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R-5Residential (R-5), 5 DU/acre

Fairfax County, VA · Fairfax County Zoning Ordinance

R-5 allows single-family detached and attached dwellings at medium density. Max 5 DU/acre. Detached: min lot 5,000 sq ft, height 35ft. Front setback 20ft, side 8ft, rear 25ft. Other principal uses: min lot 14,000 sq ft, height 65ft (Table 2102.11). Common in older, established neighborhoods closer to urban centers.

Development standards in R-5

Front setback	Single-family detached: At least 20 ft “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
	Single-family attached: At least 5 ft “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
	Other principal uses: At least 20 ft for a building up to 35 ft tall, 21 ft up to 40 ft, 24 ft up to 45 ft, 27 ft up to 50 ft, 29 ft up to 55 ft, 32 ft up to 60 ft, 35 ft up to 65 ft; no figure above that height “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
Side setback	Single-family detached: At least 8 ft “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
	Single-family attached: At least 10 ft “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
	Other principal uses: At least 10 ft for a building up to 25 ft tall, 12 ft up to 30 ft, 14 ft up to 35 ft, 17 ft up to 40 ft, 19 ft up to 45 ft, 21 ft up to 50 ft, 24 ft up to 55 ft, 26 ft up to 60 ft, 28 ft up to 65 ft; no figure above that height “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
Rear setback	Single-family detached: At least 25 ft “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
	Single-family attached: At least 20 ft “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
	Other principal uses: At least 25 ft for a building up to 55 ft tall, 26 ft up to 60 ft, 28 ft up to 65 ft; no figure above that height “[1] Refer to subsection 5108.5 for provisions that may qualify the setback requirements. Refer to subsection 5100.2.D(1)(d) for provisions that qualify the setback requirements for individual units in single-family attached dwellings. Setback requirements may be waived by the Board in accordance with subsection 5100.2.D(1)(e).”	2102
Maximum height	Single-family detached: At most 35 ft	2102
	Single-family attached: At most 35 ft	2102
	Other principal uses: At most 65 ft	2102
Maximum FAR	Other principal uses, all uses other than residential: At most 0.35	2102
Maximum FAR	Single-family dwellings: No requirement	2102
Max density	Single-family detached: At most 5 dwellings per acre	2102
Max density	Single-family attached: At most 5 dwellings per acre	2102
Minimum lot size	Single-family detached: At least 5,000 sq ft	2102
	Other principal uses: At least 14,000 sq ft	2102
	Single-family attached: No requirement	2102
Minimum lot width	Single-family detached, interior lot: At least 50 ft “[2] District size and lot width may be modified in accordance with subsections 5100.2.K.”	2102
	Single-family detached, corner lot: At least 70 ft “[2] District size and lot width may be modified in accordance with subsections 5100.2.K.”	2102
	Single-family attached: At least 18 ft “[2] District size and lot width may be modified in accordance with subsections 5100.2.K.”	2102
	Other principal uses, interior lot: At least 75 ft “[2] District size and lot width may be modified in accordance with subsections 5100.2.K.”	2102
	Other principal uses, corner lot: At least 100 ft “[2] District size and lot width may be modified in accordance with subsections 5100.2.K.”	2102
Minimum open space	At least 25% “[3] Open space is calculated in accordance with subsection 5100.3.A(3).” “Open space, minimum [3] 25 percent of the gross area”	2102

Each row above is the ordinance’s own rule, written out in words and cited to its section. Where a figure depends on what you build (the kind of building, a conventional or cluster subdivision, an interior or corner lot, or the building’s height), each case is its own line; where it depends on the building height, the cited table says how that height is measured. An affordable dwelling unit development has its own table with different figures; see 2102.

Read from Fairfax County Zoning Ordinance, effective through 2026-07-01. We last checked with the publisher on 2026-09-14 and found nothing newer -- a check on that date, not a promise about today.

