What is lot yield?
Lot yield is the number of lots a tract can actually deliver. It has two ceilings: the paper count that a locality's minimum lot sizes, frontage and density rules allow, and the count that survives once every lot without public sewer proves its own approved sewage site and a way to a road. The second count is never larger than the first.
The count an ordinance permits, and the count the soil lets through
A tract's lot count comes in two versions. The first is the number a county's minimum lot sizes, frontage rules and density limits would allow on a map. The second is the number still standing once each of those lots, one at a time, has shown an approvable place for its sewage system.
The first count comes from local rules. Any Virginia locality may regulate the building of houses by ordinance, including minimum setbacks, side yards and minimum lot sizes, and a zoning ordinance may vary lot sizes by whether public or community water or sewer is available and used. That is arithmetic on a map.
The second count comes from the ground. Every residence has to be served by an approved sewerage system. 12VAC5-610-360 governs plat review "when required by local ordinance", and in that review "No department employee shall sign or indicate approval for onsite sewage disposal systems on a subdivision plat" until a sewage disposal site, including any required reserve area, has been identified, approved or disapproved and recorded on each lot of the plat on file with the health department. A paper lot with no approvable drainfield site does not survive into the second count.
Even the signed plat is not the last word. The health department's signature does not imply that any lot shown as approved will be issued a sewage disposal construction permit "unless all conditions and circumstances, such as but not limited to landscaping, contained in the original approval exist at the time of application for a sewage disposal construction permit." Ground that is regraded or built over after approval can lose what it had.
Lot minimums, flag-lot caps and density scales, county by county
The paper count differs across the footprint because the rules do. None of these figures carries across a county line, and none of them is a count for a real tract.
| County | What limits the count on paper |
|---|---|
| Carroll | Residential lots of 0.75 acre and 100 feet of average width with neither public water nor sewer, 17,500 square feet with one, 15,000 square feet with both; the Administrator may require larger lots on the health officer's recommendations. At most three flag lots, or up to 30 percent of the lots where a tract over ten acres is divided into ten or more, each at least 1.5 acres. Class B subdivisions (for non-primary recreational dwellings) need lots of at least 2.5 acres; Class C subdivisions, allowed only on parcels recorded before January 1, 2014 that lack the road frontage or acreage for Class A or B, allow at most five lots of at least 1.5 acres; neither may be resubdivided. |
| Pulaski | Residential district: 0.25 acre with public water and sewer, 0.5 acre with one, 0.75 acre with private well and septic. Agricultural district: 1-acre minimum lot. |
| Floyd | Standard Division: 2 acres with 100 feet of road frontage and no public water or wastewater, down to 0.25 acre and 50 feet with both. Large Lot Division: 25-acre lots, apart from one Limited Access Lot per plat. |
| Montgomery (A-1 district only) | A sliding scale of lots per parent parcel, for example up to 3 lots on 3 to 10 acres and up to 4 on more than 10 up to 30, subject to water and wastewater rules that may lower it. |
| Wythe | The comprehensive plan's summary of the 2012 subdivision ordinance: minimum lots of 10,000 to 25,000 square feet depending on public utilities. |
Two things in that table shape the paper count more than a quick reading suggests. Road frontage minimums, like Floyd's, mean a long narrow tract on a short stretch of road can hold fewer standard lots than its acreage implies. And caps on shape, like Carroll's limit on flag lots, keep the back of a deep tract from being reached by one narrow strip after another. How a flag lot is defined and capped in each county is its own answer.
Floyd's comprehensive plan adds a point that cuts the other way: a subdivision ordinance cannot limit the number of parcels created from a parent tract as long as each new parcel meets the standard. In Floyd, as the plan describes it, the paper ceiling is set by the lot standard itself rather than by a separate limit on the number of parcels.
Every lot proves a sewage site and a way out, and that is where paper lots drop away
Where no public sewer reaches, the second count is decided lot by lot, never acre by acre.
