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451 Mansfield Avenue

Darien, Connecticut 06820

ACTIVE - NEW$6,985,000
Beds
7
Baths
9 | 2
SqFt
9,058
Acres
2.70
Year Built
1999
Matt Caiola

Matt Caiola

Luxury Real Estate Advisor

MCMATT CAIOLALUXURY PROPERTIES
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Pool4-Car Garage6 Fireplaces

About This Home

Set back from the road on 2.7 beautifully landscaped acres, 451 Mansfield Avenue offers the privacy, grandeur, and distinctive character of a true country estate. A sweeping circular drive introduces a grand residence distinguished by its striking stone facade and timeless architectural detailing, a substantial two-story guest house, and a magnificent outdoor setting centered around a 24' x 48' infinity-edge pool. Extensive custom stonework, elegant terraces, and lush grounds enhance the property's distinctive estate-like character. Extensively renovated in 2026, the residence features all- new mechanical systems, new windows, and thoughtfully redesigned interiors. Blending timeless architectural elegance with sophisticated contemporary luxury, the home offers approximately 9,000 square feet of finished living space, including a light-filled 1,600-square-foot walk-out lower level. Inside, a graceful, curved staircase rises from the herringbone-floored foyer, introducing beautifully proportioned rooms, distinctive millwork, and refined architectural detailing. Formal living and dining rooms, each with a custom marble fireplace, provide gracious entertaining spaces, while a richly paneled library with coffered ceiling and fireplace offers a distinguished private study.

Key Facts

City/Town
Darien
Neighborhood
N/A
Property / Style
Single Family · Colonial
Year Built
1999
Days on Market
0 days
Beds
7
Baths
9 full · 2 half
Living Area
9,058 sq ft
Lot Size
2.70 acres
Garage / Parking
4 garage
Property Taxes
$47,118 / Annually

Market Snapshot

The Darien Market

Single Family · trailing 12 months

Median Days on Market

30

30 active listings

Median $ / Sq Ft

$771

30 active listings

Sale-to-List Ratio

106.3%

216 sales

How this home compares

List Price

$6.99M

vs $3.92M median

78.1% above median

Price / Sq Ft

$771

vs $771 median

In line with median

Days on Market

0 days

vs 30 days median

30 days fresher than median

Based on 30 active and 216 closed sales (trailing 12 mo) of single family in Darien. Source: SmartMLS · As of October 13, 2026.

Location

451 Mansfield Avenue, Darien, Connecticut

Property + 12 nearby

Estimate Your Payment

Estimated Monthly Payment

Rates: Freddie Mac PMMS via FRED
$44,945

per month

  • Principal & Interest$38,690
  • Property Taxes$3,927
  • Insurance$2,328
  • HOA$0

Estimates only. Actual rates, taxes, insurance, and HOA fees vary. Consult a lender for current rates.

Location

City/Town
Darien
Neighborhood
N/A
County
Fairfield

Residence

Property Type
Single Family
Style
Colonial
Year Built
1999
New Construction
No/Resale
Living Area
9,058 sq ft
Below Grade
1,586 sq ft

Schools

Elementary
Per Board of Ed
High
Per Board of Ed

Interior

Heating
Hot Air
Heat Fuel
Propane
Cooling
Central Air
Fireplaces
6
Laundry
Upper Level
Appliances
Gas RangeWall OvenMicrowaveRange HoodSubzeroDishwasherWasherElectric DryerWine Chiller
Basement
FullHeatedSump PumpStorageGarage AccessCooledPartially Finished
In-Law Apartment
PossibleDetachedSeparate Entry
Interior Features
Sauna

Exterior & Lot

Lot Size
2.70 acres
Zoning
R2
Garage / Parking
4 garage spacesAttached Garage
Waterfront Details
Not Applicable
Water Source
Public Water Connected
Sewer
Public Sewer Connected
Pool
GuniteHeatedPool HouseInfinity EdgeSalt WaterIn Ground Pool
Construction
StoneWood
Roof
Slate
Foundation
Concrete
Lot Description
Lightly WoodedDryProfessionally Landscaped

Listing & Financials

Property Taxes
$47,118 / Annually
Days on Market
0
MLS #
24213571
MLS Status
Active

Similar Properties

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Listed By

Naima Mazouzi

(860) 754-7651

Eagle Eye Realty PLLC

(860) 263-9102

This information is believed to be accurate, but without warranty.

The IDX display contains information sourced from SmartMLS, Inc. as of 10/13/2026. This information is provided for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing or leasing. Data is deemed reliable but is not guaranteed accurate by the MLS, the listing broker, the listing agent, or Matt Caiola. Buyers and tenants should independently verify all information that matters to their decision.

Map locations may be approximate. Any offer of compensation, if applicable, is made only to participants of the MLS where the listing is filed. ©2026 Smart MLS, Inc. All rights reserved.

Data last updated on 10/13/2026 at 11:55 AM UTC.