Air Source Heat Pump Installation in St Austell

Why St Austell is One of Cornwall's Best Heat Pump Markets

St Austell's china clay heritage left a town built largely without gas connections. Areas like Mount Charles, Poltair, Bethel, and the coastal fringe at Charlestown and Carlyon Bay heat predominantly with oil or electric storage — making them ideal for the £7,500 Boiler Upgrade Scheme grant when switching to an air source heat pump. With 45% of St Austell homes off the mains gas grid, the addressable market here is substantial.

Property Types & Suitability

• Victorian & Edwardian granite terraces (Mount Charles, Poltair, Bethel): Solid stone construction, typically 70–90m². Often need 2–4 radiator upgrades but well-suited to 9–11kW heat pumps. See our radiator guide.
• 1930s–50s semis & bungalows (Carclaze, Trenance): Good loft insulation potential, ideal for 8–10kW units. Cavity walls can be filled if not already done.
• Premium coastal properties (Charlestown, Carlyon Bay, Duporth): High-specification Daikin Altherma and Mitsubishi Ecodan systems, often paired with smart hot water cylinders. Average property value in Carlyon Bay: £690,000.
• New-build estates (Higher Trewhiddle, Retallick Meadows, Edgcumbe Green): Cornwall Council's 2023 Climate Emergency Development Plan Document requires heat pumps in all new builds — these properties are already equipped.

The Eden Project Effect

Eden Geothermal is actively drilling just 3 miles north of St Austell town centre to develop the UK's first commercial deep geothermal energy project. The project is a powerful local endorsement of heat technology and has increased awareness of renewable heating across the town significantly. Cornwall already ranks first nationally for domestic solar and heat pump adoption.

Costs After the £7,500 BUS Grant

Typical heat pump installation costs in St Austell after deducting the £7,500 Boiler Upgrade Scheme grant: £4,500–£6,500 for a Victorian terrace; £5,500–£7,500 for a semi-detached; £6,000–£9,000 for a larger detached property. We handle the grant application end-to-end — you simply deduct it from your invoice. See our full St Austell heat pump guide for detailed local costs.