Ground source heating for a house – price, installation and savings 2026

A ground source heating system for a detached house typically costs €15,000–28,000 turnkey installed in 2026; for a 150 m² house usually €18,000–25,000. Competition has brought prices down markedly from the peak years. In return, the need for purchased electricity falls by about 70–80 per cent compared with direct electric heating, because the heat is drawn from energy stored in the bedrock.

What makes up the price of ground source heating?

• Ground source heat pump: €5,000–12,000
• Drilling the energy well: €4,500–15,000 (€30–50/metre; a typical well is 150–200 m)
• Installation and connections: €3,000–6,000
• Electrical work: €1,000–3,000

A large house may need two wells, about 300 metres in total. The alternative is a horizontal ground loop in the topsoil, which needs a large open area – most installations use a borehole. The system is long-lived: a borehole lasts about 50 years, the pump 15–25. Well depth is sized to the house's energy demand; an undersized well cools over the years and eats into efficiency, so insist on a sizing calculation in the quote.

How much does ground source heating save?

A ground source heat pump's COP is typically 3–4: one purchased kilowatt-hour yields 3–4 kilowatt-hours of heat. With direct electric heating, a 150 m² house uses about 15,000 kWh a year – with ground source heating, purchased electricity falls to 3,000–5,000 kWh.

An example from Tampere: in a 178 m² house the investment was about €20,000, and electricity consumption fell from 22,000 kWh to 4,630 – a saving of about €2,950 a year and a payback of 7–8 years. Switching from oil typically saves €2,500–4,000 a year, payback 5–10 years. Use an all-in electricity price of 12–15 cents/kWh; 2022–2023 crisis prices overstate the benefit.

Winter spot peaks make their own case: when the spot price rose to 15–17 cents/kWh in January–February 2026, a ground-source house bought its heat on a third of direct electric heating's consumption, since efficiency does not drop in freezing weather.

Does ground source heating need a permit?

From 2025, Finland's Building Act merged the old building and action permits into a single building permit (rakentamislupa). Drilling an energy well still requires a permit or notification to municipal building control, and practice varies – check your municipality's guidance before drilling. In new construction, ground source is handled within the house's building permit. The permit fee is typically €200–800.

Is there any support for ground source heating in 2026?

Not for new builds: the household expenses tax credit (kotitalousvähennys) covers only maintenance and improvement work on an existing home, so it applies to a heating refit. Currently you get 35% of the labour cost, up to €1,600 per person, with a €150 excess. The government has proposed raising this to 40% and €2,100, retroactively from the start of 2026. As of July 2026 the proposal had not yet been confirmed – check the current position at vero.fi before your refit. For those giving up oil heating there is an enhanced credit: 60% of labour, up to €3,500 per person, until the end of 2027. The ELY centre's oil-heating replacement grant, by contrast, closed to applications on 25 May 2026.

Does ground source heating suit a log house and a hall?

It does, and particularly well where heat demand is high: a large detached house or a continuously heated hall, because ground source output does not depend on the outdoor temperature. Water-based underfloor heating is its natural partner and leaves a log house's walls free of radiators – and the concrete slab doubles as a heat store that can be charged on spot-price electricity during the cheapest hours. In large properties the price class is different: ground source systems for housing companies and commercial buildings start at about €50,000, and the biggest projects cost as much as €300,000.

How common is ground source heating?

Ground source heating is proven technology: it is the main heating method in about 15 per cent of Finland's detached houses and the most popular choice among new-build owners. In 2025 a total of 112,000 heat pumps were sold in Finland, of which about 7,000 were ground source units, and heat pumps already provide almost 30 per cent of buildings' heating. Ground source heating also lifts a home's resale value.

Checklist for anyone considering ground source heating

• Get 2–3 quotes and insist on a sizing calculation in each.
• Make sure the price includes drilling, installation, connections and electrical work.
• Check the municipality's permit practice with building control before drilling.
• Calculate the payback at an electricity price of 12–15 cents/kWh.
• Renovators: use the household tax credit on the labour share and watch for the increase to be confirmed.

• Turnkey price 2026: €15,000–28,000; for a 150 m² house usually €18,000–25,000.
• Drilling costs €30–50/metre; a typical energy well is 150–200 metres deep.
• COP 3–4: the need for purchased electricity falls by about 70–80% versus direct electric heating.
• Payback when switching from direct electric heating is typically 7–12 years, from oil 5–10 years.
• An energy well needs a municipal permit (Building Act 751/2023); in a new build it is handled with the house's building permit.
• The household tax credit applies to refits only: now 35%/€1,600, with a rise to 40% and €2,100 pending retroactively from the start of 2026.