The listing said "charming 1940s bungalow, needs updating." What it did not say is that the lot is 41 feet wide, and the first contractor through the door leads with "you cannot do much here." Before believing that, it is worth reading what the city actually requires.
Short answer: In Pasadena one family districts, side setbacks are 10 percent of the lot width, with a floor of 5 feet and a ceiling of 10 feet (17.22.030). On a 41 foot wide lot, 10 percent is 4 feet, so the 5 foot floor governs both sides — leaving 31 feet of buildable width. And a lot this size has no maximum site coverage at all.
The property
| Item | Value |
|---|---|
| City | Pasadena |
| Lot area | 5,165 square feet |
| Lot width and depth | 41 by 128 feet |
| Year built | 1946 |
| House size | 1,410 square feet |
| Bedrooms and bathrooms | 3 and 2 |
| Zoning district | RS-6, one family residential |
| Zoning source | City of Pasadena official GIS, live city layer |
Key numbers for this district
| Standard | RS-6 requirement | Applied to this lot | Source |
|---|---|---|---|
| Side setback | 10 percent of lot width, minimum 5 feet, maximum 10 feet | 5 feet each side | 17.22.030 |
| Rear setback | 25 feet | 25 feet | 17.22.030 |
| Minimum lot area | 7,200 square feet | lot is 5,165, below it | 17.22.030 |
| Minimum lot width | 55 feet | lot is 41, below it | 17.22.030 |
| Maximum site coverage | none for a site of 7,200 square feet or less | no coverage cap applies | 17.22.030 |
| Maximum density | one dwelling unit per lot | one | 17.22.030 |
The width question, answered with this lot
Side setback is the gap the code requires between your wall and the side property line. Pasadena does not give one fixed number for it — the requirement scales with how wide your lot is, then stops at both ends.
Ten percent of 41 feet is 4 feet, which is below the 5 foot floor, so 5 feet applies on each side. Subtract both and 31 feet of width remains to build in. The existing house is 1,410 square feet on a 128 foot deep lot, so it is almost certainly narrower than that already.
Note what the scaling does: the narrower the lot, the smaller the percentage becomes in absolute feet, and the floor catches it. A 100 foot wide lot in the same district owes 10 feet per side, the maximum. The rule is written so a narrow lot is not squeezed proportionally.
The rule you expected does not apply here
Most people assume lot coverage is the binding limit. In this district it is not, for a lot this size:
Site 7,200 sf or less: No maximum
That is the coverage row for a site at or below 7,200 square feet, and this lot is 5,165 (17.22.030). Sites above that threshold are held to 35 percent, and above 12,000 square feet to 35 percent or 4,800 square feet, whichever is greater.
What actually limits the size, then
Floor area, and it is measured against the neighborhood rather than the lot. The allowable floor area of houses may not exceed 35 percent above the median house size of all properties within a 500 foot radius, and that radius serves as the neighborhood for compatibility purposes (17.22.030).
So the number that governs an addition here is not on the deed — it is the median of the block. Two identical 41 foot lots in different parts of the city can carry different houses.
The lot is undersized, and that is not fatal
RS-6 asks 7,200 square feet and 55 feet of width for new parcels; this lot is 5,165 and 41. Those minimums govern creating lots, not building on ones that already exist (16.12.230). What the undersize does change is the arithmetic above — the width feeds the setback, and the area decides which coverage row applies.
Definitions for the terms used here, including how the code defines a lot and its width, are collected in one place (17.80.020).
What this does not settle
Front setbacks in this district are governed by a separate section rather than a single number, and an encroachment plane limits how tall a wall can be near the side line — neither is quoted above. Historic district and overlay status change the height rules. Easements, utilities and existing nonconforming conditions appear in none of it. Confirm with Pasadena planning before drawing. The Pasadena overview collects the rest of the city rules.
