Rectangular vs Grecian pools compared
Rectangular vs Grecian pool, side by side: figures at the same nominal size, strengths, trade-offs and a straight recommendation.
The Grecian is the rectangle's straight-edged cousin: instead of rounding the corners into a curve, it clips each one off at 45°, turning four right angles into an eight-sided outline. There isn't a single curve anywhere on the pool — every wall, including the four short diagonal ones, is dead straight. That single fact is what separates it from the rounded rectangle, the oval and the Roman: the Grecian softens a rectangle's institutional edge without ever asking a builder to form a curve.
The corner cut is small — about a metre along each wall on an 8 × 4 m pool — and it sits at the extreme width, well clear of the centre line, so swimming barely notices it at all. What changes is the pool's geometry: eight walls and eight angles instead of four, a formal, crystalline outline instead of a plain box, and corners that now face 45° into the garden instead of square into it — which turns out to be a genuinely useful detail for steps, benches and planters.
- Straight wall segments an octagonal Grecian has, against a rectangle's four
- 8 vs 4Straight wall segments an octagonal Grecian has, against a rectangle's four
- Water surface of an 8 × 4 m Grecian, against the rectangle's 32.0 m² (about 6% less)
- 30.2 m²Water surface of an 8 × 4 m Grecian, against the rectangle's 32.0 m² (about 6% less)
- Length of each 45° corner cut on an 8 × 4 m Grecian, measured along the wall
- ≈ 1 mLength of each 45° corner cut on an 8 × 4 m Grecian, measured along the wall
- Perimeter — and so coping — versus the rectangle at the same footprint (21.8 vs 24.0 m)
- −9%Perimeter — and so coping — versus the rectangle at the same footprint (21.8 vs 24.0 m)
Rectangular
The classic — clean lines, maximum swim length
Strengths
- Most usable swim length per square metre
- Simplest to build, tile and cover
- Automatic and slatted covers fit perfectly
Trade-offs
- Sharp corners collect debris in the corners' eddies
- Can feel formal in a soft, planted garden
Grecian
Cut corners, octagonal poise — formal without curves
Strengths
- Formal geometry with straight-cut simplicity
- Nearly a rectangle's swim length and floor area
- Angled corners suit corner steps and benches
Trade-offs
- Eight wall angles mean more formwork joints
- Corner cuts reduce floor space slightly
At a glance
| Rectangular | Grecian | |
|---|---|---|
| Nominal size | 8 × 4 m | 8 × 4 m |
| Water surface | 32.0 m² | 30.2 m² |
| Volume | 48.0 m³ | 44.9 m³ |
| Perimeter | 24.0 m | 21.8 m |
| Footprint efficiency | 100% | 94% |
Swimming: the corner cut never reaches the lane
The 45° cut only touches the pool at its widest points, right where the walls meet — it never comes near the centre line, so an 8 × 4 m Grecian swims the full 8 m exactly like a rectangle does, corner cut or not. The rectangle holds 32.0 m² of water at that size; the Grecian holds about 30.2 m², a loss of roughly 6% concentrated entirely in four small triangles at the corners, none of which anyone was swimming through anyway.
That 6% is worth comparing to the rounded rectangle's roughly 2.5%, because the two shapes are answering the same question — soften the box a little — in different currencies. A circular fillet of a given reach removes noticeably less floor than a straight 45° cut of the same reach; the Grecian trades a bit more area for a look that has no curve in it anywhere. Neither loss is one you'll feel while swimming a length.
How each one sits in the garden
A plain rectangle is neutral — it doesn't ask the garden to be anything in particular. A Grecian asks for a little more: its eight straight edges and crisp diagonal corners read as formal and deliberate, the kind of geometry that rewards a garden plan built on symmetry and an axis — a central path, matching beds either side, a house with real architectural detailing rather than a plain box.
The detail that makes the Grecian earn its keep is what happens at the cut corners themselves. A 45° corner is an easy, natural place to set a corner bench, a wide corner step, or a planter, angled to face into the pool rather than tucked awkwardly into a hard 90° — something a plain rectangle's corners never quite offer without extra masonry. In a symmetric, formal garden that's a real, usable upgrade, not just a different outline.
