Open House 11/15 1pm - 3pm
21 Clarkson Lane
Killingworth, CT, 06419 $ 1,995,000
Bedrooms5 Baths4.2 Sq 4,190 Monthly Estimate*
$ 13,779
for $1,995,000 with 5 bedrooms and 4 full baths, 2 half baths. This 4,190 square foot home was built in 2006 on a lot size of 2.4.
**WELCOME TO 21 CLARKSON LANE** Set at the end of a coveted cul-de-sac, 21 Clarkson Lane is a rare Connecticut country estate offering refined living, resort-style amenities, **Extraordinary Energy Efficiency**, and remarkable future possibilities. The main residence occupies 2.4 private acres, with an adjacent 1.9-acre buildable lot available for separate purchase. Whether envisioned for a future residence, guest house, equestrian pursuits, tennis court, or simply treasured open space, this offering provides exceptional flexibility. **A CONNECTICUT COUNTRY SETTING** Stone walls, pastoral views, mature landscaping, and exceptional privacy create an idyllic retreat. A spectacular pool, new bluestone patio, and beautifully appointed outdoor kitchen provide a private resort-like setting for entertaining. The impressive multi-purpose barn offers endless possibilities as a studio, pool house, game room, workshop, or recreational space. **THE CUSTOM RESIDENCE** Pristine, sophisticated, and exceptionally maintained, this custom residence offers five bedrooms, exquisite inlaid wood floors, abundant natural light, and generously proportioned rooms. The chef's kitchen features premium Wolf and Sub-Zero appliances and opens to inviting living spaces. The main level includes a private office, sunroom, elegant dining room, mudroom, and laundry. This versatile space offers potential for an in-law, au pair, guest, or private suite. The finished third floor provides two additional rooms and a full bath, while the finished lower level offers a fully equipped gym, additional food preparation area, and abundant storage. ***EXCEPTIONAL ENERGY EFFICIENCY | NEARLY OFF THE GRID** Luxury living meets remarkable energy independence! This oil-free home features state-of-the-art geothermal heating and cooling, paired with an extensive solar energy system, delivering exceptional year-round comfort while dramatically reducing reliance on traditional utilities. A buried propane tank serves only the whole-house generator and gas stove. Actual utility bills substantiate impressively low energy costs for an estate of this scale. Enjoy the luxury of expansive country living with the benefits of nearly off-the-grid efficiency. Sorry, Eversource! An extraordinary combination of country elegance, modern innovation, and exceptional lifestyle amenities.
See more
Open House
11/15/2026 1:00 PM - 3:00 PM
21 Clarkson Lane Killingworth, CT
* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm
FeaturesGeneralZoning R-02
Neighborhood N/A
County Middlesex
Tax Year July 2026-June 2027
Property Type Single Family For Sale
Status Active
Acres 2.4
Directions Beautiful drive off Rte. 9 or I-95
High School Haddam-Killingworth
City Killingworth
Elementary School Killingworth
Sq Ft Total 4190
DOM 89
Year Built 2006
Style Colonial
Year Built Source Public Records
Pool Description In Ground Pool
Energy Features Energy Star Rated Active Solar Generator Geothermal Heat Programmable Thermostat
See more
InteriorCooling System Ceiling Fans Central Air Zoned
Total Rooms 13
Basement Description Full Fully Finished
See more
ExteriorWater Source Private Water System
Lot Description Secluded Borders Open Space Dry Level Lot Professionally Landscaped Open Lot
See more
* Excluded FeaturesList ByTracee AdamsListing Agent
William Raveis Real EstateBroker
tracee.adams@raveis.comEmail
Affordability Calculator
- Monthly Principal & Interest
- $13,779
- Monthly Property Taxes
- $1,589
- Monthly Home Insurance
- --
Default based on a 30-year fixed rate of 7.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
Learn more about how to save NearbySingle family listings in Killingworth, CT
Average List Price $714,909
Percent of Sale Price 64%
About Killingworth, CT 6,474 Population
8% Since 2002
$ 106,055 Median Income
51.33 Median Age
29% Households with Children
Trends Information provided by ATTOM Data Solutions.
1186837 Elementary School
1186823 Middle School
Haddam-Killingworth High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 9/16/2026 | $1,995,000 | -11.33% | Price Down |
| 8/13/2026 | $2,250,000 | | Listed Price |