Imagine your backyard on a July evening. The kids are jumping off the steps, and nobody is staring at a screen. You are sitting on a rock ledge with your feet in the water.
Many Tulsa families think that scene needs a big, flat yard and a six-figure budget. A semi-inground pool often proves them wrong. As a semi-inground builder across the Tulsa metro, we answer questions about this pool type every week.
This post covers how semi-inground pools are built, how deep they go, what they cost, and who they fit.
What Is a Semi-Inground Pool?
A semi-inground pool is partly buried and partly raised. The bottom section sits below ground, while the top wall stands above it like a short garden wall around the water.
On a sloped yard, the design goes one step further. One side of a semi-inground pool can sit fully above ground, letting the pool settle into a hillside instead of fighting it.
The raised wall is the signature feature. Builders face it with natural rock, decorative brick, pavers, wood, or composite decking. Done well, the wall looks planned and becomes a ledge to sit on, a base for a waterfall, or the front of a poolside bar.
We build with Hydra's Samson 52-inch steel wall. Most pool walls stop at 42 inches. The Samson adds a full foot of structural wall, allowing deeper water and greater resistance to soil pressure. Its American-made panels carry a G-235 galvanized coating, a heavy zinc layer that protects the steel from rust. A vinyl liner covers the inside and holds the water.
Our semi-inground pools use a vinyl liner, though you can also set a fiberglass pool semi-inground at a higher cost. Unless your yard slopes, we recommend setting a fiberglass pool fully in the ground.
Two Different Products Share One Name
Two very different products are both sold under the name semi-inground pool.
The first is a sunken above-ground pool. You buy a round or oval kit, dig a shallow hole, and set the pool partway into it. Its walls are light steel, resin, or aluminum, designed for above-ground use, and many kits ship straight to your door.
The second is an inground-grade pool set partly above grade. It uses heavier wall panels, a real excavation, buried plumbing, and stone backfill that supports the walls. The raised wall then gets a finish, so it looks like part of the landscape.
| Feature | Sunken Above-Ground Kit | Inground-Grade Semi-Inground Pool |
|---|---|---|
| Walls | Light steel, resin, or aluminum | Galvanized steel panels made for partial burial |
| Common shapes | Often round or oval | Rectangle, Grecian, lagoon, oval, and round |
| Who installs it | Homeowner or a hired crew | A pool builder |
| Floor under the liner | Can be sand | Vermiculite on our builds |
| Backfill behind the walls | Can be the native soil | 3/8 chip stone on our builds |
| Raised wall finish | Can be left bare | Rock, brick, or decking |
When you compare prices online, ask which of these two products you are looking at. That one question explains most of the price gap. Our kits vs custom guide walks through that gap line by line.
How a Semi-Inground Pool Is Built
A semi-inground pool is a permanent structure, not an above-ground pool with dirt piled around it. Here is how we build one, step by step.
1. Site visit and design. We walk your yard, measure the slope, check access, and look at your electrical panel. The visit is free and takes about an hour. Afterward, we create a 3D design, so you can see the pool on your property before anyone digs.
2. Permits and utility marks. Hydra notes that semi-inground pools are usually permitted much like traditional inground pools. Every city in the Tulsa metro runs its own permit process, and approval takes about one to four weeks. Our pool permits guide covers the local rules city by city. Before any digging starts, someone must call OKIE811. The free service has utility companies mark buried gas, power, and cable lines.
3. Excavation. We dig every semi-inground pool at least 18 inches deep, our firm minimum. On a sloped lot, we set the pool deeper on the uphill side.
4. Walls and floor. We pour concrete under the wall line, so every panel rests on a solid base instead of loose soil. The Samson steel wall panels then go up and get braced. The floor gets a firm layer of vermiculite instead of loose sand, which can shift and leave soft spots under your feet.
5. Plumbing and equipment. We run the plumbing and set a variable-speed pump and filter on a level equipment pad. A standard installation includes one skimmer and one return.
6. Backfill. We fill behind the walls with 3/8 chip stone instead of the clay that came out of the hole. Tulsa clay holds water, and clean stone gives that water a path to drain. Any pool type can go into Tulsa clay soil, because the construction method decides how well it holds up.
