13 Additional Requirements for Subdivisions
Subdivision
design shall be sensitive to the protection and preservation of existing site features, natural and man-made. To the maximum extent possible, subdivisions
shall be designed to preserve structures and sites of historic or cultural significance, small family
cemeteries
, and to protect habitats of rare or unusual plants or wildlife as documented in the established Durham Inventory
, the State Natural Heritage Listing, or the National Register of Historic Places.
Subdivision
of land shall comply with adopted public plans for the area in which it is located. This includes plans for public facilities
such as rights-of-way, parks and open space
, schools, and other similar facilities.
The name of a subdivision
shall not duplicate nor closely approximate the name of an existing subdivision
within the City or County.
For any subdivision
proposing to use on-site wastewater disposal
, the minimum lot size shall be one acre.
13.8.1. Subdivisions
shall not receive final plat
approval until the applicant furnishes an attorney's certification that proper legal provisions have been made for the following, as applicable:
A. Establishment of property owners
association;
B. Declaration of covenants and restrictions for common areas;
C. Declaration of unit-ownership development
; and
D. Provisions for perpetual ownership and maintenance of commonly-owned streets, utilities, other improvements, and lands.
13.8.2. All final plats
containing private streets and roads
shall contain a note requiring a disclosure statement to be furnished to all subsequent purchasers of property shown on the plat
.
A. Except in Design Districts, block
standards shall comply with this section or shall comply with Sec. 13.6, Street Connectivity Standards.
B. For Design District requirements see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
A. Streets shall be laid out such that the requirements can be met both within and between proposed and future subdivisions
on adjacent
land through the use of stub out
requirements within Sec. 12.3, Streets.
| Table 1: Block | |||
|---|---|---|---|
Zoning Districts | Maximum Block | Maximum Block Perimeter | Minimum Site Acre Applicable (acres) |
RU-M, RC (20 max); RS-M(D) (18 max); PDR (above 8.000); CSD; MU; CD; DD; CI; CN | 550 | 1,400 | 2 |
RU-5 (8 max); RS-M (8 max); RS-8 (5 max); PDR (below 8); OI; CG; CC | 920 | 2,880 | 5 |
RR; RS-20 (2 max); RS- 10 (4 max); I; IL; IP; SRP; UC | 1,200 | 4,000 | 10 |
Commentary: The maximum block
perimeters correspond to a maximum average block
length of 350 ft, 720 ft, and 1,000 ft.
B. Within a single phase of any subdivision
or development
, individual block
perimeters shall be permitted to exceed the maximum by 25% provided that the average of all block
perimeters in the phase does not exceed the maximum.
C. The requirements contained in Table 1 shall not apply if at least one of the following conditions prevents a through connection:
1. Obstacles associated with prior platting
of property from another landowner;
2. Construction of existing buildings or other barriers;
3. Railroad or utility right-of-way
; or
4. Existing limited-access motor vehicle
right-of-way
.
Every buildable lot shall abut a public street, a private street, or a driveway
allowed for access under paragraph 12.2.2B.2.b above, capable of providing access to a lot.
Side lot lines shall intersect rights-of-way between 60 and 90 degrees on a straight street, or from the tangent of a curved street.
A. For a residential lot that has frontage on two nonintersecting local or collector streets, the following shall apply:
1. For a lot with a single-family
structure
, the lot shall be accessed from one street only with treatment such as a berm, walls, or landscaping fronting on the second street to preclude access. This shall not apply for access to an accessory dwelling unit
.
2. For a lot with an accessory dwelling unit
, two-family
structure
, or multifamily
structure
, the lot can be accessed from both streets as long as access points are offset to inhibit cut-through traffic.
B. Residential lots adjacent
to a boulevard
or major/minor thoroughfare shall have vehicular access from the local street
only.
C. Nonresidential lots with double frontage shall have offset access points to inhibit cut-through traffic.
The subdivision
or resubdivision of a tract
or lot shall not be permitted to cause an existing structure
proposed for preservation to violate
the standards of this Ordinance.
