South Riding Homes Compared With Loudoun County
South Riding sits in Loudoun County, Virginia. The table shows how its housing differs from the county as a whole, which decides what a duct and dryer vent visit checks first.
| Measure | South Riding | Loudoun County |
|---|---|---|
| Median year built | 2006 | 2002 |
| Built in 2000 or later | 77% | 57% |
| Detached houses | 49% | 51% |
| Townhomes | 46% | 31% |
| Heat with natural gas | 81% | 59% |
| Owner-occupied | 83% | 78% |
Source: U.S. Census Bureau, American Community Survey 2024 5-year estimates. Figures are estimates and are rounded.
A Chantilly Address in Loudoun County
South Riding shares the Chantilly mailing name and ZIP codes 20151 and 20152 with the Chantilly area in Fairfax County. The homes, though, are in Loudoun County, south of Route 50 and west of the county line. The South Riding homeowner association, South Riding Proprietary, dates to January 1995.
When you ask for an estimate, say South Riding rather than Chantilly. Chantilly's homes are mostly 1980s houses in Fairfax County with different needs; the Chantilly page covers those.
Gas Furnaces Reaching Twenty Years
Eight in ten South Riding homes heat with natural gas, compared with 59 percent across Loudoun County. Furnaces installed with homes from the early 2000s are now about 20 years old. The EPA advises having fuel-burning furnaces inspected and serviced before each heating season, and the Consumer Product Safety Commission advises carbon monoxide alarms on every level of the home.
When a furnace is replaced, the ducts usually stay. That is a good time for a duct inspection; the furnace duct cleaning page covers what to check during the swap.
Townhome Dryer Vents
Townhomes make up 46 percent of South Riding's housing, compared with 31 percent across Loudoun County. Upper-floor laundry rooms in townhomes often send the exhaust through a long run to a side wall or the roof. Virginia's residential code limits a dryer exhaust run to 35 feet, minus an allowance for each elbow.
| Vent route | Where it lands in the $135 to $360 range |
|---|---|
| Short run through a first-floor wall | Low end |
| Long run from an upper-floor laundry | Middle |
| Roof termination | Upper end, for ladder access |
The townhome and HOA vent page covers who pays for exterior hoods in an association.
South Riding Duct and Dryer Vent FAQs
Is South Riding in Loudoun County or Fairfax County?
South Riding is in Loudoun County. Its homes use Chantilly mailing addresses and ZIP codes 20151 and 20152, which it shares with the Chantilly area in Fairfax County, but the county line forms South Riding's eastern border.
How much does air duct cleaning cost in South Riding?
Whole-system cleaning runs about $500 to $800 per system. Townhomes usually run $190 to $650, and dryer vent cleaning runs $135 to $360, with roof vents at the upper end.
Does a 20-year-old furnace need duct cleaning?
Not automatically. A furnace that age needs yearly service and carbon monoxide alarms on every level. Duct cleaning helps when an inspection shows heavy dust, debris, pests or mold.
Who cleans the dryer vent hood on a South Riding townhome?
The owner usually handles the vent line inside the home. Responsibility for an exterior hood depends on the association's documents, so check them before booking.