7. Liner and water. We install a custom-fit 28 mil liner, then fill the pool with water. Then we start the equipment and teach your family how to care for the pool.
8. Finish the raised wall. We finish the exposed wall with natural rock or decorative brick, and pour the concrete deck around the pool.
Manufacturers often say semi-inground walls go up in days, and the walls do. The finished pool, with liner, rock wall, and deck, takes about 26 working days from the first day of excavation. Rain and permit delays can add time, but they never add dollars to your contract.
Semi-Inground Pool Shapes and Sizes
Our published packages start with two shapes. The OK Plunge is a 10x20 pool, and our Rectangle and Freeform packages are 14x28. We also build the other shapes in the Hydra semi-inground line.
| Shape | Sizes in the Hydra Line |
|---|---|
| Rectangle | A wide range of sizes |
| Grecian | 10'7" x 20'7", 12x24, 14x28, 16x32 |
| Lagoon | 12x23, 14x28, 16x34 |
| Oval | 10x20, 12x24, 15x30, 18x33 |
| Round | 12, 15, 18, 24, and 30 feet across |
We price every shape and size except our two packages after we see your yard.
Steps and Entry Options
Steps and ledges do more than get you into the water. They decide where the kids play and where the adults sit. We add whatever steps and entries you want, and the Hydra line offers three main styles.
- Drop-in steps. Molded steps set into one end or corner. They are durable and quick to install.
- Vinyl-covered steps. Steps wrapped in the same liner as the pool, so they blend into the water.
- Sun ledges and benches. A shallow lounging shelf gives small kids a place to splash and adults a place to sit in the water. Built-in benches add seating along the wall.
We price entries based on your design, once we know how your family plans to use the pool.
How Deep Is a Semi-Inground Pool?
Our semi-inground pools are 4 to 6 feet deep. That depth works for kids learning to swim, and it lets adults stand, float, and cool off on a hot July afternoon. These pools are not built for diving, so set a no-diving rule from day one.
Depth varies more across the country, and Angi lists most semi-inground pools as 3 to 8 feet deep. The final depth depends on the wall system and how much digging the builder plans.
How Much of a Semi-Inground Pool Sits Above Ground?
The manufacturer says most semi-inground installations sit about 12 inches below ground, with up to 36 inches of exposed wall.
We go deeper, setting every semi-inground pool at least 18 inches into the ground. More wall below grade means less wall to finish and a lower backyard profile.
The exact height of the raised wall depends on your property. On a flat yard, the wall stands at an even height around the entire pool. On a slope, the downhill side shows more wall, and the uphill side may sit close to the ground.
Semi-Inground vs Above-Ground vs Inground Pools
| Feature | Above-Ground Pool | Semi-Inground Pool | Fully Inground Pool |
|---|---|---|---|
| Where it sits | On top of the ground | Partly in, partly above | Fully below grade |
| Exposed wall | The full wall | Part of the wall, finished with rock or brick | None |
| Sloped yards | Needs a level pad | Built into the slope | Often needs a retaining wall and fill |
| Silverado Rock builds it | No | Yes, usually with a vinyl liner | Yes, in vinyl, fiberglass, or gunite |
| Our build time | Not offered | About 26 working days | 26 working days to 6 months, by type |
Families often ask whether they should buy an above-ground pool instead. Our answer stays the same: build the pool you want and the yard allows. For a deeper look at two of these options, read our semi-inground vs inground post.
Where a Semi-Inground Pool Makes the Most Sense
A semi-inground pool is not the right answer for every yard, but it shines in four situations.
Sloped Yards
Many yards in Jenks, Bixby, and South Tulsa fall away from the house. A fully inground pool on that kind of property often needs a retaining wall and fill dirt first. We price that work at $10,000 to $15,000 before we even start building the pool.
A semi-inground pool takes a different approach. We set it deeper into the high side of the hill, with the low side above ground as the rock face. Often, that raised side does the job a separate retaining wall would.
Rocky or Wet Ground
Hydra lists rocky ground and high water tables as good fits for semi-inground pools. Because part of the wall sits above grade, the pool needs less digging than a fully inground pool of the same depth.
In the Tulsa metro, buried rock is the one thing that can raise a quoted price.
