AR-2 Pre-Design Checklist for Loudoun County
An essential pre-design checklist for properties in Loudoun County's AR-2 (Agricultural Rural – 2) zoning district — permitted uses, setback requirements, well and septic considerations, lot coverage, and critical planning steps before any design contract is signed.
What the Checklist Covers
- Permitted uses — what can and can't be built in AR-2: residential, agricultural, and accessory structures.
- Setback requirements — front, side, and rear setbacks for primary structures, accessory buildings, and agricultural uses.
- Well & septic considerations — Health Department requirements, perc testing, well drilling, and septic system design for AR-2 parcels.
- Lot coverage & density — maximum coverage ratios, building height limits, and density restrictions in AR-2.
- Critical planning steps — pre-design due diligence: surveys, soil tests, environmental reviews, and permit applications.
- Application requirements — what to submit for zoning permits, building permits, and site plan approvals in Loudoun County.
The 8-Step AR-2 Pre-Design Sequence
- Confirm AR-2 designation. Verify the parcel is AR-2 and review any overlay districts (Mountainside, Scenic Creek Valley, Historic) that affect setbacks and design review.
- Pull deed and plat records. Review the recorded plat and deed for easements, conservation restrictions, density credits, and prior subdivision history.
- Order a soil evaluation. Schedule a Virginia Department of Health soil test to confirm primary and reserve drainfield areas. Request re-evaluation under the 2024 amended soil criteria if previously failed.
- Confirm well yield and setbacks. Locate or drill a well, verify yield (typically 3–5 GPM minimum), and map required setbacks from septic, property lines, and drainfields.
- Define use before design. Document whether the structure is single-family, agricultural, equestrian, or assembly. AR-2 by-right uses differ sharply from special-exception uses.
- Test the buildable envelope. Overlay setbacks, easements, slopes, soils, and utility access to identify the buildable area before committing to a design footprint.
- Engage a pre-application conference. Meet with Loudoun County Planning & Zoning to surface classification questions, overlay reviews, or special exception triggers early.
- Build the project budget. Combine site work, well, septic, utilities, soft costs, and construction into a realistic estate budget — AR-2 builds rarely come in below $1.5M turnkey.
Why It Matters
AR-2 carries a 2-acre minimum lot, deeper setbacks (typically 100 ft front and rear), tighter coverage limits, and a stronger conservation orientation than AR-1. On a narrow or irregularly shaped parcel, the setback delta alone can shrink the buildable envelope by an acre or more. Working through this checklist before design begins eliminates the most expensive mistakes — failed perc tests, undersized buildable envelopes, and use definitions that trigger special-exception review.