Most people researching a lot split spend their time on one question: is the lot big enough? They run the arithmetic, find the answer is yes, and assume the rest is paperwork. In Palm Springs the arithmetic is the easy part. The ordinance that lets you split the lot also tells you what the second house has to be made of, how bright the porch light can be, and which direction its windows may not face.
Short answer: A Palm Springs urban lot split needs an original lot of at least 2,400 square feet, resulting lots of at least 1,200 square feet each, and each new lot sized between 40 and 60 percent of the original (9.62.055). An 11,326 square foot lot clears all three with room to spare. The conditions that follow are where the project is actually decided.
The property in this example
| Item | Value |
|---|---|
| City | Palm Springs |
| Lot area | 11,326 square feet |
| Zoning district | R-1-C, one of the city's five single-family zones (92.01.00) |
| District minimum lot area | 10,000 square feet (92.01.03) |
| District lot coverage cap | 35 percent (92.01.03) |
Key numbers
| Test | The number | Where it comes from |
|---|---|---|
| Minimum size of the lot being split | 2,400 square feet | 9.62.055 |
| Minimum size of each new lot | 1,200 square feet | 9.62.055 |
| Balance between the two new lots | Each between 40 and 60 percent of the original | 9.62.055 |
| New driveways | One per new lot, at most 18 feet wide | 9.62.055 |
| Garage doors facing the street | Less than 50 percent of the facade width | 9.62.055 |
| Screening trees | At least two 24-inch box drought-tolerant trees per new lot | 9.62.055 |
The size test, on this lot
Forty percent of 11,326 square feet is about 4,530 square feet, and sixty percent is about 6,796. That is the whole permissible range for each half: the widest lawful split is roughly 4,530 and 6,796, and an even one lands near 5,663 apiece.
Note what the balance rule does. It is a ceiling as well as a floor — you cannot shave off a small corner lot and keep the bulk, because neither piece may exceed sixty percent. Both ends of the range here sit far above the 1,200 square foot minimum, so on a lot this size the balance rule is the binding constraint and the minimum never comes into play.
The district's own minimum lot area for R-1-C is 10,000 square feet (92.01.03), which is more than either half would be. That is a different rule doing a different job: the urban lot split section states its own size tests, and they are the ones written for this kind of subdivision.
What decides it instead
Before any of the design rules matter, the lot has to clear a set of eligibility screens (9.62.055):
- It must be in a single-family residential zone, meaning a zone where the only residential use allowed as a primary use is one dwelling on a lot.
- It must not be within a hillside area as the zoning code defines that term — a real constraint in Palm Springs.
- It must not be historic, or within a historic district on the State Historic Resources Inventory or designated by ordinance.
- It must not have been created by a previous urban lot split, and must not sit next to a lot the same owner split earlier.
- No protected housing may be demolished or altered: income-restricted or rent-controlled housing, anything withdrawn from the rental market under the Ellis Act in the previous 15 years, or housing occupied by a tenant in the last three years. The applicant and owner sign a sworn statement, and the city may investigate it.
Very high fire hazard severity zones, earthquake fault zones and flood hazard areas are not flat bars — each has a compliance path — but each adds work. None of these facts appears in a parcel record, so every one of them is something to confirm rather than assume.
Then the city designs the house with you
This is the part that surprises owners. Palm Springs attaches an unusually detailed set of objective standards to anything built after an urban lot split (9.62.055).
The new house has to match the old one. If a legal primary dwelling existed before the split, any new primary dwelling visible from a public right-of-way must match it in exterior materials, color, and dominant roof pitch — the slope shared by the largest part of the roof. If there was no house before and two are built, they must match each other.
Windows may not look into the neighbors.
No window or door of a dwelling that is constructed on the lot after the urban lot split may have a direct line of sight to an adjoining residential property.
Fencing, landscaping or privacy glass may be used to satisfy it, which in practice means the floor plan and the screening plan get designed together rather than in sequence.
Lighting and garages. All exterior lighting is limited to down-lights. If an attached garage is visible from a public right-of-way, the total width of its doors must be less than fifty percent of the width of the facade facing that street — a rule that quietly rules out a wide two-door garage on a narrow frontage.
Screening is measured, not described. Evergreen screening must be planted between each dwelling and the adjacent lots, at one five-gallon plant per five linear feet of exterior wall, or one 24-inch box plant per ten linear feet. Screening plants must be at least six feet tall when installed, or a solid six-foot fence may be substituted. Every new lot needs at least two 24-inch box drought-tolerant trees, and everything planted must be drought tolerant and drawn from the city's approved plant list.
Access. One new driveway per new lot, no wider than eighteen feet measured outside edge to outside edge, and at least thirty feet from the corner property lines at a street intersection. Parking bays taking direct access from a public right-of-way are prohibited.
Parking, utilities and the shared line
At least one off-street space per unit is required, unless the lot is within half a mile walking distance of a bus corridor running at fifteen-minute peak headways, a rail or bus rapid transit station, or the intersection of two or more major bus routes at that frequency — or within one block of a car-share vehicle. Tandem parking is expressly allowed on a lot created this way (9.62.055).
Each primary dwelling on the resulting lots must have its own direct utility connection, and the owner must sign easement agreements with each public service provider and record them before the final map is approved. In exchange, the city may not require right-of-way dedication or off-site improvements for an urban lot split.
Building on the shared line is possible. A zero-lot-line condition is allowed only on the common property line between the two new lots, never on a line shared with an existing neighbor. Where it is used, the setback comes back on the other side: the aggregate side yard must equal the underlying zone's minimum side yard or eight feet, whichever is greater. In R-1-C the interior side yard is ten feet (92.01.03), so ten is the figure that governs. The aggregate rear yard follows the underlying zone and may drop to eight feet only where the ordinary setbacks physically prevent building two units, or either unit reaching 1,000 square feet.
One relief worth knowing: an urban lot split may be approved without requiring an existing legal nonconforming condition to be corrected. But every structure built must meet current local building standards, and the ordinance states plainly that an urban lot split is a change of use.
What this does not settle
Nothing here is a determination that a split will be approved. Hillside classification, historic status, tenancy history, prior subdivision and hazard mapping are all facts about this specific parcel that a lot area cannot answer, and each one can end the project on its own. The height envelope, front and rear yards and coverage cap for whatever gets built are the ordinary R-1-C standards (92.01.03) and are not analysed here. Confirm with Palm Springs planning; the Palm Springs overview collects the rest.
