Heating a Home Off the Gas Grid

Four million UK households, about 15 per cent of the total, have no mains gas connection¹. They heat with heating oil, liquefied petroleum gas (LPG), solid fuels, mains electricity and microgeneration, and the choice between those fuels decides both the running cost and how much of the household's heating depends on somebody else¹.

The short answer is that off gas grid heating is a choice between a fuel you store and a fuel you buy as it arrives. Oil and LPG need a tank, a delivery and a boiler. Electricity needs no tank and no delivery, but it comes through the grid from a supplier. A heat pump or a biomass boiler changes the fuel again, and each option carries a different kind of dependence: on a tanker, on a supplier, on a manufacturer, or on the weather.

What off gas grid heating actually means

Most heating in the UK is supplied by gas, and the homes outside that system are a minority with a different set of problems⁶. The fuels available are heating oil, LPG, solid fuels, mains electricity and microgeneration, and each one has its own supply chain, storage requirement and regulatory position¹.

Heating oil is the classic rural fuel: an alternative fuel used to heat homes and buildings that are not connected to the gas grid⁷. It arrives by tanker, sits in a tank on the property, and feeds a boiler. LPG works the same way with a different fuel and a different storage vessel. Solid fuel is bought by the bag or the tonne and burned in a stove or boiler. Electricity is already connected to almost every home, so an electric boiler, storage heaters, panel heaters or a heat pump need no new fuel supply at all.

The shape of the housing stock explains why oil dominates where it does. Detached homes and bungalows account for 60 per cent of all homes with oil heating in England, 52 per cent in Wales and 71 per cent in Scotland, compared with 31 per cent of all homes in Britain⁷. Off gas grid homes are disproportionately large, detached and rural, which is exactly the profile that makes a tank and a delivery viable.

The figures that decide the choice

The headline numbers are the count of homes, the support available, and the dates that govern what can be installed. Four million UK households, 15 per cent, are off the mains gas grid¹. In Scotland, over 450,000 homes do not use gas as their primary heating fuel². Around 9 per cent of Scottish dwellings that are on the gas grid use an alternative fuel, such as electricity, as their main heating fuel, which shows that a gas connection does not guarantee gas heating⁸.

Support has come in two forms with two different figures. The Domestic Alternative Fuel Payment was legislated in October 2022 as a one-off £100 support payment for UK households using alternative fuels for heating¹⁰. The Alternative Fuel Payment delivered from February 2023 was a one-off £200 credit on energy bills per household using alternatives to mains gas for heating, such as heating oil, LPG or coal³. The two documents give different amounts, and the £200 figure is the one attached to the payment actually made from February 2023.

What drives the cost and the choice

Three things drive the decision: what fuel can physically reach the property, what the fuel costs to buy and store, and what the building loses through its fabric. The first is a matter of geography and access. The second is a matter of market prices and delivery arrangements. The third is the one the household controls.

The fabric point is the one official guidance keeps returning to. The Home Upgrade Grant Phase 2 funds local authorities to improve the energy performance and heating systems of off gas grid homes in England, which is a recognition that the cheapest unit of heat is the one the building does not lose¹¹. The same logic sits behind the Scottish proposal that all buildings should be energy efficient by 2035 and that homes should meet a minimum standard broadly equivalent to EPC C where technically feasible and cost effective¹².

For heat pumps specifically, the official modelling is favourable on running demand. The air source heat pump consistently resulted in the lowest delivered energy demand across the archetypes modelled, and had the lowest capital cost for the houses, though that relationship was not observed for the block of flats, where the air source heat pump was the highest for the business as usual specification¹³. That is a modelled result, not a promise about any individual home.

Oil, LPG and solid fuel: stored fuels

Stored fuels give a household a buffer. A full tank is heat that does not depend on the grid, the weather or a supplier's dispatch system that day. That is the independence argument for oil and LPG, and it is real. It is also bounded, because the tank has to be filled by somebody, and the boiler that burns the fuel has to be serviced and eventually replaced.

The housing profile behind oil heating is distinctive. Detached homes and bungalows account for 60 per cent of all homes with oil heating in England, 52 per cent in Wales and 71 per cent in Scotland, compared with 31 per cent of all homes in Britain⁷. Those are homes with space for a tank and, usually, no realistic prospect of a mains gas connection being laid to them.

The regulatory direction of travel is against new fossil fuel installations in this group. The UK Government consulted on ending the installation of high-carbon fossil fuels to heat homes that are not connected to the gas grid in England from 2026, and non-domestic buildings not connected to the gas grid from 2024¹⁴. That date was then delayed. The phase out date for installing new oil and LPG boilers and new coal heating for off grid homes was put back to 2035⁴. The delay was set out as a delay from 2026 to 2035 for England¹⁵.

Electric heating and heat pumps

Electric heating needs no tank, no delivery and no flue. That is its independence advantage: the fuel arrives through a connection almost every home already has. Its disadvantage is that the household is buying from a supplier through the grid, so the dependence moves rather than disappears.

An air-to-water heat pump transfers heat drawn from surrounding air to water in a wet central heating system, which means it can use the radiators and pipework an oil or LPG boiler already feeds¹⁶. That matters for off gas grid homes, because it means the distribution system does not have to be replaced, only the heat source.

