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Front exterior of a new home in RiverTown, St. Johns, FL, highlighting curb appeal (Image 1).
Under construction
  • 4 bd
  • 5 ba
  • 3,644 sqft
Home inRiverTownbyMattamy HomesOnyx Plan

378 Sir Barton Dr, St. Johns, FL 32259

$889,844

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  • Single-Family
  • Ready by May 2026
  • $244.19/sqft
  • $53/annual HOA

Home description

Lot 82 - Discover the Onyx, a beautifully crafted 4-bedroom, 4.5-bath home with generous living space and a 3-car garage that blends comfort with sophistication. Off the foyer, a private study replaces the flex room, creating an ideal home office or quiet retreat. The chef-inspired kitchen features a large island and convenient morning kitchen near the walk-in pantry, flowing seamlessly into the open Great Room and covered lanai for effortless indoor-outdoor living. The owner's suite offers a spa-like bath and oversized walk-in closet, while each secondary bedroom includes its own private bath and walk-in closet, with Bath 2 upgraded to a walk-in shower. Located in RiverTown along the St. Johns River, residents enjoy parks, trails, lakes, fitness amenities, and a vibrant outdoor lifestyle.

Listed by MATTHEW BERKIS, Matt.Berkis@mattamycorp.com
MATTAMY REAL ESTATE SERVICES, MLS 2130796

May also be listed on the Mattamy Homes website

Information last verified by Jome: Today at 1:31 AM (February 20, 2026)

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Estimated value based on Jome data, T&C apply

Home details

*Pricing and availability are subject to change.
Property status:
Under construction
Size:
3,644 sqft
Stories:
1
Beds:
4
Baths:
5
Half baths:
1
Garage spaces:
3
Facing direction:
Southeast
Onyx image

Floor plan details

Onyx

from$814,990
  • 4 bd
  • 4.5 ba
  • 3,644 sqft

View Onyx details

Onyx

Construction details

Builder Name:
Mattamy Homes
Completion Date:
May, 2026
Year Built:
2025
Roof:
Shingle Roofing

Home features & finishes

Appliances:
Sprinkler System
Construction Materials:
CementFrame
Cooling:
Central Air
Garage/Parking:
Door OpenerGarageAttached Garage
Interior Features:
Walk-In ClosetFoyerPantryBreakfast Bar
Kitchen:
DishwasherMicrowave OvenRefrigeratorDisposalGas CooktopFreezerKitchen IslandDouble Oven
Laundry facilities:
DryerWasherUtility/Laundry Room
Property amenities:
Porch
Rooms:
Primary Bedroom On MainKitchenDining RoomFamily RoomBreakfast AreaOpen Concept FloorplanPrimary Bedroom Downstairs
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Utility information

Heating:
Thermostat, Water Heater, Central Heating, Tankless water heater
Utilities:
Electricity Available, Sewer Available, Water Available
RiverTown image

Community details

RiverTown at RiverTown

by Mattamy Homes, St. Johns, FL

from$241,490
  • 109 homes
  • 44 plans
  • 1,206 - 4,461 sqft

View RiverTown details

RiverTown

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Pricing and availability are subject to change.
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Floor plans in RiverTown

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2+ beds
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About the builder - Mattamy Homes

Mattamy Homes
With a legacy spanning over four decades, Mattamy Homes designs new construction homes and communities centered on how families truly live. As North America's largest privately owned homebuilder, the company is recognized for its architectural innovation and thoughtful neighborhood planning, helping more than 8,000 families find their dream home each year.

Neighborhood

Home address

378 Sir Barton Dr, St. Johns, FL 32259
County:
St. Johns
Zip Code:
32259
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Schools in St. Johns County School District

Students living in Sir Barton Dr by Mattamy Homes follow a designated feeder pattern within the St. Johns County School District. The journey starts at Hickory Creek Elementary School, serving Elementary grades just 1.9 mi from the neighborhood. From there, students advance to Switzerland Point Middle School, a public campus for Middle grades located roughly 1.7 mi away. Education culminates at Bartram Trail High School, supporting High grades within 3.3 mi and holding a rating of 9. This progression outlines the academic options in St. Johns, Florida.
GreatSchools.org logo

GreatSchools’ Summary Rating calculation is based on 4 of the school’s themed ratings, including test scores, student/academic progress, college readiness, and equity. This information should only be used as a reference. Jome is not affiliated with GreatSchools and does not endorse or guarantee this information. Please reach out to schools directly to verify all information and enrollment eligibility. Data provided by GreatSchools.org © 2025

Places of interest

Getting around

Local travel options for Sir Barton Dr by Mattamy Homes are defined by specific mobility scores that impact daily life. The Walk Score stands at 1 (Car-Dependent), providing a baseline for foot travel. Biking capability is rated at 31 (Somewhat Bikeable). These details focus on getting around St. Johns, Florida.
Walk score ®
1 /100
Car-Dependent
Bike score ®
31 /100
Somewhat Bikeable

Noise level

Environmental sound levels for RiverTown by Mattamy Homes are quantified by a composite rating that aggregates multiple factors. According to data from Soundscore, the overall Noise Score is Calm, which is classified as Calm. This measurement accounts for specific contributors, including traffic (Calm), local sources (Calm), and airport activity (Calm). These metrics provide a baseline for understanding noise levels in St. Johns, Florida.
99
50Calm100
Traffic noiseCalm
Local sources noiseCalm
Airports noiseCalm

A Soundscore™ rating is a number between 50 (very loud) and 100 (very quiet) that tells you how loud a location is due to environmental noise.

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Real MLS Logo
Listed by MATTHEW BERKIS, Matt.Berkis@mattamycorp.com
MATTAMY REAL ESTATE SERVICES, MLS 2130796

IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Data is deemed reliable but is not guaranteed accurate by NEFMLS. © 2025 Northeast Florida Multiple Listing Service, Inc. All rights reserved.

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Last checked Feb 20, 11:00 am

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  3. Florida
  4. Jacksonville Metropolitan Area
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  6. St. Johns
  7. RiverTown
  8. RiverTown - Springs
  9. 378 Sir Barton Dr, St. Johns, FL 32259