Semi-Inground Pool vs Inground Pool: What Tulsa Buyers Must Know

Imagine a Saturday in July: the kids are in the water by ten, and you are reading poolside instead of driving to the public pool. Most families who call us already have that picture in mind.

What they do not have yet is a clear answer to one question: should the pool sit fully in the ground, or partly above it? We build both: our  semi-inground pools rise partly above the yard, while our inground pools sit flush with the deck. Each can give your family that Saturday, but they get there differently.

This guide compares the two side by side. You will see what each pool is, what it costs in Tulsa, how long it takes to build, and how it handles a sloped yard. By the end, you should know which pool type deserves a closer look for your own backyard.

What Is a Semi-Inground Pool?

A semi-inground pool sits partly below ground and partly above. We build every semi-inground pool with a steel wall and a vinyl liner, and each one extends at least 18 inches into the ground.

We face the exposed wall with natural rock or decorative brick, so it reads as a raised stone feature instead of a plain panel. Our semi-inground pools run 4 to 6 feet deep, and from inside, they feel much like any other pool. They are built for swimming, floating, and play, but not for diving.

Is a Semi-Inground Pool the Same as an Above-Ground Pool?

No, the two names sound alike, but they describe different products at different prices.

Most online price guides blend the two, and  Angi's cost guide lists a national average of about $12,000 for a semi-inground pool. Most homeowners in Angi's data pay between $7,000 and $20,000. Those figures are national benchmarks, not Tulsa quotes, and decks and other features cost extra.

Many pools in that price range are above-ground kits lowered partway into a hole, often with thin walls, few finish options, and no decking. A kit can make sense for some families, especially on a tight budget.

A custom semi-inground pool is a permanent build with a full excavation, a stone base, a finished rock or brick face, and a concrete deck. If you are weighing the two, our guide to  kits vs custom builds walks through the trade-offs in detail.

What Is an Inground Pool?

An inground pool sits fully below grade, so the top edge lines up with the deck and the surrounding yard. You walk up to the edge and step down into the water.

Inground pools come in three main types, and each is built differently.

Fiberglass: A fiberglass pool arrives as one finished factory shell, and the crew sets it into the dig in one piece. Our  fiberglass pools sit on a bed of 3/8 chip stone, and we backfill around the shell with the same stone. We bring in a crane only when the shell cannot reach the backyard any other way, such as in a narrow side yard.

Gunite: We build a gunite pool entirely on site, where the crew digs the shape, ties steel rebar, and sprays concrete to form the shell. We build our custom  gunite pools with an 8-inch shell so that the pool can take almost any shape.

Vinyl liner: A fully inground vinyl liner pool uses the same wall-and-liner system as a semi-inground pool, except the whole wall sits below grade.

All three inground types need a level spot to sit on, which is easy on a flat yard. On a sloped yard, someone has to build that level spot, and we cover what that work costs later in this guide.

Semi-Inground vs Inground: Side-by-Side Comparison

This table compares our semi-inground pools with our three inground pool types. These are starting prices and reflect our current Tulsa packages.

Feature	Semi-inground vinyl liner	Inground vinyl liner	Inground fiberglass	Inground gunite
Where it sits	Partly above grade	Fully below grade	Fully below grade	Fully below grade
Starting price	$19,999 pool only (10x20)	$45,000	$45,000 (plunge)	$55,000 (plunge)
Price range	Up to about $65,000 finished	Up to about $65,000	$45,000 to $90,000	From $100,000 (full size)
Build time	About 26 working days	About 26 working days	4 to 6 weeks	3 to 6 months
Main wear item	Liner, every 10 to 14 years	Liner, every 10 to 14 years	Gel coat surface	Interior finish
Retaining wall on a slope	Usually not needed	Usually needed	Usually needed	Often needed
Crane needed	No	No	Only if access is narrow	No

What Each Pool Type Costs in Tulsa

Price is usually the first thing families compare, and the trick is to compare the same scope of work. A pool-only price and a finished backyard price are two separate numbers.

Semi-Inground Pool Cost

Our OK Plunge, a 10x20 semi-inground pool, starts at $19,999, and a larger 14x28 semi-inground pool starts at $24,000. Both prices cover the pool only, so everything around it, from decking to rock work, is an add-on.