All lots shall be numbered consecutively within each block
. Lot numbering can be cumulative throughout the subdivision
if the numbering continues from block
to block
in a uniform manner. Any lots being resubdivided shall be consecutively numbered beginning with the last available number in the existing block
or subdivision
.
A. Except in Design Districts, Block
standards shall comply with Sec. 13.4 or shall comply with Sec. 13.6, Street Connectivity Standards.
B. For Design District requirements see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
A. Except in Design Districts, connectivity shall be defined by the ratio of links to nodes in any subdivision
.
1. The connectivity ratio shall be the number of street links divided by the number of nodes (Links/Nodes).
2. A link shall be any portion of a street, other than an alley
, defined by a node at either end. Stub-outs to adjacent
property shall be considered links. For the purpose of determining the number of links in a development
, boulevards, median-divided roadways, and divided entrances shall be treated the same as conventional two-way roadways.
a. Any portion of a street, connected by a node at either end, including sidewalks and pedestrian connections in accordance with Sec. 12.4, Stub Outs
, to adjacent
property, transit stops, and streets including sidewalks per paragraph 12.4.2.
b. For the purpose of determining the number of links in a development
, boulevards, median-divided roadways, and divided entrances shall be treated the same as conventional two-way roadways.
Table 1. Connectivity Ratio Link Scoring Matrix | |
|---|---|
Type of Link | Connectivity Ratio Score (0.5-2) |
Street (including required sidewalks per paragraph 12.4.2) | 1: Street with required sidewalks per paragraph 12.4.2 |
2: Streets with sidewalk and exclusive on-road bicycle facilities | |
0.5 | |
Transit Stop (score received with the development | 2: Construction of a new transit stop with ADA accessible design and pedestrian connection within 15 feet; or ADA accessible improvements and pedestrian connection within 15 feet to an existing transit stop 500 feet or less from the subject site. |
Additional Pedestrian Connections (in accordance with UDO paragraph 12.4.3C) within the development | 2: All-weather pedestrian pathway of solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code with a minimum of 8-foot width. Additional lighting features as described in Sec. 7.4, Outdoor Lighting.
1.5: Less than 8-foot width pedestrian pathway constructed from a naturally occurring or loose material such as mulch or gravel. |
Bicycle Connections | 1.5: Off-road bicycle facility as described in Sec. 12.4, Pedestrian and Bicycle Mobility. |
Commentary: The different types of links and nodes have been weighted and scored differently based on how the specific infrastructure adds to connectivity and how it contributes to the ratio scoring matrix. A higher scoring link equates to a more desirable link, while a higher scoring node equates to a less desirable node.
3. A node shall be:
a. The terminus of a street or the intersection of two or more streets. A divided entrance shall only count once.
Table 2. Connectivity Ratio Node | |
|---|---|
Type of Node | Score |
Four-Way Intersection | 1 |
Three-Way Intersection | 1.25 |
1.5 | |
Figure 1. Types of Nodes

A (publicly accessible) pedestrian link shall be required between a neighborhood link or node including cul-de-sac
bulb or street turnaround, within 500 ft or less of the next closest connection to an adjacent
pedestrian connection and/or to significant pedestrian generators or destinations such as schools, parks, trails, employment centers, commercial areas, residential neighborhoods, or similar features.
Required pedestrian links shall be constructed from all-weather solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code and comply with the most recent accessibility standards as published under the Americans with Disabilities Act (ADA).
The requirements contained in Table 1 shall not apply if at least one of the following conditions prevents a through connection:
Obstacles associated with prior platting
of property from another landowner;
Construction of existing buildings or other barriers;
Railroad or utility right-of-way
; or
Existing limited-access motor vehicle
right-of-way
.
In addition to meeting all the requirements of paragraph 13.6.1C, Pedestrian Links Required, pedestrian links shall be provided between compatible uses such as civic, institutional, commercial, and residential uses.