The planning position is permissive in most cases. Air source heat pumps fall under permitted development rights, provided the installation complies with the Microgeneration Certification Scheme Planning Standards (MCS 020a)⁵. The volume of the outdoor compressor unit, including housing, must not exceed 1.5 cubic metres on a house or 0.6 cubic metres on a block of flats⁵. All parts must be at least one metre from the property boundary¹⁷. Only the first installation is permitted development on a house which is not detached or a block of flats, while for detached houses the first two air source heat pumps are considered permitted development⁵. Installations on pitched roofs are not permitted development, and on a flat roof all parts must be at least one metre from the external edge of that roof⁵.

There are exclusions. Permitted development rights do not apply for installations within the curtilage of a Listed Building or within a site designated as a Scheduled Monument⁵. On land within a Conservation Area or World Heritage Site the heat pump must not be installed on a wall or roof which fronts a highway, or be nearer to any highway which bounds the property than any part of the building⁵. Noise is a condition: levels for an air source heat pump on its own must stay at or below 42 decibels from a metre away from any habitable room, and if that is exceeded planning permission approval is needed¹⁷. Where permission is required, noise must not exceed 37 dB LAeq at any time, measured on the boundary of the site with any neighbouring residential property¹⁸.

How the rules differ across the UK nations

The four nations have diverged, and the differences matter for what can be installed and when.

In England, the Future Homes Standard direction is that new UK homes will be built without fossil fuel heating from 2025¹⁹. For existing off gas grid homes, the proposed phase out of new oil and LPG boilers and new coal heating sits at 2035⁴. Building control has some flexibility: a building control body might declare it is reasonable to install a higher carbon heating system, but the building must still meet the CO2, primary energy and fabric energy efficiency requirements²⁰.

In Scotland, the New Build Heat Standard applies to new buildings applying for a building warrant in Scotland which are not served by a heat network, and they must meet their space and water heating demand from a zero emissions source²¹. From 2023, only renewable and low or zero emissions heat networks will be consented²². From early 2024, the legislative framework requires that new heat networks, and extensions of existing networks, are powered using low and zero emissions heat sources²¹. Heat networks must also have a scheme in place to transfer operational rights to a third party to ensure sustained supply²². The proposed backstop date for low or zero emissions heating in existing buildings is 2045¹².

In Northern Ireland, the Building Regulations Phase 3 proposals set out options. Under Option 1, heat pumps or alternative solutions, potentially biofuel, would be required in areas without access to mains gas, and a significant increase in the uptake of heat pumps is likely under both Options 1 and 2 in new homes off the gas grid if oil heating is no longer viable²³.

What the rules require of installations

Beyond the phase out dates, three sets of rules bear on an off gas grid heating installation: planning, building regulations and, for heat networks, consumer protection.

Planning is the most visible. The permitted development conditions for air source heat pumps are set out above, and they apply to the installation, alteration or replacement of an air source heat pump on a house or block of flats, or within the curtilage, including on a building within that curtilage⁵. Development is permitted only if there is no existing wind turbine on a building or within the curtilage of that property, and additional wind turbines or air source heat pumps at the same property require an application for planning permission⁵. The unit must not be used solely for cooling purposes, must be sited so far as is practicable to minimise its effect on the external appearance of the building and its effect on the amenity of the area, and must be removed as soon as reasonably practicable when it is no longer needed for microgeneration⁵.

Building regulations apply in parallel. Building Regulations parts A to T apply to an air source heat pump, plus Regulation 7¹⁷. For new developments without access to the national grid, Regulation 26 gives building control some room to accept a higher carbon heating system, provided the CO2, primary energy and fabric energy efficiency requirements are still met²⁰.

Heat networks, which serve some off gas grid blocks, now have their own regime. As of January 2026, a new heat network regulatory regime has been introduced, including designating Ofgem as the sector regulator¹⁰. The authorisation condition on back billing applies across Great Britain, limiting back billing to 12 months across all heat networks unless there are conflicts with existing housing legislation²⁴. Approximately 14,000 blocks of flats in the UK were served by communal heating as of 2023⁶.

What it means for a household's energy independence

Off gas grid heating is a study in partial independence. A stored fuel gives a household a physical reserve and a choice of supplier, but it depends on a delivery chain, a tank and an appliance with a proposed end date. Electricity gives a household a fuel that arrives without a delivery, but the dependence moves to the grid and to a supplier. A heat pump reduces the amount of delivered energy the home needs, which is the closest thing to independence the evidence supports, but it still runs on electricity and still needs a manufacturer's parts and, often, an app or a controller.

The advice landscape reflects this. The NI Energy Advice service funds independent advice on solar panels, heat pumps and other energy efficiency measures, and directs homeowners to seek that advice from organisations that are not selling the equipment²⁵. That is the structural point: in a market where the household is choosing between fuels with different supply chains, independent advice is the mechanism that keeps the choice informed.

Microgeneration changes the picture at the margin. A micro hydro plant can supply space and water heating when available power exceeds demand, which is a genuine form of self-supply where the resource exists²⁶. Hybrid heat pumps offer a middle path: there were three packaged solutions but a large number of add-on hybrid heat pumps on the market as of 2016²⁷. The Climate Change Committee has called for secure UK Government funding for low carbon sources of heating beyond 2021, which is a recognition that the transition depends on policy as much as on equipment²⁸.

The honest summary is that no off gas grid option delivers full independence. Oil and LPG store energy but depend on delivery. Electricity depends on the grid and a supplier. Heat pumps reduce demand but depend on electricity, a manufacturer and often a connected controller. What a household can control is the fabric of the building, which reduces the size of every one of those dependencies at once.