20 Oak StreetGreenwich, CT 06831

Single Family · 5 Beds · 7 Full Baths · 2 Half Baths · 8,603 Sq. ft. | 0.70 Acres
$5,400,000 Active

20 Oak Street Overview

Time on Site:
42 days

Set on a quiet private lane, this 8,600-square-foot residence spans four finished levels with elevator access throughout. A marble entry gallery with soaring ceilings introduces expansive living and entertaining spaces, including a formal dining room with wet bar, chef's kitchen with Viking, Bosch, and Sub-Zero appliances, and a sunlit family room opening to outdoor dining areas. The home offers five en-suite bedrooms with walk-in closets, including a luxurious primary suite with fireplace and spa bath. The finished walkout lower level features a recreation lounge, wine cellar, fitness studio, media space, and full bath. Additional highlights include hardwood floors, multiple fireplaces, private office space, and mature landscaping throughout the property. 5 minutes from Greenwich Avenue. Set on a private lane of just three homes, this expansive residence offers 8,600 square feet of living space across four finished levels, all accessible by elevator. A marble-floored entry gallery with soaring ceilings creates a dramatic first impression, immediately establishing the scale, light, and craftsmanship found throughout the home. The main level is designed for both grand entertaining and comfortable everyday living. A formal living room is framed by expansive wraparound bay windows, filling the space with natural light. Wide pocket doors open to an elegant formal dining room featuring a wet bar. The chef's kitchen is outfitted with high-end appliances, including a Viking six-burner cooktop with grill, dual wall ovens, dual Miele dishwashers, and Sub-Zero refrigeration. A large center island anchors the space and flows seamlessly into a sunlit breakfast area and spacious family room. French doors open to generous outdoor entertaining and dining areas. A wood-burning fireplace enhances the warmth of the main living area. Additional features include a private office with dual workspace capacity and French doors to the outdoors, multiple wet bars, two powder rooms, and hardwood flooring throughout. The bedroom level offers five spacious bedrooms each with en-suite bath and walk in closet. The fifth bedroom is oversized and flexible, suitable as a bonus room, playroom, or studio. The primary suite is a private retreat featuring a third wood-burning fireplace, heated bathroom floors, a BainUltra air-jet soaking tub, oversized shower, private water closet, and extensive custom cabinetry. The walkout lower level is fully finished and designed as a true lifestyle extension of the home. It features a large recreation lounge with wet bar, a dedicated wine room with tasting area, a media space with fireplace, a mirrored fitness studio with TV, and a full bath--creating an ideal setting for both relaxation and entertainment. The top floor provides full-height ceilings and exceptional flexibility, ideal for use as a studio, office, playroom, or additional guest space, complete with a full bath and storage. A two-car polyphasic garage complete the property, which is surrounded by mature landscaping in a serene residential setting just 5 minutes to Greenwich Avenue.

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20 Oak Street Facts & Features

  • Type Single Family
  • Sq. ft. 8,603
  • Price/Sq.ft. $628
  • Lot 0.70 Acres

Details

General

School Information

  • Elementary School: Glenville
  • Middle Or Junior School: Western

Building Information

  • Year Built: 2004

Location/Region

  • County Or Parish: Fairfield
  • MLS Area Major: 3 - Greenwich
  • MLS Area Minor: 3 - Greenwich

Tax Information

  • Tax Annual Amount: $31,433.00
  • Tax Assessed Value: $2,543,310.00

General Information

  • Inclusions: Washer/Dryer, All Kitchen Applncs
  • Parcel Number: 03-1879/S
  • Property Sub Type: Single Family Residence
  • Property Type: Residential
  • Zoning: R-12

Interior

Parking Information

  • Garage Spaces: 2.0

Beds/Baths

  • Bathrooms Full: 7
  • Bathrooms Half: 2
  • Bathrooms Total: 9
  • Bedrooms Total: 5

Building Interior

  • Building Area Source: Architect
  • Building Area Total: 8603.0

General Information

  • Basement: Walk-Out Access, Finished
  • Fireplace: Yes
  • Fireplaces Total: 3
  • Interior Features: Sep Shower, Elevator
  • Laundry Features: Laundry Room
  • Security Features: Security System

Exterior

Parking Information

  • Parking Features: Attached Garage, Garage Door Opener

Lot Information

  • Lot Features: Backlot, Level
  • Lot Size Acres: 0.7
  • Lot Size Area: 0.7
  • Lot Size Square Feet: 30492.0
  • Lot Size Units: Acres
  • Water Source: Public

Building Exterior/Construction

  • Architectural Style: Colonial
  • Construction Materials: Clapboard, Stone
  • Patio And Porch Features: Terrace, Deck
  • Roof: Architectural Shngle

General Information

  • Exterior Features: Balcony, Rock Garden
  • Pool Private: No
  • Sewer: Town Sewer

20 Oak Street Monthly Cost

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* All calculations are estimates and provided by Reliance Network, for informational purposes only. Actual amounts may vary. ** Assumes 6.50% APR, 20% down payment, and conventional 30-year fixed rate first mortgage. Rates cited are for instructional purposes only; current rates are subject to change at any time without notice. You should not make any decisions based simply on the information provided. Additional required amounts such as taxes, insurance, homeowner association dues, assessments, mortgage insurance premiums, flood insurance or other such required payments should also be considered. Contact your mortgage company for current rates and additional information. Any mortgage broker or insurance agent that may appear is independent and is not affiliated with, endorsed by, or provided by the MLS.

20 Oak Street Market Data

Based on the last 30 days in this zip code

$5,601,654
Average List Price
$881
Average Price per Square Foot
22
Properties Sold
80
Average Days on Market
128
Properties for Sale
Calculations provided by Reliance Network

20 Oak Street History

Date Event Value Agent
5/18/2026Source: Greenwich MLS Added to Database
May 18, 2026
Listing provided courtesy of Brown Harris Stevens CT, LLC- MLS# 125038MLS Provider