# ADU Builder & Home Additions in Hermosa Beach, CA [Browser-friendly HTML version](https://www.remodelyourvibe.com/website-guide/pages/services/adus-additions/hermosa-beach/index) Source: https://www.remodelyourvibe.com/services/adus-additions/hermosa-beach 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/manhattan-beach/index.txt) | [Next page](https://www.remodelyourvibe.com/llms/pages/services/adus-additions/redondo-beach/index.txt) --- Image: Open-plan living room and kitchen with polished concrete floors 1. [Home](https://www.remodelyourvibe.com/) 1. [Services](https://www.remodelyourvibe.com/services) 1. [ADUs & Additions](https://www.remodelyourvibe.com/services/adus-additions) 1. Hermosa Beach Design · Permit · Build ### ADUs & Additions in Hermosa Beach 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 Hermosa Beach Homes The coastal step here is different from the neighbors', and it catches people out. Because the City's Local Coastal Program is not fully certified, Coastal Development Permits are handled through the California Coastal Commission's South Coast District after the City approves the project in concept: a second agency, not just a second counter. We build that into the plan, along with the reality that most lots near the beach are narrow. Predominantly narrow rectangular lots with compact rear yards near the beach, and larger, more conventional parcels farther east. 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 Hermosa Beach: Building permits, plan check and inspections come from the Building and Safety Division within the City's Community Development Department, with zoning review handled by the Planning Division. In the Coastal Zone a Coastal Development Permit is required in addition to the building permit, and those permits are processed through the California Coastal Commission's South Coast District after the City has approved a project in concept. Common triggers include new development, increases in floor area or height beyond ten percent, intensification of use, and work affecting coastal resources or a site with a prior coastal permit. Duration varies with the scope and the coastal review path. Permit details checked September 2026 against [California Coastal Commission](https://documents.coastal.ca.gov/assets/rflg/LCPStatusSummaryChart.pdf) . Rules change, so we confirm them again for your parcel. What We Build - Coastal Commission permit coordination - Narrow-lot and alley-access construction planning - Corrosion-resistant equipment specification - 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 Hermosa Beach These local conditions change the scope, the schedule and the budget. 01 Beach-side parcels sit on deep sand, so excavation for a pool, spa or subterranean level needs shoring and a soils-driven foundation approach rather than a standard footing. 02 Many lots are narrow, with alley-only or walk-street access, which caps equipment size and forces off-site material staging. 03 The bluff separating the flats from the east side produces steep rear yards where retaining and drainage carry a large share of the budget. 04 Ocean exposure accelerates corrosion on pool equipment, hardware and metal railings within a few blocks of the water, which changes what is worth specifying. Areas we serve in Hermosa Beach:The StrandDowntown Investment #### What It Costs in Hermosa Beach 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 Hermosa Beach property](https://www.remodelyourvibe.com/contact-us) The Process #### How We Work in Hermosa Beach 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 Hermosa Beach that submittal goes to City of Hermosa Beach Community 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 Hermosa Beach Homeowners Ask Who issues the permits for this work in Hermosa Beach? City of Hermosa Beach Community Development Department, Building and Safety Division. Building permits, plan check and inspections come from the Building and Safety Division within the City's Community Development Department, with zoning review handled by the Planning Division. In the Coastal Zone a Coastal Development Permit is required in addition to the building permit, and those permits are processed through the California Coastal Commission's South Coast District after the City has approved a project in concept. Common triggers include new development, increases in floor area or height beyond ten percent, intensification of use, and work affecting coastal resources or a site with a prior coastal permit. Duration varies with the scope and the coastal review path. 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 Hermosa Beach different? Predominantly narrow rectangular lots with compact rear yards near the beach, and larger, more conventional parcels farther east. One local condition that shapes the work: Beach-side parcels sit on deep sand, so excavation for a pool, spa or subterranean level needs shoring and a soils-driven foundation approach rather than a standard footing. Which parts of Hermosa Beach do you work in? All of it, including The Strand and Downtown. 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 Hermosa Beach? 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 Hermosa Beach [Pool & Spa Remodeling in Hermosa Beach](https://www.remodelyourvibe.com/services/swimming-pool-spa/hermosa-beach) [Backyard & Outdoor Living in Hermosa Beach](https://www.remodelyourvibe.com/services/exterior-remodeling/hermosa-beach) [Everything we build in Hermosa Beach](https://www.remodelyourvibe.com/service-areas/hermosa-beach) #### ADUs & Additions Nearby [ADUs & Additions in Manhattan Beach](https://www.remodelyourvibe.com/services/adus-additions/manhattan-beach) [ADUs & Additions in Redondo Beach](https://www.remodelyourvibe.com/services/adus-additions/redondo-beach) [ADUs & Additions in Torrance](https://www.remodelyourvibe.com/services/adus-additions/torrance) [ADUs & Additions in Palos Verdes Estates](https://www.remodelyourvibe.com/services/adus-additions/palos-verdes-estates) Planning Guides #### Before You Build in Hermosa Beach 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 Hermosa Beach? 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.