For Design Districts, see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
The street network
, including common access driveways
permitted in paragraph 12.2.2B.2.b, Driveways
, for any subdivision
with internal roads
or access to any public road
shall achieve a minimum connectivity ratio of 1.15 in the Rural Tier, 1.40 in the Suburban Tier, 1.60 in the Urban and Compact Tier.
B. Street links and nodes along a collector or arterial street providing access to a proposed subdivision
shall not be considered in computing the connectivity ratio.
C. Required stub-outs that cannot be constructed pursuant to paragraph 12.3.1F, Stub Outs
, shall be considered as being present as a link at the ratio of one link per side as provided in paragraph 12.3.1F, Stub Outs
, for purposes of determining if the required ratio has been met.
Figure 2. Connectivity Ratio Example

A. Phasing plans shall be included in the first submittal and shall be reviewed and evaluated as part of the overall development
.
1. Off-site improvements are excluded from phasing; however, they may be required within a certain phase to satisfy overall development
requirements.
2. Phases shall be designed to ensure the efficient construction of future phases. Each phase of a development
shall be designed and function with the utilities, fire protection, right-of-way
infrastructure, and stormwater
management necessary to serve that phase.
3. Each phase shall contain the minimum tree coverage percentage as required per Sec. 8.3, Tree Protection and Tree Coverage.
4. Lot numbers shall not be duplicated within different phases of the same subdivision
.
B. All right-of-way
and/or easements
for public infrastructure servicing the respective phase must be recorded with the first plat
.
C. Water and sewer extension permit applications for each individual phase of the project are required after plan approval.
D. No land disturbing activity
in a subsequent phase shall commence until:
1. The first asphalt layer of the street or other vehicular system of the previous phase has been laid and inspected; and
2. The lot(s) in the previous phase have been stabilized, inspected, and approved per the County and State Sedimentation
and Erosion
Control standards.
13 Additional Requirements for Subdivisions
Subdivision
design shall be sensitive to the protection and preservation of existing site features, natural and man-made. To the maximum extent possible, subdivisions
shall be designed to preserve structures and sites of historic or cultural significance, small family
cemeteries
, and to protect habitats of rare or unusual plants or wildlife as documented in the established Durham Inventory
, the State Natural Heritage Listing, or the National Register of Historic Places.
Subdivision
of land shall comply with adopted public plans for the area in which it is located. This includes plans for public facilities
such as rights-of-way, parks and open space
, schools, and other similar facilities.
The name of a subdivision
shall not duplicate nor closely approximate the name of an existing subdivision
within the City or County.
For any subdivision
proposing to use on-site wastewater disposal
, the minimum lot size shall be one acre.
13.8.1. Subdivisions
shall not receive final plat
approval until the applicant furnishes an attorney's certification that proper legal provisions have been made for the following, as applicable:
A. Establishment of property owners
association;
B. Declaration of covenants and restrictions for common areas;
C. Declaration of unit-ownership development
; and
D. Provisions for perpetual ownership and maintenance of commonly-owned streets, utilities, other improvements, and lands.
13.8.2. All final plats
containing private streets and roads
shall contain a note requiring a disclosure statement to be furnished to all subsequent purchasers of property shown on the plat
.
A. Except in Design Districts, block
standards shall comply with this section or shall comply with Sec. 13.6, Street Connectivity Standards.
B. For Design District requirements see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
A. Streets shall be laid out such that the requirements can be met both within and between proposed and future subdivisions
on adjacent
land through the use of stub out
requirements within Sec. 12.3, Streets.
| Table 1: Block | |||
|---|---|---|---|
Zoning Districts | Maximum Block | Maximum Block Perimeter | Minimum Site Acre Applicable (acres) |
RU-M, RC (20 max); RS-M(D) (18 max); PDR (above 8.000); CSD; MU; CD; DD; CI; CN | 550 | 1,400 | 2 |
RU-5 (8 max); RS-M (8 max); RS-8 (5 max); PDR (below 8); OI; CG; CC | 920 | 2,880 | 5 |
RR; RS-20 (2 max); RS- 10 (4 max); I; IL; IP; SRP; UC | 1,200 | 4,000 | 10 |
Commentary: The maximum block
perimeters correspond to a maximum average block
length of 350 ft, 720 ft, and 1,000 ft.