Smaller Yards
Our OK Plunge is a 10x20 semi-inground pool that starts at $19,999, pool only. It leaves room for grass, a grill, and a place for the dog to run.
Families Who Want a Stone Look or a Raised Deck
Some families choose semi-inground for the appearance alone, since the raised wall can hold a waterfall, a bar, or a ledge for sitting. The wall can also meet a new or existing raised deck so that you can step straight from the deck into the water.
What Does a Semi-Inground Pool Cost?
Online prices for semi-inground pools vary widely, and the two-product problem explains why. Angi puts the 2026 national average at about $12,000, with most projects between $7,000 and $20,000. Treat those figures as national benchmarks, not Tulsa area prices. The same guide names a sunken above-ground pool as the cheapest path, so many of those numbers describe kits.
Why can a finished semi-inground pool cost less than a fully inground one? Hydra says its semi-inground wall kit costs about the same as an inground kit. The savings come from digging less dirt and hauling less of it away.
Here is what we charge across the Tulsa metro.
| What You Buy | Starting Price | What It Includes |
|---|---|---|
| OK Plunge (10x20) | $19,999 | Pool only |
| 14x28 semi-inground pool | $24,000 | Pool only, with finish items as add-ons |
| Rectangle or Freeform package (14x28) | $64,999 | Finished pool with rock surround, waterfall wall, snack bar, and 200 sq ft of deck |
Three costs sit outside every price: permit fees, dirt hauling, and an electrical panel upgrade if your home needs one. Your quoted price is fixed once you sign, with one exception. If the excavator hits buried rock, removing it adds cost. For the full breakdown, see our semi-inground prices post.
Pros and Cons of a Semi-Inground Pool
The Pros
- It works with slopes. On many sloped properties, the raised wall can do the job of a separate retaining wall.
- The wall becomes a feature. Families turn it into extra seating, a waterfall backdrop, or a built-in bar.
- It costs less to start. Our semi-inground pools start at $19,999 (pool only). Our fiberglass plunge starts at $45,000, and our gunite plunge starts at $55,000.
- It builds in weeks, not months. Most projects take about 26 working days once excavation begins.
The Cons
- The liner wears out. The vinyl liner is the main wear item on this pool type. We charge $5,900 to $9,200 to replace one, depending on pool size, liner thickness, and floor condition.
- The warranty is prorated. Hydra backs its liners with a 20-year limited, prorated warranty. Seam coverage is full only in the first year.
- The raised wall needs a finish. Rock or brick adds cost, and neither is included in the OK Plunge base price.
- Liners can puncture. Hydra makes liners in 20, 27, 28, and 36 mil thicknesses. We install 28 mil as standard. Families with big dogs can choose the 36 mil pet-friendly liner, which Hydra rates as puncture-resistant up to 50 pounds.
- You still need a fence and a permit. A raised wall does not replace the safety requirements that apply to every pool.
Safety, Fences, and Codes
A backyard pool brings joy, and it also brings real responsibility. CDC drowning facts show that more children ages 1 to 4 die from drowning than from any other cause.
A raised pool wall is not a safety fence. The federal Pool Safely barrier checklist calls for a fence at least 4 feet high around the whole pool. Gates should close and latch automatically, and a door or pool alarm helps when your house forms one side of the barrier.
Your city sets the exact fence requirements, so check them early and add a fence to your budget if you need one.
What It Costs to Own a Semi-Inground Pool
Construction is only part of the cost. Here is what ownership looks like.
Pump electricity. The pump runs more than any other piece of pool equipment, so we install variable-speed pumps that can run slowly for long periods. Certified ENERGY STAR pumps can switch speeds to match each task, and they run quieter than single-speed models.
Water care. For most families, we recommend Pristine Blue for the first year. If you still want saltwater after that, a salt system runs about $3,000.
Heating and cooling. A Jandy VersaTemp heat-and-chill unit is optional on our semi-inground pools. It costs about $6,000 installed, warms the water in spring and fall, and cools it in late July.
Liner replacement. Plan to replace the liner every 10-14 years. Hydra's guide to liner replacement signs covers what to watch for, such as fading, stubborn wrinkles, and a top edge slipping out of its track.
Winter closing. We recommend a full winter closing rather than running the equipment all winter. Our closing service starts at $350 and includes blowing out the lines. A new cover costs extra and is priced by pool size.
