Mamos Construction & Design
ADU builder based in Woodland Hills. Licensed since 2022.
- License active
- Workers' comp on file
17 jobs on Los Angeles permits, 2023 to 2026: 7 ADUs, 4 home additions, 3 roofing jobs, 3 remodels. 53rd most ADU permits of 271 contractors in Los Angeles.
What the public records show
From the state's license records and the city's permits, one question at a time.
| Question | Records show | Mark |
|---|---|---|
| Licensed? | License 1092889, active in the state's records on Sep 23, 2026General buildingNo complaints or citations on the board's public record. | Checks out |
| Workers' comp? | Workers' comp policy on file with the stateThis covers their crew if someone is hurt. It is not insurance for your home. | On file |
| In business? | Licensed since 2022 | |
| Jobs on record | 17 jobs on Los Angeles permits, 2023 to 2026: 7 ADUs, 4 home additions, 3 roofing jobs, 3 remodelsThey are based in Woodland Hills. Work outside Los Angeles is not in these records.53rd most ADU permits of 271 licensed contractors in Los Angeles. That counts jobs, not quality.Our Los Angeles permit records cover September 2023 to September 2026. |
Records: the state license board and City of Los Angeles permits.
State license board record
Last checked Oct 4, 2026. This may have changed. Check it on CSLB.
No complaints or citations on the board's public record.
Source: California Contractors State License Board, checked Oct 4, 2026. Look up license 1092889 on CSLB
Cost and timing
All ADU jobs in Los Angeles: $35,000 to $120,000
Half of 9,338 city permits list an amount in this range. Permit amounts are often lower than what you pay.
- Detached ADUs in Los Angeles: $46,000 to $121,000 (3,485 permits)
- Garage conversions in Los Angeles: $30,000 to $65,000 (3,524 permits)
- Junior ADUs in Los Angeles: $20,000 to $50,000 (768 permits)
How to read this range
Contractors write a job value on the permit form, and the city uses it to set the permit fee. It is not the contract price, and it is often lower than what you pay. A quarter of the permits list less than this range, and a quarter list more. Use it to see if a quote is in the normal range.
Permit value (not a price)
Their typical permit lists $60,000 (half list more, half less)
That is the figure written on the permit form, which can be far from what you pay. What ADU jobs cost in Los Angeles.
Get 2 or 3 written quotes.
Permit timeline
Across Los Angeles, a ADU permit stays open about about 12 months, from permit to final inspection
This is not how long the crew works at your home: most of it is waiting for the inspection. Ask them how many days the work takes. Waiting for the permit adds about about 4 months. How long ADU jobs take.
Track record
10 jobs in the last 12 months, up from 5 the year before
Where they work most
- 900353 jobs
- 900643 jobs
- 913162 jobs
- 916052 jobs
- 900192 jobs
Jobs by kind of work
Latest jobs
Permit values are what the contractor wrote on the permit form, not what the owner paid.
A row marked ×2 or more stands for that many similar jobs on one day in one ZIP code.
| Date | Work | ZIP | On the permit form |
|---|---|---|---|
| Aug 27, 2026 | AdditionProposed two story addition to (e) 1 story single famiyl dwelling | 91316 | $165,000 |
| May 19, 2026 | Reroof, 24 squares (2,400 sq ft)Re-roof with Class A or B roof covering material weighing less than 6 pounds per sq | 91316 | $9,000 |
| May 11, 2026 | RemodelRemodel to convert the (e) breakfast room to a (n) bedroom | 90035 | $45,000 |
| Apr 28, 2026 | AdditionTwo story ADU addition to the existing detached garage per LAMC 12.22A | 90064 | $70,000 |
| Apr 28, 2026 | ADUTwo story ADU addition to the existing detached garage per LAMC 12.22A | 90064 | $70,000 |
| Apr 27, 2026 | AdditionTwo story addition and new 2nd floor to (e) 1 story SFD. 1 of 2 | 90064 | $180,000 |
| Feb 23, 2026 | Addition**proposed conversion of garage to two accessory dwelling units | 90035 | $175,000 |
| Feb 23, 2026 | ADU**proposed conversion of garage to two accessory dwelling units | 90035 | $175,000 |
| Nov 14, 2025 | ADU (×2, same day)Convert existing attached garage to new accessory dwelling uni | 91605 | $60,000 each |
| Aug 14, 2025 | ADUConvert (e) detached carport into 2 accessory dwelling units pe | 90044 | $90,000 |
| Mar 28, 2025 | ADUConvert (e) attached garage to second (n) accessory dwelling unit per | 90019 | $30,000 |
| Mar 14, 2025 | ADUConvert the existing attached 4 car garage into an ADU | 90019 | $30,000 |
| Feb 24, 2025 | RemodelRemodel unit 1F on first floor of an (E) non-sprinklered two-story duplex and convert 525 sf… | 90037 | $30,000 |
| Nov 21, 2024 | Reroof, 3900 squares (390,000 sq ft)Re-roof with Class A or B material weighing less than 6 pounds per sq | 90011 | $12,000 |
| Dec 19, 2023 | Reroof"COMPLY WITH DEPARTMENT ORDER effective date10/23/2023. PERMIT WILL EXPIRE 30 DAYS FROM ISSUANCE… | 91356 | $9,500 |
| Jul 19, 2023 | Remodel2 kitchen / 1 bathroom remodels | 90018 | not stated |
What to ask before you hire
About Mamos Construction & Design
- Ask what the warranty covers and for how long, in writing.
Worth asking any ADU builder
- Can you show me proof of liability insurance and your bond?
- Do you handle the plans, engineering and utility hookups, or do I?
- How long from permit to the final inspection on your last three ADUs?
- What is the payment schedule, and what is extra?
Get a quote from Mamos Construction & Design
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Your job room keeps the request, your photos and every reply in one place, with an assistant that checks prices against city permits. Keep its link: it is the key to your job.
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