Lancaster | Lots and Subdivisions
Lancaster Lot Size, Parcel Maps, Tract Maps and SB 9 Urban Lot Splits
Lancaster keeps its lot size rules in Title 17, the zoning code, and its subdivision rules in Title 16 of the Municipal Code. A subdivision is any division of one piece of land into two or more lots that can be sold separately, and it needs a map approved by the City. This page sets out the minimum lot by zone, the kinds of maps, who approves them and for how long, and how Lancaster applies the SB 9 urban lot split and the SB 684 small-lot map. The Lancaster overview sums up the guide.
Lancaster lots and maps in six facts
- The smallest urban house lot is 7,000 square feet and 60 feet wide in the R-7,000 zone. Source: LMC 17.08.060
- Dividing land into five or more parcels takes a tract map, and four or fewer a parcel map. Source: LMC 16.04.230
- An approved tentative map expires after 24 months, with extensions of up to 3 years in total. Source: LMC 16.08.140
- An SB 9 urban lot split needs a lot of at least 2,400 square feet, cut into two lots of at least 1,200 square feet each. Source: LMC 16.17.050
- Each lot from an urban lot split needs at least 20 feet of frontage on a public street. Source: LMC 16.17.050
- State law requires a decision on an urban lot split within 60 days of a complete application. Source: Gov. Code 66411.7
Minimum Lot Size by Zone
| Zone or lot type | Minimum area | Minimum width | Minimum depth |
|---|---|---|---|
| RR-2.5 | 100,000 sq ft | 165 ft | 250 ft |
| RR-1 | 40,000 sq ft | 110 ft | 130 ft |
| SRR | 20,000 sq ft | 85 ft | 120 ft |
| R-15,000 | 15,000 sq ft | 85 ft (100 on a corner) | 120 ft |
| R-10,000 | 10,000 sq ft | 70 ft (85 on a corner) | 100 ft |
| R-7,000 | 7,000 sq ft | 60 ft (75 on a corner) | 100 ft |
| Corner duplex lot (R zones) | 10,000 sq ft | 100 ft | 100 ft |
| MDR and HDR apartments | 6,000 sq ft | 60 ft (80 on a corner) | 100 ft |
| Mixed use house, front driveway | 4,750 sq ft | 50 ft | 85 ft |
| Mixed use house, alley access | 3,500 sq ft | 40 ft | 75 ft |
| Mixed use apartments, front driveway | 10,000 sq ft plus 1,600 per home over 2 | 80 ft | 160 ft |
| Mixed use apartments, alley access | 6,000 sq ft plus 1,600 per home over 2 | 60 ft | 75 ft |
Sources: Lancaster Municipal Code 17.08.060 (rural, urban, corner duplex and MDR and HDR tables) and 17.10.060 (mixed use lot dimensions), Supplement 10 - 2025.
Each lot in a new subdivision must meet these numbers. Section 16.20.110 says "Each lot shall have an area, width, depth and frontage not less than required by any applicable specific plan or the zone in which the lot is located." Section 17.40.130 bars any division that leaves a lot below the zone minimum, and sets a default for a zone that gives none: "the minimum lot area shall be 5,000 square feet, the minimum lot depth shall be 100 feet, and the minimum lot width shall be 50 feet."
Older small lots are protected. Section 17.08.020 says the title does not intend to make "previously legally created building lots" nonconforming when they met the rules in force when they were created. Section 17.40.100 lets contiguous lots at least 100 feet deep but under 50 feet wide be treated as one parcel when their combined frontage reaches 50 feet. On such a parcel, two single-family homes may be built in the RR, SRR or R zones, and in MDR two duplexes or a house and a duplex.
In the mixed use zones the apartment minimum grows with the number of homes. By VanPlex arithmetic on Section 17.10.060, a fourplex on an alley lot needs 6,000 + 2 x 1,600 = 9,200 square feet, and the same fourplex with a front driveway needs 10,000 + 2 x 1,600 = 13,200 square feet. In the rural zones, Section 16.20.120 adds a rule for rural subdivisions: where a subdivision divides land to less than 50 percent of the density range, the lots must be laid out "to allow the lots to be further subdivided in the future."
