ADU builder · South Pasadena, CA
ADU builder in South Pasadena.
Design, permits, financing and construction from one local team. 600+ ADUs delivered across greater LA, including projects in and around South Pasadena.
Licensed & insured · Construction from $275/sq ft · 5.0★ rated
Building an ADU in South Pasadena
South Pasadena is a small city of older homes, and many of them sit in historic districts or count as potential historic resources. That shapes ADU design. The ADU usually has to look like it belongs with the house, and the city has its own application track and design standards for historic properties. Owners still build: the city issued about 50 ADU permits in each of 2023 and 2024 and about 26 in 2025, per state housing reports.
ADU Resource Center designs, permits and builds ADUs in South Pasadena with one in-house team. Here we built a 1,025 sq ft, 2-bedroom, 2-bath ADU so the owner's parents, both in their early 80s, could live in the backyard on their own. The house dates to 1913, so the L-shaped ADU went through South Pasadena's historic review with matching shingle siding and river rock at the foundation. We've also built in Pasadena, Highland Park and Alhambra.
We give you a fixed quote before construction begins, and the same project manager follows the job from historic review through final inspection. If you need financing, we'll help you line it up.
ADUs in South Pasadena: quick facts
Updated November 2026
- Who issues ADU permits
- City of South Pasadena
- Our construction rates
- $275, $300 or $325 per sq ft (basic, mid-range, luxury); garage conversions $235–$285 per sq ft
- Example cost
- A 600 sq ft one-bedroom runs about $165K–$195K in construction
- Size limits under state law
- Detached ADUs up to 1,200 sq ft on many lots; junior ADUs up to 500 sq ft inside the home
- Permit decision
- State law requires a decision within 60 days of a complete application
- Who builds it
- ADU Resource Center: design, permits and construction by one team, 600+ ADUs delivered, office in Glendale
ADU rules change. We confirm the current rules for your lot on the free consultation.
Real projects in and around South Pasadena
Our work in and around South Pasadena.
Hear it from our clients
Homeowners on building their ADU with us
More stories on our testimonials page.
Local know-how
What to know before building in South Pasadena.
Two application tracks
South Pasadena has one ADU application for regular properties and another for properties with a designated or potential historic resource. Picking the right one up front avoids a restart, and we check your property's status first.
Historic design standards
The city adopted ADU design standards for historic properties so that compliant designs can be approved by staff. Materials, roof form and placement matter. On our project, matching shingles and river rock meant sourcing materials you can't buy at a big box store.
Older garages and sheds
Demolishing an older accessory structure can trigger a historic check of that building. It comes up whenever an ADU replaces an old garage. See garage conversion costs if you'd rather reuse the garage.
Room for a bigger unit
If your lot has room, a 2-bedroom ADU is possible, and state law allows detached ADUs up to 1,200 sq ft on many lots. Browse our floor plans and we'll confirm what fits yours.
What it costs
ADU cost in South Pasadena
We build at a flat rate per square foot: $275 (basic), $300 (mid-range) and $325 (luxury) finishes. Here's what that means for common sizes. Construction only; design, permits and city fees are quoted separately on your consultation.
| ADU size | Basic | Mid-range | Luxury |
|---|---|---|---|
| 400 sq ft studio | ~$110K | ~$120K | ~$130K |
| 600 sq ft 1-bedroom | ~$165K | ~$180K | ~$195K |
| 800 sq ft 2-bedroom | ~$220K | ~$240K | ~$260K |
| 1,000 sq ft 2–3 bedroom | ~$275K | ~$300K | ~$325K |
Get a number for your exact size: ADU cost calculator · Browse ADU floor plans · Converting a garage? See garage conversion cost.
Free consultation
Start your South Pasadena ADU.
Tell us about your property. We'll confirm what's buildable, give you a real price range and walk through financing within 1 business day.
Questions
South Pasadena ADU questions, answered.
Still have a question? Ask us during your free consultation.
Who issues ADU permits in South Pasadena?
South Pasadena is its own city, so ADU plans go to the City of South Pasadena's Community Development Department, not to LA City or the county. The city uses a different ADU application for properties with a designated or potential historic resource. We prepare the right application, submit the plans and answer the corrections.
Can I build an ADU behind a historic house in South Pasadena?
Yes. The city has design standards for ADUs on historic properties, and an ADU that follows them can usually be reviewed at staff level. We've done it here: our ADU behind a 1913 house used the same shingle siding and river rock as the main home and passed the city's historic review.
What if my old garage has to come down?
Tearing down an older garage or shed can prompt the city to check whether that structure is historic before it approves the demolition. Plan for that step if your ADU replaces an old accessory building. We flag it at the start so it doesn't surprise you in plan check.
How much does an ADU cost in South Pasadena?
We charge a flat construction rate of $275, $300 or $325 per sq ft for basic, mid-range or luxury finishes, so a 600 sq ft one-bedroom lands around $165K–$195K. Matching historic materials, like specialty siding or stonework, can add to the fixed quote, and we price those choices before you commit.
Is a garage conversion big enough for parents?
Sometimes it isn't. One South Pasadena family started out planning a garage conversion, found the garage was only about 300 sq ft, and built a 1,025 sq ft, 2-bedroom ADU instead. If your garage is roomier, a conversion at $235–$285 per sq ft can work well, and we'll compare both options for your lot.
Free consultation
Ready to build your ADU in South Pasadena?
Tell us about your property and we'll confirm what's buildable, give you a real price range and lay out financing on one free call.
