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Licensed & Insured. CSLB #1092889 Serving Los Angeles County, Long Beach, Orange County, Oxnard & Pasadena Service Areas FAQ Client Support (818) 934-0075
MAMOS Construction & Design
Luxury modern California hillside home at golden hour with infinity pool
Hero video loop, 12s, muted, 1920×1080, finished Encino whole-home exterior at golden hour, slow dolly

Design-Build General Contractor in Los Angeles

Built to a standardyou can verify.

Luxury remodels, room additions, ADUs and ground-up homes across most of Los Angeles County, plus Long Beach, Orange County, Oxnard and Pasadena. Delivered on a fixed-price proposal, with design, engineering, permits and construction handled under one contract.

● Typical reply within one business day . No obligation . For home improvement contracts in California the down payment is capped at $1,000 or ten percent, whichever is less. We do not ask for more.

#1092889
CSLB License
Verify with the State ↗
25+
Years Building in CA
Fixed-Price
Proposal After Site Inspection
LA County & Beyond
Plus Long Beach, Orange County, Oxnard & Pasadena
Bonded & Insured Workers' Comp Carried LADBS Standard Plan Program

What We Build

One contract. Design, permits, engineering and construction.

You are not managing an architect, a plan-check expediter, three subs and a supplier. You are managing us, and we publish the range before you commit.

Modern kitchen with Taj Mahal quartzite waterfall island and matte black fittings
Photo: completed Taj Mahal quartzite island kitchen, Encino

Kitchen Remodeling

Full gut to finish: layout, structural openings, Title 24-compliant electrical and mechanical, stone fabrication and installation.

Starting at$15,900Explore
Primary bathroom with book-matched Dekton slab walls and curbless shower
Photo: Dekton book-matched primary bath, wall-hung fixtures

Bathroom Remodeling

Waterproofing done to code and documented, curbless showers, book-matched slab walls, and accessible / aging-in-place layouts.

Starting at$11,900Explore
Renovated great room with microcement walls and cedar board-and-batten accent
Photo: whole-home renovation, before / after pair

Whole-Home Renovation

Down to the studs and back up: structural, MEP replacement, envelope, finishes and landscape, phased so you know what happens each week.

Starting at$180,000Explore
Detached 800 square foot ADU in a San Fernando Valley backyard
Photo: detached 800 sq ft ADU, Sherman Oaks, exterior + interior

ADUs & Garage Conversions

Detached, attached and JADU. We run feasibility against your actual parcel, then use LADBS pre-approved standard plans where they shorten plan check.

Starting at$220 / sq ftExplore
Completed second-story addition matching the original architecture
Photo: second-story addition framed and finished, Studio City

Room Additions & Second Stories

Foundation and shear engineering, tie-in detailing, and a roof line that reads as original, not an addition bolted onto the back of the house.

Starting at$225 / sq ftExplore
Ground-up custom home on a Los Angeles hillside at blue hour
Photo: ground-up custom home, hillside, San Gabriel ridgeline backdrop

Custom Homes & Fire Rebuilds

Ground-up construction, hillside grading, and Chapter 7A-compliant rebuilds in wildfire zones, including LA's expedited self-certification pathway.

Starting at$375 / sq ftExplore

Starting prices are real floors from completed projects at our entry specification, not teaser numbers. We tell you at the first meeting 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 return a written feasibility snapshot: zoning, setbacks, buildable footprint, likely permit path, and a realistic budget band for your scope. 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
  • Whether an LADBS pre-approved standard plan fits, and how much plan-check time it saves
  • A budget band with the line items that actually move it

Step 1 of 3: Your property

Used only to pull public parcel and zoning data. Never shared.

The Process

Five stages. You always know which one you're in.

Most construction anxiety is not about quality. It's about not knowing what happens next. Here is what happens next.

01

Consultation & Feasibility

We walk the property, pull parcel and zoning data, and tell you plainly whether the project you want is possible at the budget you have.

Week 1

02

Design & Fixed-Price 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, we sit in plan check, we answer the corrections. Where an LADBS pre-approved standard plan fits, we use it and cut months out.

Weeks 6 to 20

04

Construction

One dedicated project manager, a weekly written update with photos, and a live schedule you can open on your phone. Inspections sequenced, not improvised.

Per scope

05

Handover & Warranty

Final inspection sign-off, a closeout package with permits, warranties and as-builts, and a punch walk with a written closeout package.

Ongoing

Risk, Removed

The Mamos Standard

Four commitments, in the contract, not in the brochure. Three of them are California law that most contractors quietly ignore.

Never more than 10% down

For home improvement contracts in California the down payment is capped at $1,000 or ten percent, whichever is less. We do not ask for more.

