2026 real property reassessment: Loudoun'wide values rise as data-center valuations swell; notices to be mailed
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Summary
County staff reported a 2026 assessed real property total of roughly $185.7 billion (a 12.4% increase year-over-year), slower residential appreciation, and continued strong data-center growth representing about 26% of county commercial value; assessment notices will be mailed and administrative review deadlines were announced.
Loudoun County property assessment staff presented the 2026 annual real property reassessment on Feb. 3, reporting a countywide assessed value of approximately $185.7 billion, a 12.4% increase from the prior year (an estimated $19.9 billion change).
Staff said the revaluation (excluding new construction) produced a countywide percent change of 9.5%. New construction added roughly $3.4 billion in assessed value (about $1.2 billion residential and $2.2 billion commercial). Residential market appreciation slowed compared with prior years: assessed values for single-family detached homes increased about 1.9% on average, while townhouses and condominiums saw smaller gains.
Commercially, data centers continue to drive valuation growth: staff reported that data centers now represent roughly 26% of county taxable value and that data-center square footage increased to about 53.3 million square feet in 2026. Broad Run and Sterling magisterial districts showed significant commercial increases primarily attributable to data-center revaluation and construction.
Practical items for property owners: assessment notices will be mailed this week and will include a QR code linking to a Spanish translation; property owners may request an administrative review online through March 16 (loudoun.gov/reaa) and may appeal to the Board of Equalization by June 1. Notices will include the appraiser's name and contact information so owners can discuss parcel-specific characteristics and sales used in valuation.
Staff asked property owners to review parcel details online (parcel database) and to contact the assessor's office if information (bathroom count, fireplaces, garage counts, effective age) is incorrect.
Next steps: assessment staff will post the annual summary and continue to provide district-level breakdowns and individual parcel support through the administrative review and appeals period.