Rectangular vs L-shape pools compared

Swimming and playing: one room or two

In a plain rectangle, everyone shares the water and takes turns. An 8 × 4 m family rectangle gives 8 m of lane, but it is one lane — a lap swimmer doing turns is now negotiating a lilo and a beach ball, and a rule that keeps kids out of the deep end while someone swims never quite holds for a whole summer.

An L-shape actually separates them. Size the long leg at 9 × 3 m and the short leg as a 3 × 3 m bay, and the swimmer gets a genuine 9 m run while the children have their own water — steps, standing depth, a lilo — entirely out of the lane. The two legs share one pump and one filter, but they behave like two pools.

The trade sits at the inner corner, where the two rectangles meet. That corner is outside both legs' natural flow, so it needs its own return inlet aimed straight at it, or the water there goes quiet and starts to look tired before the rest of the pool does. It is a detail, not a flaw, and any builder who has done a few L-shapes already prices it in.

How each one sits in the garden

A rectangle is a simple box. Set parallel to a terrace or a house wall, it looks intended; set at an angle to everything, it looks dropped in. It doesn't ask anything of the garden beyond a flat, rectangular patch.

An L-shape asks for a corner — a terrace corner, a house corner, an L-shaped plot — to wrap around. Given one, it looks resolved, almost architectural, as if the pool grew out of the building line rather than being set down next to it. Without one, the short leg can read as an add-on rather than a second room; it has nothing to answer to.

The practical test: stand at the spot where the terrace or the house actually turns a corner, and ask whether the pool could wrap it. If the answer is yes, the L-shape has a natural home. If your garden is a plain rectangle of lawn with no inside corner anywhere, the rectangle pool matches it and the L-shape has to invent a reason to be there.

Building it: two rectangles cost more than one

None of an L-shape's walls are hard to form — every one of them is straight, the same standard panels and rebar spacing a plain rectangle uses. The difference is simply that there are more of them. For the same volume of water, an L carries roughly 15–20% more perimeter wall than a single rectangle, and every extra metre is formwork, waterproofing, coping and waterline tile, whether it curves or not.

The inner corner is the one genuinely fiddly part: a 90° internal angle rather than the four external corners a rectangle has, and it needs a return inlet of its own aimed into the corner, or that pocket of water sits outside the main circulation loop.

Size matters more here than with most shapes. Split roughly 18 m² of water into two legs and each one is too small to do its job — the swimmer doesn't get a real lane and the shallow bay doesn't get real space to play in. Above that, both legs start to earn the extra wall they cost.

Covers and cleaning

A rectangle takes an automatic slatted cover exactly as it comes: one rectangular housing, two straight rails, a perfect fit. It is the single strongest practical argument for the shape.

No single rectangular cover fits an L, but because every wall in it is straight, the pool doesn't need a fully bespoke shape the way a curved free-form does. Most builds solve it one of two ways: two separate slatted covers, one per leg, meeting at the inner corner, or one safety cover or solar blanket cut to the full L. Either way, budget for a genuine premium over a single rectangle's cover — and for two housings cast into the shell if you choose two covers.

Cleaning is close to a wash: an L-shape has six corners against a rectangle's four, so there are more places for debris to settle overall, but a robot cleaner handles straight walls just as well in either leg. The inner corner is the one spot that wants help from circulation rather than from the robot.

Cost drivers, summed up

The wall premium is the main one — roughly 15–20% more perimeter than an equivalent rectangle — and the cover is the second, whether that's two units or one bespoke shape. Both are real and both are paid once, at the build.

Working the other way: volume follows floor area and depth, not outline. A 36 m² L-shaped pool costs about the same to heat, treat and pump as a 36 m² rectangle — the extra spend is in the wall around the water, not the water itself. Put a rectangle and an L of the same overall footprint into the designer and compare the computed volume; the gap you see is almost entirely the notch of dry garden the L leaves at the junction, not a difference in what you're paying to run.

Living with it: resale and the long view

A rectangle is the universal choice — it fits the next owner's household as readily as it fits yours, whatever shape that household takes. An L-shape is a bet on a particular way of living: a swimmer and small children sharing one pool at the same time. If the next owner's household looks similar, it reads as clever design. If it doesn't, the zoning that felt essential to you can just look like an odd corner of unused water to them.

A well-resolved L — one that genuinely wraps a corner of the house or terrace — ages as architecture rather than as a trend, and that holds up regardless of who lives there next. As always, buyers respond far more to a warm, clean, well-run pool than to its outline.

Choose the rectangle if… / choose the L-shape if…

Choose the rectangle if the household has one real use for the pool — either everyone swims or nobody seriously does — if the garden is a plain box, if you want the simplest possible automatic cover, or if the budget is tight.

Choose the L-shape if a swimmer and small children genuinely need to use the water at the same time, if the garden or terrace has a real corner for the pool to wrap, and if you're prepared to pay for the extra wall and the two-part cover to get two rooms' worth of use from one pool.

If you like the idea of zoning but not the hard right angle, look at the lazy L: the same split between a swim leg and a play leg, with the junction eased into an angle instead of a square corner, which sits more comfortably in an informal or sloping garden.