Basement Waterproofing in Annapolis, MD for Wet, Leaking and Damp Basements
We waterproof basements and crawl spaces in Annapolis. In a city where the median owner-occupied home is worth $548,900 (Census Bureau, 2020-2024), a basement that floods, leaks or smells damp is a problem worth fixing at the source. Call Annapolis MD Basement Waterproofing at 123-456-7890 for a free estimate.
Basement water gets in a few ways: water sitting against the wall, a crack or a joint that lets it in, or a high water table after heavy rain. The Maryland Geological Survey says the majority of wet basements are likely not caused by rising groundwater, but attributed to improper treatment of the house foundation, landscaping issues and improper grading. We find which cause is yours first, then waterproof the basement to match.
Our Basement Waterproofing Services in Annapolis
Basements get wet in different ways, so we choose the system by where the water enters and where it needs to go.
We install interior basement waterproofing
Interior drainage collects water that reaches the wall or the floor joint and carries it to a sump pump. We cut a channel along the floor edge, lay drainage, and finish the floor so the water has a path out. Interior basement waterproofing
We waterproof basement walls from the outside
Exterior waterproofing stops water before it reaches the wall. We dig down to the footing, clean and repair the foundation wall, apply a waterproof membrane and set drainage at the base. Exterior basement waterproofing
We waterproof crawl spaces
A crawl space that holds water or damp air affects the floor above it. We control the water entering the space and the moisture inside it. Crawl space waterproofing
We repair basement leaks and foundation cracks
Not every crack leaks, and not every leak is a crack. We trace the leak to its source, seal the cracks that let water in, and tell you which ones can be left alone. Basement leak and crack repair
We fix wet and flooded basements
A basement that takes on water after storms needs the water stopped, not just removed. We find where it enters and set up drainage to carry it away. Wet basement repair
We install sump pumps and drainage
A sump pump lifts the water that drainage collects and sends it away from the house. We set the pit, the pump and the discharge line. Sump pump installation
Work is performed by independent professionals. Every project starts with an inspection and a written price before any work begins.
Why Annapolis Basements Get Wet
Three things work together in Annapolis: the weather, the ground and the age of the houses.
The rain is steady all year. The NOAA climate normals for the Annapolis NAF, MD station (ID USW00013752, 1991-2020) put precipitation at 43.99 inches a year. Summer is the wettest season at 13.25 inches, and winter is the driest at 8.20 inches. The same station averages about 56 days a year with a low at or below 32°F. Rain, runoff and cold all reach the walls and the ground around a basement.
The ground varies lot to lot. A USDA Web Soil Survey run over central Annapolis maps about 40% of the area as Annapolis-Urban land complex, which is more than half of the land, since about 28% of the area is water. USDA describes the Annapolis series as well drained, with a seasonal high water table deeper than 72 inches and low shrink-swell. Urban land and filled ground change from one lot to the next, so we do not assume your ground matches the map. The Maryland Geological Survey adds that the water table is typically at its highest in the spring and early summer months, and that areas with a relatively shallow water table can pose problems with infiltration into basements.
Most Annapolis homes are old. Census Bureau figures (American Community Survey, 2020-2024) show that about 59% of occupied homes in Annapolis were built before 1980, and about 14% were built in 1939 or earlier. About 41% are detached houses and about 25% are attached houses such as townhouses. Older walls, older drainage and older gutters have had many more storms to deal with, and the water that gets past them shows up in the basement.
Signs You Need Basement Waterproofing
Basement water often shows up as a sign before it shows up as a puddle. Look for:
- Water on the floor after rain, or a floor that stays damp
- White, chalky deposits on the walls (efflorescence)
- A musty smell that returns after cleaning
- Peeling paint or bubbling on the lower walls
- Cracks in the wall or a gap where the wall meets the floor
- Water lines or rust at the base of the walls, the water heater or the furnace
One damp spot after a storm can come from a clogged gutter. Several signs together, or water that returns every time it rains, mean the water is finding a way in and an inspection is due.
Why Homeowners Choose Us
- A system chosen for the cause. We match the waterproofing to how the water gets in.
- We check the outside first. Gutters, downspouts and grading are looked at on every inspection, because the Maryland Geological Survey names the house foundation, landscaping and grading among the causes of a wet basement.
- We explain the choice. You hear why we recommend interior, exterior or both, and what each does.
- A free, no-obligation estimate. Every job starts with an inspection and a written price.
- Prices set before work. The written price is the price, with nothing added after.
