4400 County Road 123 Round Rock, TX $ 800,000
4400 County Road 123
$ 800,000
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4400 County Road 123

Round Rock, TX, 78664
$ 800,000
Bedrooms4 Baths2.0 Sq 2,025

Monthly Estimate*

$ 4,926

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Single Family Home for sale in Round Rock, TX

for $800,000 with 4 bedrooms and 2 full baths. This 2,025 square foot home was built in 1978 on a lot size of 1.

Rare 1 acre property featuring a fully updated, taken-to-the-studs, ~$523K remodel on a 1 story home plus an exceptional 900 sqft insulated workshop which includes a 200 sqft office space. Properties offering this combination of land, full remodel quality, and a modern shop setup are extremely limited in this area. The ~$523K in upgrades completed deliver a turnkey, highly functional residence and workspace. The home includes approx. ~1,825 sq ft of added living area, Hardie siding, new plumbing with insulated Pex, fully replaced HVAC system with variable-speed AC and LP furnace, complete electrical upgrades including 200-amp service to both house and shop, new windows, new interior/exterior doors, new trim, and full flooring replacement (LVP/tile/carpet). Kitchen and baths feature custom cabinetry, new granite countertops, soft-close hardware, and full appliance replacements (KitchenAid double oven, microwave, dishwasher, 36” gas cooktop, GE exhaust vent). More improvements include new dimensional roof, blown-in attic insulation, LED lighting throughout, fireplace rebuild, full laundry/utility room addition, new 4th bedroom, privacy fencing, new driveway, sidewalks, + extensive landscape upgrades. The 30’x30’ workshop is a major highlight with insulated walls/roof (closed-cell spray foam), (2) 16’ electric lift insulated doors, 40” soaker sink with water heater, temperature-controlled exhaust system, separate 200-amp service, 30-amp generator plug, dedicated appliance circuits, interior/exterior 220V plugs, conditioned 20’x10’ office with storage, reclaimed-wood exterior accents, and LED interior/exterior lighting. A covered trailer/storage bay with gate access adds even more utility. All with a backyard paradise that backs into the creek. Ideal for owners needing land, shop space, functionality, and a fully modernized home—in a prime Round Rock location with quick access to toll roads & highways, Samsung, Dell, Amazon, Emerson, etc. **Ask for 3-page upgrade sheet

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Single Family Active

Price

$ 800,000

Bedrooms

4

Full Bath

2

Property Type

Single Family

Taxes

$ 6,860

Style

Single Family Residence

Lot Size

1

Year Built

1978

Town/City

Round Rock

County/Region

Williamson

MLS | Web ID

3238865

Features
General
Living Area 2025
Sewer Septic Tank
Heating Central
Cooling Central Air
Utilities Electricity Available Propane
Roof Composition
Appliances Dishwasher Gas Cooktop Microwave Oven
Garage Spaces 2
Patio/Porch Features Covered Patio
Pool Features None
Construction Materials Brick Veneer Masonry – Partial
Year Built 1978
View City
Levels One
Property Subtype Single Family Residence
Tax Year 2025
Waterfront Features See Remarks Creek Waterfront
Community Features None
Accessibility None
County Williamson
New Construction N
Property Type Residential
HOA N
Energy Efficient None
Subdivision Name Low Water Crossing On Brushy Creek
Facing Direction South
Green Sustainability None
Other Structures None
Full Baths 2
Status Active
Directions east on HW 79 right on Red Bud left on CR 123
High School Hutto
City Round Rock
Body of Water Brushy Creek
Disclosures See Remarks
MLS Area HU
Lot Size Square Feet 43560
Spa Features None
Elementary School Hutto
Tax Annual Amount 6859.86
Middle/Junior High School Hutto
Property Condition Resale
Additional Parcels Y/N N
Virtual Tour https://youtu.be/JoWIgDN4v-Y https://youtu.be/JoWIgDN4v-Y
Standard Status Active
Year Built Source Public Records
Tax Assessed Value 389979
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Interior
Interior Amenities Vaulted Ceiling(s) Stone Counters Kitchen Island Open Floorplan Primary Bedroom on Main Walk-In Closet(s)
Flooring Carpet Tile Vinyl
Total Fireplaces 1
Fireplace Features Family Room
Window Features Blinds
Half Baths 0
Total Bedrooms 4
Main Level Bedrooms 4
Total Baths 2
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Exterior
Exterior Amenities None
Fencing None
Parking Features Attached
Lot Features Trees-Heavy Trees-Large (Over 40 Ft)
Water Source Public
Total Parking 6
Foundation Details Slab
Lot Size Acres 1
Waterfront Y/N Y
Covered Spaces 2
Horse Y/N N
Horse Amenities None
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Internal Only
Street Number 1 4400
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* Excluded Features
List By
Robert Fischer

Listing Agent

Keller Williams Realty-Rr

Broker

offers@RJFteam.com

Email

Affordability Calculator

$5,497
Per Month
90%
10%
0%
Monthly Principal & Interest
$4,926
Monthly Property Taxes
$572
Monthly Home Insurance
--
Default based on a 30-year fixed rate of 6.25% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
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Nearby
4360531 Elementary School
4360400 Middle School
Hutto High School High School
Pricing History
DatePricePrice ChangeDescription
12/8/2025$800,000 Listed Price

Map


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4400 County Road 123, Round Rock, TX, 78664 is a Single Family Home for sale at $800,000 with 2,025 sqft and a lot size of 1. 4400 County Road 123 has 4 bedrooms, 2.0 baths, and was built in 1978. The property's zip code is 78664 which is in Round Rock, TX