Kinds of Maps and Who Approves Them
| Map | Used for | Decided by |
|---|---|---|
| Tentative and final tract map | 5 or more parcels or condominiums | Planning Commission (tentative); final map to the Director of Public Works or City Engineer |
| Tentative and final parcel map | 4 or fewer parcels or condominiums | Planning Commission (tentative) |
| Parcel map waiver | Record data describes the lots; in RR zones each lot 10 gross acres or more | Planning Commission |
| Administrative parcel map | Land already subdivided with all public improvements installed | Director, within 30 days |
| Urban lot split (SB 9) | One lot into two in a single-family zone | Director of Development Services, no hearing |
| SB 684 or SB 1123 map | Up to 10 parcels and 10 homes | Staff under state law, no hearing |
Sources: Lancaster Municipal Code 16.04.230, 16.04.200, 16.16.020, 16.16.030 and 16.17.040; Government Code 66499.41.
A tentative map is the first, detailed drawing of a planned division, reviewed with conditions. A final map is the survey-grade map recorded after the conditions are met. Under Section 16.04.230, a tract map is needed for "all divisions of land which create five or more parcels including five or more condominiums," and a parcel map for "four or less parcels." A vesting tentative map, which locks in the City's rules "in effect at the time the application is complete" (Section 16.08.320), may be used wherever a tentative map is required.
Section 16.04.200 names the Planning Commission as the "advisory agency" with authority "To approve, conditionally approve, or deny applications for tentative subdivision maps and parcel map waivers." Before the hearing, a development review committee studies the map and recommends conditions (Section 16.04.190). Decisions under Title 16 may be appealed to the City Council under Section 16.04.070.
Two shorter routes exist for simple divisions. The Planning Commission may waive the final parcel map when the City Engineer finds that "sufficient record data exists to describe the division of property"; in the rural zones each lot must then have at least 10 gross acres, or be a quarter of a quarter of a quarter section of a government plat, and not be on sloping terrain. The Director may approve an administrative parcel map for land "that has all public improvements installed; and has been previously subdivided," deciding "within thirty (30) days." If the Director denies it, the owner may file a normal tentative parcel map.
Map Time Limits and Conditions
- Expiry. "An approved or conditionally approved tentative map shall expire twenty-four (24) months from the date of planning commission or city council approval" (Section 16.08.140).
- Extensions. Filing a request before expiry extends the map "for a period of sixty (60) days or until the extension request is acted upon, whichever occurs first," and extensions may total "three (3) years."
- Improvements. Required improvements must be completed, or guaranteed by an agreement with the City, before a final map is presented (Section 16.24.020). Subdivisions where each parcel has at least 20 gross acres are exempt from improvement requirements (Section 16.24.070).
- Flag lots. "The use of flag lots is discouraged." The Planning Commission may approve one only when topography or nearby lots and buildings leave no practical way to provide street access (Section 16.20.210).
- Biological impact fee. New subdivisions pay it "prior to city council approval of a final subdivision map" (Section 15.66.040). New homes on existing legal parcels are exempt.
SB 9 Urban Lot Splits in Lancaster
An urban lot split is the state's SB 9 route for dividing one house lot into two, approved by staff with no hearing. Lancaster wrote its own chapter for it, Chapter 16.17, first adopted by Ordinance No. 1087 on December 14, 2021. Section 16.17.040 says the application "is approved or denied ministerially, by the development services director. No discretionary review or public hearing process shall be applied." The SB 9 page explains the state law. Lancaster's main rules are:
- Zones. RR-2.5, RR-1, SRR, R-15,000, R-10,000 and R-7,000 only.
- Who may apply. "Only individual property owners may apply for an urban lot split." The City reports missing items "within thirty (30) days."
- Lot sizes. The lot must be "at least two thousand four hundred (2,400) square feet in size," each new lot at least 1,200 square feet, and each new lot "between forty (40) and sixty (60) percent of the original lot area."
- Access. Each new lot must adjoin the public right-of-way with "frontage on the public right-of-way of at least twenty (20) feet."
- No street work. "no dedication of rights-of-way or construction of offsite improvements is required for an urban lot split." Easement agreements with each utility must be recorded before the final map.
- One split only. No split of a lot created by an earlier urban lot split, or of a lot next to one the same owner split.
- Protected housing. No demolition or alteration of rent-restricted homes, homes under rent control, homes withdrawn under the Ellis Act in the last 15 years, or homes "occupied by a tenant in the last three years," backed by a sworn statement. No more than 25 percent of exterior walls may come down unless no tenant has lived there in three years.
