ADU Builder & Home Additions in La Habra, CA
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Detached backyard ADU with wood siding and black-framed glass doors at dusk
- La Habra
Design · Permit · Build
ADUs & Additions in La Habra
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for La Habra Homes
La Habra's name, which the General Plan translates as a pass through the hills, goes back to the Portola expedition of 1769, and the city fills the basin between the Puente Hills to the north and the Coyote Hills to the south. Most of it is gently rolling valley floor on a street grid, where a backyard plan is shaped less by grade than by setbacks, the 1,000-square-foot usable yard rule and the ten feet a side-yard pool pump must keep from a neighbor's window.
The southwest corner reads differently: Westridge and the La Habra Hills Specific Plan area sit around the Westridge Golf Club on the southern hillsides, and the General Plan maps the land between the club and the city limits as a Very High Fire Hazard Severity Zone.
There, slope position, soils and ember exposure decide where a pool or a detached ADU can go.
In the R-1a, R-1b and R-1c single-unit zones the minimum lot area is 10,000, 7,200 and 5,500 square feet per home. Each home must also keep 1,000 square feet of usable yard, at least 15 feet across except for up to half of it at 12 feet, graded no steeper than five percent and free of parking, driveways and accessory buildings.
Up on the southern hillsides, the General Plan counts the area near Westridge among the wealthiest in La Habra.
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 La Habra: Plan check, permits and inspections run through the Building and Safety Division at 110 East La Habra Boulevard, and plans are submitted through the city's online portal. The division's pool handout asks owners to confirm usable yard area and setbacks with Planning, check easements with Engineering and, where a homeowners association exists, bring its approval in with the plans.
It keeps water at least five feet from side and rear property lines, requires a pre-site inspection approving the pool location before any excavation, and allows a pump and filter in a side yard only when they stay three feet from the house and ten feet from a neighbor's existing window or enclosed patio.
Under LHMC 18.12.150 a new detached ADU may reach 1,200 square feet with four-foot side and rear setbacks and ten feet of separation from any other building on the lot, and it must use the same roof style as the main house.
Permit details checked September 2026 against City of La Habra and La Habra Municipal Code . Rules change, so we confirm them again for your parcel.
What We Build
- Pool placement clear of slope tops and toes
- Expansive-soil pool shell engineering
- Side-yard equipment clearance to neighbors
- Ember-aware materials along the southern hillsides
- Rainy-season NPDES erosion controls
- 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 La Habra
These local conditions change the scope, the schedule and the budget.
01
The General Plan maps the city's southern section, between the Westridge Golf Club and the city limits, as a Very High Fire Hazard Severity Zone, so decks, vents and cladding near that edge are worth specifying with ember exposure in mind.
02
Landslide susceptibility is concentrated along the northern and southern edges of the city, and the Building and Safety Division requires a pool to sit at least seven feet from the top of a slope and five feet from its toe.
03
Every pool shell must follow an engineered design for expansive soils unless a registered engineer's soils report approved by the Building Official shows otherwise, and the liquefaction zones mapped in the south of the city along South Beach Boulevard and West Imperial Highway require a site investigation before development.
04
The General Plan associates the city's abandoned oil wells with the West Coyote Hills in the southern hillsides, with idle and dry-hole wells scattered through the south and west, so a deep pool excavation in that part of town is best preceded by a check of well records.
Areas we serve in La Habra:WestridgeLa Habra HillsNorth HillsDowntown La Habra
Investment
What It Costs in La Habra
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 La Habra property
The Process
How We Work in La Habra
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 La Habra that submittal goes to City of La Habra Community and Economic Development Department, Building and Safety 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 La Habra Homeowners Ask
Who issues the permits for this work in La Habra?
City of La Habra Community and Economic Development Department, Building and Safety Division. Plan check, permits and inspections run through the Building and Safety Division at 110 East La Habra Boulevard, and plans are submitted through the city's online portal.
The division's pool handout asks owners to confirm usable yard area and setbacks with Planning, check easements with Engineering and, where a homeowners association exists, bring its approval in with the plans. It keeps water at least five feet from side and rear property lines, requires a pre-site inspection approving the pool location before any excavation, and allows a pump and filter in a side yard only when they stay three feet from the house and ten feet from a neighbor's existing window or enclosed patio.
Under LHMC 18.12.150 a new detached ADU may reach 1,200 square feet with four-foot side and rear setbacks and ten feet of separation from any other building on the lot, and it must use the same roof style as the main house. 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 La Habra different?
In the R-1a, R-1b and R-1c single-unit zones the minimum lot area is 10,000, 7,200 and 5,500 square feet per home. Each home must also keep 1,000 square feet of usable yard, at least 15 feet across except for up to half of it at 12 feet, graded no steeper than five percent and free of parking, driveways and accessory buildings.
Up on the southern hillsides, the General Plan counts the area near Westridge among the wealthiest in La Habra. One local condition that shapes the work: The General Plan maps the city's southern section, between the Westridge Golf Club and the city limits, as a Very High Fire Hazard Severity Zone, so decks, vents and cladding near that edge are worth specifying with ember exposure in mind.
Which parts of La Habra do you work in?
All of it, including Westridge, La Habra Hills, North Hills and Downtown La Habra. 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 La Habra?
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 La Habra
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Planning Guides
Before You Build in La Habra
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 La Habra?
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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