Solid ADU
Attached ADU in Mount Washington and nearby
Thinking about an attached ADU in Mount Washington? Solid ADU guides you from first advice to final inspection. Call now or request a free callback.
- One point of contact from first idea to final inspection
- Built by vetted, CSLB-licensed contractors from our network
- Compare clear fixed proposals before construction starts
No obligation · Response within 24 hours · Your details are only used to contact you.
- [YEARS] years of experience
- [PROJECTS]+ completed projects
- Response within 24 hours
- Free feasibility check
- Vetted, CSLB-licensed contractors
Do you own a home in Mount Washington and are you considering an attached ADU? Then you are in the right place. Solid ADU guides these projects throughout Mount Washington and also in Highland Park, Glassell Park, Cypress Park and Montecito Heights, and matches you with a vetted licensed contractor who does the building.
Mount Washington is the hill at the heart of the Eastside, known for winding streets, canyon views and a housing mix that ranges from early 1900s bungalows near the old incline railway route to midcentury and architect-built hillside homes. Most lots slope, and many garages sit at street level with the house above or below, which often makes the garage the most buildable spot on the entire property. A conversion there avoids major grading while adding a guest house, studio or rental with its own entrance. Hillside work does raise real questions about foundations, retaining walls and drainage, so our free feasibility check looks at those first and tells you honestly what the lot supports. Every project is permitted and inspected through LADBS, including the structural review hillside construction requires. Think of midcentury hillside homes, early 1900s bungalows, architect-built view homes and street-level hillside garages: we tailor the approach to the type of home and the condition of your lot and existing structures.
An attached ADU (Accessory Dwelling Unit) is a complete, self-contained home that shares at least one wall with your main house. It has its own entrance, kitchen, bathroom and living space, so it can be rented out or used by family while everyone keeps their privacy. You can build it as a new addition on the side or rear of your house, or convert an existing part of your home, such as a rear wing or an oversized family room, into a separate unit.
There is no pressure to decide right away. We first discuss your plans free of charge, check feasibility for your lot, and then match you with a vetted licensed contractor who sends you a detailed fixed proposal. That way you know exactly where you stand before you commit to anything.
Want to know what is possible on your Mount Washington lot?
Call now or leave your phone number. We walk through your situation for free, with no obligation.
Attached ADU in Mount Washington: what is possible
Free feasibility check
We review your lot, existing structure, setbacks and utility locations, and tell you what size and layout of attached ADU is realistic before you spend anything on design.
Design and floor plans
We help you shape the unit around how it will be used: rental, family housing or home office with living space. You review the layout and finishes before anything moves toward permitting.
LADBS plan check and permits
Your contractor's team prepares the full plan set with structural, Title 24 energy and site documents and submits it to LADBS plan check. We guide you through the process, track corrections and keep the application moving through to permit issuance.
Connecting to the existing structure
An addition has to carry its own loads and tie cleanly into your house. Your contractor handles the foundation, framing and roof connection so the new unit and the existing structure work together, verified by inspection.
Converting part of your home
Instead of building new, your contractor can turn an existing section of the house into the ADU: closing interior openings, adding the separate entrance and upgrading the space to full dwelling standards.
Private entrance
Every ADU needs its own exterior entrance. The plans place it for privacy on both sides, with its own path, address marking and lighting, so tenants never walk through your space.
Fire and sound separation
The wall and any floor or ceiling between the units are built as rated assemblies: layers of fire-resistant drywall, insulation and sealed penetrations that slow fire spread and block everyday noise.
Plumbing, electrical and HVAC
Your contractor runs new supply, drain and electrical lines, adds or extends panels where needed, and installs efficient heating and cooling, typically a ductless mini-split, sized for the unit.
Kitchen and bathroom build-out
A full kitchen and bathroom are what make it a dwelling. Your contractor builds both complete: cabinets, counters, appliances, fixtures, waterproofing and tile.
You can find the full overview on our attached ADU page.
Why invest in an attached ADU?
Most homeowners we talk to want the extra space or rental income but get stuck on the same points. Recognize any of these?
