451 Mansfield Avenue, Darien, Connecticut 06820

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.

Flood risk: check the FEMA flood map for this address.

Taxes

Interior

Building & Exterior

Lot & Land

What it would cost per month

An estimate you can adjust — not a quote, and not an offer of credit. Principal and interest only, plus the taxes and HOA already on this listing. Insurance, PMI and closing costs are not included. Rate seeded at 6.5% (August 2026); change it to whatever your lender quotes.

What's nearby

Distances are straight-line from the property, not driving or walking routes. Places data © OpenStreetMap contributors.

Recent comparable sales

The 5 closest recent sales to this home, nearest match first — same building where possible, then the surrounding streets, widening only when there is nothing closer. These are recorded sale prices from the MLS, not estimates. No automated valuation is shown, because what a home is worth depends on condition, layout and timing that a formula cannot see — call John at 203·883·3399 to read them properly against this home.

5 comparable sales — median $5,625,000, ranging $4,795,000 to $13,000,000.

Within a 15-minute walk, sold in the last year
• 27 Hillsley Road6 bd · 6 ba · 7,670 sq ft · 0.6 mi away
  $5,200,000$677/sq ft2026-06-25
• 316 Mansfield Avenue5 bd · 7 ba · 9,039 sq ft · 0.6 mi away
  $5,625,000$622/sq ft2026-07-24
• 74 Salisbury Road5 bd · 6 ba · 6,798 sq ft · 0.7 mi away
  $4,795,000$705/sq ft2026-06-23
• 304 Brookside Road6 bd · 8 ba · 7,344 sq ft · 0.7 mi away
  $6,095,000$829/sq ft2026-07-16
• 865 Hollow Tree Ridge Road5 bd · 10 ba · 10,197 sq ft · 0.7 mi away
  $13,000,000$1,274/sq ft2026-07-01

Public record

From the Darien assessor's public property record. These figures describe the property as the town has it on file and can differ from the listing — a finished basement or an addition may not be reflected in the assessor's living area.

Recorded sales

Deed transfers on file with the Darien land records, newest first. These are recordings rather than MLS sales, so they include transfers that were never listed. Nominal and $0 transfers (estate, trust and family conveyances) are excluded.

• 2023-02-14$480,000Single Family
• 2021-09-09$800,000Single Family

More homes in Darien

Closest in price to this one.

• 460 Middlesex Road5 bed · 8 bath · 10,213 sq ft$6,995,000
• 24 Arrowhead Way5 bed · 9 bath · 8,388 sq ft$6,250,000
• 246 Brookside Road7 bed · 9 bath · 8,100 sq ft$7,900,000
• 16 East Trail9 bed · 10 bath · 8,188 sq ft$7,950,000
• 67 Peach Hill Road6 bed · 9 bath · 8,068 sq ft$5,995,000
• 3 Coves End Road5 bed · 7 bath · 5,172 sq ft$7,995,000

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