Updated: Mar 27, 2026
Location and Projects
Address
4208 220TH ST SW, Mountlake Terrace, WA, 98043
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Diamond C Construction LLC
Serving the greater Seattle area from its base in Mountlake Terrace, Diamond C Construction LLC specializes in residential construction and remodeling projects. With five years of experience, the company undertakes a range of work, including kitchen and bathroom remodels, additions, and whole-home renovations. Projects often encompass updates to living spaces, flooring installations, tile work, and exterior improvements. Diamond C Construction works with homeowners seeking to update or expand their properties, providing guidance through all phases from planning to project completion. The company emphasizes efficient project management and consistent communication throughout each job. By focusing on residential properties in Seattle and surrounding communities, Diamond C Construction has developed knowledge of regional housing styles and construction requirements relevant to Washington state.
Diamond C Construction LLC Services
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Diamond C Construction LLC Contact Information
Phone Number: (425) 931-2384
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Address: 4208 220TH ST SW, Mountlake Terrace, WA 98043
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Diamond C Construction LLC Mountlake Terrace
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Diamond C Construction LLC has a BuildZoom score of 102, which places them above 89% of 128,670 contractors in Washington.
Activity
|
3 projects
|
2025 |
|
4 projects
|
2024 |
Our building permit records indicate that Diamond C Construction LLC has worked on at least
7.0 projects over the past 2 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.
Pricing
|
1 project
|
$5k-$20k |
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 Diamond C Construction LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Type: mechanical single family class: addition to structure, , moen: (1)dryer exhaust; (1)exhaust fan with duct-laundry; duct work only
Valuation:
N/A
Permit #:
MSF24-06724
Status:
final
Fee:
$217
Permit Type:
N/A
Building Type:
N/A
Type: building single family class: alteration to structure or system, , everts: remodel kitchen modify structural as required for removed interior walls relocate furnace to garage replace water heater relocate appliances in garage
Valuation:
N/A
Permit #:
BSF21-08723
Status:
final
Fee:
$2,971
Permit Type:
N/A
Building Type:
N/A
Type: building single family class: alteration to structure or system, , fields: remodel basement with structural changes install and replacement doors
Valuation:
N/A
Permit #:
BSF23-07644
Status:
final
Fee:
$3,149
Permit Type:
N/A
Building Type:
N/A
Type: building single family class: addition to structure, , fletcher renovation-remodel of kitchen master suite bedrooms and 2nd floor bathroom with dormer addition to second floor
Valuation:
N/A
Permit #:
BSF20-07273
Status:
final
Fee:
$3,481
Permit Type:
N/A
Building Type:
N/A
Remove existing roof down to sheathing and replace. total area of work 2000 sf. 2021 irc
Valuation:
$15,000
Permit #:
BLDG-2024-04151
Status:
final
Fee:
$463
Permit Type:
N/A
Building Type:
N/A
Second story addition
Valuation:
N/A
Permit #:
SFR25-1250
Status:
triage
Fee:
N/A
Permit Type:
Addition and remodel
Building Type:
N/A
E24-59217 mustonen interior remodel interior remodel of kitchen and family/laundry room
Valuation:
N/A
Permit #:
BSF2024-38893
Status:
final
Fee:
$1,746
Permit Type:
N/A
Building Type:
N/A
Cap existing downdraft venting. new cooktop hood vent
Valuation:
N/A
Permit #:
M2311-107
Status:
final
Fee:
$41
Permit Type:
Residential mecha...
Building Type:
N/A
Remove kitchen wall to dining room for kitchen remodel
Valuation:
N/A
Permit #:
B2310-058
Status:
final
Fee:
$2,651
Permit Type:
Residential alter...
Building Type:
N/A
Replace or alter existing asphalt shingle
Valuation:
N/A
Permit #:
2510-263
Status:
issued
Fee:
$209
Permit Type:
N/A
Building Type:
N/A
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Diamond C Construction LLC Reviews
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Verified License
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Diamond C Construction LLC License info
Verified License
| License # | DIAMOCC814BP |
| Status | Active |
| City | Tukwila |
| Type | Construction Contractor, General |
| Class | Limited Liability Company |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Diamond C Construction LLC at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | DIAMOCC814BP |
| Status | Active |
| State | Washington |
| Type | Construction Contractor, Construction Contractor |
| Business Type | Limited Liability Company |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Diamond C Construction LLC at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
102
BuildZoom Score
Insured
| Insurer | Developers Surety & Indem Co |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Western Surety Co |
| Bond Value | $12,000 |
9
Permits
- Building permit records show that Diamond C Construction LLC has worked on 9 permitted projects.
Diamond C Construction LLC Employees
CC
Coster, Steven Charles
Owner
SC
Steven Coster
Partner/Member