Construction: no curves, but more angles
Here's the part that surprises people: the Grecian needs no curved formwork at all. Every one of its eight walls, including the short diagonal cuts, is a straight panel — no bent shuttering, no template to spray against, no radius-cut coping anywhere. Per linear metre, a straight diagonal cut is no harder to build than a straight side wall; it's simply set out at a different angle.
What it does add is joints. A rectangle has four corners to get right; a Grecian has eight, each one a mitred angle where two panels and two courses of coping meet precisely. More angles mean more measuring, more cutting and slightly more labour in the setout, even though no single piece of that labour is technically harder than building a plain corner. On an 8 × 4 m pool the total perimeter actually drops to about 21.8 m against the rectangle's 24.0 m — roughly 9% less wall and coping overall — so the premium is entirely in the extra joints, not in extra material.
Covers and cleaning
A rectangle's automatic slatted cover is the reference case: straight run, straight housing, no adjustment needed. The Grecian needs the same kind of adjustment a rounded rectangle does — a small custom-shaped piece of slats or panel at each of the four corners — except the cut here is a clean, straight diagonal rather than a curve.
That straight-line cut is, if anything, the simpler of the two jobs for a cover maker: a diagonal is a single cut, where a curved corner needs the slats shortened in a stepped or tapered pattern to follow the radius. A solar blanket is trimmed to the octagon in minutes either way. Cleaning is close to a wash between the two shapes — the Grecian's corners are angled rather than eliminated, so they still want the occasional pass of a brush or robot, just less aggressively than a true 90° corner does.
Cost and the long view
Running costs are close: at typical family depths the Grecian holds about 45.2 m³ against the rectangle's 48.0 m³, a small, genuine saving on heating and chemicals that roughly tracks its smaller area. Build cost sits a step above the rectangle and a step below the Roman or a true curve — the extra corner joints and small custom cover pieces add a moderate premium, not a dramatic one, since there's no curved formwork to pay for.
For resale, the rectangle remains the safest neutral choice, but the Grecian isn't a style risk the way a strongly curved or free-form shape can be — crisp, straight geometry ages calmly, and it doesn't commit a garden to curves the next owner might not want. It's a confident middle ground: more considered than a plain box, without the long-term style bet a Roman or kidney represents.
Choose the rectangle if… / choose the Grecian if…
Choose the rectangle if you want the simplest, cheapest build available, if the garden has no particular symmetry to reward, or if you'd rather not think about eight coping angles instead of four.
Choose the Grecian if the garden plan is genuinely symmetric and axial, if you want a formal look without committing to a single curve anywhere on the pool, or if you like the idea of corner steps or benches set naturally at 45°. Put both at 8 × 4 in the designer and rotate the view toward the corners — the difference between a right angle and a clipped one is small on paper and surprisingly noticeable in 3D.
Nearly identical to swim in; the Grecian buys a formal, octagonal presence for slightly more formwork and slightly less floor. If your garden plan is symmetric and axial, the Grecian rewards it; otherwise the rectangle's simplicity wins.
Frequently asked questions
- Does the Grecian's corner cut affect the swim lane?
- No. The cut only touches the pool at its widest points, at the corners — the centre line stays a full, uninterrupted 8 m on an 8 m pool, exactly like a rectangle.
- How much floor area does the Grecian give up?
- About 6% at an 8 × 4 m footprint — 30.2 m² against the rectangle's 32.0 m². That's more than a rounded rectangle loses at the same corner size, because a straight 45° cut removes more area than a circular fillet.
- Is the Grecian harder to build than a rounded rectangle?
- Differently hard, not more. It needs no curved formwork at all, but it does need eight precise mitred corners instead of four — more setout and coping cuts, though every piece stays straight.
- Can a Grecian pool take an automatic cover?
- Yes, with a small custom-cut piece of slats at each of the four corners — a straight diagonal cut, which is simpler to make than the tapered slats a curved corner needs.
- What's the Grecian actually good for that a rectangle isn't?
- A formal, symmetric garden with a real axis, and corners that naturally host a step, bench or planter angled into the pool — something a plain rectangle's square corners don't offer without extra work.
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