Crawl Space Encapsulation in Henrico County, VA (2026)
Two in three Richmond-area homes sit over a crawl space (AHS 2021), an even higher share than the Raleigh metro.
Henrico County spells out what an encapsulation must include. The county lists crawlspace encapsulation among projects that need a building permit.
Its unvented crawl space detail asks for a Class I vapor retarder run at least 6 in up the wall, R-10 wall insulation and R-15 at the rim. If you dry the space with a dehumidifier, it must remove 70 pints a day per 1,000 sq ft.
Permits
Henrico Department of Building Construction and Inspections, 4301 East Parham Road; Permit Center (804) 501-7280.
Submit: a foundation wall section showing insulation type, thickness, R-value and vapor retarder; foam manufacturers' evaluation reports; for the dehumidifier method, a crawl space floor plan with the unit and drain location, plus the unit's spec sheet.
Sump pumps also require a permit in Henrico.
Local conditions
More than half the county's soil acreage (51.7%) has a shallow seasonal water table.
30.5% is in map units rated for occasional or frequent flooding, the highest of the six markets. These are soil ratings, not FEMA zones.
The county rates termite damage 'Moderate to Heavy' and requires a termite inspection gap under the sill plate (1 to 2 in).
What drives local prices
- Dehumidifier sized to the county's 70-pint rule (a 1,500 sq ft space needs 105 pints/day)
- R-10 wall and R-15 rim insulation
- Permit drawings and foam evaluation reports
Common jobs
- Full encapsulation to Henrico's 70-pint dehumidifier specification
- R-10 wall and R-15 rim insulation per county requirements
- Sump pump installation (permit required)
- Termite inspection gap compliance
Service area
Coverage across Glen Allen, Short Pump, Tuckahoe, Lakeside, Highland Springs, and the county.
Henrico Department of Building Construction and Inspections handles permits; crawlspace encapsulation is listed as requiring a permit.
Communities: Glen Allen, Short Pump, Tuckahoe, Lakeside, Highland Springs, Sandston, Varina, Montrose, Laurel, Innsbrook, Dumbarton, Wyndham
If it is an emergency
If water is standing after a storm, have it pumped and the source found before any liner is installed. Henrico requires a permit for sump pumps.
Questions about Henrico County
Does Henrico County require a permit to encapsulate a crawl space?
Yes. The county's permit page lists crawlspace encapsulation among improvements that need a permit, and sump pumps need one too.
How big a dehumidifier does Henrico require?
If the dehumidifier method is used, the county's detail says it must remove 70 pints of moisture per day for every 1,000 sq ft of crawl space floor. Submit the manufacturer's spec sheet with the permit.
Sources
- HN1: Richmond Intl (USW00013740) normal annual precipitation 45.50 in; Jun–Aug 13.91 in
- HN2: RIC July mean dew point 67.9°F; 30.9% of normal hours ≥60°F
- HN3: RIC averages 73.5 days/yr ≤32°F and 44.9 days ≥90°F
- HN4: 51.7% of soil acreage (80,587 of 155,900 ac) has a minimum annual water table ≤100 cm; 16.0% hydric
- HN5: 30.5% (47,614 ac) is rated for occasional or frequent flooding
- HN6: 357 NFIP claims, $4.20 million paid; 68 since 2016
- HN7: County permit list includes 'Crawlspace encapsulation' and sump pumps
- HN8: County unvented-crawl detail: dehumidifier must remove 70 pints/day per 1,000 sq ft; R-10 walls, R-15 rim; Class I retarder ≥6 in up the wall
- HN9: Termite damage 'Moderate to Heavy'; frost line 18 in; mean annual temperature 57.7°F (county design criteria)
- HN10: Termite inspection gap below the sill plate, min 1 in / max 2 in (county detail)
Fees and rules change; confirm with the permitting office. Run the estimator for a cost range.