United States › California › Contra Costa County

Contra Costa County, CA solar installation & market data

Updated May 11, 2026 By The SolarDNA Data Team

Contra Costa County has 101,002 solar installations across 47 zip codes at a median installed cost of $4.40/W, installations up 6.6% over the trailing twelve months, and an installs-weighted Market Score of 49.

See Contra Costa County on the map California market

Active installations

101,002

Zip markets

Median cost

$4.40/W

12-mo growth

▲ 6.6%

Installers active

1,489

County Market Score

Great · installs-weighted across 47 zips

Best zip in Contra Costa County scores higher than 99% of U.S. zip markets.

Versus California

How Contra Costa County compares with the state

Installed cost

$0.13/W above

state median $4.26/W

Market score

49 vs 53

California scores 53

Share of state installs

4.47%

of 2.3M tracked statewide

Battery attach

10.8%

state 12.7%

Statewide momentum

▲ 1.1%

residential solar added in California, 12 months through Jul 2026

Statewide market

2.3M systems

30.9% of homes · utility-reported through Jul 2026

Next-12-month outlook: 6,097–7,451 installs (midpoint 6,774)

Trailing-12-month installs carried forward at half the observed growth rate (capped at ±30%), with a ±10% band. Not a forecast of permits or policy.

Growth & pricing

Contra Costa County by year

6,558 installs in the trailing twelve months vs 6,154 before

Installations by year

Median installed cost, $/W DC by year

Installer comp set

Who installs in Contra Costa County

Summed across every zip in the county

Export CSV

#	Installer	Installs	12-mo	Zips	$/W
1	TESLA	16,208	550	41	$5.01
2	SUNRUN	15,817	1,324	40	$4.39
3	SUNPOWER	6,567	25	38	$4.49
4	WEST COAST SOLAR	2,773	63	40	$3.75
5	BRIGHT OPS	2,728	606	37	$4.96
6	CITADEL ROOFING AND SOLAR	2,665	535	38	$2.91
7	PETERSENDEAN	2,114	0	39	$3.82
8	FREEDOM FOREVER	1,983	252	39	$5.04
9	SEMPER SOLARIS	1,594	96	39	$4.45
10	DIABLO SOLAR SERVICES	1,477	42	39	$4.34
11	YOUR ENERGY SOLUTIONS	1,396	100	36	$3.70
12	SUNGEVITY	1,331	0	38	$3.87
13	KOTA CONSTRUCTION	1,243	3	37	$4.88
14	SOLAR TECHNOLOGIES	1,012	72	35	$4.59
15	SKY POWER SOLAR	973	0	34	$4.08
16	QUICK SYSTEMS	915	0	30	$3.76
17	BETTER EARTH	881	0	36	$4.79
18	V3 ELECTRIC	854	93	37	$4.49
19	DEL SOL ENERGY	852	0	34	$3.56
20	INFINITY ENERGY	843	3	34	$4.21
21	HOOKED ON SOLAR	831	35	38	$4.38
22	AMBROSE SOLAR	692	83	37	$4.95
23	AMERICAN ARRAY SOLAR	681	0	37	$4.38
24	SOL R US ELECTRIC ENGINEERING	676	0	36	$3.30
25	GOT WATTS ELECTRIC	670	1	35	$3.85

Zip markets

Zips in Contra Costa County

Ranked by installations · click for the zip market

Zip	Installs	$/W	Score
94513	11,478	$4.25	48 B
94531	7,002	$4.25	44 C
94565	6,737	$4.56	47 B
94561	6,572	$4.25	51 A
94509	5,579	$4.56	43 C
94583	4,547	$4.15	50 B
94582	4,179	$4.08	53 A
94553	4,018	$4.48	56 A
94526	3,531	$4.16	58 A
94521	3,446	$4.45	54 A
94549	3,232	$4.31	51 A
94506	2,920	$4.16	53 A
94523	2,904	$4.33	54 A
94598	2,819	$4.29	50 B
94505	2,632	$4.20	50 B
94563	2,512	$4.53	55 A
94507	2,117	$4.22	57 A
94518	1,953	$4.35	55 A
94806	1,783	$4.95	44 C
94803	1,777	$4.95	48 B
94530	1,759	$4.84	45 C
94547	1,731	$4.57	56 A
94804	1,635	$5.12	55 A
94519	1,569	$4.67	46 B
94556	1,469	$4.48	50 B
94517	1,440	$4.37	43 C
94596	1,320	$4.23	47 B
94801	1,248	$5.13	41 C
94597	1,222	$4.10	46 B
94520	1,184	$4.67	39 D
94595	1,125	$4.27	47 B
94564	1,123	$4.97	46 B
94805	756	$5.12	43 C
94572	474	$5.04	37 D
94511	450	$3.52	35 D
94514	285	$4.40	39 C
94525	205	$5.12	35 D
94528	125	$4.57	38 D
94548	80	$3.81	41 C
94527	34	$8.46	29 F
94569	18	$5.12	34 D
94516	6	$1.01	48 B
94807	2	$8.20	28 F
94808	1	$7.04	28 F
94802	1	$7.52	28 F
94570	1	$8.75	28 F
94522	1	$14.88	28 F