How complete is this market? Across 239,083 parcels we answer 96.1% of the 6 questions this site is built to answer, each with a source you can check. The rest are shown as “not recorded” rather than filled in — we would rather be short than wrong. A further 13,550 properties inside the county line are zoned by an incorporated town with its own ordinance, not by the county, so this county ordinance does not govern them and they are not counted above or below — which is why we publish this market as Fairfax County (excl. Vienna and Herndon). Look one of those up and we will tell you which town governs it.

Permitted uses in R-5

AllowedSingle-Family Residential
Table 4101.1 lists “Dwelling, Single-Family Detached” as P in the R-5 column. P = permitted by right; SE = special exception; SP = special permit; A = accessory only; AP = administrative permit (Table 4101.1).
DependsAccessory Dwelling Units Varies
Depends: administrative permit, only if the use is a type or location that Sec. 4102.7.B allows here and the use stays within the limits in Sec. 4102.7.B; special permit, only if the use is a type or location that Sec. 4102.7.B allows here and the use stays within the limits in Sec. 4102.7.B; this table cell allows the use in more than one way (administrative permit or special permit), and the use standards in Sec. 4102.7.B set which way applies
Table 4101.1 lists “Accessory Living Unit” as AP/SP in the R-5 column. P = permitted by right; SE = special exception; SP = special permit; A = accessory only; AP = administrative permit (Table 4101.1).
DependsHome Occupation Varies
Depends: administrative permit, only if the use is a type or location that Sec. 4102.7.H allows here and the use stays within the limits in Sec. 4102.7.H; special permit, only if the use is a type or location that Sec. 4102.7.H allows here and the use stays within the limits in Sec. 4102.7.H; this table cell allows the use in more than one way (administrative permit or special permit), and the use standards in Sec. 4102.7.H set which way applies
Table 4101.1 lists “Home-Based Business” as AP/SP in the R-5 column. P = permitted by right; SE = special exception; SP = special permit; A = accessory only; AP = administrative permit (Table 4101.1).
DependsSTR - Short-Term Rentals Varies
Depends: administrative permit, only if the use is a type or location that Sec. 4102.7.O allows here and the use stays within the limits in Sec. 4102.7.O
Table 4101.1 lists “Short-Term Lodging” as AP in the R-5 column. P = permitted by right; SE = special exception; SP = special permit; A = accessory only; AP = administrative permit (Table 4101.1). Fairfax defines this as a room or space intended for TRANSIENT OCCUPANCY for a charge, and expressly NOT a bed and breakfast, hotel, motel or accessory living unit (Article 9). It needs a short-term lodging permit from the Zoning Administrator, and the operator must be a permanent resident of the property (Sec. 4102.7.O).
Not AllowedCommercial / Retail
Table 4101.1 has no entry for “Retail Sales, General” in the R-5 column. The table's own legend: a blank cell indicates the use cannot be established in that zoning district (Table 4101.1).
Not AllowedMulti-Family Residential
Table 4101.1 has no entry for “Dwelling, Multifamily” in the R-5 column. The table's own legend: a blank cell indicates the use cannot be established in that zoning district (Table 4101.1).

"Conditional" means the use generally requires a public hearing or special-exception approval — a very different timeline and risk profile from a by-right permit.

This is the zone. What about the parcel?

Zone rules are the starting point — the answer for a specific property also depends on lot size, overlays, existing improvements and site conditions. Run a free address lookup to see what applies to one property.

Look up an address

Sources

Fairfax County Zoning Ordinance — read the ordinance
Fairfax County — official zoning map / authority
Standards as recorded by Zonescore: Fairfax County Zoning Ordinance (enCodePlus, current)

Values are read from the Fairfax County Zoning Ordinance.

Other Fairfax County zones

C-1 C-2 C-3 C-4 C-5 C-6 C-7 C-8 I-2 I-3 I-4 I-5 I-6 I-I PCC PDC PDH PDH-1 PDH-12 PDH-16 PDH-2 PDH-20 PDH-3 PDH-30 PDH-4 PDH-40 PDH-5 PDH-8 PRC PRM PTC R-1 R-12 R-16 R-2 R-20 R-3 R-30 R-4 R-8 R-A R-C R-E R-MHP