B. Within a single phase of any subdivision
or development
, individual block
perimeters shall be permitted to exceed the maximum by 25% provided that the average of all block
perimeters in the phase does not exceed the maximum.
C. The requirements contained in Table 1 shall not apply if at least one of the following conditions prevents a through connection:
1. Obstacles associated with prior platting
of property from another landowner;
2. Construction of existing buildings or other barriers;
3. Railroad or utility right-of-way
; or
4. Existing limited-access motor vehicle
right-of-way
.
Every buildable lot shall abut a public street, a private street, or a driveway
allowed for access under paragraph 12.2.2B.2.b above, capable of providing access to a lot.
Side lot lines shall intersect rights-of-way between 60 and 90 degrees on a straight street, or from the tangent of a curved street.
A. For a residential lot that has frontage on two nonintersecting local or collector streets, the following shall apply:
1. For a lot with a single-family
structure
, the lot shall be accessed from one street only with treatment such as a berm, walls, or landscaping fronting on the second street to preclude access. This shall not apply for access to an accessory dwelling unit
.
2. For a lot with an accessory dwelling unit
, two-family
structure
, or multifamily
structure
, the lot can be accessed from both streets as long as access points are offset to inhibit cut-through traffic.
B. Residential lots adjacent
to a boulevard
or major/minor thoroughfare shall have vehicular access from the local street
only.
C. Nonresidential lots with double frontage shall have offset access points to inhibit cut-through traffic.
The subdivision
or resubdivision of a tract
or lot shall not be permitted to cause an existing structure
proposed for preservation to violate
the standards of this Ordinance.
All lots shall be numbered consecutively within each block
. Lot numbering can be cumulative throughout the subdivision
if the numbering continues from block
to block
in a uniform manner. Any lots being resubdivided shall be consecutively numbered beginning with the last available number in the existing block
or subdivision
.
A. Except in Design Districts, Block
standards shall comply with Sec. 13.4 or shall comply with Sec. 13.6, Street Connectivity Standards.
B. For Design District requirements see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
A. Except in Design Districts, connectivity shall be defined by the ratio of links to nodes in any subdivision
.
1. The connectivity ratio shall be the number of street links divided by the number of nodes (Links/Nodes).
2. A link shall be any portion of a street, other than an alley
, defined by a node at either end. Stub-outs to adjacent
property shall be considered links. For the purpose of determining the number of links in a development
, boulevards, median-divided roadways, and divided entrances shall be treated the same as conventional two-way roadways.
a. Any portion of a street, connected by a node at either end, including sidewalks and pedestrian connections in accordance with Sec. 12.4, Stub Outs
, to adjacent
property, transit stops, and streets including sidewalks per paragraph 12.4.2.
b. For the purpose of determining the number of links in a development
, boulevards, median-divided roadways, and divided entrances shall be treated the same as conventional two-way roadways.
Table 1. Connectivity Ratio Link Scoring Matrix | |
|---|---|
Type of Link | Connectivity Ratio Score (0.5-2) |
Street (including required sidewalks per paragraph 12.4.2) | 1: Street with required sidewalks per paragraph 12.4.2 |
2: Streets with sidewalk and exclusive on-road bicycle facilities | |
0.5 | |
Transit Stop (score received with the development | 2: Construction of a new transit stop with ADA accessible design and pedestrian connection within 15 feet; or ADA accessible improvements and pedestrian connection within 15 feet to an existing transit stop 500 feet or less from the subject site. |
Additional Pedestrian Connections (in accordance with UDO paragraph 12.4.3C) within the development | 2: All-weather pedestrian pathway of solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code with a minimum of 8-foot width. Additional lighting features as described in Sec. 7.4, Outdoor Lighting.
