Updated: Mar 25, 2026
Location and Projects
Address
3810 SOMERSET AVE, Castro Valley, CA, 94546
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H 3 D HOME CONSTRUCTION
H 3 D HOME CONSTRUCTION, 3810 Somerset Ave, Castro Valley, CA (Owned by: Hanli Du) holds a General Building license according to the California license board.
Their BuildZoom score of 105 ranks in the top 8% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring H 3 D HOME CONSTRUCTION, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
H 3 D HOME CONSTRUCTION Services
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H 3 D HOME CONSTRUCTION Contact Information
Phone Number: (510) 996-2832
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Address: 3810 SOMERSET AVE, Castro Valley, CA 94546
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H 3 D HOME CONSTRUCTION Castro Valley
Quality
105
92nd percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
H 3 D HOME CONSTRUCTION has a BuildZoom score of 105, which places them above 92% of 336,931 contractors in California.
Activity
|
6 projects
|
2025 |
|
4 projects
|
2024 |
|
3 projects
|
2023 |
Our building permit records indicate that H 3 D HOME CONSTRUCTION has worked on at least
13.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
7 projects
|
Home Additions |
Analyzing permits over the last 4 years shows that H 3 D HOME CONSTRUCTION mostly works on
home addition
projects.
Pricing
|
1 project
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
5 projects
|
$50k-$100k |
|
3 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $95,000. This graph shows the distribution of these job values.
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
Building Permits by H 3 D HOME CONSTRUCTION
This is a sample of this contractor's permits. Click here to access their complete permit history.
Existing dwelling raise existing dwelling (unit 1) 1'-8 and convert basement level to living area 881 sq.ft upper floor area 831 sq.ft. addition. total habitable area 1 712 sq.ft front unit proposed with sb-9 per separate permit
Valuation:
$250,000
Permit #:
PREBLD25-0232
Status:
approved
Fee:
$94
Permit Type:
N/A
Building Type:
N/A
Addition of 325 s.f. to rear of residence to construct (n) living room & kitchen. reconfiguring house layout. panel upgrade to 200 amps. creating 4bed/3bath residence
Valuation:
$289,500
Permit #:
BLD2025-07251
Status:
issued
Fee:
$9,409
Permit Type:
Addition
Building Type:
N/A
Addition of 608 sf for (3) bedrooms and new entry; remodel existing space for new family room (1) bathroom and walk-in closet; creating 4bed/3bath residence. install skylights. relocate and upgrade panel to 200amp. reduce existing shed to 120 sf
Valuation:
$95,000
Permit #:
BLD2024-06308
Status:
issued
Fee:
$6,621
Permit Type:
Addition
Building Type:
N/A
Remodel bathroom convert closet and portion of living area to powder room relocate and remodel kitchen change the staircase direction block (e) window and door open a 3'x3 window of the kitchen
Valuation:
$75,000
Permit #:
BLD2024-05416
Status:
complete
Fee:
$4,754
Permit Type:
Addition
Building Type:
N/A
Enf-2025-00079 - legalize unpermitted 3-compartment wet bar sink 13'-5 long countertop with (4) new outlets for small appliances on a dedicated circuit and (1) outlet for a garbage disposal. legalize unpermitted partition wall in family room. ** family room bathroom #2 and bedroom #4 & #5 not to be used as a separate dwelling unit. **
Valuation:
$15,000
Permit #:
BRALT-25-0222
Status:
filed
Fee:
$631
Permit Type:
Interior remodel
Building Type:
N/A
Scope of work: 1. addition detached 2 beds 1 bathroom accessory dwelling unit area = 680 sq.ft. 2. addition new electric panel 200 amp for adu 3. new water meter 3/4 for adu
Valuation:
$110,000
Permit #:
BCCELL-23-0007
Status:
complete
Fee:
$139
Permit Type:
New
Building Type:
N/A
Addition 749 sq.ft. detached adu in backyard with 2 bedrooms 2 bathroom 1 kitchen new 200 amp electrical panel for adu rev 1 delta 1 (bralt-25-0016): connect adu to (e) water meter no longer intalling dedicated water meter 200 amp electrical meter for adu instead of 100 amp -- updated t24
Valuation:
$149,800
Permit #:
BRADU-23-0004
Status:
complete
Fee:
$13,606
Permit Type:
N/A
Building Type:
N/A
1) repair fire damaged residence 2) convert laundry into bedroom 3) interior alteration to kitchen 4) install new insulation r-15 wall r-30 attic 5) replace existing furnace to mini-split
Valuation:
$50,000
Permit #:
BLD2023-03475
Status:
triage
Fee:
$714
Permit Type:
Alteration
Building Type:
N/A
Relocate and remodel kitchen. new closet and beam in entryway. convert existing bedroom and bathroom into a master bathroom and walk-in closet. addition new bathroom. for jadu see bld2022-01783. (concurrent review: pln2022-00166)
Valuation:
$50,000
Permit #:
BLD2021-06849
Status:
complete
Fee:
$3,333
Permit Type:
Alteration reside...
