ADU Builder & Home Additions in South Pasadena, CA
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Open-plan living room and kitchen with polished concrete floors
- South Pasadena
Design · Permit · Build
ADUs & Additions in South Pasadena
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for South Pasadena Homes
South Pasadena is a small city that takes its architecture seriously, and we plan for that from the first sketch. Much of what we touch here is a century old, so we treat the existing house as a design constraint rather than a blank slate. Our scopes account for historic review, protected oaks, tight rear-alley access, and electrical systems that were never sized for a pool heater or a detached studio.
Most parcels are modest by San Gabriel Valley standards: long, narrow lots with generous street trees and detached garages set at the rear. Hillside neighborhoods trade flat yard for slope and view.
We are a design-build team, which means the people who draw your project are the people who build it. Design, engineering, permits and construction run through one project manager and our own crews, so nothing gets lost in a handoff between a salesperson and a subcontractor. We are licensed, bonded and insured, CSLB license #1119054 .
Permits in South Pasadena: Residential permits come from the Building Division of the Community Development Department, with entitlements handled by the Planning Division in that same department. Because so much of the housing stock is historic, alterations, additions, and demolitions affecting designated resources go before the Cultural Heritage Commission for a Certificate of Appropriateness.
The city's tree ordinance protects all oak species and other mature protected trees, requiring a removal permit and replacement planting, with steep fines for unpermitted removal. The Raymond Fault Alquist-Priolo Earthquake Fault Zone crosses the city.
State law exempts most individual one- and two-story wood-frame single-family homes from its fault-study requirement, but cities can set stricter rules, so we check parcels inside the zone early.
Permit details checked September 2026 against City of South Pasadena , South Pasadena Municipal Code and State of California . Rules change, so we confirm them again for your parcel.
What We Build
- Cultural Heritage Commission submittals
- Rear-alley ADU and pool access planning
- Service and sewer lateral upgrades
- Detached ADUs, ground-up
- Garage conversions to living space
- Junior ADUs within the main house
- Room additions and bump-outs
- Second-story additions
- Full kitchens and bathrooms in the ADU
- Separate utility metering where required
- Private entries, patios and landscaping
- Plans, engineering and city submittals
- Title 24 energy compliance
Local Conditions
What to Know in South Pasadena
These local conditions change the scope, the schedule and the budget.
01
Hillside tracts on the southwest side climb quickly, so pools and outdoor rooms there usually need retaining walls, pier-supported decks, and engineered drainage rather than simple flat-yard construction.
02
Craftsman and Victorian houses commonly sit on shallow unreinforced foundations with knob-and-tube remnants and undersized panels, so pool equipment and detached-unit loads usually force a service upgrade.
03
Deep, narrow lots with rear alleys are common, which favors detached ADUs but limits excavator size and often means conveyor or crane access for gunite.
04
Original clay sewer laterals under mature parkway trees are frequently root-intruded, and they get discovered during trenching for new backyard structures.
Areas we serve in South Pasadena:Altos de MontereyMission WestGarfield ParkRaymond Hill
Investment
What It Costs in South Pasadena
Real Southern California price ranges, not teaser numbers.
Detached ADU
$150,000 to $400,000+
What moves it: square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build
Garage conversion ADU
$80,000 to $180,000
What moves it: whether the existing slab and framing meet current code, how far utilities have to run, and the finish level of the kitchen and bathroom
Plans, drawings and permit management
$4,500 to $25,000+
What moves it: project type and size, whether structural engineering, Title 24 or a soils report is required, and how many jurisdictions or review bodies are involved
Your lot, access and finishes set the price. We walk the site, then show you where every dollar goes.
Get a line-item price for your South Pasadena property
The Process
How We Work in South Pasadena
01
Feasibility
We check lot size, setbacks, utilities and access to confirm what your property will actually support.
02
Design & 3D
Layout, elevations and finishes, modeled in 3D so you approve the unit before submittal.
03
Plans & Permits
We prepare the full drawing set, handle engineering and Title 24, and manage the city submittal and corrections. In South Pasadena that submittal goes to City of South Pasadena Community Development Department, Building Division.
04
Foundation & Framing
Site prep, foundation, framing and dry-in by our own crews.
05
Systems & Finishes
Electrical, plumbing, HVAC, insulation, then kitchen, bath and interior finishes.
06
Final Inspection
We pass final inspection, walk the unit with you and hand over the keys.
Questions
What South Pasadena Homeowners Ask
Who issues the permits for this work in South Pasadena?
City of South Pasadena Community Development Department, Building Division. Residential permits come from the Building Division of the Community Development Department, with entitlements handled by the Planning Division in that same department.
Because so much of the housing stock is historic, alterations, additions, and demolitions affecting designated resources go before the Cultural Heritage Commission for a Certificate of Appropriateness. The city's tree ordinance protects all oak species and other mature protected trees, requiring a removal permit and replacement planting, with steep fines for unpermitted removal.
The Raymond Fault Alquist-Priolo Earthquake Fault Zone crosses the city. State law exempts most individual one- and two-story wood-frame single-family homes from its fault-study requirement, but cities can set stricter rules, so we check parcels inside the zone early.
We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.
What makes building in South Pasadena different?
Most parcels are modest by San Gabriel Valley standards: long, narrow lots with generous street trees and detached garages set at the rear. Hillside neighborhoods trade flat yard for slope and view. One local condition that shapes the work: Hillside tracts on the southwest side climb quickly, so pools and outdoor rooms there usually need retaining walls, pier-supported decks, and engineered drainage rather than simple flat-yard construction.
Which parts of South Pasadena do you work in?
All of it, including Altos de Monterey, Mission West, Garfield Park and Raymond Hill. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.
What does an ADU or addition cost in South Pasadena?
Detached ADU: generally $150,000 to $400,000+ across Southern California. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.
How long does an ADU take start to finish?
Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.
Is a garage conversion cheaper than a detached ADU?
Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.
Can I rent the ADU out?
California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.
Do you handle the permits?
Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.
More Services in South Pasadena
Pool & Spa Remodeling in South Pasadena Backyard & Outdoor Living in South Pasadena Kitchen, Bath & Interior Remodeling in South Pasadena Plans, Permits & Design in South Pasadena Everything we build in South Pasadena
ADUs & Additions Nearby
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Planning Guides
Before You Build in South Pasadena
Costs, materials and process notes from our own projects.
ADU Cost Breakdown by Size in Los Angeles A detached ADU in Los Angeles runs $150,000 to $400,000-plus. Here is the real cost broken down by unit size, with the soft costs, utility work and finish decisions that move the number. Read guide Garage Conversion to ADU: The Step-by-Step Build A garage conversion runs $80,000 to $180,000 in Southern California. Here is the real sequence, from slab testing and plan check to the raised floor, the mini-split and final sign-off. Read guide ADU Rental Income Math in the San Fernando Valley A one-bedroom ADU in the San Fernando Valley rents for roughly $2,100 to $2,900 a month. Here is the honest arithmetic on payback, carrying costs and what the unit adds to the property. Read guide Second Story Addition vs Building Out: Which Costs Less Building out runs $350 to $500 per square foot. Going up runs $450 to $700. Here is when the cheaper option is actually the wrong one, and what drives each number. Read guide
Planning an ADU in South Pasadena?
Sit down with your project manager and get an accurate estimate. We call you back within one business day.
Book a Consultation 818-300-2393
Licensed, bonded & insured · CSLB license #1119054
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