Arlington is progressive on ADU regulations, allowing accessory units with streamlined approval. The county's proximity to DC and strong housing market make it attractive for ADU development.
Zoning & Size Requirements
| Allowed Zones | Single-family residential zones |
| Max Size (Detached) | 1,000 sq ft |
| Max Size (Attached) | 850 sq ft |
| Max Size (JADU) | Not allowed |
| Max Height | 35 feet |
| Max Units | 1 ADU per lot |
Setback Requirements
| Rear Setback | 10 feet |
| Side Setback | 3 feet |
| Front Setback | 20 feet |
| Parking Required | 1 space per unit |
| Owner Occupancy | Not required |
| Min Lot Size | 4,000 sq ft |
Permit Process & Fees
| Approval Process | Building permit with streamlined review |
| Review Timeline | 50-75 days |
| Permit Fees | $2,800-$4,500 |
| Impact Fees | $1,000-$1,800 |
| Plan Check | 2-3 weeks |
| Pre-Approved Plans | Available |
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Construction Costs
| Average Build Cost | $170,000-$340,000 |
| Cost per Sq Ft | $170-$340 |
| Garage Conversion | $90,000-$200,000 |
| Prefab ADU (Installed) | $130,000-$290,000 (installed) |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders in minutes.
Compare ADU Financing Options →Rental Income Potential
| Avg Rent (1 Bedroom) | $1,700-$2,200/mo |
| Avg Rent (2 Bedroom) | $2,100-$3,000/mo |
| Short-Term Rental | Not permitted |
| Est. Annual ROI | 5-7% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half. Compare top prefab manufacturers.
Compare Prefab ADUs →Recent Law Changes
What's Changed Recently
- 2024: Streamlined ADU approval process
- 2023: Expanded ADU allowance in residential zones
- 2024: Increased max sizes for both detached and attached
- 2023: Created design guidelines for ADU projects
Tips for Building an ADU in Arlington
- Arlington's DC proximity creates premium rental market
- High property costs offset by strong rents; moderate ROI
- Government workforce provides stable, long-term tenants
- Strong appreciation potential in this premium market
Frequently Asked Questions
Can I build an ADU in Arlington?
Yes. ADUs are allowed in Single-family residential zones in Arlington. The maximum size for a detached ADU is 1,000 sq ft. No owner-occupancy is required.
How much does an ADU cost in Arlington?
ADU construction in Arlington typically costs $170,000-$340,000. Garage conversions run $90,000-$200,000, and prefab ADUs cost $130,000-$290,000 (installed).
How much can I rent an ADU for in Arlington?
Average ADU rents in Arlington are $1,700-$2,200/mo for a 1-bedroom and $2,100-$3,000/mo for a 2-bedroom unit.
Do I need parking for an ADU in Arlington?
1 space per unit. Check with Arlington planning department for the latest Virginia ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Arlington?
The permit review timeline in Arlington is 50-75 days. Fees range from $2,800-$4,500.
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