Building Type:
N/A
746 sf detached adu - 2 bed 2 bathroom kitchen living room laundry furnace in attic tankless water heater
Valuation:
$140,000
Permit #:
B20-1196
Status:
final
Fee:
$7,542
Permit Type:
N/A
Building Type:
N/A
Convert existing 224sqft living space into a studio jadu. install new 100amp panel for jadu. for primary house remodel see bld2021-06849. (concurrent review: pln2022-00166)
Valuation:
$20,000
Permit #:
BLD2022-01783
Status:
complete
Fee:
$1,729
Permit Type:
N/A
Building Type:
N/A
645sqft detached adu creating 1bed/1bath unit;
Valuation:
$95,000
Permit #:
BLD2024-06279
Status:
triage
Fee:
$4,367
Permit Type:
New accessory dwe...
Building Type:
N/A
746 sf detached adu 2 bed 1.5 bathroom tankless water heater furnace in attic rev - delta 3 (b21-2528) - remove 1 window from prev. approved plans - relocate (e) electrical. meter & proposed electrical. meter for adu
Valuation:
$135,000
Permit #:
B20-0943
Status:
issued
Fee:
$11,030
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$75,000
Permit #:
BLD2024-0510
Status:
issued
Fee:
$1,881
Permit Type:
Alteration
Building Type:
N/A
Revise structural plan to show existing ridge beam
Valuation:
N/A
Permit #:
BLD2021-06849-001
Status:
triage
Fee:
$206
Permit Type:
N/A
Building Type:
N/A
Addition of 95sf for new entry. new 37sf front porch. convert existing carport into new 367sf attached garage
Valuation:
$35,000
Permit #:
BLD2023-07483
Status:
expired
Fee:
$1,268
Permit Type:
Alteration
Building Type:
N/A
(n) detached 762 sf structure – 690 sf 2-bedroom adu with 72 sf covered porch; (n) 200a subpanel at main house and (n) 125a subpanel at adu; 40 gallon heat pump water heater in 13 sf exterior utility closet 18-seer/9.5 hspf hvac and (n) dedicated water 3/4 water line with (n) water service meter
Valuation:
$143,350
Permit #:
BRADU-23-0050
Status:
triage
Fee:
$2,205
Permit Type:
N/A
Building Type:
N/A
Drl: proposed adu 995 sq ft with 2 bedrooms 2 baths kitchen. rev1: upgrade existing water meter to 3/4 rather than propose new water meter. 200 amp panel for adu. (aand 5/17/23). note: any work done to the primary dwelling including but not limited to panel upgrade/relocation will require a separate permit. concurrent review pln2022-00247
Valuation:
$230,000
Permit #:
BLD2022-05688
Status:
complete
Fee:
$7,608
Permit Type:
New accessory dwe...
Building Type:
N/A
New construction: detached three-story five-unit residential building at the rear of a parcel containing an existing four-unit residential building
Valuation:
$338,160
Permit #:
B1702873
Status:
final
Fee:
$53,143
Permit Type:
N/A
Building Type:
N/A
Convert existing detached garage into 774sf (2bed/2bath) adu. new 100amp panel and water meter
Valuation:
$70,000
Permit #:
BLD2023-00876
Status:
complete
Fee:
$5,619
Permit Type:
N/A
Building Type:
N/A
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H 3 D HOME CONSTRUCTION License info
Verified License
| License # | 977770 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for H 3 D HOME CONSTRUCTION at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
105
BuildZoom Score
Bonded
| Bonded Agent | Western Surety Company |
| Bond Value | $15,000 |
22
Permits
- Building permit records show that H 3 D HOME CONSTRUCTION has worked on 22 permitted projects.
H 3 D HOME CONSTRUCTION Employees
HD
Hanli Du
Sole Owner
HD
Hanli Du
Owner