Carroll County's subdivision ordinance puts the burden on each lot: developers use an onsite soil evaluator for each lot's soil work, and drainfields need a reserve area on which no structure may be built. A lot big enough on paper can still fail to fit a house, a well, a drainfield and its reserve in places the soil accepts. Why that reserve takes the ground it does is explained in what a septic reserve area is, and the term is defined under septic reserve area in the glossary.
Montgomery's own density scale says the same thing in its text: its lot counts are subject to the regulations for onsite water supply and wastewater treatment, which may limit the number of lots permitted. Ground without public sewer is not undevelopable; the choices for serving several dwellings without it are laid out in developing land with no public sewer.
Access trims the count too. Every lot needs a way to a road, and a new street built to reach them takes ground of its own. Whether the state will ever maintain that street is a separate test: one public service test for VDOT accepting a new street is that it serves three or more occupied units. In Carroll County, streets in Class B and Class C subdivisions are not built to VDOT standards or maintained by VDOT or public funds; the developer or a homeowners association maintains them.
No formula turns acres into lots; three people put a number on a real tract
There is no lots-per-acre figure that holds across this part of Virginia, and any number quoted without the soil work behind it is the paper count wearing the ground count's name.
| What has to be known | Who knows it |
|---|---|
| Where the lot lines, road and frontage can actually fall | A land surveyor, working from the recorded boundary |
| Which lots hold an approvable sewage site and reserve | A licensed onsite soil evaluator, then the health department |
| Which lot rules apply and whether the layout meets them | The county subdivision agent |
Lot yield is the number a land development feasibility read arrives at once its subtractions from gross acres are done. The approval path the lots then follow, from the first plat submission to recording, is set out in how to subdivide land in Virginia.
Wondering how many lots your tract could realistically hold?
Send the parcel, the acreage and the road it fronts. Lowell will read the soil, grade and access against the county's lot rules, while the count itself waits on a surveyor, a soil evaluator and the county. No cost, no obligation.
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Questions this raises
Is lot yield the same thing as density?
Not quite. Density is a cap a rule sets; Montgomery County's A-1 district, for instance, defines its maximum gross density as the total number of lots per parent parcel after subdividing and sets it on a sliding scale. Lot yield is what a particular tract delivers under that cap and every other rule, including the lot-by-lot sewage review, so it can come in below the density allowed and never above it.
Does public sewer raise the lot count on a tract?
It changes both ceilings. On paper, the counties that scale lot size by utilities allow smaller lots with public water and sewer: Carroll drops from 0.75 acre to 15,000 square feet, and Pulaski's Residential district from 0.75 acre to 0.25 acre. On the ground, lots on sewer do not each need an onsite sewage site. In Pulaski a new lot within 300 feet of an existing water or sewer main must connect. Whether a line can serve a tract is the utility's answer.
Where this page's facts come from
Every rule, office and figure above traces to one of these. Rules change; check the office before you act on one.
- Va. Code 15.2-2279, minimum setbacks and lot sizes by ordinance Virginia General Assembly
- Va. Code 15.2-2280, what a zoning ordinance may regulate Virginia General Assembly
- 12VAC5-610-360, review of subdivision plats for individual sewage disposal systems Virginia Administrative Code
- 12VAC5-610-80, approved sewerage system required Virginia Administrative Code
- 24VAC30-92-60, public service requirements for street acceptance Virginia Administrative Code
- Subdivision Ordinance (posted text amended through April 14, 2014) Carroll County, Virginia
- Unified Development Ordinance (amended July 27, 2025) Pulaski County, Virginia
- Land Division Ordinance (effective January 1, 2026) Floyd County, Virginia
- Comprehensive Plan Floyd County, Virginia
- Zoning Ordinance, Sec. 10-21, A-1 Agricultural District Montgomery County, Virginia
- Comprehensive Plan Wythe County, Virginia