# ADU Builder & Home Additions in West Hills, CA [Browser-friendly HTML version](https://www.remodelyourvibe.com/website-guide/pages/services/adus-additions/west-hills/index) Source: https://www.remodelyourvibe.com/services/adus-additions/west-hills Last modified: 2026-09-24T00:00:00.000Z Text part: 1 of 1 [Full website text index](https://www.remodelyourvibe.com/llms-full.txt) | [Services by city](https://www.remodelyourvibe.com/llms/services-by-city-006.txt) | [Previous page](https://www.remodelyourvibe.com/llms/pages/services/adus-additions/reseda/index.txt) | [Next page](https://www.remodelyourvibe.com/llms/pages/services/adus-additions/valley-village/index.txt) --- Image: Detached backyard ADU with wood siding and black-framed glass doors at dusk 1. [Home](https://www.remodelyourvibe.com/) 1. [Services](https://www.remodelyourvibe.com/services) 1. [ADUs & Additions](https://www.remodelyourvibe.com/services/adus-additions) 1. West Hills Design · Permit · Build ### ADUs & Additions in West Hills Detached ADUs, garage conversions and additions, from plans to move-in. [Book a Consultation](https://www.remodelyourvibe.com/contact-us) [Call 818-300-2393](tel:+18183002393) #### Built for West Hills Homes On the west edge of the Valley, the Simi Hills push right up against the neighborhoods, and that proximity drives most of what we plan for here. Properties along Valley Circle and the canyon streets sit in fire hazard territory with real brush clearance obligations, sloping rear yards, and oak canopy that triggers protected-tree review. Farther east the ground flattens into conventional tracts, and the job becomes a straightforward yard build. Parcels run from flat tract lots on the east side to larger sloping properties toward the hills, several of which back directly onto open space and natural brush. 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](https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=1119054) . Permits in West Hills: LADBS issues residential building, grading and pool permits here under the Canoga Park-Winnetka-Woodland Hills-West Hills Community Plan. Plan check runs through the Van Nuys Development Services Center, and LADBS also runs a West Valley inspection office at 19040 Vanowen Street in Reseda. Properties along the western edge toward the Simi Hills fall inside Very High Fire Hazard Severity Zone mapping, which brings LAFD brush clearance requirements and California Building Code Chapter 7A ignition-resistant construction standards. CAL FIRE issued recommended Local Responsibility Area maps on March 24, 2025, which state law requires the City to adopt by ordinance. Sloping parcels can also fall in the city's designated hillside area under the Baseline Hillside Ordinance (No. 184,802), which limits floor area, envelope height and grading quantities. Oak and western sycamore are widespread on the canyon-side lots and are protected at four cumulative inches of trunk diameter, requiring an Urban Forestry permit before removal or encroachment. Permit details checked September 2026 against [LADBS](https://dbs.lacity.gov/sites/default/files/efs/forms/pc17/design-and-construction-of-swimming-pools-ib-p-bc2017-014.pdf) and [LAFD](https://lafd.org/fire-prevention/brush/brush-clearance-requirements) . Rules change, so we confirm them again for your parcel. What We Build - Fire-hardened outdoor structures and hardscape - Slope retaining and drainage engineering - Protected oak root-zone planning - 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 West Hills These local conditions change the scope, the schedule and the budget. 01 Rear yards on the canyon side slope toward natural drainage courses, so retaining walls, subdrains and erosion control usually come before any finished surface goes in. 02 Shallow sandstone and cobble in the western foothills slows excavation and can force a redesign of shell depth or footing layout once a probe is done. 03 Santa Ana wind exposure and ember drift favor noncombustible decking, enclosed eaves, ember-resistant vents and hardscape in the immediate zone around structures. 04 Established oak canopy shades much of the older housing stock, limiting solar siting and constraining excavator routing around protected root zones. Areas we serve in West Hills:Shadow RanchPlatt RanchOrcutt Ranch Investment #### What It Costs in West Hills 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 West Hills property](https://www.remodelyourvibe.com/contact-us) The Process #### How We Work in West Hills 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 West Hills that submittal goes to Los Angeles Department of Building and Safety (LADBS). 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 West Hills Homeowners Ask Who issues the permits for this work in West Hills? Los Angeles Department of Building and Safety (LADBS). LADBS issues residential building, grading and pool permits here under the Canoga Park-Winnetka-Woodland Hills-West Hills Community Plan. Plan check runs through the Van Nuys Development Services Center, and LADBS also runs a West Valley inspection office at 19040 Vanowen Street in Reseda. Properties along the western edge toward the Simi Hills fall inside Very High Fire Hazard Severity Zone mapping, which brings LAFD brush clearance requirements and California Building Code Chapter 7A ignition-resistant construction standards. CAL FIRE issued recommended Local Responsibility Area maps on March 24, 2025, which state law requires the City to adopt by ordinance. Sloping parcels can also fall in the city's designated hillside area under the Baseline Hillside Ordinance (No. 184,802), which limits floor area, envelope height and grading quantities. Oak and western sycamore are widespread on the canyon-side lots and are protected at four cumulative inches of trunk diameter, requiring an Urban Forestry permit before removal or encroachment. 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 West Hills different? Parcels run from flat tract lots on the east side to larger sloping properties toward the hills, several of which back directly onto open space and natural brush. One local condition that shapes the work: Rear yards on the canyon side slope toward natural drainage courses, so retaining walls, subdrains and erosion control usually come before any finished surface goes in. Which parts of West Hills do you work in? All of it, including Shadow Ranch, Platt Ranch and Orcutt Ranch. 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 West Hills? 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 West Hills [Pool & Spa Remodeling in West Hills](https://www.remodelyourvibe.com/services/swimming-pool-spa/west-hills) [Backyard & Outdoor Living in West Hills](https://www.remodelyourvibe.com/services/exterior-remodeling/west-hills) [Kitchen, Bath & Interior Remodeling in West Hills](https://www.remodelyourvibe.com/services/interior-remodeling/west-hills) [Plans, Permits & Design in West Hills](https://www.remodelyourvibe.com/services/plans-permits/west-hills) [Everything we build in West Hills](https://www.remodelyourvibe.com/service-areas/west-hills) #### ADUs & Additions Nearby [ADUs & Additions in Canoga Park](https://www.remodelyourvibe.com/services/adus-additions/canoga-park) [ADUs & Additions in Chatsworth](https://www.remodelyourvibe.com/services/adus-additions/chatsworth) [ADUs & Additions in Woodland Hills](https://www.remodelyourvibe.com/services/adus-additions/woodland-hills) [ADUs & Additions in Hidden Hills](https://www.remodelyourvibe.com/services/adus-additions/hidden-hills) [ADUs & Additions in Calabasas](https://www.remodelyourvibe.com/services/adus-additions/calabasas) Planning Guides #### Before You Build in West Hills 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](https://www.remodelyourvibe.com/articles/adu-cost-breakdown-by-size-los-angeles) [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](https://www.remodelyourvibe.com/articles/garage-conversion-adu-step-by-step) [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](https://www.remodelyourvibe.com/articles/adu-rental-income-san-fernando-valley) [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](https://www.remodelyourvibe.com/articles/second-story-addition-vs-building-out) #### Planning an ADU in West Hills? Sit down with your project manager and get an accurate estimate. We call you back within one business day. [Book a Consultation](https://www.remodelyourvibe.com/contact-us) [818-300-2393](tel:+18183002393) Licensed, bonded & insured · [CSLB license #1119054](https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=1119054) --- End of text part 1 of 1. This page is complete.