Polymath Development Group Inc
Home addition contractor based in Los Angeles.
- License 1069728 was not in the state's records on Sep 23, 2026
6 jobs on Los Angeles permits, 2024 to 2025: 3 home additions, 3 ADUs.
We could not find an active or renewable license for this business in the state's records on Sep 23, 2026. Check the license with the state before you hire.
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 1069728 was not in the state's records on Sep 23, 2026 | Problem |
| Jobs on record | 6 jobs on Los Angeles permits, 2024 to 2025: 3 home additions, 3 ADUsTheir permits mention 1 garage.Our Los Angeles permit records cover September 2023 to September 2026. |
Records: the state license board and City of Los Angeles permits.
Cost and timing
All addition jobs in Los Angeles: $38,000 to $120,000
Half of 10,836 city permits list an amount in this range. Permit amounts are often lower than what you pay.
- Second-story additions in Los Angeles: $75,000 to $200,000 (858 permits)
- Garage additions in Los Angeles: $48,000 to $110,000 (3,411 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 $95,000 (half list more, half less)
That is the figure written on the permit form, which can be far from what you pay. What addition jobs cost in Los Angeles.
Get 2 or 3 written quotes.
Permit timeline
Across Los Angeles, a addition permit stays open about about 13 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 addition jobs take.
Track record
Jobs per quarter
Where they work most
- 916052 jobs
- 900592 jobs
- 900631 job
- 900641 job
Jobs by kind of work
Latest jobs
Permit values are what the contractor wrote on the permit form, not what the owner paid.
| Date | Work | ZIP | On the permit form |
|---|---|---|---|
| Oct 8, 2025 | AdditionNew 36'6" x 26'9" two story accessory dwelling unit per lamc 12.22.a.3 | 91605 | $121,000 |
| Oct 8, 2025 | ADUNew 36'6" x 26'9" two story accessory dwelling unit per lamc 12.22.a.3 | 91605 | $121,000 |
| Nov 30, 2024 | ADUPROPOSED 30'x30' ONE STORY ACCESSORY DWELLING UNIT(1,200 SF max per Or | 90063 | $94,500 |
| Nov 19, 2024 | Addition(n) ground floor addition to (e) 2-story single family dwelling | 90064 | $70,000 |
| Feb 13, 2024 | Addition(e) garage with an addition to be converted to a detached adu per ordi | 90059 | $95,000 |
| Feb 13, 2024 | ADU(e) garage with an addition to be converted to a detached adu per ordi | 90059 | $95,000 |
What to ask before you hire
About Polymath Development Group Inc
- Do not hire until the contractor shows you an active license.
- Ask what the warranty covers and for how long, in writing.
Worth asking any home addition contractor
- Can you show me proof of liability insurance and your bond?
- Do you handle the plans and engineering, or do I hire them?
- Who will run the job day to day, and who are the subcontractors?
- Who pulls the permits, and what is the payment schedule?
Get a quote from Polymath Development Group Inc
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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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