ADU Builder & Home Additions in Hacienda Heights, CA
Source: https://www.remodelyourvibe.com/services/adus-additions/hacienda-heights
Last modified: 2026-09-24T00:00:00.000Z
Text part: 1 of 1
Full website text index | Services by city | Previous page | Next page
Image: Detached backyard ADU with wood siding and black-framed glass doors at dusk
- Hacienda Heights
Design · Permit · Build
ADUs & Additions in Hacienda Heights
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Hacienda Heights Homes
Hacienda Heights spent most of the first half of the 20th century as citrus, walnut and avocado country, and it was called North Whittier Heights until 1961. Subdivisions began around Kwis Avenue in the early 1950s, and the post-war building boom edged out the orchards in favor of the single-family neighborhoods that define it today.
It remains unincorporated, with no city hall, so Los Angeles County handles its planning and building permits. Its southern edge rises into the Puente Hills, and the County counts views of those hills and the San Gabriel Mountains among the community's primary assets.
On the hillside lots, fire zone status, slope and distance from a mapped Significant Ridgeline come ahead of any conversation about finishes.
Mostly single-family homes from the post-war suburban boom, many set on inward-facing, non-connecting streets and cul-de-sacs. Toward the south and on the western slopes, the ground rises past 25 percent slope into the Puente Hills, where ridgeline, fire and hillside rules begin to shape what fits on a lot.
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 Hacienda Heights: Hacienda Heights is unincorporated, so building permits come from Los Angeles County Public Works, Building and Safety, through its La Puente District Office, and when Fire Department plan approval is required, building plans for the community go to the Diamond Bar Fire Prevention office.
The office's agency referral sheet flags hillside development on slopes of 25 percent or more for drainage plan check covering stormwater (NPDES and Low Impact Development) compliance, and where grading plan check applies, rough-grade approval is required before the building permit issues.
Zoning falls under the East San Gabriel Valley Planning Area Standards District (Title 22, Chapter 22.366), effective June 20, 2024, which keeps the highest point of a structure at least 50 vertical feet and 50 horizontal feet from a designated Significant Ridgeline, bars any part of a structure from blocking the view of one from a designated Scenic Route, and requires a Variance where a lot cannot meet those standards.
Permit details checked September 2026 against LA County Public Works and LA County Planning . Rules change, so we confirm them again for your parcel.
What We Build
- Significant Ridgeline setback planning
- Hillside drainage and rough-grade approvals
- Geotechnical review for steep lots
- Fire hazard zone exterior detailing
- Landfill-proximity methane review
- 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 Hacienda Heights
These local conditions change the scope, the schedule and the budget.
01
County planning for the East San Gabriel Valley Area Plan places many portions of Hacienda Heights within Very High Fire Hazard Severity Zones and Hillside Management Areas, along some 25 miles of wildland-urban interface around the Puente Hills.
02
Ground above 25 percent slope runs through the southern part of the community and the western slopes around the Puente Hills Landfill site, and County plan check routes any structure within 1,000 feet of a landfill to methane and contaminated-soil review.
03
Slope stability, over-steepened slopes, landslide risk and retaining walls on steep lots are referred to the County's Geotechnical and Materials Engineering Division for geology and soils approval, and the community's 2011 plan records a landslide among its difficulties in the 1980s and 1990s.
04
The Puente Hills are largely designated as part of the Puente Hills Significant Ecological Area, and much of the southern hillside area is federally designated critical habitat for the California coastal gnatcatcher, so native coastal sage scrub at the edge of a hillside lot is a planning question as well as a landscaping one.
Areas we serve in Hacienda Heights:Turnbull CanyonCamino del SurKwis Avenue
Investment
What It Costs in Hacienda Heights
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 Hacienda Heights property
The Process
How We Work in Hacienda Heights
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 Hacienda Heights that submittal goes to Los Angeles County Public Works, Building and Safety Division (La Puente District Office).
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 Hacienda Heights Homeowners Ask
Who issues the permits for this work in Hacienda Heights?
Los Angeles County Public Works, Building and Safety Division (La Puente District Office). Hacienda Heights is unincorporated, so building permits come from Los Angeles County Public Works, Building and Safety, through its La Puente District Office, and when Fire Department plan approval is required, building plans for the community go to the Diamond Bar Fire Prevention office.
The office's agency referral sheet flags hillside development on slopes of 25 percent or more for drainage plan check covering stormwater (NPDES and Low Impact Development) compliance, and where grading plan check applies, rough-grade approval is required before the building permit issues.
Zoning falls under the East San Gabriel Valley Planning Area Standards District (Title 22, Chapter 22.366), effective June 20, 2024, which keeps the highest point of a structure at least 50 vertical feet and 50 horizontal feet from a designated Significant Ridgeline, bars any part of a structure from blocking the view of one from a designated Scenic Route, and requires a Variance where a lot cannot meet those standards.
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 Hacienda Heights different?
Mostly single-family homes from the post-war suburban boom, many set on inward-facing, non-connecting streets and cul-de-sacs. Toward the south and on the western slopes, the ground rises past 25 percent slope into the Puente Hills, where ridgeline, fire and hillside rules begin to shape what fits on a lot.
One local condition that shapes the work: County planning for the East San Gabriel Valley Area Plan places many portions of Hacienda Heights within Very High Fire Hazard Severity Zones and Hillside Management Areas, along some 25 miles of wildland-urban interface around the Puente Hills.
Which parts of Hacienda Heights do you work in?
All of it, including Turnbull Canyon, Camino del Sur and Kwis Avenue. 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 Hacienda Heights?
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 Hacienda Heights
Pool & Spa Remodeling in Hacienda Heights Backyard & Outdoor Living in Hacienda Heights Everything we build in Hacienda Heights
ADUs & Additions Nearby
ADUs & Additions in Rowland Heights ADUs & Additions in Whittier ADUs & Additions in La Habra Heights ADUs & Additions in Diamond Bar ADUs & Additions in Yorba Linda
Planning Guides
Before You Build in Hacienda Heights
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 Hacienda Heights?
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
End of text part 1 of 1. This page is complete.