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Radon testing
A continuous monitor on the lowest level that could be used regularly, read every hour for at least 48 hours. The written result comes the day we collect it.
4.9 rating, over 4,000 reviews NRSB-certified technicians Serving Fairfax County
A radon test in Annandale is $185, or $175 when it is added to a home inspection. That is the whole price: both visits, the monitor for the full 48 hours, and the written report with every hourly reading in it. A normal booking covers one Annandale residence. Multifamily common space, a separately leased lower unit or another dwelling should be identified for separate authorization and pricing.
Day 1
Drop-off
A technician places it on the lowest level that could be used regularly, following EPA placement limits and the intended use of the space, inside a two-hour arrival window. With a home inspection, placement happens during the inspection visit.
48 hours
The house stays closed
For a short-term real-estate test, EPA guidance calls for closed-building conditions for at least 12 hours before the test and throughout the measurement. Windows stay closed, exterior doors open only for normal entry and exit, and the monitor logs hourly readings that help document the test conditions during the minimum 48-hour measurement.
Day 3
Pick-up and report
A technician picks the monitor up in another two-hour window and pulls the full record on the spot. The written report reaches you the same day.
NRSB-certified technicians. Our own team, certified by the National Radon Safety Board, not a subcontractor.
EPA testing guidance. Placement, closed-house conditions and the 48-hour minimum follow it, and your average is read against the EPA action level of 4.0 pCi/L.
Continuous monitors. Airthings Corentium Pro instruments, logging every hour for the whole test.
Appointment times are requests until our team confirms them. What the number means, how to prepare the property and the eight questions everyone asks are on the radon testing page; this page is about Annandale.
Fairfax County is assigned EPA radon Zone 1, yet the map is not designed to predict an Annandale home’s measurement. EPA recommends testing instead of relying on a zone designation for an individual property. During the appointment, the relevant layout is the lowest level that could be used regularly, even when its present finish or use differs from the main living floor. Explain any lower apartment, family room, future bedroom or restricted utility area so the technician can choose a representative location within the authorized scope.
The Fairfax County Annandale plan, amended through July 31, 2018, describes the district as primarily single-family detached housing with garden apartments, condominiums and townhouses in specified parts. That is district-level planning context, not a claim about every Annandale address. The varied housing types make unit boundaries and access worth resolving early: say whether the request concerns a detached house, one attached residence or one apartment, and identify who controls the lowest usable interior area.
Local background: Fairfax County Annandale plan overview, amended through July 31, 2018, Virginia Department of Health indoor radon map, EPA Map of Radon Zones guidance.
01
Tell the technician if a lower office, playroom or bedroom is planned after closing. This lets placement reflect a realistic regular-use level rather than only the seller’s current arrangement.
02
Complete vacuuming, painting and repair activity before setup, then maintain the preparation conditions for at least 48 hours. Leave adequate clearance around the monitor until collection.
03
If a tenant controls the lower area, obtain entry approval for placement and pickup in advance. Share any limited access hours so neither visit depends on an unplanned interruption.
Where we test in Annandale, and what to tell us
Ravenwood Park, Annandale Acres
In Ravenwood Park or Annandale Acres, discuss any lower recreation room or planned bedroom before the visit. Present-day furniture does not by itself answer which level could be used regularly.
Broyhill Crest, Canterbury Woods
For Broyhill Crest or Canterbury Woods, keep the selected room available across both technician visits. Storage boxes, renovation materials and pets should not obstruct the device location.
Sleepy Hollow Woods
Near Sleepy Hollow Woods, confirm whether an in-law area or rental space is inside the booked scope. Separate occupancy can change access and authorization even at one street address.
We do not install radon systems, so we have nothing to gain from your number. If the result is at or above the EPA action level of 4.0 pCi/L, you choose who fixes it. Once the system is in, we can test again and tell you what it reads.
Virginia's residential disclosure statute directs the seller's disclosure statement to say that the owner makes no representation about whether the property is in an EPA Zone 1 or Zone 2 locality. It directs buyers to use due diligence, including reviewing EPA, Virginia Department of Health and NRSB information and ordering a radon inspection before settlement as the contract allows.
Va. Code section 55.1-703. Current as of September 2026. General information, not legal advice.
It makes the exact residence and access boundary important. State whether the test is for a whole detached home, one townhouse, one condominium or one apartment, and identify any separately controlled lower space.
Describe every level that could be used regularly, including partially below-grade rooms, and explain their current and expected uses. The technician will choose placement after seeing the actual configuration.
Keep pets from contacting the monitor and from forcing exterior doors to remain open contrary to the instructions. Tell the team beforehand if the chosen area cannot be isolated safely.
Note the time, duration and nature of the event, such as cleaning near the device or a prolonged open door. Send that information to the technician without moving the equipment.
Book online or call (703) 450-6398.
Schedule a radon test Request a price
NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
