Home Assessment Values, Data Center Tax Base Continue To Rise In Loudoun

LOUDOUN COUNTY, VA — Demand for homes is continuing to drive up residential property values in Loudoun County, according to 2025 assessment data provided to the Loudoun County Board of Supervisors. Between higher average home values and revenues from data center development, the county's tax base is trending up.

Property owners will be receiving notices on their assessment values, which represent 100 percent of fair market value as of January 1, 2025. Assessment values combined with the county's real estate tax rate factor into the annual tax bills that property owners in Loudoun County will pay on June 5 and Dec. 5, 2025. A lower real estate tax rate isn't ruled out, as a board committee in November requested it in the county executive's upcoming budget proposal.

Loudoun County's tax base is up 19.5 percent to $170.5 billion, according to a presentation from the Commissioner of the Revenue's office. Much of the increase — $24.1 billion — is due to equalization of existing properties. Another $3.6 billion came from new construction, and $186 million is from growth of new lots.

"The restricted supply of homes available for sale in the county during 2024 continued to put pressure on sales prices and therefore are reflected in higher assessed values," said Robert S. Wertz Jr., Loudoun County's commissioner of the revenue. "Regarding commercial real estate, anyone in Loudoun knows it’s all about data centers. This sector saw the largest increase in values of all types of commercial property, up 78.7%." The total value of taxable commercial property in the county is $56.6 billion, an increase of 45.3% compared to 2024.

The average single-family home price in Loudoun County is up to $983,625 from $910,828 last year. Single-family home values in developed areas are up an average 7.34 percent, which is more than the 4.67 average increase in 2024 and similar to the 7.45 percent of 2023. Rural single-family homes up to 20 acres increased by an average 7.39 percent, those below 100 acres increased by an average 5.85 percent, and rural homes over 100 acres increased by an average 2.66 percent.

Townhouse prices stand at an average $633,998, compared to $598,229 last year. Townhouse values rose by an average 5.13 percent, close to the 4.96 percent in 2024 and 5.89 percent in 2023.

Condos are valued at an average $439,521, up from $411,774 last year. Condo values increased by an average 3.14 percent, compared to 3.72 percent in 2024 and 5.76 percent in 2023.

Property values changes due to equalization only by district are:

• Sterling District: 6.3 percent
• Algonkian District: 6.8 percent
• Leesburg District: 6.5 percent
• Broad Run District: 5.7 percent
• Ashburn District: 6.7 percent
• Dulles District: 6.2 percent
• Catoctin District: 8.7 percent
• Little River District: 6.5 percent

On the commercial side, data centers accounts for 22.9 percent of the county's property tax base. The collective value of data centers in Loudoun County increased 78.7 percent from $23.705 billion to $42.352 billion.

Printed assessment values will be mailed to property owners on Friday. The Commissioner of the Revenue's office says property owners may see assessment value changes less or more than the averages.

Property owners who believe their assessments are inaccurate can file for a review by March 14 at loudoun.gov/reaa. Appeals may be made to the Board of Equalization until June 2.