Hero video loop, 12s, muted, 1920×1080, finished Encino whole-home exterior at golden hour, slow dolly
Design-Build General Contractor in Los Angeles
One builder,from plans to final.
Remodels, room additions, ADUs and ground-up homes across the San Fernando Valley and the Westside. We handle the design, engineering, permits and construction under one contract.
Sherman Oaks ADU, exteriorKitchen and livingBathroomBedroomBedroom, natural light
What We Build
One contract. Design, permits, engineering and construction.
You deal with one builder for the drawings, plan check, the trades and the materials, and you get a written scope and quote for your address before you commit.
Every project is priced after a free site visit, with a written scope and quote for your address. We tell you which line items move yours, and why.
Before You Ask Anyone for a Bid
Find out what your lot can actually hold.
Enter your address and we'll send a written feasibility snapshot: zoning, setbacks, buildable footprint, the likely permit path, and the line items that drive the cost. Free, and yours to take to any contractor.
Parcel zoning, overlays and hillside / fire-zone status
Maximum ADU size and setback envelope under current state law
The line items that drive the cost of your project
Our Work · Encino ADU, south of the Boulevard
From bare lot to finished ADU in Encino.
Here is a backyard ADU we built in Encino, from the first stakes in the dirt to the finished kitchen.
Kitchen, finishedWaterfall peninsulaBathroom with tubWalk-in shower
How we built it
Swipe →
01Demo
02Site layout from the plans
03Footing forms and rebar
04Slab poured, anchors set
05Walls framed
06Plywood sheathing
07Roof on, lath wrapped
08Stucco base coat
09Insulation in
10Drywall taped and mudded
The Process
Five stages, from the site visit to handover.
Here is the order the work happens in, and what you get from us at each stage.
01
Consultation & Feasibility
We walk the property, pull parcel and zoning data, and tell you whether the project you want fits the lot and the budget.
Week 1
02
Design & Written Proposal
Architectural drawings, structural engineering, Title 24 calcs and material selections, priced line by line before a single permit is filed.
Weeks 2 to 8
03
Permitting
We file the plans, see them through plan check and answer the corrections.
Weeks 6 to 20
04
Construction
One project manager runs the job. You get a written update with photos every week, and each inspection is booked when the work is ready for it.
Per scope
05
Handover & Warranty
Final inspection sign-off, a punch walk with you, and a closeout package with the permits and as-builts.
Ongoing
How We Work
The Mamos Standard
Three things we put in writing in every contract.
A written proposal, line by line
You see allowances, unit costs and exclusions before you sign. If something turns up behind a wall, you get a priced, written change order to approve before that work starts.
Permits pulled in our name
If a contractor asks you to pull the owner-builder permit yourself, they are moving liability onto you. We pull it, we carry it, and we meet the inspector.
Priced after a site visit
Allowances and finishes are set with you, on site, after we have walked the property.
Verify Us Before You Call Us
CSLB License #1092889 is active, bonded and insured.
The State of California publishes our license status, bond, workers' compensation coverage and complaint history at cslb.ca.gov.
Every project starts with a free visit, at your place.
The cost comes from your scope, your lot and the finishes you pick. At the visit we show you which line items move it, and you get the written scope before you commit to anything. Book your free visit.
Scope
What decides it
Kitchen, full gut
Moving plumbing or gas, structural openings, cabinetry tier, slab selection
Bathroom remodel
Curbless shower, slab walls vs. tile, relocating the toilet stack
Room addition
Foundation type, whether the roof line has to change, panel upgrade
Detached ADU (400 to 600 sq ft)
Utility trenching distance, site access for equipment
Garage conversion ADU
Existing slab and footing condition, egress, fire separation
Whole-home renovation
Full MEP replacement, structural retrofit, envelope and landscape scope
Ground-up custom home
Hillside vs. flat, grading and shoring, level of finish and millwork
Clients
What our clients wrote after the job.
Quoted word for word from Google, Yelp and Houzz, each linked to the original.
“I’m extremely happy with the work Mamos Construction & Design did on our home. They completed a full renovation throughout the house, along with several additions, and the results came out amazing.”
“Hiring Mamos Construction & Design was the best decision I could’ve made. They were so professional and on time. The work crew was awesome and very polite.”
We ask every client for a review, not just the happy ones. If something went wrong, we would rather hear it from you first, so call (818) 934-0075 or use the form. Either way, post publicly too.
Thank you.
We will verify it against our project records and publish it within a day or two.
Where We Build
The Valley, the Westside and beyond.
The neighborhoods and cities we work in. Where we have a local page, the name links to it.
How much does an ADU cost in Los Angeles right now?
It comes down to three things: how far utilities have to be trenched, whether the site is accessible to equipment, and your finish level. We walk you through all three at the free consultation, so you know where your project lands before you decide anything.
Can I sell my ADU separately from my house?
Not in the City or County of Los Angeles. AB 1033 allows cities to opt in to separate ADU condo sales, but LA has not adopted it. A handful of California cities have. If separate sale is central to your plan, tell us at the consultation. It changes what we'd recommend building.
How long does permitting take?
Plan on 3 to 6 months through plan check with corrections. Additions and whole-home work vary widely with structural scope and whether the property is in a hillside or fire hazard zone. We give you a jurisdiction-specific estimate at feasibility, not a generic one.
Do you handle fire rebuilds in the Palisades and Altadena?
Yes. Rebuilds in wildfire zones trigger Chapter 7A requirements: ignition-resistant exteriors, ember-resistant vents, Class A roofing and tempered glazing. The City of LA's expanded self-certification pathway has cut approval times substantially for Palisades rebuilds. We'll tell you at feasibility whether a like-for-like rebuild or a redesign gets you into the house faster.
Are you licensed, bonded and insured?
CSLB License #1092889, active, with a contractor's bond, general liability and workers' compensation coverage. You can confirm all of it, including any complaint history, directly with the State at cslb.ca.gov. We'd rather you checked.
Photo: project manager with clients on site, warm daylight
Start Here
Let's find out if this is a fit.
We walk the property with you, go over the scope and the budget, and tell you at the visit whether we are the right builder for the job.
Photo: completed Taj Mahal quartzite island kitchen, Encino
Photo: Dekton book-matched primary bath, wall-hung fixtures
Photo: whole-home renovation, before / after pair
Photo: detached 800 sq ft ADU, Sherman Oaks, exterior + interior
Photo: second-story addition framed and finished, Studio City
Photo: ground-up custom home, hillside, San Gabriel ridgeline backdrop
Photo: project manager with clients on site, warm daylight