Is the Limestone Overlay District a concern for an Aldie pool project?

No. Aldie sits south and west of that karst-related overlay's boundary, so it doesn't reach the village, unlike parts of rural Loudoun closer to the Potomac.

Fiberglass Pool Installation in Aldie, VA

Aldie is a small, historic village in western Loudoun County — closer in character to Middleburg’s hunt country than to the suburban subdivisions of eastern Loudoun. It has no town government of its own, but the village core carries real zoning authority that a farmland parcel a mile away doesn’t. This page covers what’s specific to Aldie — separate from the county-wide rules on our Loudoun County page, which still apply underneath everything below.

Two historic overlays, not one

Loudoun County’s own zoning maps show Aldie carrying two separate, stacked overlay districts: a Historic and Cultural Conservation District and a Village Conservation Overlay District. The first is the one with real teeth for a homeowner — any new construction, addition, or accessory structure inside the district, and even a fence (farm fences excepted), needs a Certificate of Appropriateness from the county’s Historic District Review Committee before a building permit will issue. Some smaller projects qualify for staff-level administrative approval rather than a full committee hearing, but either way it’s a real step most homeowners outside a historic district never encounter. The district itself is compact — centered tightly on the historic village core around the Mill, not the farmland surrounding it — so whether it applies to your specific lot depends on exactly where your property sits relative to that boundary.

The Village Conservation Overlay is a separate, additional layer the county created specifically to protect the development pattern and visual character of small historic villages like Aldie. The county’s own guidance is direct on this point: whether a particular property falls inside it is something to confirm with the Zoning Administrator, not something to assume from a map. Between the two overlays, a pool project’s fence, pool house, or other visible structure inside the village is genuinely more likely to need a design review than the same project on an outlying parcel.

Fiberglass pool installed on a rural residential property with open surrounding land — Whether your lot sits inside the historic village core or out on the surrounding farmland changes which approvals a pool project needs.

The village itself is zoned differently than the land around it

Aldie’s built-up village core is zoned Countryside Residential — a village-scale designation distinct from the Agricultural Rural zoning that covers most of the farmland surrounding it. Countryside Residential lots run on private well and wastewater, same as the rest of rural Loudoun, but at village-scale density rather than the multi-acre minimums typical of the surrounding countryside. Setback and lot-coverage specifics vary by the exact subdistrict and can differ meaningfully from a standard rural parcel, so we’d recommend confirming your accessory-structure setback directly with Loudoun County’s Department of Planning and Zoning for your specific address rather than assuming a countywide number applies.

Well and septic, standard for the area

Like most of rural western Loudoun, Aldie-area properties run on private wells and onsite septic systems rather than public water and sewer, permitted through Loudoun County’s water well ordinance and a Virginia Department of Health sewage disposal permit for the septic system. Nothing about this is unique to Aldie specifically — it’s the same process as the rest of rural Loudoun — but it’s worth having your well and septic system (including the reserve drainfield area) mapped before you settle on a pool location, the same as anywhere else in the county’s rural west.

Floodplain along the Little River — real near the Mill, not a concern for most village lots

The Little River runs directly past the historic Aldie Mill, and Loudoun County’s own FEMA flood mapping shows an active Special Flood Hazard Area — Zone AE, with a base flood elevation study — along that stretch of the river. That’s a genuine consideration if your property backs onto the river near the mill. It is not, however, a blanket concern for the village: a typical residential lot a few hundred feet south of Route 50, away from the river itself, falls outside the mapped flood zone entirely. If you’re not sure which side of that line your property falls on, Loudoun County’s GIS flood layer or a FEMA flood determination will settle it before you plan a pool location near the back of a river-adjacent lot.

Conservation easements are common in this part of the county

Aldie sits in one of the more conservation-easement-dense parts of Loudoun County. Two notable examples anchor the village itself: the Old Aldie Rectory, built in 1803, carries a recorded conservation easement held by the Northern Virginia Conservation Trust, and the Piedmont Environmental Council separately owns a six-acre parcel in the village — the “Aldie Assemblage” — acquired specifically to keep new development consistent with the village’s historic character. Neither of those is a private residential example, but they illustrate how active easement-holding organizations are in this specific area. Before finalizing a pool site on an Aldie-area property, especially a larger or older parcel, it’s worth pulling your plat and title work to check for a recorded conservation easement of your own — a real possibility here that a suburban eastern-Loudoun buyer wouldn’t need to think about.

One rural-Loudoun rule that doesn’t apply here

If you’ve read our Loudoun County page, you’ll know rural western Loudoun carries a Limestone Overlay District tied to karst terrain and sinkhole risk. Aldie sits south and west of that overlay’s boundary — it doesn’t reach the village. That’s one less thing to plan around here than in the karst-affected parts of the county closer to the Potomac.