1.5: Less than 8-foot width pedestrian pathway constructed from a naturally occurring or loose material such as mulch or gravel. |
Bicycle Connections | 1.5: Off-road bicycle facility as described in Sec. 12.4, Pedestrian and Bicycle Mobility. |
Commentary: The different types of links and nodes have been weighted and scored differently based on how the specific infrastructure adds to connectivity and how it contributes to the ratio scoring matrix. A higher scoring link equates to a more desirable link, while a higher scoring node equates to a less desirable node.
3. A node shall be:
a. The terminus of a street or the intersection of two or more streets. A divided entrance shall only count once.
Table 2. Connectivity Ratio Node | |
|---|---|
Type of Node | Score |
Four-Way Intersection | 1 |
Three-Way Intersection | 1.25 |
1.5 | |
Figure 1. Types of Nodes

A (publicly accessible) pedestrian link shall be required between a neighborhood link or node including cul-de-sac
bulb or street turnaround, within 500 ft or less of the next closest connection to an adjacent
pedestrian connection and/or to significant pedestrian generators or destinations such as schools, parks, trails, employment centers, commercial areas, residential neighborhoods, or similar features.
Required pedestrian links shall be constructed from all-weather solid surface material such as concrete, asphalt, or another similar material that would satisfy the State accessibility code and comply with the most recent accessibility standards as published under the Americans with Disabilities Act (ADA).
The requirements contained in Table 1 shall not apply if at least one of the following conditions prevents a through connection:
Obstacles associated with prior platting
of property from another landowner;
Construction of existing buildings or other barriers;
Railroad or utility right-of-way
; or
Existing limited-access motor vehicle
right-of-way
.
In addition to meeting all the requirements of paragraph 13.6.1C, Pedestrian Links Required, pedestrian links shall be provided between compatible uses such as civic, institutional, commercial, and residential uses.
For Design Districts, see Sec. 16.4, Streetscape
, Right-of-Way
, and Block
/Lot Standards.
The street network
, including common access driveways
permitted in paragraph 12.2.2B.2.b, Driveways
, for any subdivision
with internal roads
or access to any public road
shall achieve a minimum connectivity ratio of 1.15 in the Rural Tier, 1.40 in the Suburban Tier, 1.60 in the Urban and Compact Tier.
B. Street links and nodes along a collector or arterial street providing access to a proposed subdivision
shall not be considered in computing the connectivity ratio.
C. Required stub-outs that cannot be constructed pursuant to paragraph 12.3.1F, Stub Outs
, shall be considered as being present as a link at the ratio of one link per side as provided in paragraph 12.3.1F, Stub Outs
, for purposes of determining if the required ratio has been met.
Figure 2. Connectivity Ratio Example

A. Phasing plans shall be included in the first submittal and shall be reviewed and evaluated as part of the overall development
.
1. Off-site improvements are excluded from phasing; however, they may be required within a certain phase to satisfy overall development
requirements.
2. Phases shall be designed to ensure the efficient construction of future phases. Each phase of a development
shall be designed and function with the utilities, fire protection, right-of-way
infrastructure, and stormwater
management necessary to serve that phase.
3. Each phase shall contain the minimum tree coverage percentage as required per Sec. 8.3, Tree Protection and Tree Coverage.
4. Lot numbers shall not be duplicated within different phases of the same subdivision
.
B. All right-of-way
and/or easements
for public infrastructure servicing the respective phase must be recorded with the first plat
.
C. Water and sewer extension permit applications for each individual phase of the project are required after plan approval.
D. No land disturbing activity
in a subsequent phase shall commence until:
1. The first asphalt layer of the street or other vehicular system of the previous phase has been laid and inspected; and
2. The lot(s) in the previous phase have been stabilized, inspected, and approved per the County and State Sedimentation
and Erosion
Control standards.