California · Gunite & Concrete Pool Builders · Updated 2026
19 gunite pool builders serving Union City — custom concrete, shotcrete and gunite construction — ordered by customer rating and review count, with 2026 prices for a standard pool, a spa and the finish upgrades.
Ordered by customer rating and review count across the Union City area. Listings include the available rating, contact details and location; confirm current credentials and scope directly.
Planning a new pool as well? The Union City pool builders directory ranks all 148 builders in the area.
A mid-size gunite pool (about 16×32) with a standard plaster finish in Union City typically runs $97,500–$156,000. Spas, premium finishes, features and decking are where custom pools climb from there:
| Job | Typical Union City price |
|---|---|
| Small gunite pool (about 12×24), plaster finish | $71,500–$104,000 |
| Mid-size gunite pool (about 16×32) | $97,500–$156,000 |
| Large or elaborate custom pool | $156,000–$325,000+ |
| Attached gunite spa with spillover | $19,500–$45,500 |
| Pebble or quartz finish upgrade | $6,500–$15,500 |
| Tanning ledge or beach entry | $4,000–$10,500 |
| Water features, lighting, fire bowls | $2,500–$19,500 |
| Decking and coping | $10,500–$32,500 |
| Rock or hard-dig excavation allowance | $4,000–$19,500 |
| Permits, engineering, soils report | $1,000–$5,200 |
California pricing is above the national baseline used for these estimates, mainly on labor and permitting. Gunite bids vary more than any other pool type because every element is custom — compare the shell thickness, steel schedule, finish, feature and equipment lines, not just the bottom number.
Spas, ledges, benches, lighting niches and water features are cheapest when they are shot into the shell — adding them later means cutting concrete.
Union City market
3.9 average customer rating · 319 reviews · 19 companies
See All on the Map →19 gunite pool builders serving Union City. The ranked companies average 3.9 stars across 319 customer reviews. PoolPad orders the list with a weighted score that combines customer rating and review count, so a long track record counts for more than a handful of scores.
Terrain drives engineering: hillside lots need soils reports, caissons, or retaining structures, and every shell is built to seismic-conscious standards. Expansive soils show up across the state, so structural engineering isn't the place to save money. Title 24 energy rules mean variable-speed pumps are the standard spec, not an upgrade. Infinity edges on view lots, pebble interiors, baja shelves, and increasingly small, deliberate pools — plunge pools, cocktail pools, and spools that fit tight lots and tighter water budgets. Automation and solar heating adoption lead the nation.
For statewide rankings, city counts and California prices, see the California gunite pool builders directory, or check the nearby cities below.
Ask for the shell engineering and the gunite crew's track record, read the structural, finish and equipment warranties separately, and compare at least three itemized bids for the same design. Pool builders need a CSLB C-53 swimming pool contractor license — verify it (and the bond) on the state's site in about a minute. California also requires new and remodeled pools to include two of seven approved drowning-prevention safety features, and many water districts add rules on filling and draining during drought years.
A mid-size gunite pool with a plaster finish in Union City, CA typically runs $97,500–$156,000; small pools run $71,500–$104,000 and large custom designs $156,000–$325,000+. An attached spa adds $19,500–$45,500, a pebble or quartz finish $6,500–$15,500, and decking $10,500–$32,500. California pricing is above the national baseline used for these estimates, mainly on labor and permitting.
Both are concrete sprayed over a steel cage. Gunite is a dry mix with water added at the nozzle; shotcrete is wet-mixed concrete pumped through the hose. Each produces a strong shell when applied by a good crew — the nozzleman's skill, the mix design and proper curing matter more than which method is used. Ask which your builder uses and what thickness is specified.
Plan on eight to sixteen weeks from excavation to swimming: dig and steel in the first week or two, the shell shot and cured for about four weeks, then tile, coping, plumbing, equipment, decking and finally the plaster and fill. Permits add two to eight weeks before the dig. Builders here work year-round; weather delays are mostly rain.
The concrete shell can last 50 years or more. The plaster finish lasts about 10 to 15 years (quartz and pebble 15 to 20 or more), waterline tile and coping 15 to 25 years, and equipment 8 to 15 years. Balanced water, especially calcium hardness and pH, is what protects the finish.
The prime outdoor season in Union City runs May through October along the coast, longer inland — roughly 6 months of comfortable unheated swimming — and pools stay open and running year-round rather than being winterized. The coast swims May through October (heaters stretch it), while the Central Valley and desert run hot enough for six-plus unassisted months. Pools stay open all year, winter is mild, and evaporation — not freeze — is the seasonal enemy, especially inland.
R&R Backyard Remodeling has the highest customer rating on this Union City list at 5 stars across 36 reviews. Adams Pool Solutions has the largest review count (134 reviews at 4.4 stars). PoolPad orders the list with a weighted score that combines customer rating and review count, so a long track record counts for more than a handful of scores.
Usually, for the same size: the shell is built on site, the finish is a separate trade, and custom features add up. The gap narrows for large pools and designs with spas and ledges, where fiberglass models are limited. Over 20 years a gunite pool also needs at least one resurfacing, which is part of its true cost.
Pool builders need a CSLB C-53 swimming pool contractor license — verify it (and the bond) on the state's site in about a minute. California also requires new and remodeled pools to include two of seven approved drowning-prevention safety features, and many water districts add rules on filling and draining during drought years.
Check gunite pool builders in cities near Union City, or open the California directory for every listed market in the state.
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