What is a pre-approved ADU plan?

A building design the city has already reviewed and approved in advance. Because the review is done, your permit application is processed ministerially — approved within 30 days under AB 1332, with no discretionary review and no hearing.

Do pre-approved ADU plans cost money to use?

The plan sets themselves are published by the city and are typically free or low cost to use. Wildomar states its plans are free to use. You still pay permit and impact fees, and you still pay a builder to construct the unit.

Pre-approved plans

Plans your city has already approved

California law now requires every city to maintain a pre-approved ADU plan process, and 4 of the six cities we cover have published real catalogs. We have21 of their plans loaded. Pick one, drop it on your lot, and see whether it fits.

Free
No account
No phone number
Your result first

Aerial: USGS/USDA NAIP

Why this is the fastest path to a permit

Custom design

Full discretionary plan check
Two or three correction cycles is normal
A hearing, where a neighbor can object
The full architectural fee

Monthsdesign, corrections and resubmittals

Pre-approved plan

Ministerial — the city already reviewed and signed off on the design
No discretionary review, no planning commission, no hearing
Most of the architectural fee is already spent

30 daysrequired by AB 1332

The trade-off is honest: you build what the city drew. If you want a specific layout, a custom design is still the right call — you are buying flexibility with time.

Under 750 sq ft, impact fees are waived by statute. Several city plans sit deliberately just below that line, which is worth noticing when you compare two similar sizes.

Menifee

Permit Ready ADU Program · Guidebook published; its square footages conflict internally

Plan	Size	Beds / baths	Footprint
Studio B	306 sq ft Impact fees waived	Studio / 1	15 × 20 ft Approximate
Studio A	415 sq ft Impact fees waived	Studio / 1	21 × 20 ft Approximate
1 Bedroom 1B	586 sq ft Impact fees waived	1 bed / 1	24 × 24 ft Approximate
1 Bedroom 1A	730 sq ft Impact fees waived	1 bed / 1	28 × 26 ft Approximate
2 Bedroom 2B	779 sq ft	2 bed / 2	30 × 26 ft Approximate
2 Bedroom 2A	910 sq ft	2 bed / 2	35 × 26 ft Approximate
3 Bedroom 3A	1,198 sq ft	3 bed / 2	40 × 30 ft Approximate

Try Menifee plans on my lot Menifee ADU rules

Wildomar

PRADU (Pre-Approved ADU) · Plan sets free from the city

Plan	Size	Beds / baths	Footprint
Studio	493 sq ft Impact fees waived	Studio / 1	29 × 17 ft
One Bedroom	646 sq ft Impact fees waived	1 bed / 1	38 × 17 ft
Two Bedroom A	749 sq ft Impact fees waived	2 bed / 1	35 × 28 ft Approximate
Two Bedroom B	1,139 sq ft	2 bed /	34 × 31 ft Approximate
Three Bedroom A	994 sq ft	3 bed /	38 × 29 ft Approximate
Three Bedroom B	1,195 sq ft	3 bed /	43 × 34 ft Approximate

Try Wildomar plans on my lot Wildomar ADU rules

Temecula

PRADU (Permit Ready ADU) · Unmodified plans reviewed in 7–10 business days

Plan	Size	Beds / baths	Footprint
Studio	499 sq ft Impact fees waived	Studio / 1	29.33 × 17 ft Approximate
1 Bedroom	625 sq ft Impact fees waived	1 bed / 1	36.75 × 17 ft
1 Bed, larger	749 sq ft Impact fees waived	1 bed / 1	44 × 17 ft
2 Bedroom	909 sq ft	2 bed / 2	40 × 31 ft Approximate
2–3 Bedroom	1,194 sq ft	3 bed / 2	37.67 × 35 ft Approximate

Try Temecula plans on my lot Temecula ADU rules

Lake Elsinore

Permit Ready ADU Program

Plan	Size	Beds / baths	Footprint
Garage Conversion Garage conversion	400 sq ft Impact fees waived	1 bed / 1	20 × 20 ft Approximate
New ADU (small)	495 sq ft Impact fees waived	1 bed / 1	21 × 24 ft Approximate
New ADU (large)	735 sq ft Impact fees waived	2 bed / 1	28 × 26 ft Approximate

Try Lake Elsinore plans on my lot Lake Elsinore ADU rules

Cities whose catalogs we are still verifying

Every California jurisdiction is required to have a pre-approved plan process. For these cities we have not yet confirmed a published catalog from an official source, so we are not going to list plans we cannot verify exist.

Murrieta — program identified, plan list being confirmed
Perris — program being confirmed

In the meantime these cities get standard size presets in the tool, so you can still check what fits on your lot.

Standard sizes, for comparison

These are not city-approved designs. They are realistic size presets we use so you can explore what fits before committing to a specific plan.

Size	Typical use	Footprint
400 sq ft	Studio / 1 bath	20 × 20 ft
600 sq ft	1 bed / 1 bath	25 × 24 ft
800 sq ft	2 bed / 1 bath	31 × 26 ft
1,000 sq ft	2 bed / 2 bath	33 × 30 ft
1,200 sq ft	3 bed / 2 bath	40 × 30 ft

How we got the numbers

About those footprint dimensions

Cities publish square footage. Almost none publish a width and a depth — which is the only number that answers whether something fits between two setback lines.

Where a city published real dimensions, we use them.
Where it did not, we derive a plausible rectangle from the floor area and mark itapproximate everywhere it appears.
A derived rectangle is used for siting geometry only. It is never the building design, and a plan marked approximate may be laid out quite differently.

We would rather show you a labelled approximation than quietly imply precision we do not have.

Which of these fits your lot?

Drop any plan on your real parcel. Free, no account.