Spring Knolls, Murrieta, CA
Adding an ADU in Spring Knolls
Spring Knolls goes back to 1971, which makes its original core among the oldest housing in Murrieta.
The caveat is that construction continued all the way to 2021, so this is really two neighborhoods sharing a name — and only one of them has the deep lots.
- Free
- No account
- No phone number
- Your result first
Aerial: USGS/USDA NAIP
Before you spend
What to know before you spend anything
The basics
Spring Knolls at a glance
- Built
- Dates to 1971; homes span 1971–2021
- Homeowners association
- Verify for your tract
- Lots
- Varies by phase
- ZIP
- 92562
We publish only what we verified. Lot dimensions vary enough inside a single tract that a neighborhood average would mislead you, so the tool reads your own parcel instead.
Why two Spring Knolls lots the same size answer differently
Both of these are 7,200 sq ft with the same 40 × 46 ft house, under Murrieta's rules. The only difference is the shape, and it changes the answer.
60 ft wide, 120 ft deep
Fits1 Bedroom
- Buildable after setbacks
- 2,858 sq ft
- Plans that fit
- 2 of 5
90 ft wide, 80 ft deep
Unlikely1 Bedroom
- Buildable after setbacks
- 2,938 sq ft
- Plans that fit
- 0 of 5
Two made-up lots, but not made-up numbers: the green area, the fit verdicts and the plan counts are computed with Murrieta's own 4 ft setback and 6 ft separation by the same functions the lot tool runs on a real parcel. Your lot is not either of these, which is the point — we read yours.
Honest limits
What the geometry check can and cannot tell you
Why three answers, not yes or no
- Public parcel lines sit 3 to 25 ft from the surveyed boundary.
- The setback being measured is only 4 ft.
- When the error bar is wider than the measurement, "yes" is a guess. So: Fits Tight Unlikely
What public data cannot see
- Easements through the rear yard
- Slope
- Sewer or septic capacity
- Electrical panel capacity
- Soil conditions
Any one of these can stop a project that passes the geometry check.
On a tight lot, studio needs about 20 by 20 ft of clear space — and staying under 750 sq ft waives impact fees entirely.
Your HOA
The Spring Knolls association cannot say no
- It cannot prohibit an ADU. Gov. Code §66315 voids covenants that prohibit or unreasonably restrict one on a single-family lot.
- It can apply architectural standards. Expect an architectural committee submission.
- Submit to both at once. Association review and city plan check are independent. Running them in sequence adds a month for no reason.
Nearby
Other Murrieta neighborhoods
See what fits on your Spring Knolls lot
Free. You see the result before we ask for anything.