Our Rectangle and Freeform semi-inground packages run about $65,000 finished. Each package includes the pool shell, vinyl liner, excavation, pump, filter, stone backfill, and pool startup. It also includes a natural rock surround, a 3-foot waterfall wall, a poolside snack bar, and 200 square feet of concrete decking.

For a full breakdown of what moves that number, see our guide to  semi-inground pricing in Tulsa.

Inground Pool Cost

Our fiberglass pools start at $45,000 for a plunge model. Small fiberglass pools start at $50,000, medium pools start at $55,000, and large pools start at $65,000. The full fiberglass range runs from $45,000 to $90,000, and every price includes waterline tile to help prevent fading and chalking at the waterline.

A gunite plunge pool starts at $55,000, and a full-size custom gunite pool starts at $100,000. Gunite costs more because the crew builds the entire shell by hand on site.

A fully inground vinyl liner pool starts at $45,000 and tops out near $65,000, depending on its size.

Costs Outside the Pool Price

Some costs depend on your yard and city, so they aren't included in every package price. Plan for these items when you compare quotes:

• Permits: your city sets the fees.
• Dirt hauling: soil that leaves your property costs extra.
• Crane service: you need a crane only when you have to lift the fiberglass shell over the house.
• Electrical panel upgrade: some homes need a larger panel for pool equipment.
• Extra decking: concrete beyond the package amount runs $17 to $21 per square foot.

One more cost can change the whole comparison, because an inground pool on a sloped yard often needs a retaining wall before construction begins. That cost has its own section below.

How Long Each Pool Takes to Build

If you want that July Saturday next summer, the build schedule matters as much as the price.

Semi-inground vinyl liner: about 26 working days of construction once excavation begins.

Fully inground vinyl liner: about 26 working days, the same schedule as a semi-inground pool.

Inground fiberglass: 4 to 6 weeks, including delivery of the finished shell from the factory.

Inground gunite: 3 to 6 months from the day you sign the contract, with permits inside that window.

Permits come first for every pool type and take anywhere from one week to about four weeks, depending on the city. Our guide to Tulsa-area  pool permits explains the process for Tulsa, Broken Arrow, Jenks, Bixby, and Owasso.

Rain can also push back a build date, since heavy spring rain can turn a dig site into mud for days at a time. That delay costs you time on the calendar, but it does not add dollars to your contract.

Before anyone digs, the builder must request utility locates through  OKIE811 . The request must be submitted at least three business days before digging begins. A good builder handles this step for you, but it is still smart to ask.

How Each Pool Handles a Sloped Tulsa Yard

This is where the comparison gets local, because many Tulsa backyards fall away from the house toward the back fence.

That pattern exists because builders grade new lots so rain drains away from the foundation.  OSU Extension explains that soil should slope outward from a house so water doesn't pond against it. So the slope you see from your patio may have been built that way on purpose.

Inground Pool on a Slope

An inground pool needs a level platform, so the crew cuts into the high side, builds up the low side, or both.

Building up the low side usually means a retaining wall with compacted fill behind it. On a sloped Tulsa lot, the retaining wall and fill for a full inground pool run $10,000 to $15,000. That money goes into the ground before work on the pool itself even starts.

Taller walls bring more permit rules, and the City of Tulsa  site plan guidebook says walls up to 4 feet need a zoning clearance permit. Walls taller than 4 feet require a building permit and an engineer-sealed design.

Semi-Inground Pool on a Slope

A semi-inground pool works with the slope instead of fighting it. On a hillside, we set the pool deeper into the high side. The low side shows more of the wall, and we finish that face with rock or brick.

Because the pool walls hold the water, the low side doesn't need a separate retaining wall. That is why a semi-inground pool often costs less than an inground pool on the same sloped lot. The grade change that worried you becomes a stone wall your family can sit on.

No Single Slope Cutoff

Families often ask how much slope is too much, but no single number fits every yard. Two lots that look the same from the street can behave differently once someone measures the drop, the soil, and the path rainwater takes.

That is why we measure every yard in person before we recommend a pool type. A semi-inground pool is a strong option on many sloped lots. Fiberglass and gunite pools also work on slopes when the site work is planned well.

"The overall knowledge and experience Jason has of pools far exceeds anyone else I have talked to in the pool business. He came out and went through the whole process with me."

Dan R. Duckwall, Tulsa

Does Tulsa Clay Soil Favor One Pool Type?

No, any pool type can go into Tulsa clay; the build determines how well a pool handles the ground, not the pool type.

