Pool types and budget tiers
Endless pool / swim spa (3m × 2.4m, current generator for stationary swimming): £18,000–£45,000 installed inc. base, plumbing, electric. 5–10 year lifespan; smaller footprint suits side return or compact garden. Liner pool (8m × 4m steel or polymer panel structure with replaceable PVC liner): £55,000–£85,000 inc. excavation, panel structure, liner, plant room. Liner replacement every 10–15 years £6,500–£14,500. Concrete pool (steel-reinforced gunite/shotcrete shell, tile or plaster finish, 8m × 4m): £85,000–£140,000 standard spec; £140,000–£180,000 with infinity edge, automatic cover, lighting, heating, smart control. Lifespan 30–50+ years with periodic re-tiling/re-plastering. Fibreglass pool (preformed shell): £45,000–£75,000 — fastest install (8 days vs 16 weeks for concrete) but limited size and shape options. Basement / indoor pool (excavation, structural slab, mechanical ventilation, dehumidification, glazed enclosure): £180,000–£450,000+.
Planning, building regs and consents
Planning permission required for: pools larger than certain coverage of garden area; pools requiring excavation in front gardens; conservation areas; listed buildings; pools requiring above-ground structure. Most rear-garden pools at standard sizes (under 50% of garden footprint, not adjacent to boundary) are permitted development — confirm with borough. Pre-application advice £450–£950 strongly recommended before committing. Building Regulations apply to: structural slab and walls (engineer-designed); electrical (Part P certified, RCD-protected); plumbing/gas (heating system, water supply); ventilation in pool houses; structural alterations to existing buildings (basement conversions). Party Wall Act: pools within 3m of neighbour foundation or 6m of party wall trigger notice. Insurance: increased home insurance premium £150–£450/year. Safety: pool covers and fencing legally required to prevent child drowning; CE-marked automatic safety cover £4,500–£12,000 or perimeter fence 1.2m high £2,800–£6,500.
Heating, water treatment and plant room
Heating: air-source heat pump dedicated to pool £4,500–£8,500 install + £450–£950/year running cost (heating from May–September typical); gas boiler pool heating £2,800–£5,500 install but higher running cost £950–£1,800/year. Heat pump strongly preferred for new builds 2026. Water treatment: chlorine dosing system £1,800–£3,800; salt-chlorine generator (preferred — softer on skin and eyes) £2,800–£5,500; UV sterilisation £1,800–£3,800. Filtration: sand filter + circulation pump £1,200–£2,800; cartridge filter £950–£1,800. Plant room: dedicated outbuilding or insulated cabinet 3–6m² housing all mechanical, electrical, dosing equipment £6,500–£14,500 including build. Pool cover: manual rolled cover £450–£950; automatic submerged cover £4,500–£12,000 (significant heating cost saving, safety compliance, debris exclusion). Smart controls (Hayward Omnilogic, Pentair IntelliCenter) £950–£2,800 integrating heating, filtration, dosing, lighting via app.
Running costs and lifespan
Annual running cost: heating £450–£950 (heat pump) or £950–£1,800 (gas); pump and filtration electricity £450–£950; chemical treatment £180–£420; cover and water replacement £85–£180; service contract £450–£950 (recommended). Total £2,500–£6,500/year all-in. Increased water bill: London Thames Water at metered supply £4–£8/m³; typical pool refill 32–48m³ + monthly top-up; annual £180–£480 water cost. Lifespan: concrete pool shell 30–50 years; tile finish 15–25 years (re-tile cost £15,000–£35,000); liner pool 10–15 years (re-line £6,500–£14,500); fibreglass pool 20–30 years; equipment (pumps, heaters) 8–15 years. Maintenance: weekly self-service or pool company £180–£480/month full service; annual deep clean and service £450–£950. Resale: pools add value in £1.5M+ homes (typical buyer demographic); below £950k pools can be a negative (maintenance burden); above £1.2M they're often expected on larger plots.
