Ace Drilling & Excavation
ADU builder based in San Francisco. Licensed since 2007.
- License active
- Workers' comp on file
4 jobs on San Francisco permits, 2022 to 2025: 3 ADUs, 1 home addition. 14th most ADU permits of 35 contractors in San Francisco.
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 889820, active in the state's records on Sep 23, 2026General engineering, general 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 2007 | |
| Jobs on record | 4 jobs on San Francisco permits, 2022 to 2025: 3 ADUs, 1 home addition14th most ADU permits of 35 licensed contractors in San Francisco. That counts jobs, not quality.Our San Francisco permit records cover September 2021 to September 2026. |
Records: the state license board and City of San Francisco 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 889820 on CSLB
Cost and timing
All ADU jobs in San Francisco: $40,000 to $180,000
Half of 869 city permits list an amount in this range. Permit amounts are often lower than what you pay.
- Detached ADUs in San Francisco: $40,000 to $190,000 (33 permits)
- Garage conversions in San Francisco: $30,000 to $153,000 (28 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 $10,000 (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 San Francisco.
Get 2 or 3 written quotes.
Permit timeline
Across San Francisco, a ADU permit stays open about about 15 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 7 months. How long ADU jobs take.
Track record
Where they work most
- 941104 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 |
|---|---|---|---|
| Nov 7, 2025 | AdditionScope of work includes expanding unit 452 from 2nd fl to the 1st floor & reconfiguring it with 2… | 94110 | $300,000 |
| Apr 12, 2022 | ADU (×3, same day) | 94110 | $10,000 each |
What to ask before you hire
About Ace Drilling & Excavation
- 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 Ace Drilling & Excavation
Five quick questions. We pass your request to Ace Drilling & Excavation.
Request for Ace Drilling & Excavation
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Sent. We have your request.
We pass it to Ace Drilling & Excavation. Replies usually come within a few days.
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.
Open your job roomMore ADU builders near 94110
- Doherty Restoration, Inc.
- Maxg Construction Inc (maxwell M Ghobadi
- R Group, Inc
- Peter Harris Construction Inc
- Wickman Development and Construction
- Area Development Inc.
See all 35 ADU builders in San Francisco, ranked by jobs
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