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California / Danville / ADU builders

ADU builders in Danville, California

The short answer

44 licensed contractors building accessory dwelling units in Danville. Every licence below was checked against the California state register. Danville does not publish contractor names on building permits, so this list ranks on licence standing and pre-approved plans.

California Contractors State License Board, checked 2026-08-15
How to read this. Licence details come from the California Contractors State License Board and are dated on each profile. Permit counts reflect only those cities that publish the contractor's name on a building permit, so a builder with none listed may simply have worked where nothing is published. A city that pre-approves a plan has vetted the plan, not the builder, and does not endorse it. ADU Standards takes no payment for placement. Confirm any licence at cslb.ca.gov before you sign.

Ordered by what the records confirm

The list
2

Acton Construction Inc

Nearby permits Licence clear 34 years licensed Workers’ comp on file

CSLB #638333 · CAMPBELL

3

C A Rasmussen Inc

Licensed Licence clear 57 years licensed Workers’ comp on file

CSLB #254681 · VALENCIA

4

Beamans Inc

Licensed Licence clear 49 years licensed Workers’ comp on file

CSLB #333377 · DANVILLE

5

Gayler Design Build Inc

Licensed Licence clear 46 years licensed Workers’ comp on file

CSLB #384275 · DANVILLE

9

Eagle Peak Builders Inc

Licensed Licence clear 35 years licensed Workers’ comp on file

CSLB #615423 · DANVILLE

11

Aspire Builders

Licensed Licence clear 18 years licensed Workers’ comp on file

CSLB #920386 · DANVILLE

12

Us Modular Inc

Licensed Licence clear 16 years licensed Workers’ comp on file

CSLB #943047 · HEMET

13

Quartz Construction

Licensed Licence clear 11 years licensed Workers’ comp on file

CSLB #1003436 · SAN JOSE

15

Michael J Doyle

Licensed Licence clear 60 years licensed No workers’ comp on file

CSLB #240251 · DANVILLE

16

Parshall Construction

Licensed Licence clear 60 years licensed No workers’ comp on file

CSLB #242928 · DANVILLE

21

Michael D Blaha

Licensed Licence clear 45 years licensed No workers’ comp on file

CSLB #409419 · VALENCIA

22

Daniel Sergio Del-do

Licensed Licence clear 44 years licensed No workers’ comp on file

CSLB #412532 · VALENCIA

23

Anco Design Build

Licensed Licence clear 44 years licensed Workers’ comp on file

CSLB #422324 · VALENCIA

25

R E Villalovos Jr

Licensed Licence clear 42 years licensed No workers’ comp on file

CSLB #451875 · VALENCIA

26

Abbes Construction

Licensed Licence clear 31 years licensed Workers’ comp on file

CSLB #702740 · DANVILLE

28

Inspired Builders Inc

Nearby permits Licence clear 4 years licensed Workers’ comp on file

CSLB #1088894 · SUNNYVALE

29

Imkat Construction Corp

Nearby permits Licence clear 4 years licensed Workers’ comp on file

CSLB #1094866 · SACRAMENTO

30

Fusionfit

Licensed Licence clear 9 years licensed Workers’ comp on file

CSLB #1020923 · WALNUT CREEK

31

Promodeling Inc

Licensed Licence clear 8 years licensed Workers’ comp on file

CSLB #1037012 · EL CERRITO

32

Mana Construction Inc

Licensed Licence clear 7 years licensed Workers’ comp on file

CSLB #1043320 · VALLEJO

33

Build 33 Inc.

Licensed Licence clear 7 years licensed Workers’ comp on file

CSLB #1051529 · CUPERTINO

35

Hamilton Exteriors

Licensed Licence clear 5 years licensed Workers’ comp on file

CSLB #1078806 · CASTRO VALLEY

38

Nest Builders

Licensed Licence clear 2 years licensed No workers’ comp on file

CSLB #1117837 · MILL VALLEY

40

ADU Homes Construction

Licensed Licence clear 0 years licensed Workers’ comp on file

CSLB #1151305 · VALENCIA

42

Creative Builders

Licensed Licence clear 45 years licensed No workers’ comp on file

CSLB #392687 · VALENCIA

43

La Ccs

Licensed Licence clear 7 years licensed No workers’ comp on file

CSLB #1047699 · ENCINO

44

Alex R Mathews Inc

Licensed Suspended: no workers’ compensation on file 48 years licensed Workers’ comp on file

CSLB #355393 · DANVILLE

What Danville charges

The city’s published schedule

Danville does not publish a fee schedule specific to accessory dwelling units. What follows is from its general schedule (FY 2026/27), so expect to confirm the figures with the permit counter. These are city fees only. They do not include what a builder charges to design and build the unit.