CSLB Home Improvement Contracts ↗

Fixed-price proposal, line by line

You see allowances, unit costs and exclusions before you sign. Anything genuinely unforeseeable gets a written change order with a price, approved before the work happens, never after.

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.

Fixed-price proposal

Issued after a site inspection, so the number holds. Allowances and finishes are set while we are standing on your property, not guessed at from a desk.

Verify Us Before You Call Us

CSLB License #1092889 is active, bonded and insured.

Don't take our word for it. The State of California publishes our license status, bond, workers' compensation coverage and complaint history. It takes about forty seconds.

Check Our License ↗

Where Projects Start

We publish where we start. Most contractors won't.

These are real starting prices for work built to code in the San Fernando Valley. Where your project lands above that depends on scope, site and specification, and we tell you exactly which line items move it.

ScopeStarting atWhat moves the number most
Kitchen, full gutfrom $45,000Moving plumbing or gas, structural openings, cabinetry tier, slab selection
Bathroom remodelfrom $22,000Curbless shower, slab walls vs. tile, relocating the toilet stack
Room additionfrom $225 / sq ftFoundation type, whether the roof line has to change, panel upgrade
Detached ADU (400 to 600 sq ft)from $149,000Utility trenching distance, standard plan vs. custom, site access for equipment
Garage conversion ADUfrom $85,000Existing slab and footing condition, egress, fire separation
Whole-home renovationfrom $180,000Full MEP replacement, structural retrofit, envelope and landscape scope
Ground-up custom homefrom $375 / sq ftHillside vs. flat, grading and shoring, level of finish and millwork

Starting prices reflect completed projects at our entry specification and exclude land, furniture, and permit or school fees paid directly to the jurisdiction. Figures shown are placeholders for this prototype and must be replaced with numbers you would actually sign a contract at.

Clients

Named. Local. Specific about what went right.

Every review below is verifiable on the platform it came from. We link out rather than retype.

“They found a beam issue on day three that two other bidders had missed entirely. It cost more, but they showed me the engineer's letter, wrote the change order, and the schedule never moved.”

DR
D. Rosen
Encino, Whole-home
Google
★★★★★

“The ADU rents for enough to cover most of our mortgage. What I remember most is that the weekly photo update never once skipped a week, even the week nothing happened.”

MK
M. & K. Tanaka
Sherman Oaks, Detached ADU
Yelp
★★★★★

“We interviewed four contractors. Mamos was the only one who told us what we wanted wasn't worth the money and proposed something smaller. That's why we hired them.”

JA
J. Alvarez
Studio City, Kitchen
Houzz
★★★★★

Placeholder copy for this prototype. Replace with verbatim reviews from your live Google, Yelp and Houzz profiles. Never write testimonials on a client's behalf.

Built With Us?

Tell people what actually happened.

Good or bad. A review that names the neighborhood, the scope and one specific thing we did right or wrong is worth more to the next homeowner than ten generic five-star ratings.

Set your review links. Open inc/config.php and paste your Google, Yelp and Houzz review URLs into MAMOS_REVIEW_GOOGLE, MAMOS_REVIEW_YELP and MAMOS_REVIEW_HOUZZ. Until then the buttons stay hidden rather than leading nowhere.

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.

Post a review on this site

Reviews are checked against our project records before they go live, so publication takes a day or two. We do not edit the text.

Where We Build

San Fernando Valley and the Westside.

Each area below gets its own page: local permit jurisdiction, projects we've completed there, and the constraints specific to that neighborhood.

Straight Answers

The questions people ask before they call.

How much does an ADU cost in Los Angeles right now?

Detached ADUs start at $149,000 in the San Fernando Valley, and garage conversions start at $85,000. Where you land above that comes down to four things: how far utilities have to be trenched, whether the site is accessible to equipment, whether a pre-approved standard plan fits your lot, and your finish level. We walk you through all four at the consultation so the number stops being a mystery.

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?

For an ADU using an LADBS pre-approved standard plan, often 6 to 10 weeks. For a custom design, 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.

What deposit will you ask for?

The lesser of $1,000 or 10% of the contract price. That is the legal maximum in California for home improvement work, and we don't exceed it. Everything after that is tied to completed milestones. If any contractor asks for 30% or 50% up front, that alone is a reason to walk. CSLB explains it here.

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.

Project manager reviewing plans on site with clients
Photo: project manager with clients on site, warm daylight

Start Here

Let's find out if this is a fit.

A consultation is a conversation, not a sales call. We'll look at the property, talk honestly about budget, and tell you if we're the wrong firm for the job.

Request a consultation

PDF, JPG, PNG or DWG. Routed to your plans intake address on submit.

Typical reply within one business day. CSLB #1092889. Licensed, bonded and insured.

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