What each footprint runs in the Conejo Valley, from an 8 x 16 spool to a 20 x 40 estate pool, and why cost does not scale in a straight line with size.
Home Pool Cost by Size
The table
| Pool size | Gunite base range, flat lot | Where it fits |
|---|---|---|
| 8 x 16 ft spool | $60,000–$80,000 | The smallest yards; pool and spa in one heated body of water |
| 10 x 20 ft spool / plunge | $60,000–$85,000 | Compact tract yards, side-yard conversions |
| 12 x 24 ft | $78,000–$118,000 | Smaller tract yards, Newbury Park and Oak Park lots, plunge conversions |
| 14 x 28 ft | $88,000–$132,000 | The common family size in Thousand Oaks and Camarillo |
| 16 x 32 ft | $98,000–$152,000 | Laps and games with room to spare, Westlake and Agoura lots |
| 20 x 40 ft | $128,000–$195,000 | Estate lots, Lake Sherwood, Calabasas, Encino |
Base ranges are gunite pools on a flat lot with the standard equipment set, permits, startup, and the first 300 sq ft of decking included, the same bases the calculator uses, updated October 2026. A spa, slope, extra decking, and features add on top; the cost guide prices each add-on in its own table. Spool rows are the calculator's plunge scaling applied to the smallest footprints.
A base range is the pool before your lot argues with it. Slope adds $8,000–$18,000 at the calculator's sloped setting and $25,000–$55,000 at hillside. Narrow access adds $5,000–$12,000. Those site lines, not the footprint, are where two same-size pools end up $40,000 apart.
The spool and plunge rows exist because a smaller pool often leaves a better yard: deck, planting, and shade survive the build. Plenty of Conejo projects get better when the water gets smaller. The plunge pools and spools page covers the small end properly.
Size questions
Because the expensive parts do not scale with water area. Excavation mobilisation, steel, plumbing runs, the equipment set, permits, and the safety features cost nearly the same for a 12 x 24 as for a 16 x 32. What scales is shell material, finish area, and decking. That is why doubling the water roughly adds a third to the base, not double, in the calculator's math.
Most tract builds here land at 12 x 24 to 16 x 32 ft of water, after setbacks, the pool enclosure, and a usable deck band come out of the yard. Newbury Park and Oak Park tracts trend to the smaller end; Westlake, Agoura, and Lake Sherwood lots take the larger sizes. The 3D design settles it for your lot, on paper, before anyone digs.
More water means more heating, more chemicals, and more filter time, in that order. The gap between a 12 x 24 and a 20 x 40 is real but second-order next to the build cost. The maintenance cost page breaks running costs down as planning ranges.
Run the ballpark in two minutes, or book the free design consultation and get a 3D design with a line-item estimate for your lot.