# Arlington Basement ADU: The Most Cost-Effective Way to Add a Fully Independent Living Unit > Expert basement ADU design and construction in Arlington, VA. Design-build experience since 1994. Convert your lower level into a fully permitted, income-generating ADU. - **Source:** https://berrizdesign.com/services/adu/basement-adu/ - **Company:** Berriz Design Build, LLC — Design-build home remodeling and landscape design contractor, founded 1994 - **Contact:** (703) 552-7565 · bob@berrizdesign.com - **Based in:** Arlington, VA - **Service:** Basement ADU - **Service area:** Arlington, VA, McLean, VA, Vienna, VA, Great Falls, VA, Oakton, VA, Alexandria, VA, Clifton, VA, Fairfax Station, VA ## Questions and answers **What is a basement ADU and is it allowed in Arlington?** A basement ADU is an accessory dwelling unit created within the lower level of an existing home. Arlington County permits basement ADUs subject to building code requirements for egress, ceiling height, natural light, and habitability. Berriz Design Build evaluates your basement's ADU potential during the initial consultation. **What are the requirements for a basement ADU in Arlington?** Arlington County requires basement ADUs to meet residential habitability standards: minimum ceiling height (typically 7 feet), egress windows or doors in sleeping areas, adequate natural light and ventilation, separate entrance, kitchen, and bathroom. Berriz Design Build evaluates compliance and addresses deficiencies in the design phase. **How much does a basement ADU cost in Arlington, VA?** Basement ADU conversions in Arlington typically range from $120,000 to $220,000 depending on existing conditions, scope of work, and finish level. This is generally the most cost-effective ADU type. Use our Pricing Guide for current ranges. **Do I need permits for a basement ADU in Arlington?** Yes. A basement ADU requires building permits covering structural, electrical, plumbing, and mechanical work, plus zoning approval as an ADU. Berriz Design Build prepares and manages all permit applications. **Can I rent out my basement ADU in Arlington?** Yes. Arlington County permits basement ADUs to be rented to non-family members, subject to the owner-occupancy requirement for the primary residence. Berriz Design Build designs basement ADUs with rental viability in mind — separate entrance, acoustic separation, and independent utility access where feasible. **Why choose Berriz Design Build for a basement ADU in Arlington?** Arlington basement renovation and ADU experience since 1994, in-house design and construction, and a thorough approach to the moisture, egress, acoustic, and design challenges that determine whether a basement ADU becomes a genuine living space or a compliance problem. ## Page content The Berriz Perspective A basement ADU is the most cost-effective ADU configuration in Arlington — but only when it's designed and built correctly. The most common basement ADU mistake is treating it as a simple finishing project. A basement ADU that passes inspection, earns rental income, and actually feels like a home requires addressing moisture management, egress requirements, ceiling height, natural light, acoustic separation, and independent entrance design. Berriz Design Build has converted basements into fully permitted ADUs throughout Arlington since 1994. We understand the structural and design challenges that separate a basement ADU that works from one that creates ongoing problems. We build it right the first time. Common Questions ## What Arlington Homeowners Ask About Basement ADU ### Discovery & Eligibility What is a basement ADU and is it allowed in Arlington? A basement ADU is an accessory dwelling unit created within the lower level of an existing home. Arlington County permits basement ADUs subject to building code requirements for egress, ceiling height, natural light, and habitability. Berriz Design Build evaluates your basement's ADU potential during the initial consultation. What are the requirements for a basement ADU in Arlington? Arlington County requires basement ADUs to meet residential habitability standards: minimum ceiling height (typically 7 feet), egress windows or doors in sleeping areas, adequate natural light and ventilation, separate entrance, kitchen, and bathroom. Berriz Design Build evaluates compliance and addresses deficiencies in the design phase. ### Cost & Permitting How much does a basement ADU cost in Arlington, VA? Basement ADU conversions in Arlington typically range from $120,000 to $220,000 depending on existing conditions, scope of work, and finish level. This is generally the most cost-effective ADU type. Use our Pricing Guide for current ranges. Do I need permits for a basement ADU in Arlington? Yes. A basement ADU requires building permits covering structural, electrical, plumbing, and mechanical work, plus zoning approval as an ADU. Berriz Design Build prepares and manages all permit applications. ### Process & Partnership Can I rent out my basement ADU in Arlington? Yes. Arlington County permits basement ADUs to be rented to non-family members, subject to the owner-occupancy requirement for the primary residence. Berriz Design Build designs basement ADUs with rental viability in mind — separate entrance, acoustic separation, and independent utility access where feasible. Why choose Berriz Design Build for a basement ADU in Arlington? Arlington basement renovation and ADU experience since 1994, in-house design and construction, and a thorough approach to the moisture, egress, acoustic, and design challenges that determine whether a basement ADU becomes a genuine living space or a compliance problem. Explore the Practice ## Related services ### Detached ADU Expert detached ADU design and construction in Arlington, VA. Design-build experience since 1994. Build a pr… Explore → ### Garage Conversion Expert garage conversion in Arlington, VA. Design-build experience since 1994. 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(703) 552-7565*