800 Sq Ft ADU Floor Plan
CSLB licence #999603 · Licensed and bonded · Design, permits and construction under one contract
What The 800 Sq Ft Layout Includes
Two bedrooms and two bathrooms inside one detached footprint. This is the published room list for the 800 sq ft ADU model — your final drawings are prepared for your own lot.
Two bedrooms
Two separate bedrooms rather than one, which is what makes this model work for a family member, a lodger, or a two-person household.
Two bathrooms
A second full bathroom means neither bedroom has to share, and it is the difference between a guest suite and a genuinely independent home.
Comfortable living space
The remaining floor area is given to a single open living and kitchen space rather than carved into corridors.
Detached, 800 sq ft
A standalone unit on the same lot as the main house, with its own entrance, utilities and address.
Two-bedroom rental potential
Two bedrooms and two bathrooms widen the pool of tenants compared with a studio or one-bedroom unit.
One level
The plan sits on a single storey, which keeps the structure simpler and avoids a staircase taking floor area.
Inside A Finished Granada Hills ADU
An aerial pass over the completed unit, before-and-after footage of the lot, and a conversation filmed in the finished kitchen. This is a different project from the floor plan on this page — it is here so you can see the standard of build and finish.
Finished ADU Work
Photographs from our completed Los Alimos ADU. It is a different build from the 800 sq ft ADU plan above, shown here for the standard of cabinetry, tile and joinery.
Kitchen with breakfast island
Los Alimos ADU
Bedroom
Los Alimos ADU
Bathroom with walk-in shower
Los Alimos ADU
Kitchen run and counters
Los Alimos ADU
Finished interior
Los Alimos ADU
Laundry and bedroom
Los Alimos ADU
Rear elevation and patio
Los Alimos ADU
Exterior with patio
Los Alimos ADU
Exterior elevation
Los Alimos ADU
Planning An 800 Sq Ft ADU
Two Bathrooms Change The Plumbing
A second bathroom adds drainage runs, venting and hot water demand. Where those lines can reach your existing sewer connection often decides where the bedrooms and bathrooms sit, so the published layout can shift once we survey the lot.
Permitting Runs On The City’s Clock
Plan check is handled by your local building department, not by us. Across Southern California jurisdictions permit review commonly takes six to fourteen weeks. We prepare and file the drawings, structural calculations and Title 24 packet, then manage the corrections.
We Do Not Publish Menu Pricing
Two 800 sq ft ADUs on different lots can differ substantially once utility runs, foundations, finishes and site access are counted. You get a written scope and a fixed proposal after we have walked the property, not a per-square-foot guess beforehand.
Questions About This Model
Is 800 sq ft the maximum ADU size in California?
No. State law sets minimum sizes that local agencies must allow, and many jurisdictions permit larger detached units. What your specific parcel allows depends on your city, your zoning and your lot, which we check before drawing anything.
Can the 800 sq ft ADU layout be changed?
Yes. The published plan is a starting point. Room sizes and positions are adjusted to suit your lot, your setbacks and how you intend to use the unit, then redrawn before anything is filed with the city.
How long does a detached ADU take to build?
Our stated range for detached ADU construction is five to eight months on site, after design and permitting are complete. Permit review itself commonly adds six to fourteen weeks depending on the jurisdiction.
What does an 800 sq ft ADU cost?
We do not publish per-square-foot pricing, because utility tie-in distance, foundation requirements, site access and finish level move the number significantly between properties. You receive a written scope and a fixed proposal after a site visit.
Do you handle the drawings and the permits as well as the build?
Yes. Design, structural engineering, Title 24 calculations, permit filing and construction all sit under a single contract with one licensed general contractor, so there is no handover between separate firms.
Request This Floor Plan
Tell us your address and we will check what an 800 sq ft ADU can do on your lot, walk the property and put a written scope in front of you before any drawings are paid for.
Homeowner Experiences
Hear directly from Southern California clients who trusted H&A My Design with their custom homes, ADUs, and additions.
Walk the finished home — navy kitchen with brass fittings, an open living space and a new double-vanity bathroom.
“We’re extremely happy with the results. Without a shadow of doubt, we’ve already recommended them to other neighbors.”
“Everybody was phenomenal to work with, a pleasure to have. Totally fair and wonderful company and great family.”
“H&A made the entire process transparent. Having one GC manage blueprints, city permits, and the build was night and day.”
“Their Canoga Park showroom made selecting our cabinets, quartz, and fixtures so easy. Finished right on schedule.”
“Converted our garage into a 2-bedroom rental. Flawless craftsmanship and leased immediately after final inspection.”
See the full before and after — the original kitchen, the opened-up living space and the finished bathrooms.
“From 3D plans to final city sign-off, H&A handled everything. No surprise change orders, no stress.”
“Built a modern ADU for my parents. The accessibility and aesthetic details exceeded all our expectations.”
Serving Southern California
Licensed throughout Los Angeles & Ventura Counties. HQ Showroom at 6723 Variel Ave, Canoga Park, CA.
MORE SPACE.
MORE VALUE.
Design, permits, showroom selections, and master construction—managed by one accountable team.