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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   Jonathan Voorhies 
 
 
 
  Richard, Nicholas and William were awesome! Very professional and friendly!! Communication was excellent! Highly recommend!
  
 
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   Jason Schmid 
 
 
 
  I cannot say enough great things about Richard, Nicholas and William - the amazing father and son team that came out today to do some waterproofing work in our basement today. They went above and beyond replacing our sump pump. They rearranged piping to make the space way more functional and usuble compared to the original piping. They were so friendly, answered all my questions and left the space cleaner than they found it. 10/10.
  
 
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   Dan Higgins 
 
 
 
  We had water coming into the basement after recent rains and DMV diagnosed the problem and fixed it for a fair and reasonable price.  Very happy with the work they did and the price we paid.  Definitely recommend!
  
 
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   Pat Ragland 
 
 
 
  The service was good the price was right
  
 
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   Nina Voltaggio 
 
 
 
  DMV Solutions really helped us out by encapsulating our crawl space beneath our sunroom.  The workers were on time and cleaned up very well after the work was done.  We are very pleased with the job.
  
 
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   Curtis and Lara Smith 
 
 
 
  After struggling with a poor work done on our crawl space by a national company and no help to remedy even though we supposedly have a life warranty.  We made it a priority to work with a local business.  DMV was wonderful to work with, did't pressure us, explained their recommendation and answered questions in a super timely manner.  Their quote was reasonable and best of all they didn't try to upsell us.
  
 
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   Nicholas Sykes 
 
 
 
  I am a huge fan of DMV Foundation Solutions.

We recently moved into a new home with a list of items that needed attention. Then, after a heavy rain, we discovered another issue: water was flowing into a basement storage area.

I called four or five foundation companies looking for consultations and quotes, and DMV Foundation Solutions immediately stood out. They were easy to schedule, responded quickly, and were extremely thorough in evaluating our home. They looked carefully at both the inside and outside of the property, reviewed the full report from our home inspector, and helped us think through how to prioritize the different repairs. The entire process felt collaborative and solutions-oriented.

Their pricing was also the best we received, and they offered very supportive financing options. At that point, we were already excited to work with them.

Then we met Richard, Nicholas, and William—the crew that completed the work—and they took the experience to another level.

We were incredibly impressed by the quality of their work, their communication, and just how enjoyable they were to work with. This is easily the best team we have worked with on any repair or improvement to our home. They know what they are doing, take pride in their work, and consistently prioritize service, support, and finding the right solution. And they are fun and radiate the most positive orientation. I feel fortunate to have worked with this team and would explicitly request them by name in the future.

We would happily work with DMV Foundation Solutions again, and I have absolutely no hesitation recommending them.

If you have foundation, basement, crawl space, waterproofing, or related repair needs, I strongly recommend giving this team a call and having the conversation. From the initial evaluation through the completed work, they showed up at every phase of our engagement.
  
 
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   Travis “Trap Obama” Massenburg 
 
 
 
  Man... the job was projected 2+ days. They finished in one. I was also credited on a first job  towards an overall improvement.  They showed up on time, neat, and left the premises as clean as when they came. Big thanks to Richard, William and Nicholas for the hard work from DMV foundations.
  
 
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   Brandon West 
 
 
 
  We’ve had nothing but great experiences with DMV through a few projects. Timely and professional work. Highly recommend.
  
 
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   Ashley Schelske 
 
 
 
  Mauricio and Miguel and team did a fantastic job replacing our townhome’s walkway.  Work was completed on time and it looks great!

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"