- You are not sure whether your lot even qualifies for an attached ADU, or how big it could be.
- You need rental income or space for family, but a detached backyard unit does not fit your lot.
- The permit process feels like a black box: plan check, corrections, inspections, all with their own rules.
- You have talked to an architect and a contractor separately and got two stories that do not line up.
- You do not know how to vet a contractor, or which quote you can actually trust.
- You worry the addition will look bolted on and hurt the value of your home.
What happens after you reach out
- 1
Free feasibility check
Call us or leave your number, and we respond within 24 hours. We look at your lot, your garage or backyard, and your utilities, and we talk through what you want: rental income, space for family, or a home office. You get an honest picture of what is possible before you spend anything.
- 2
Matched with the right contractor
We match you with vetted, CSLB-licensed contractors from our network whose track record fits your type of ADU, your lot and your budget. We verify licenses, insurance and past work, so you do not have to.
- 3
Compare clear fixed proposals
You receive clear fixed proposals with the scope, schedule and price spelled out. No fine print and no surprise costs. You compare, ask us anything, and pick the contractor you feel confident with, at your own pace.
- 4
Plans and LADBS permits
Your contractor's team prepares the complete permit set: architectural plans, structural calculations and the energy compliance documents California requires. We guide you through the LADBS permit process and keep you posted on plan check and corrections. Nothing is submitted until you approve the design.
- 5
Your contractor builds, we stay involved
Your licensed contractor builds your ADU and schedules every required city inspection along the way. We stay involved as your single point of contact, so you always know where things stand.
Attached ADU costs in Mount Washington
What an attached ADU costs depends heavily on the route you take. Converting an existing part of the house that already has a roof and slab is a different project from building a new addition with its own foundation. That is why you will not find standard prices here: for your situation they would almost always be too high or too low.
- New addition or conversion of existing space
- The size and layout of the unit (studio, one or two bedrooms)
- Foundation and structural work needed to tie into the existing house
- The condition of the existing structure, slab and roof at the connection point
- How far water, sewer and electrical lines must be extended, and whether the panel needs upgrading
- The fire and sound separation assemblies between the two units
- Kitchen and bathroom scope and the finish level you choose
- Matching the exterior: stucco, siding, roofing and windows
Get a free feasibility check for your project
Leave your phone number and we will call you back within 24 hours.
A project nearby: Highland Park
A licensed contractor from our network completed this project in Highland Park, in the same part of Los Angeles as Mount Washington.
Want a similar result on your property?
Talk your project through with us. Free, and with no strings attached.
Also serving the area around Mount Washington
We also guide attached ADU projects in Highland Park, Glassell Park, Cypress Park, Montecito Heights and the rest of Eastside.
Frequently asked questions about attached ADU in Mount Washington
How soon can you start in Mount Washington?
That depends on your contractor's schedule, the size of your project and the LADBS plan review, which we guide you through. After your request we contact you within 24 hours and map out a realistic timeline right away.
Do you serve all of Mount Washington?
Yes, our network covers all of Mount Washington and also nearby neighborhoods such as Highland Park, Glassell Park, Cypress Park and Montecito Heights. Not sure whether your address falls within our service area? Just call and you will know right away.
Is my request really no-obligation?
Yes. A phone consultation, a site visit and a feasibility check never commit you to anything. You decide if and when you want to move forward.
Do you also work in the area around Mount Washington?
Absolutely, including in Highland Park, Glassell Park, Cypress Park and Montecito Heights. Take a look at our service areas page for every neighborhood we cover.
What does an attached ADU cost in Mount Washington?
That depends on factors such as the size of the project, the condition of the existing structure and the finishes you choose. That is why there are no standard prices. Leave your phone number and you will receive a free feasibility check, followed by a detailed fixed proposal from a vetted licensed contractor.
Do I need to know exactly what I want?
No. You do not need to have chosen a layout, materials or finishes yet. During a free consultation we walk through the options and help you decide what fits your property and your goals.
Ready for your attached ADU in Mount Washington?
Call now or leave your name and phone number. We discuss your project with no obligation and you hear from us within 24 hours.
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