A pool counts as a structure under Aldie’s historic district rules

Loudoun County’s Historic District Review Committee must approve or deny a complete Certificate of Appropriateness application within 90 business days, or the application is deemed approved, unless the Board of Supervisors extends the period (Zoning Ordinance Section 10.12). The ordinance’s definition of “structure” names swimming pools. If your parcel is inside the district, Section 5.08 bars any structure or paved area, walkways included, until the certificate is issued. The certificate comes before the Zoning Permit, which comes before the building permit.

The Zoning Administrator can approve an accessory structure of 250 square feet or less without a committee hearing. Ask how the office measures a pool against that figure.
An approved certificate can carry a reduced yard or setback if the committee finds it fits the streetscape and the district’s guidelines, which are part of the ordinance.

The ordinance cites Virginia Code § 15.2-2306 as its authority for historic districts. The rules themselves are in the county’s online Zoning Ordinance.

Aldie’s rural zoning districts and the zoning permit file

Loudoun’s ordinance counts accessory structures, a pool included, toward lot coverage. In the legacy Countryside Residential table, the maximum runs from 15 percent in CR-1 (base option) to 40 percent in CR-2 and CR-3. Base-option rear yards are 50 feet in that table and 25 feet in the AR-1 and AR-2 farm districts.

Section 10.04 lets the office ask for a plot plan showing easements, conservation easements included, and wells and septic systems, plus a Health Official’s certificate that the location meets the county’s water and sewage ordinances.

What NRCS soil data shows under the village

In the Loudoun County survey (VA107), the largest map units along Route 50 through Aldie are Codorus, Myersville-Catoctin, Clapham and Middleburg soils.

Catoctin soils have hard bedrock at 20 to 40 inches. NRCS rates them very limited for shallow excavations.
Codorus soils are occasionally flooded and saturated at 10 to 15 inches from February through April.
Clapham soils have a cemented pan at 8 to 30 inches and saturation at 24 to 30 inches.

As practice, not code: rock or a seasonal water table inside the footprint changes the excavation, so know it before a shell is chosen. Check your parcel in Web Soil Survey.

Taking out an old pool in Aldie: historic review covers demolition

Loudoun County’s historic district FAQ says new construction in a historic district, including any alterations to or demolition of an existing structure, must be approved by the Historic District Review Committee. It lists Aldie among the six districts where the committee reviews all exterior construction, and its examples include demolition of existing structures or portions of existing structures. Some projects can be approved by staff without a committee hearing. Because the ordinance’s definition of a structure names swimming pools, as noted above, removing an old pool is a question to settle with the county before anything is scheduled. Ask the Department of Planning and Zoning at 703-777-0246 whether a pool removal needs a Certificate of Appropriateness and whether staff can approve it.

If the old pool is being replaced, the new one is new construction in the district and brings the certificate, zoning permit and building permit sequence described above, so it is worth asking about both at once. Our guides to partial vs full pool removal and how to verify a pool removal contractor cover the questions to bring, and our pool removal and replacement page explains how Calm Water Pools coordinates removal and replacement.

A sensible order of operations

Confirm whether your property falls inside the Historic and Cultural Conservation District or the Village Conservation Overlay by checking with Loudoun County’s Zoning Administrator — don’t assume from a map alone.
Confirm your exact zoning subdistrict and accessory-structure setback directly with the county’s Department of Planning and Zoning.
If your lot is near the Little River or the Mill, check current FEMA flood mapping before settling on a pool location.
Pull your plat and title work to check for a recorded conservation easement, particularly on a larger or older parcel.
Map your well, septic system, and reserve drainfield area before you finalize a pool site.
Then apply for your county building and zoning permit and choose a shell model that fits the envelope you’ve actually confirmed.

Doing it in that order costs nothing. Finding out about a historic-district review requirement after the excavator arrives is the expensive way to learn it.

What Calm Water Pools does in Aldie

We’re a family-owned fiberglass pool company based in Clarksburg, MD, working across Maryland, Washington D.C., Northern Virginia and the nearby West Virginia Eastern Panhandle. Here we offer full fiberglass pool installation, managing the project from shell selection through a finished pool and coordinating the build with licensed independent contractors; pool removal and replacement for aging concrete, vinyl-liner or damaged fiberglass pools; and fiberglass pool shells supplied on their own to homeowners, builders and contractors running their own installations. We also supply inground winter safety covers.

If you’re not sure how the historic overlays or a possible conservation easement affect your specific Aldie-area property, that’s worth a conversation before you’ve picked anything out. Call 240-372-4440 or request a free quote.

Zoning overlays, historic-district boundaries, floodplain maps and conservation easements are all specific to individual parcels and change over time. Everything above reflects our understanding of Loudoun County requirements at the time of writing and is general guidance, not a substitute for confirming the current rules for your specific property with Loudoun County’s Historic District Review Committee and Department of Planning and Zoning.