- Map life. "The tentative parcel map expires three months after approval by the director."
Homes on the new lots follow the two-unit rules in Chapter 17.41, Article III: at most two units on each lot, each new home up to 800 square feet and one story. The ADUs and SB 9 page covers those limits.
By VanPlex arithmetic, a 7,000 square foot R-7,000 lot can split into two lots of 3,500 square feet, and the smallest allowed share, 40 percent, would be 2,800. Section 16.17.050.G.5 adds a rule that is hard to read: "Each resulting lots shall not have a width less than the width of the original lot." Read word for word, a side-by-side split, which halves the frontage, cannot meet it, so a front-and-back split with the 20 foot frontage strip may be the only layout. Ask the City how it measures width before you pay for a survey.
Where State Law Controls the Lot Split Chapter
- The 60 day decision. Government Code 66411.7 says an application "shall be considered and approved or denied within 60 days from the date the local agency receives a completed application," or it is deemed approved. Chapter 16.17 sets no deadline, so the statute applies.
- Owner occupancy. The statute requires an affidavit that the applicant "intends to occupy one of the housing units as their principal residence for a minimum of three years," and says a city "shall not impose additional owner occupancy standards." Section 17.41.058.J.3 says the owner "shall occupy at least one of the units for a period of not less than 3 years." Where the City rule goes beyond the affidavit, the statute controls.
- Who may apply. The statute's affidavit rule does not apply to a community land trust or a qualified nonprofit, and Lancaster's definition of "individual property owner" lets those two apply as well.
SB 684 and SB 1123 Small-Lot Maps
Lancaster's Title 16 has no chapter for SB 684 or SB 1123, so the state statute applies as written. Government Code 66499.41 requires a city to decide "without discretionary review or a hearing" a map that "will result in 10 or fewer parcels" with 10 or fewer homes. The lot must be zoned for apartments and be "no larger than five acres," or be "A vacant lot zoned for single-family residential development" that "is no larger than one and one-half acres," and in both cases "substantially surrounded by qualified urban uses." New parcels may be as small as 600 square feet, or 1,200 in a single-family zone, and the average home may not exceed 1,750 net habitable square feet. The city must decide within 60 days. In Lancaster that means MDR, HDR and mixed use lots up to 5 acres, and vacant RR and R lots up to 1.5 acres. The SB 684 and SB 1123 page explains the law.
The MDR and HDR standards table in Section 17.08.060 notes that its standards "may be modified on qualified site developed in accordance with the provisions of California Government Code Title 7, Division 2, Chapter 8 (The Starter Home Revitalization Act of 2021)." Section 66499.40, added in 2021 by AB 803, allows a "small home lot development" on a multifamily lot "no larger than five acres." Ask the City which of these statutes it applies to a given map.
Best For
- ✓ R-7,000 lots of 7,000 square feet or more, which can split into two lots of 3,500.
- ✓ Previously subdivided land with all improvements in, which can use an administrative parcel map.
- ✓ Vacant house lots up to 1.5 acres, which can use an SB 1123 map of up to 10 lots.
Usually Fails When
- ✕ The applicant for an SB 9 split is a company or partnership.
- ✕ A tenant has lived in the home in the last three years and the plan alters it.
- ✕ The split layout depends on a flag lot without the conditions in Section 16.20.210.
What To Verify Before Spending Money
- → How the City measures width under Section 16.17.050.G.5.
- → Whether the lot was created by an earlier urban lot split.
- → The current biological impact fee and map fees set by City Council resolution.
Where to Go Next
Related on VanPlex: the Lancaster overview, the SB 9 page and the SB 684 and SB 1123 page.
Frequently Asked Questions
What is the minimum lot size for a house in Lancaster?
How big must a Lancaster lot be for apartments?
Who approves a lot split in Lancaster?
How long does a Lancaster tentative map last?
How small can the lots be in a Lancaster SB 9 lot split?
Who may apply for an SB 9 lot split in Lancaster?
Can a Lancaster lot be split twice under SB 9?
Does a Lancaster SB 9 lot split require street improvements?
Are flag lots allowed in Lancaster?
Does a new Lancaster subdivision pay a biological impact fee?
Official sources (checked October 2026)
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