20 Oak Street, Greenwich, CT 06831 (MLS# 125038)


$5,400,000
20 Oak Street
Greenwich, CT 06831
MLS# 125038
5 beds  |  7.2 baths  |  8603 sqft


Foyer
  1 / 53  
Foyer Foyer Foyer Half Bath Entry Hall/Gallery Formal Living Room Formal Dining Room Formal Dining Room Wetbar between Dining Room and Kitchen Kitchen Kitchen Breakfast Area Family Room and Breakfast Area from Kitchen Family Room Family Room Family Room Half Bath off Family Room and Office Wetbar off Family Room and Office Office Elevator and Walkup to Third Level Primary Bedroom Primary Bedroom Primary Bathroom Primary Bathroom Primary Bathroom Primary Closet Bedroom 2 Bedroom 3 Bedroom 4 One of the En-Suite Baths Bedroom 5 Second Floor Laundry Room Third Floor Sleeping Area Third Floor Third Floor with Golf Simulator - Note the High Ceilings Walkout Lower Level Lower Level with Wetbar, Lounge, Games Area Lower Level Media/Family Room Wine Cellar Gym Lower Level Full Bathroom Front Front Front Aerial Front Rear Outdoor Dining and Lounge Area Lounge Area Aerial Deck/Yard Aerial Rear Aerial Rear Aerial Rear Aerial Deck Lower Level Yard
Open House (05/24/2026 - 1:00 pm - 3:00 pm)

Property Description
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.

Details
Maps
Location & Property Info
List Price/SqFt: 627.69
Zoning: R-12
Owner Financing: No
Section: Glenville
For Rent: No
CIOA: No
# HBths: 2
# FPs: 3
General Property Info
Acres +/-: 0.7
Year Renovations: 2023
Elementary School: Glenville
Middle School: Western
Pool: No
Court: No
Year Built: 2004
Garage #: 2
SqFt +/-: 8603
Tax & Misc Info
Assessment: 2543310
Mill Rate: 12.359
Taxes: 31433
Remarks & Misc
Directions: From town, west on Putnam Avenue, right on Oak Street, Left into private lane, last house.
Exterior
Clapboard: 1
Stone: 1
Design
Colonial: 1
Heat System
Forced Air: 1
Entry Hall Level/FP
1st: 1
Heat Fuel
Natural Gas: 1
Entry Hall Ceilings
Cathedral: 1
Entry Hall Comments
Grand Entrance: 1
Marble Floor: 1
Living Room Level/FP
1st: 1
Living Room Ceilings
Extra Height: 1
Attic
Finished: 1
Living Room Comments
Pocket Door: 1
Lot Description
Backlot: 1
Level: 1
Roof
Architectural Shngle: 1
Dining Room Level/FP
1st: 1
Dining Room Ceilings
Extra Height: 1
Cooling System
Central Air: 1
Dining Room Comments
Formal: 1
Library/Den Level/FP
1st: 1
Library/Den Ceilings
Extra Height: 1
Water Source
Public: 1
Sanitation Source
Town Sewer: 1
Library/Den Comments
Pocket Door: 1
Gas Source
Public Utility: 1
Family Room Level/FP
1st: 1
LL: 1
FP: 2
Family Room Ceilings
Extra Height: 1
Documents Available
Call LB: 1
Fact List: 1
Improvements List: 1
Family Room Comments
Wet Bar: 1
Powder Room Level/FP
1st: 2
Powder Room Ceilings
Extra Height: 1
Kitchen Level/FP
1st: 1
Parking Description
Attached Garage: 1
Kitchen Ceilings
Extra Height: 1
Kitchen Comments
Adjacent Family Room: 1
Breakfast Room: 1
Primary Bdrm Level/FP
2nd: 1
FP: 1
Primary Bdrm Ceilings
Extra Height: 1
Included
All Kitchen Applncs: 1
Washer/Dryer: 1
Primary Bdrm Comments
Primary Bedroom Suite: 1
Sitting Area: 1
Walk-in Closet(s): 1
Primary Bath Level/FP
2nd: 1
Primary Bth Ceilings
Extra Height: 1
Primary Bth Comments
Sep Shower: 1
Updated in Past 5 Yr: 1
Dbl Bdrms Level/FP
2nd: 4
Dbl Bdrms Ceilings
Extra Height: 1
Bath Level/FP
2nd: 4
3rd: 1
LL: 1
Bath Ceilings
Extra Height: 1
Laundry Level/FP
2nd: 1
Laundry Ceilings
Extra Height: 1
Laundry Comments
Separate Room: 1
Other Room Level/FP
3rd: 1
Other Room Ceilings
Cathedral: 1
Other Room Comments
See Remarks: 1
Other Room Level/FP 2
LL: 1
Other Room Comments 2
Wine Cellar: 1
Other Room Level/FP 3
LL: 1
Other Room Comments 3
Exercise Room: 1
Hot Water
Gas: 1
Basement Type
Finished: 1
Walk-Out Access: 1
Features
Auto Garage Door: 1
Balcony: 1
Deck: 1
Elevator: 1
Rock Garden: 1
Security System: 1
Sprinkler System: 1
Terrace: 1
Excluded
See Remarks: 1
Location Property Info
List Price: $5,400,000
Type: Single Family Residence
Street #: 20
Street Name: Oak
Street Suffix: Street
State: CT
Zip Code: 06831
County: Fairfield
Area: 3 - Greenwich
Property ID: 03-1879/S
# Bdrms: 5
# FBths: 7
Baths: 7.2
OfficeContract Info
Status: Active
List Date: 2026-05-18
Property Features
Entry Hall Ceilings: Cathedral
Entry Hall Comments: Grand Entrance; Marble Floor
Living Room Ceilings: Extra Height
Living Room Comments: Pocket Door
Dining Room Ceilings: Extra Height
Dining Room Comments: Formal
Family Room Ceilings: Extra Height
Family Room Comments: Wet Bar
Powder Room Ceilings: Extra Height
Kitchen Ceilings: Extra Height
Kitchen Comments: Adjacent Family Room; Breakfast Room
Primary Bdrm Ceilings: Extra Height
Primary Bdrm Comments: Primary Bedroom Suite; Sitting Area; Walk-in Closet(s)
Primary Bth Ceilings: Extra Height
Primary Bth Comments: Sep Shower; Updated in Past 5 Yr
Dbl Bdrms Ceilings: Extra Height
Bath Ceilings: Extra Height
Laundry Ceilings: Extra Height
Laundry Comments: Separate Room
Other Room Ceilings: Cathedral
Other Room Comments: See Remarks
Other Room Comments 2: Wine Cellar
Other Room Comments 3: Exercise Room
Design: Colonial
Cooling System: Central Air
Heat System: Forced Air
Heat Fuel: Natural Gas
Hot Water: Gas
Attic: Finished
Basement Type: Finished; Walk-Out Access
Water Source: Public
Sanitation Source: Town Sewer
Gas Source: Public Utility
Exterior: Clapboard; Stone
Parking Description: Attached Garage
Roof: Architectural Shngle
Lot Description: Backlot; Level
Documents Available: Call LB; Fact List; Improvements List
Features: Auto Garage Door; Balcony; Deck; Elevator; Rock Garden; Security System; Sprinkler System; Terrace
Included: All Kitchen Applncs; Washer/Dryer
Excluded: See Remarks
Supplements
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.

Listing Office: Brown Harris Stevens CT, LLC

Last Updated: May - 24 - 2026

Listing information comes from various sources and may not always be accurate. No representation or warranty is made as to the accuracy of this information. You should verify any information that is important to your buying decision. Greenwich Multiple Listing Service, Inc.