Crawl Space to Basement Conversions in the DMV

Turn Your Damp Crawl Space Into a Full-Height Basement

Stop wasting space under your home. We excavate, underpin, and convert shallow crawl spaces into functional, dry basements that add square footage and structural value. We can also deepen existing basements with low ceiling heights, creating more usable space while strengthening the foundation.

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Beyond Just "Digging Out"

Safely Expanding Your Home From the Ground Down

A conversion is a major structural lift for your house. We take the cramped, dark area under your floor joists and transform it into a full-height, livable basement. The process involves phased excavation, underpinning your existing foundation, and integrated drainage.
In older Alexandria or DC homes, crawl spaces are usually dirt-floored magnets for moisture and mold. Digging down creates space for a gym or suite and also reinforces an aging foundation while fixing humidity issues at the source.

IS YOUR HOME A CANDIDATE?

Why Homeowners Dig Down

Need More Room?

You get a full floor of new living space without losing an inch of your yard.

Dry Out the House

Converting to a basement usually kills the "old house smell" by replacing damp dirt with sealed concrete.

Fix the Foundation

Most conversions include underpinning, which actually makes your home's footprint more stable than the day it was built.

Property Value

A basement with 8-foot ceilings is a massive selling point in the DMV market.

How We Do It

Engineering-First Excavation & Support

Converting a crawl space or lowering a basement is high-stakes structural work. You can’t just start digging. We follow a strict, engineered sequence to keep your home level while we work underneath it. No guesswork.

Engineering & Permits

We start with soil tests and load calcs. We work with local building departments to get your plans approved.

Strategic Excavation

We remove soil in sections. This keeps the house’s weight supported while we create the new depth.

Underpinning

This is the core of the job. We extend your foundation walls downward, anchoring them into deeper, stronger soil.

Waterproofing

New basements need to stay dry. We install interior drainage, high-capacity sump pumps, and vapor barriers before the floor goes in.

The New Slab

We pour a reinforced concrete floor, giving you a clean, level surface ready for framing or storage.

Crawl Space Conversion FAQs

Common Questions About Digging Down H3: What You Need to Know Before the First Shovel Hits the Dirt

Q: Is it actually safe to dig under my house?

If it’s done right, yes. We use phased excavation and temporary structural shoring. Your house stays supported throughout the entire dig.

Q: How long is my house going to be a construction zone?

These aren’t overnight jobs. Expect several weeks or more depending on the size of the footprint and how deep we’re going.

Q: Will I actually see a return on investment?

In the DC metro area, square footage is everything. Adding a basement is often more cost-effective than a traditional “pop-top” or side addition.

Q: Do I really need a new drainage system?

Always. If you’re digging deeper, you’re closer to the water table. We build the waterproofing into the foundation so you never have to worry about floods.

Q: Can I finance a project this big?

Yes. Most homeowners do. We have flexible plans to break the cost into manageable monthly payments.

Can my existing basement be made taller?

Yes. Using the same excavation and underpinning process used for crawl space conversions, we can lower an existing basement floor to increase ceiling height and create more usable space (such as 4′ to 8′).

STILL HAVE QUESTIONS?

Converting a crawl space or lowering a basement is a big decision. If you’re unsure whether your foundation can handle it or if the math makes sense, our specialists can give you a straight answer on feasibility.

What Homeowners Are Saying

See Why DMV Is a Trusted Local Name

    
 
 
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   C 
 
 
 
  We had a great experience with DMV Foundation.  I had cracks in my foundation, and I called a number of companies. Each company suggested a different answer to the problem and estimates varied widely.  I ended up hiring an independent engineer to get an unbiased opinion.  The engineer's report tracked what DMV told me precisely.  Amazingly, this was also the least invasive and most affordable solution.  DMV earned my trust. They were honest, fair, showed up on time and did great work.  I highly recommend them.
  
 
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   Corinne Metz 
 
 
 
  Yos and his team really know what they are doing! They inspected our home and told us what we needed. The work that was done looks great and we have no more issues. The team is highly professional, considerate and was flexible with our schedule. They have gone out of their way to accommodate us. You can’t do better than this company!!! They are the best!
  
 
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   Kelly Shoop 
 
 
 
  I had a consultation with DMV at the strong recommendation of my neighbor and they did not disappoint.  Yos was thorough, responsive, and very patient with all of my questions, including follow up emails.  I particularly appreciated the transparency on cost.  Would highly recommend them to anyone in the market for waterproofing or foundation repair.
  
 
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   LaGaye MacDowall 
 
 
 
  Logan was so patient answering all our questions! Great customer service.
  
 
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   Alexsa MacDowall 
 
 
 
  Thankful for this company! Very professional and the office staff is very helpful! Definitely recommend.
  
 
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   Logan Landers 
 
 
 
  Russell was nothing short of awesome!  Great service,  great information. A++!!
  
 
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   Randy Harding 
 
 
 
  DMV Foundations is an absolute pleasure to work with! As a contractor who remodels homes, I’ve partnered with them on multiple projects, and they consistently excel at diagnosing foundation issues and water problems accurately and thoroughly. They always provide honest, cost-effective solutions and back them up with a skilled team that executes the work flawlessly. Communication throughout the entire process is top-notch. I highly recommend DMV Foundations and will continue using them for all my foundation needs!
  
 
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   Matt 
 
 
 
  Honestly, I am skeptical of home repair contractors generally. But DMV was absolutely 100% fantastic in every way.  Water was leaking into my basement and I met with 3 or 4 waterproofing companies.  It was clear to me that DMV was different because they were careful before giving their recommendation about how to fix it while the others had the same canned/off the shelf approach that they probably sell to everyone.  They came in and did their work as they promised and it fixed the problem.  I also contacted them in the middle of the night when I thought I had a gas leak and their response was immediate and excellent.  In a market full of pretenders, these guys are serious professionals.  I highly recommend them.
  
 
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   Simone 
 
 
 
  It would definitely hire DMV Foundation Solutions again if I need to.  They came out and quickly determined the problem and offered a solution.  They completed an exterior waterproofing project and it completely fixed the flooding I had in my basement.
  
 
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   John Murphy 
 
 
 
  This family owned business is incredible. Quick and responsive! thorough! helpful!  and reasonably priced!

WHY DMV STANDS OUT

TRUSTED.
LOCAL.
PROVEN.

FAMILY OWNED

AFFORDABLE & TRANSPARENT PRICING

LIFETIME TRANSFERABLE WARRANTIES

40 YEARS

FULLY LICENSED & INSURED

DEDICATED PROJECT MANAGEMENT

Finance Your Foundation Upgrade

Smart Ways to Pay for Major Structural Work

A basement conversion is an investment in your home’s future. To make it easier to start, we offer 0% interest options and low monthly payment plans. Don’t let a cramped crawl space limit your home’s potential.

Mon-Fri 9am to 5pm

4307 Wheeler Avenue, Suite 100

Crawl Space to Basement Conversions in the DMV

Turn Your Damp Crawl Space Into a Full-Height Basement

Get your free inspection

Beyond Just "Digging Out"