Arlington ADU: The One Decision That Changes Everything About Your Property

An Accessory Dwelling Unit (ADU) is a secondary housing unit on a single-family residential lot. Arlington, VA allows ADUs under its Zoning Ordinance, including attached, detached, and interior (basement) configurations. Berriz Design Build navigates Arlington County's specific setback, height, and permitting requirements on your behalf.

Arlington permits three primary types: detached (backyard cottages built as separate structures), attached (additions connected to the main home), and interior (basement or above-garage conversions). The right choice depends on your lot size, zoning setbacks, and budget.

ADU costs in Arlington typically range from $150,000 to $400,000+ depending on type, size, and finish level. A basement ADU conversion generally costs less than a detached backyard cottage. Use the Pricing Guide button above for current ranges.

Arlington County ADU permits typically take 6–14 weeks for approval. Berriz Design Build prepares complete permit packages that minimize revision cycles — one of the most common causes of project delays for homeowners working with less experienced contractors.

Yes. Arlington County allows ADUs to be rented to non-family members, making them a strong income-generating asset. We design ADUs with rental viability in mind — separate entrances, sound insulation, and independent utility access where applicable.

Berriz Design Build has served Arlington and Northern Virginia for over 36 years. We handle the entire ADU process in-house: design, permitting, construction, and final walkthrough. Our integrated design-build model means fewer surprises and faster timelines.