How We Work
First, we inspect the basement, the walls, the floor joint and the outside of the house, marking where water enters and where it collects. Second, we check the gutters, the downspouts and the grading, because water that runs toward the house ends up against the wall. Third, we write up the system and the price. Finally, our installers do the work and we walk the finished job with you. Permit rules in Annapolis are set by the City. Its permit page lists constructing, altering or repairing a building and installing or altering a plumbing system among the work that needs a permit, and exterior projects in the Historic District still need a certificate of approval. What applies depends on the work and the address, so we confirm it before work starts.
Already Have a Quote?
If another company has given you a price, call 123-456-7890. We'll inspect the same basement and put our plan in writing, so you can compare the two side by side and see whether the system and the price fit the problem.
What a Good Waterproofing Quote Includes
Two prices mean something only when they describe the same work, so compare quotes on these points:
- The cause. It says where the water is coming from and why, not just what will be installed.
- The scope. It states how many feet of drainage or wall, and how many pumps, and where they go.
- The system. It names interior drainage, exterior waterproofing or both, and why.
- The discharge. It says where the pumped water goes after it leaves the house.
- The warranty. It lists in writing what is covered, for how long and what voids it.
- The contractor's license. The Maryland Home Improvement Commission says only MHIC-licensed contractors may enter into contracts with homeowners to perform home improvement work. Check a contractor's license status on the Commission's website or call 410-230-6231.
Our written plan covers each of these before work begins.
What Basement Waterproofing Costs in Annapolis
Basement waterproofing spans a wide range because the work does. A 2026 HomeGuide national guide (written January 23, 2026) puts the overall average at $6,000 to $18,000. It lists interior waterproofing at $6,000 to $12,000, exterior waterproofing at $10,000 to $18,000, sump pump installation at $600 to $2,500 or more, and epoxy crack repair at $250 to $800 or more per crack.
Those are national averages, not Annapolis quotes. How much wall or floor edge needs work, how deep the water is entering, access to the walls and whether a sump pump and discharge line are part of the job all move the price. A real price for a specific house comes from an on-site inspection. What basement waterproofing costs and what changes the price
Areas We Serve Around Annapolis
We waterproof basements in Annapolis and the nearby Anne Arundel County communities. See the full service area
Frequently Asked Questions
Why is my Annapolis basement wet?
Often the cause is at the foundation or outside it. The Maryland Geological Survey puts most wet basements down to the foundation, landscaping and grading, not to rising groundwater. Clogged gutters, downspouts that empty at the wall, and ground that slopes toward the house send water against the foundation. A high water table after heavy rain, cracks and failed wall joints are the other common causes. We inspect inside and out and tell you which one you have. Why is my basement wet
How much does basement waterproofing cost in Annapolis?
A 2026 national guide from HomeGuide puts the overall average at $6,000 to $18,000, with interior waterproofing at $6,000 to $12,000 and exterior at $10,000 to $18,000. Those are national averages, not Annapolis quotes. The length of wall, how the water enters and whether a sump pump is needed set the price for a specific home, and an on-site inspection gives the real number.
Should I choose interior or exterior waterproofing?
It depends on where the water enters. Interior drainage collects water that reaches the wall or the floor joint and pumps it out. Exterior waterproofing keeps water from reaching the wall at all, and it means digging down to the footing. We look at the wall, the floor joint, the grading and how much of the house is accessible, then recommend one or both. Interior vs exterior waterproofing
Do I need a sump pump?
Not always. A sump pump is useful when drainage collects water that needs to be lifted out of the basement, or when the water table rises after heavy rain. If the water is coming from a downspout that empties at the wall, fixing that may be enough. We check the cause before we recommend a pump. Sump pump installation
Are cracks in my basement wall serious?
Not always. Hairline cracks are common in concrete, and many are not letting water in. A crack that leaks, grows, or sits next to a bowed wall is a different case. We look at the crack and the water and tell you which one you have. Basement leak and crack repair
Do I need a permit for basement waterproofing in Annapolis?
It depends on the work and the address. The City of Annapolis permit page lists altering or repairing a building and installing or altering a plumbing system among the work that needs a permit (City Code 17.12.022), and exterior projects in the Historic District still need a certificate of approval (Chapter 21.56). We confirm what applies to your house before work starts.
Get a Free Estimate in Annapolis
For basement waterproofing in Annapolis, call Annapolis MD Basement Waterproofing at 123-456-7890 for a free estimate. You can also reach us here.