20×40ft

6.1 × 12.2 m

Water system

One push dumps the pool into holding tanks. The polish tank filters the water before it comes back.

Hold0 gal

Polish0 gal

Water is in the pool.

Temperature

84°F · 29°C

Site plan, to scale. Shallow end toward the north. House along the south line.

56 × 72 ft lot

Fits the lot, with about 2,368 sq ft of yard outside the footprint.

Waterline: 800 sq ft
Gallons: 29,922
Coping: 120 ft
Deck: 864 sq ft
Water weight: 124.8 tons
Fill, 9 gpm: 55.4 hr
8-hr turnover: 62 gpm
Dig, rough: 222 cu yd

Start from

Length20Width40

Shape

Shallow3.5ftDeep6.5ftDeck6ft

Lot length56ftLot width72ft

Shell

With the pool

Cover

Heat

A first heater size for a 15°F rise is about 145,000 BTU.

What it might cost

Gunite shell, in the ground$132k–$208k
Concrete deck and coping$20.8k–$34.6k
Safety cover$3,800–$7,200
Heat pump$5,000–$9,500
Salt system$1,600–$2,800
LED lights$2,200–$4,800

Range$165,350–$266,850

Opening shock, about 4.5 lb of 65% cal-hypo. US planning ranges, not a bid.

How the numbers are figured

Gallons use the waterline times the average of the shallow and deep ends, times 7.48052. A spa adds a 3.5 ft bowl and keeps about 82% of its circle, because it overlaps the pool.

The shell price is dollars per square foot of water, in the ground, before deck and options. Deck and coping are $24–$40 per square foot. Soil, access, and permits are not in the range.

Fill time assumes a 9 gallon-per-minute hose. Salt is the weight to reach 3,200 ppm. The heater figure is waterline × 12 × a 15°F rise, rounded to the nearest 5,000 BTU.