How much does a kidney-shaped inground pool cost versus a rectangle in Ottawa?

A kidney-shaped inground pool in Ottawa typically costs 10 to 20 percent more than a comparable rectangular pool of the same surface area, translating to a premium of roughly $6,000 to $18,000 depending on the pool type and size. For a mid-range vinyl-liner pool in the 14-by-28-foot to 16-by-32-foot range, you're looking at approximately $60,000 to $80,000 for a rectangular pool versus $68,000 to $95,000 for a kidney shape — and understanding why the kidney costs more will help you decide whether the premium is worthwhile for your property.

The cost difference between kidney and rectangular pools stems from three primary factors: construction complexity, material waste, and equipment compatibility. A rectangular pool uses straight wall panels (steel or polymer) that are manufactured in standard lengths and join at simple 90-degree corners. The liner is factory-cut to precise dimensions and drops in with minimal custom fitting. A kidney shape requires curved wall panels that must be custom-bent on site or ordered in specific radii, more complex bracing to maintain the curves during backfilling, and a liner that's measured and cut with tighter tolerances to follow the organic shape without excessive wrinkling.

For vinyl-liner construction — the most popular pool type in Ottawa — the kidney shape premium breaks down roughly as follows. Wall system costs increase by $2,000 to $5,000 because curved panels require more material and labour to fabricate and install than straight sections. The liner itself costs $800 to $2,000 more because it's a custom pattern rather than a standard rectangle cut. Excavation costs increase by $1,000 to $3,000 because the irregular shape takes longer to dig accurately, and the operator must work more carefully to match the template. Concrete bottom and coping work adds another $1,000 to $3,000 due to the curved formwork and additional finishing labour.

For gunite (concrete) pools, the cost gap between kidney and rectangular shapes narrows somewhat in percentage terms but remains significant in dollars. A rectangular gunite pool in Ottawa runs $85,000 to $140,000, while a kidney shape of comparable size costs $95,000 to $160,000. Gunite construction is inherently more accommodating of curved shapes because the concrete is sprayed onto a rebar framework that can be bent into any configuration — there are no prefabricated panels to deal with. However, the curved rebar work, more complex forming, and additional hand-finishing on the interior plaster or pebble surface still add cost. The excavation premium is similar to vinyl-liner pools.

Fibreglass pools present a different cost equation entirely. Because fibreglass shells are manufactured in moulds, a kidney-shaped fibreglass pool actually costs about the same as a rectangular one of similar size — typically $55,000 to $85,000 installed in Ottawa. The mould exists, the shell is mass-produced, and the installation process is identical regardless of shape. However, fibreglass pools are limited to the sizes and shapes available from the manufacturer, and the largest kidney-shaped fibreglass shells max out at about 16 by 35 feet — which may or may not suit your Ottawa backyard.

From a practical standpoint, kidney-shaped pools offer real advantages on certain Ottawa lot configurations. The organic curves work naturally with irregular property lines, existing landscaping, and the setback constraints that limit pool placement on many Ottawa lots. A kidney shape can tuck into an awkward corner of the yard where a rectangle would waste space or violate setback requirements. The concave side of the kidney also creates a natural gathering area for patio furniture and lounging — a design feature that rectangular pools achieve only by adding separate curved decking.

Pool covers — both winter safety covers and automatic retractable covers — cost more for kidney shapes. A standard mesh winter safety cover for a rectangular pool runs $1,500 to $3,000 in Ottawa, while the same cover for a kidney shape costs $2,200 to $4,500 due to the custom panel layout and additional anchoring required to follow the curves. Automatic retractable covers, which are increasingly popular in Ottawa for extending the swimming season and reducing heating costs, are essentially rectangular by design and cannot easily accommodate kidney shapes. If an automatic cover is important to you, this alone may be reason enough to choose a rectangle.

Heating efficiency slightly favours rectangular pools because the regular shape creates more predictable water circulation patterns, allowing the return jets and skimmers to be positioned for optimal flow. Kidney pools can develop dead zones in the concave sections where water doesn't circulate as efficiently, potentially requiring an additional return jet ($200 to $500 installed) and slightly more runtime on the circulation pump. Over an Ottawa swimming season, the heating cost difference is modest — perhaps $100 to $250 more per season for a kidney shape — but it adds up over the life of the pool.

Maintenance differences between the two shapes are modest but real. Rectangular pools are easier to vacuum (whether manually or with an automatic cleaner), easier to measure for chemical dosing because the volume calculation is straightforward, and easier to cover and uncover. Kidney pools tend to collect more debris in the concave section due to reduced water flow in that area, and automatic pool cleaners sometimes have difficulty navigating the tight curves — though modern robotic cleaners handle kidney shapes much better than the pressure-side and suction-side cleaners of a decade ago.

The resale value impact of pool shape is minimal in the Ottawa market. Real estate data doesn't differentiate between pool shapes in valuation, and buyer preferences are highly subjective. A well-maintained, properly landscaped pool of either shape adds approximately the same value to an Ottawa home. The more important resale factors are pool condition, equipment age, and how well the pool integrates with the overall backyard design.

For most Ottawa homeowners building a new pool, the decision between kidney and rectangular comes down to aesthetics and lot fit rather than pure economics. If you prefer the organic, natural look and your lot shape favours curves, the 10 to 20 percent premium for a kidney shape is a reasonable investment in a feature you'll enjoy for decades. If you want the most pool for your dollar, prefer clean modern lines, or plan to install an automatic cover, the rectangle delivers better value and functionality. Either shape, built by a qualified Ottawa pool contractor with proper engineering for our frost depth and soil conditions, will provide reliable service through decades of Ottawa winters.