Clay soaks up water slowly and shrinks in long dry spells, so the base, backfill, and drainage matter most. We set our fiberglass and semi-inground pools on 3/8 chip stone and backfill with it too. Chip stone locks together when compacted and drains freely, while sand can hold water and shift over time.

To check the soil under your own yard, look it up by address in the free USDA  Web Soil Survey .

Design and Everyday Use

The biggest difference you will notice every day is how each pool looks and feels from the yard.

An inground pool sits level with the deck, so the water lines up with the patio and the lawn. You can walk straight from the deck to the edge, step in, and enjoy a clean, classic look that suits almost any home.

A semi-inground pool stands out in the yard, and its raised wall becomes the focal point, especially when faced with natural rock. Our Rectangle and Freeform packages add a 3-foot waterfall wall, so you hear the water before you see it.

"The design was beautiful and well thought out."

Keith Martin, Tulsa

The raised wall also changes how people use the pool. Parents can sit on the ledge with their feet in the water while the kids swim. That ledge is where the Saturday from the start of this guide happens.

Inground pools win when you want a flush, open deck or features like a beach entry. Custom gunite gives you the most freedom, since the crew can shape it to almost any design.

Some families want a vanishing edge, where water spills over one side into a catch basin. Gunite pools can do this, and some fiberglass models offer a true infinity edge. A sloped yard helps either option, since the drop is already there.

Lifespan and Upkeep

Every pool needs some care over the years, but where that care goes changes from one pool type to the next.

Semi-Inground and Vinyl Liner Pools

The vinyl liner is the main wear item on a semi-inground pool, and a liner typically lasts 10 to 14 years. Our standard liner is 28 mil thick, and families with dogs can choose a 36 mil pet-friendly liner that resists punctures better.

Our liners come from Hydra Pools, which backs them with a 20-year limited, prorated warranty against seam separation. Full coverage applies only in the first year, and coverage drops after that. When a liner wears out, replacement in Tulsa runs $5,900 to $9,200, depending on pool size, liner thickness, and floor condition.

Fiberglass Pools

A fiberglass shell that is installed correctly on a chip stone base should last 50 years or more. The gel coat on the surface is what wears. Our shells come from Leisure Pools, whose  limited warranty covers water loss from manufacturing defects or osmosis. That coverage lasts for the original buyer's lifetime, and never less than 35 years.

Gunite Pools

A gunite shell is strong and built to last for decades, but like any pool finish, its interior surface wears with time. Ask any builder how long the finish should last and what refinishing will cost.

What Upkeep Costs Over 30 Years

A fair comparison looks beyond the day the pool is finished; over 30 years, a vinyl liner pool will likely need two new liners. At today's Tulsa price of $5,900 to $9,200 each, that adds roughly $11,800 to $18,400 over the pool's life. Those are today's dollars, so future prices may run higher.

A fiberglass shell should not need replacing in that time, though its gel coat surface wears with age. A gunite pool needs its interior finish redone over time, so ask what that work costs and how often it's due.

A lower price on day one can still be the right call for your family. Include the liner cost in your budget from the start, and the numbers won't surprise you.

Equipment matters for every pool type, and we install Jandy equipment as standard on our fiberglass and gunite pools. On semi-inground pools, a variable-speed pump is standard, and Jandy equipment is optional.

Questions to Ask Before You Choose

A good builder should answer every one of these questions clearly before you sign anything. If a builder cannot answer them, they have not studied your yard yet.

• How far does my yard drop across the pool and deck area? The answer shapes which pool type makes the most sense for your lot.
• Does this quote include a retaining wall, fill, and dirt hauling? On a sloped yard, these items can change the total by thousands of dollars.
• What goes under and around the pool? Ask what the base and backfill are made of, and how the builder compacts them.
• Where will rainwater go after the pool is built? A clear drainage plan protects the pool, the deck, and your neighbors.
• Is this a pool-only price or a finished price? Make sure every quote you compare covers the same scope of work.
• Who handles permits and utility locates? Your builder should manage both, and the timeline should account for them.

Which Pool Fits Your Yard?

There is no single best pool type. There is only one best pool for your yard, budget, and family, so use these lists as a starting point.

A semi-inground pool may fit if:

• Your yard has a noticeable slope that drops away from the house.
• You want a finished backyard, with rock, decking, and a waterfall, in one package price.
• You want to swim within a single season of signing.
• You like the look of a raised stone wall and a waterfall.
• You want a built-in ledge where parents can sit with their feet in the water.