Plan check
basis percentage of building permit fee
detail Structural and Architectural Plan Review: 65% of building fee. Plumbing Plan Review: 20% of structural and architectural plan review. Electrical Plan Review: 17% of structural and architectural plan review. Mechanical Plan Review: 18% of structural and architectural plan review. Master Plan Verification Review (subdivisions): 75% of structural/architectural plan review. Plan review fees cover one round of plan review (first round comments plus a back check); additional plan review required by changes, additions or revisions is $158 per hour.
other division plan checks Planning Division Plan Check: $75 - $150; over $100,000 valuation, $320. Engineering Division Plan Check: $50 - $100; over $300,000 valuation, $320. Transportation Division Plan Check: $50 - $100; over $300,000 valuation, $320. MWELO Plan Check: $300 performance, $100 prescriptive.
as of 2026-08-03
Building permit
basis valuation-based table, 'As permitted by the California Building Code'
detail $1.00 to $500: $25.08. $501 to $2,000: $25.08 for the first $500 plus $3.26 for each additional $100 or fraction thereof. $2,001 to $25,000: $73.90 for the first $2,000 plus $14.94 for each additional $1,000. $25,001 to $50,000: $417.49 for the first $25,000 plus $10.77 per additional $1,000. $50,001 to $100,000: $668.21 for the first $50,000 plus $7.27 per additional $1,000. $100,001 to $500,000: $1,060.40 for the first $100,000 plus $5.98 per additional $1,000. $500,001 to $1,000,000: $3,451.14 for the first $500,000 plus $5.07 per additional $1,000. $1,000,001 and up: $5,984.90 for the first $1,000,000 plus $3.24 per additional $1,000. Minimum building permit (inspection) fee for any permit: $122.
sub permits Electrical Sub-Permit 20% of building permit fee. Plumbing Sub-Permit 17% of building permit fee. Mechanical Sub-Permit 18% of building permit fee.
valuation table Building Permit Valuation Table, Average Cost per Square Foot by Occupancy & Type. DWELLINGS, Type V Wood Frame: $159.59 per sq ft new, $96.12 remodel. Type V Masonry: $179.50 new, $107.26 remodel. Private Garages, Wood Frame: $141.46 new.
administrative fees Strong Motion Instrumentation Program, residential 0.013% of valuation (minimum $0.50). California Building Standards Fee $1 per $25,000 of total valuation. Comprehensive Planning Fee 0.1% of valuation (maximum $2,000). Documentation Fee $10 plus $1 per page.
as of 2026-08-03
School district fees
rate Not published by the Town. San Ramon Valley Unified School District sets and collects.
Utility connections
water East Bay MUD, not a Town fee.
sewer Central Contra Costa Sanitary District, not a Town fee.
note Danville's Master Fee Schedule Engineering section covers grading, encroachment, drainage and map fees but no water or sewer connection charges, as those are district functions.
Impact fees
note The FY 2026/27 Master Fee Schedule contains no residential development impact fee schedule (no parkland, traffic, or housing impact fee rates). The only development-charge-like item is the Old Town Parking in Lieu Fee ($4,382 per space for retail, $19,093 per space for other uses, per Resolution No. 24-2017, subject to annual CPI adjustment not to exceed 2%). The ADU handout, updated Nov 2025, contains no fee information at all.
town statement on adus Permit fees vary based on application type and will be determined after the application is initially reviewed and collected before permit issuance. For a range of fees based on application type, view the Town's Master Fee Schedule.

Danville’s published schedule does not mention the exemption for ADUs under 750 square feet. California Government Code section 66311.5(c)(1) bars a local agency from imposing impact fees on an accessory dwelling unit of less than 750 square feet. If you are quoted impact fees on a unit that size, ask the city which section authorises them.

Danville fee scheduleFee schedule PDF

Common questions

How is this list ordered?

By what can be confirmed in public records: the number of accessory dwelling unit permits each contractor has on file in Danville, whether Danville has pre-approved their plans, and their licence standing with the California Contractors State License Board. No builder pays for position and none can request removal.

Are these builders licensed?

Every company listed has been matched to an active California contractor licence and its standing is shown on the card. California law requires a contractor to display its licence number in all advertising, and we check the number shown against the state register before publishing anything a company says about itself.

Why do some show no permit history?

Most California cities do not publish the contractor's name on a building permit. Where a city does not publish it, we cannot confirm completed work, so the card says the licence is verified and nothing more. Ask a builder directly for recent addresses and permit numbers you can look up.

What does it mean that Danville pre-approved a builder's plans?

Under Government Code section 65852.27 every California city must accept ADU plans for pre-approval and publish the resulting list. A pre-approved plan has cleared plan check in advance, which shortens permitting. It is an approval of the plan, not an endorsement of the company that drew it.

Companies we looked at and left out

Also considered

These came up when looking for ADU builders in Danville but did not meet the bar for the list above, usually because they do not advertise a California licence number, do not name Danville as an area they serve, or do not present accessory dwelling units as a service they offer. They are shown so the list above can be checked rather than taken on trust.

Four checks worth ten minutes.

Before you sign
  1. Look the licence up yourself at cslb.ca.gov. It takes under a minute and shows the current status, any suspensions, and the bond.
  2. Ask who carries workers’ compensation for the crew and for every subcontractor. A licensee with no employees may lawfully be exempt, but if someone is hurt on your property you can end up treated as the employer.
  3. Ask for two recent permit numbers in any city, then look them up. A builder who has done the work can produce them immediately.
  4. Get the price in writing against a drawing set. A published starting price is for a base model and rarely includes site work, utilities, or Danville fees.