A rare opportunity to own The Gaddy House, a thoughtfully designed Clarksville residence recognized for its forward-thinking sustainable design and exceptional energy performance. Built as a high-performance custom home, this property was intentionally engineered to achieve net-zero living, combining advanced building science with comfort, durability, and modern livability. Designed to meet LEED Platinum and Passive House standards, the home offers outstanding energy efficiency, superior indoor air quality, and year-round comfort. A carefully constructed building envelope, high-performance windows, and precision mechanical systems work together to reduce energy consumption while creating a quiet living environment filled with natural light. The home has been featured in multiple articles and case studies for its innovative approach to sustainable residential design. The layout balances open, functional spaces with a strong connection to the surrounding landscape, reinforcing the home’s focus on intentional living. Set along Old Hopkins Road in sought-after Clarksville, this property delivers a unique blend of innovation, environmental responsibility, and everyday comfort—ideal for buyers seeking a home that stands apart for both its design and performance. Wheelchair accessible through the garage.
Single-familyProperty Type
2014Year Built
1.22 acresLot Size
$394Est. Price/Sq.Ft.
2 garage spacesParking
Listed by Gary Ahrens• Keller Williams Realty Centre
Discover this award-winning, energy-efficient home featuring a unique custom design and solar power that fully sustains its energy needs. Enjoy the convenience of one-level living with an open-concept kitchen, living, and dining area. The property...
includes a spacious two-car garage equipped with EV charging and a wrap-around driveway for easy access.
8 months ago• May not reflect the current state of the home
An incredible hidden gem within 10 minutes of all major highways and even less of a commute to Maple Lawn! This home has it all including solar panels, waterless urinals and a spacious garage with generous amounts of natural sunlight! This gemstone...
sits on over an acre lot and comes adorned with a semi circular front driveway that makes parking a breeze! This home will not last!
8 months ago• May not reflect the current state of the home
Set on a peaceful, scenic lot this charming home boasts a relaxing side porch & deck; lush trees; circular driveway & detached garage; hardwood flooring; living room with fireplace; dining room with ceiling fan; large kitchen w/ breakfast room; main level master bedroom. Close to main roads, fabulous shopping & great restaurants!
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Public record
Public record
Zoning
Beds
—
Baths
2
Stories
1
Lot width
—
Lot depth
—
Lot size
1.22 Acres
Year renovated
—
Sq. Ft.
2,176
Year built
2016
Style
Single Family Residential
County
Howard County
APN
05 365376
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Sep 4, 2026.
RR-DEO
Rural Residential-Density Exchange Option Overlay District
The Rural Residential District is established to allow low density residential development within a rural environment. The Rural Residential District is intended for an area of the County which is already largely committed to low density residential subdivisions. Within the RR District, agriculture is permitted as well as residential development in both cluster and non-cluster forms. Cluster development is permitted in order to protect environmental and landscape resources and to preserve agricultural land.; The DEO Overlay District is established to provide land owners in the RC and RR Districts with opportunity and incentive to preserve significant blocks of farmland in the rural area of the county. This district is also intended to encourage the clustering of residential development in areas where the development will not have an adverse impact on farm operations. To accomplish this, the DEO District allows residential density in the RC and RR Districts to be exchanged between parcels. Density exchanges in the District should result in large parcels being preserved in perpetuity, while residential development is directed toward parcels which are able to absorb the additional dwellings.
Permitted uses
Include but are not limited to:
Agriculture
Housing-Single unit
Public service
Educational/school
Fire house
Recreation
Communications tower
Park & open space
Property details
Parking
Parking Information
Garage Sq. Ft.: 699
# of Detached Garage Spaces: 2
Garage Features: Additional Storage Area, Garage Door Opener
# of Total Garage and Parking Spaces: 6
Has Garage
# of Garage Spaces: 2
Driveway - # of Spaces: 4
Concrete Driveway, Circular Driveway, Electric Vehicle Charging Station(s)
Energy Efficient: Appliances, Construction, Home Energy Management, HVAC, Lighting
Energy Generation: PV Solar Array(s) Owned
Indoor Air Quality: Ventilation
Sustainability: Conserving Materials/Methods
Water Conservation: Efficient Hot Water Distribution, Green Infrastructure, Low-Flow Fixtures, Water-Smart Landscaping
Remarks: Heat recovery ventilator to exhaust cooking gases while supplying make up air. Energy recovery ventilator to freshen air, A ground loop to condition outside air feed to the ERV. All LEED lighting. Air tight design. A 6kW PV array to offset electricity from grid. Reflective driveway and roof to reduce heat island effect. The most efficient refrigerator produced (SunFrost) A non -venting Whirlpool Heat Pump Clothes Dryer. Induction cooktop. Waterless urinals. 0,8 gallon per flush toilets.
Lot Information
Tidal Water: No
Land Information
Land Assessed Value: $278,400
Above Grade Information
Finished Sq.Ft.: 2,176
Finished Sq.Ft. Source: Assessor
Below Grade Information
Unfinished Sq.Ft. Source: Assessor
Finished Sq.Ft. Source: Assessor
Financial
Tax Information
County Tax: $6,337
Tax Assessed Value: $634,700
Tax Year: 2025
Tax Annual Amount: $8,108
Assessments Information
Year Assessed: 2025
Lease Information
Lease Considered: No
Utilities
Utilities Information
Central Air
Cooling Type: Central A/C, Ceiling Fan(s), Ductless/Mini-Split
Cooling Fuel: Electric
200+ Amp Service
Heat Pump(s)
Heating Fuel: Electric
Hot Water: Electric
Sewer Septic: Septic Exists
Water Source: Cistern, Public
Location
School Information
Middle Or Junior School: LIME KILN
School District Name: HOWARD COUNTY PUBLIC SCHOOLS
Middle School Source: 3rd Party
School District Source: 3rd Party
Location Information
Outside City Limits
Directions: 32 to Sanner Road. R at Old Hopkins Road.
Location Type: Suburban
Road Responsibility: City/County
Road Surface Type: Black Top
Public facts
Beds: —
Baths: 2.0
Sq. Ft.: 2,176
Stories: 1.0
Lot Size: 1.22 acres
Style: Single Family Residential
Year Built: 2016
Year Renovated: —
County: Howard County
APN: 05 365376
Home facts updated by county records on Sep 4, 2026
Around this home
Schools
Pointers Run Elementary School
Public PreK-5 • Assigned • 2.1mi
10/10
Lime Kiln Middle School
Public 6-8 • Assigned • 1.0mi
10/10
Reservoir High School
Public 9-12 • Assigned • 1.2mi
8/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
3/10 Fire Factor
0.31% chance of being in a wildfire in next 30 years
6/10 Heat Factor
7 days above 104° expected this year, 15 days in 30 years
4/10 Wind Factor
18% chance of strong winds in next 30 years
3/10 Air Factor
3 unhealthy days expected this year, 4 days in 30 years
Provided by First Street
Historical weather
Clarksville, MD • 21029
Average low and high temperatures (°F)
37
22
42
27
60
39
69
47
72
54
83
64
87
70
80
62
77
59
68
46
57
39
43
28
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 9.2 hours in
June and 4.3 hours in December, placing it below the
U.S. average for solar exposure.
9.2 hrs
4.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$814,000 – $986,000
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