A fiberglass inground pool may fit if:

• Your yard is flat, or you can budget for a retaining wall.
• You want a smooth, nonporous surface under your feet.
• You want a flush deck edge all the way around.
• You want a durable shell backed by a long structural warranty.

A gunite inground pool may fit if:

• You want a fully custom shape, size, or depth that no factory mold offers.
• You want features like a grotto, a swim-up bar, or a vanishing edge.
• You have the budget and the patience for a longer build.

If you cannot decide between two pool types, that is normal, and most families narrow it down after someone measures the yard with them.

What I Recommend

I've built all of these pools, and I tell every family the same thing on a first visit. Don't pick a pool type from a price chart. Pick it after someone has walked your yard.

If your yard drops away from the house, I'll price a semi-inground pool first. It sits into the hillside, and the low side turns into a rock wall. You also skip the $10,000 to $15,000 retaining wall a full inground pool needs. You can put that money into the deck, a waterfall, or a heat-and-chill unit instead.

But a slope doesn't pick your pool for you. Your family does. Want a smooth fiberglass pool on a sloped lot? We'll build the retaining wall and set the shell on a solid chip stone base. If you want a custom gunite pool with a vanishing edge, a slope gives us room to build something special.

On a flat yard, I'd look hard at fiberglass. It goes in fast, and the shell lasts decades when the base is right.

Silverado Rock is a pool builder in Tulsa, Oklahoma, led by a builder with 29 years of experience. We are a member of the Pool and Hot Tub Alliance ( PHTA ). We build semi-inground, fiberglass, and custom gunite pools in Tulsa, Broken Arrow, Bixby, Jenks, Owasso, Coweta, Glenpool, Sand Springs, Sapulpa, Claremore, Collinsville, and Wagoner.

Frequently Asked Questions

Is a semi-inground pool cheaper than an inground pool?

Often, yes, especially on a sloped Tulsa yard. A 10x20 semi-inground pool starts at $19,999 for the pool only, while a fiberglass plunge pool starts at $45,000. On a slope, a full inground pool usually needs a retaining wall and fill that run $10,000 to $15,000, which a semi-inground pool avoids.

Is a semi-inground pool the same as an above-ground pool?

No. An above-ground pool is usually a kit that sits on a level pad. A custom semi-inground pool goes at least 18 inches into the ground, sits on a stone base, and gets a finished rock or brick face. It is a permanent pool, not a temporary one.

How deep is a semi-inground pool?

Our semi-inground pools run 4 to 6 feet deep, which works well for families who want to play, float, and swim. Each pool sits at least 18 inches below grade, and the rest of the wall stands above grade.

Can you dive into a semi-inground pool?

No. Our semi-inground pools are 4 to 6 feet deep and aren't built for diving. If diving matters to your family, ask about a custom gunite design.

How long does it take to build a semi-inground pool?

Construction takes about 26 working days once work begins. Permits come first and take 1 to 4 weeks, depending on your city. By comparison, a fiberglass pool takes 4 to 6 weeks, and a custom gunite pool takes 3 to 6 months.

Can you put a semi-inground pool on a sloped yard?

Yes. A sloped yard suits a semi-inground pool well because we set the pool deeper on the high side, and the low side shows more wall. Because the pool walls hold the water, the low side needs no separate retaining wall.

Does a raised pool wall replace a pool fence?

No. A raised wall can help keep small children away from the water, but it does not replace a proper barrier. The Pool Safely  barrier checklist recommends a fence at least 4 feet tall around a home pool, and your city sets the final code.

Inground vs semi-inground pool: which lasts longer?

A fiberglass or gunite shell can last for decades. A fiberglass shell on a solid chip stone base should last 50 years or more. On a semi-inground pool, the vinyl liner is the main wear item and typically lasts 10 to 14 years. Replacement in Tulsa runs $5,900 to $9,200.

Which pool type is best for Tulsa clay soil?

Any pool type can go into Tulsa clay, because the build decides how a pool handles the ground. A compacted stone base, solid backfill, and a drainage plan matter far more than whether the pool is semi-inground, fiberglass, or gunite.

Find the Right Pool for Your Yard

That Saturday in July starts with one choice, and your yard already holds the answer. Take the  Perfect Pool quiz , tell us about your yard and family, and see which pool type best fits your home.