully, the job was not as involved as we originally thought, so paying based on time ultimately saved me money. The team was responsive and professional. I am very happy with the result! I highly recommend using Carroll Construction--especially if you're a homeowner with no idea what you're doing like me!
  
 
     Posted on Yelp  
   
   Mike G. 
 647 days ago
 
 
 Verified +1
Carroll Construction (CC) recently completed repair of our split-level balcony   damaged by dry-rot.  The work included repair of the single-door garage frame and house stucco. Tom was the only contractor who proposed a time & material agreement since there was no clear understanding of how badly the dry-rot had spread. Thankfully, the damage was relatively limited but resulted in a tremendous cost saving finishing well under over-scoped bids from competitors. Our budget absorbed additional work to replace the garage door opener and install a custom wrought-iron railing.  Superb quality of  work by the CC site crew and sub-contractors who completed deck waterproofing, stucco work and door opener replacement.  Tom's crew was timely, well-focused, neat, professional and friendly.  There's more work waiting for Carroll Construction on this 98 year old house!
  
 
     Posted on Yelp  
   
   Ten B. 
 821 days ago
 
 
 Verified We recently had Carroll Construction come in and do some foundation work for our home. Tom was great, he was very detailed in his inspection and assessment of the work needed. We had other local contractors we reached out to for bids, unfortunately they were over scoping the project work. Tom saved us a lot of money. His team did an excellent job and on schedule. They were courteous, respectful and cleaned up the site every day. 
We have already started talking about additional project for Tom and his team in the coming months. 
From our experience, we would highly recommend Carrol Construction
  
 
     Posted on Yelp  
   
   Cece B. 
 987 days ago
 
 
 Verified Tom did a fantastic job replacing our brick foundation with concrete. His crew were respectful, cleaned up at the end of each day, and they kept to promised  timelines. Communication with Tom was excellent. Whenever I had a question or concern, I got a prompt response within the day.. I have worked with scores of trades people over the years on various properties. My experience with Tom is one of the best I've had in many years.

Planning a Major Home Project?

Call and we’ll talk it through.
We’ll give you a realistic starting point and let you know what makes sense and what doesn’t.

(510) 523-1968