What I Recommend
When a family asks me what a semi-inground pool is, I don't start with a brochure. I start by walking the yard, because it tells me more than any price sheet.
If your lot slopes, I want to see it. Most homeowners assume a slope rules out a pool, but it often does the opposite. I set the pool deeper into the high side and let the low side stand up. That raised side gets real rock and a waterfall, and the worst spot in the yard becomes the place everyone gathers.
If your lot is flat, I'll tell you that too, because a fully inground vinyl pool or a fiberglass shell might suit your family better. I'd rather build the pool you'll love than sell you a pool type you don't need.
I've built pools around the Tulsa metro for 29 years. The same crews come back for every build, and I answer your questions from the first visit to the first swim.
Here's what matters most to me. A pool is where your kids learn to swim and where their friends show up every weekend. Those summers go by faster than anyone expects, so I build every pool to keep working long after the kids have grown up.
Frequently Asked Questions
What is a semi-inground pool?
A semi-inground pool is a permanent pool set partly into the ground, with the top of its wall above grade. You can finish the raised wall with rock, brick, or decking. Silverado Rock builds them with Hydra Samson 52-inch galvanized steel walls and a vinyl liner, set at least 18 inches into the ground.
How deep is a semi-inground pool?
Our semi-inground pools in Tulsa are 4 to 6 feet deep. Depths vary by location, and Angi lists most semi-inground pools at 3 to 8 feet. The final depth depends on the wall system and how much digging is needed.
How much of a semi-inground pool is above ground?
It depends on the yard. Hydra Pools says most of its installations sit about 12 inches below ground, with up to 36 inches exposed. Silverado Rock sets every semi-inground pool at least 18 inches into the ground. On a slope, the downhill side shows more wall.
What shapes do semi-inground pools come in?
The Hydra semi-inground line comes in rectangle, Grecian, lagoon, oval, and round shapes, with custom layouts available. Silverado Rock builds all of them. Our published prices cover the 10x20 OK Plunge and the 14x28 Rectangle and Freeform packages.
Can you dive into a semi-inground pool?
No. Our semi-inground pools are 4 to 6 feet deep and are not built for diving. Use the steps or a sun ledge to get in, and set a no-diving rule for every swimmer.
How long does a semi-inground pool last?
The vinyl liner wears out first, and with good water care, most liners last about 10 to 14 years. Silverado Rock charges $5,900 to $9,200 to replace one, depending on pool size, liner thickness, and floor condition.
Can a fiberglass pool be semi-inground?
Yes, but it costs more than setting the same shell fully in the ground. Unless your yard slopes, Silverado Rock recommends building a fully inground fiberglass pool. On a sloped yard, a semi-inground fiberglass pool can make sense.
Is a semi-inground pool the same as an above-ground pool?
No. A sunken above-ground kit uses light walls made for above-ground use and can sit on sand. An inground-grade semi-inground pool uses galvanized steel panels, buried plumbing, and stone backfill. The raised wall is then finished with rock or brick.
How much does a semi-inground pool cost in Tulsa?
Silverado Rock semi-inground pools start at $19,999 for the 10x20 OK Plunge (pool only). A 14x28 pool starts at $24,000 (pool only). The finished Rectangle or Freeform package is $64,999. Permit fees, dirt hauling, and an electrical panel upgrade cost extra.
Can you put a semi-inground pool on a slope?
Yes. Sloped yards are one of the best places for a semi-inground pool. The builder sets the pool deeper into the high side of the hill. The low side stands above the ground and gets a rock or brick face. That raised side can often replace a separate retaining wall.
Does a semi-inground pool need a fence?
Yes, in most cases. A raised pool wall is not a safety barrier. Pool safety requires a fence at least 4 feet high, with gates that close and latch automatically. Check your city's rules before you build.
Find the Pool That Fits Your Yard
A semi-inground pool can turn a sloped or small yard into the best spot on your street. It can also be the wrong fit if your yard and goals point elsewhere. The only reliable way to know is to start with your family and your property.
Take our Find My Pool quiz and answer a few quick questions about your yard, your family, and your budget. In about 90 seconds, you will see which pool type and features match your backyard.
