Arlington In-Law Suite: Private Space for Family That Doesn't Compromise Anyone's Independence

An in-law suite is a self-contained living space within or attached to the primary home, designed for a family member. A complete in-law suite typically includes a private entrance, bedroom, bathroom, and kitchenette or kitchen. Berriz Design Build designs each suite based on the specific needs of the person who will occupy it.

Common locations include finished basements, first-floor additions, above-garage spaces, and main-level room conversions. The best location depends on your home's existing layout, the family member's mobility needs, and your budget. Berriz Design Build evaluates all options during the initial consultation.

In-law suite costs in Arlington typically range from $80,000 for a basic interior conversion to $250,000+ for a comprehensive addition with full kitchen and private entrance. Use our Pricing Guide for current ranges.

Yes. Any in-law suite that includes electrical, plumbing, or structural changes requires Arlington County permits. If the suite qualifies as an ADU under Arlington's ordinance, additional zoning approval is required. Berriz Design Build manages all permit requirements.

Acoustic separation requires sound-rated wall and ceiling assemblies, solid-core doors, and careful attention to HVAC duct routing. Berriz Design Build incorporates acoustic separation as a standard design consideration in every in-law suite project.

36+ years of Arlington renovation experience, in-house design and construction, and a genuine understanding of what makes an in-law suite work for the whole family — not just the person who will occupy it.