A semi-inground pool sits partly above grade and partly recessed into the ground — a genuine middle option between above-ground and full inground, and the most practical solution for a sloped backyard that can’t easily support either of the other two. This guide covers the real benefits, the design decisions specific to this pool type, and exactly how it solves a slope that would otherwise mean expensive retaining walls.
What Is a Semi-Inground Pool?
Semi-inground pools use a reinforced panel or frame structure — similar in concept to an above-ground pool, but built to heavier-duty specifications — with part of the wall (typically 2–4 feet) recessed below grade and the rest standing above it. This requires partial excavation, but far less than a fully inground pool, and the structure is specifically engineered to handle the uneven soil pressure that comes from being buried on one side and exposed on the other.
Benefits of Semi-Inground Pools
- Bridges the price gap. At roughly $20,000–$50,000 installed, semi-inground sits well below full inground pricing while looking considerably more built-in than a pure above-ground pool.
- The most practical solution for a sloped yard, covered in detail below.
- Faster installation than full inground, since excavation is partial rather than complete.
- A more permanent, finished appearance than above-ground, especially once decking and skirting are added.
- Less visual bulk in the yard than a fully above-ground structure, since only part of the wall stands above grade.
Solving Sloped Yards
This is where semi-inground genuinely outperforms the other two pool categories. On a sloped lot, a standard above-ground pool needs the ground levelled first, and a full inground pool often needs retaining walls — commonly $15,000–$20,000+ — to manage the grade change around the excavation.
A semi-inground pool works with the slope instead of against it: the structure can be set so the lower side of the yard meets the pool at or near grade, while the higher side sits with more of the wall recessed into the existing slope. This “stepping” approach means the yard doesn’t need to be flattened, and in many cases no retaining wall is needed at all — a meaningful cost avoidance on a sloped property.
A few things to plan for on a slope specifically:
- Drainage: water needs a clear path away from the structure on the downhill side, since standing water against the wall can undermine the installation over time.
- Grade limits: there’s a practical limit to how steep a slope can be before even a semi-inground design needs additional grading or structural support — a site visit will confirm what your specific yard allows.
- Access for installation equipment: sloped lots can also affect how equipment reaches the install site, similar to the access considerations on any pool project.
For broader guidance on building on a slope generally, see Pool Installation on a Slope.
Design Options
Exposure Ratio
How much of the structure sits above grade versus recessed is itself a design decision. A design with more of the wall buried looks closer to a full inground pool but requires more excavation and cost; a design with less buried is faster and cheaper but reads more like a standard above-ground pool. Your yard’s actual slope is usually the deciding factor, but within what your site allows, this ratio is worth discussing directly with your installer.
Shapes
Semi-inground pools are typically available in the same round, oval, and rectangular shapes as above-ground models, since they share a similar panel-and-frame construction approach.
Skirting and Finish
The exposed portion of the wall can be covered with skirting panels, stone veneer, or landscaping to visually blend the structure into the yard — this is often what determines whether a semi-inground pool reads as a deliberate design choice or simply a partially buried above-ground pool.
Decking for Semi-Inground Pools
Decking does more work for semi-inground pools than for either above-ground or full inground, because it has to resolve a height difference that neither of the other two types deals with in the same way:
- Wraparound deck at wall height: built level with the top of the exposed wall, similar to an above-ground pool deck, giving a consistent surface around the pool’s perimeter.
- Entry-only decking: a smaller deck section just at the entry point, with the rest of the wall left exposed or finished with skirting — a lower-cost approach if a full perimeter deck isn’t needed.
- Multi-level, stepped decking: following the slope itself, with the deck stepping down on the downhill side — often the most visually integrated option on a genuinely sloped lot, since it acknowledges the grade change rather than trying to hide it.
Materials follow the same general range as any pool decking — wood, composite, and stone all work, with cost typically running $3,000–$10,000 depending on size and material, similar to above-ground decking costs. A well-designed deck is often the single biggest factor in whether a semi-inground pool looks like a budget compromise or an intentional design choice.
Costs at a Glance
Semi-inground pools typically run $20,000–$50,000 installed, depending on size, structure quality, and how much excavation your specific slope requires. For more on how this compares to other compact options, see Cost to Install a Small Pool.
Is Semi-Inground Right for You?
Semi-inground is worth strongly considering if you have a sloped yard, want a more built-in look than above-ground without full inground pricing, or want to avoid the cost of retaining walls. See Best Pool Type to Install for the broader decision framework, or Above-Ground vs Inground Pools if you’re still weighing the two more traditional options first.
Frequently Asked Questions
What is a semi-inground pool?
A pool structure that sits partly above grade and partly recessed below it, using a reinforced panel system engineered to handle the uneven soil pressure from being buried on one side and exposed on the other.
How does a semi-inground pool work on a sloped yard?
It can be positioned to “step” with the existing slope — meeting the lower side of the yard near grade while recessing more of the wall into the higher side — often avoiding the need for retaining walls or full yard levelling.
How much does a semi-inground pool cost?
Typically $20,000–$50,000 installed, depending on size and how much excavation your specific slope requires.
Do semi-inground pools need special decking?
Not strictly required, but decking matters more here than for above-ground or full inground pools, since it has to resolve the height difference between the exposed and recessed portions of the wall. A wraparound, entry-only, or stepped multi-level deck are the three common approaches.
Is a semi-inground pool as durable as a full inground pool?
It’s more durable than a standard above-ground pool, thanks to heavier-duty construction, but doesn’t match the structural lifespan of a true inground pool — expect a multi-decade lifespan closer to a sturdy above-ground structure than to concrete or fibreglass.
Get a Slope-Specific Assessment
Whether semi-inground is the right fit depends heavily on your yard’s actual grade and soil conditions.
Contact Easy Pools at (647) 449-9512 for a free, no-obligation assessment of your sloped or budget-conscious backyard project.