Commercial heat pumps in London: costs, grants and local rules
What is specific to replacing a gas or oil boiler with a heat pump in a London business premises: heat networks and zoning, planning and noise, the electricity network and funding.
Start with the map: is a heat network nearby?
Before specifying a building-level heat pump, check whether a district heat network already passes your street or is planned for it. The Greater London Authority (GLA) publishes the London Heat Map, which shows existing and proposed district heating systems, heat load data for public-sector buildings and network opportunities. The GLA says the information on existing and proposed networks is supplied by network operators, so treat it as a starting point and confirm directly with the operator.
If a network is nearby, the question for you is whether connecting is cheaper, simpler or lower-carbon than plant of your own. If it is not, a stand-alone air-source or hybrid system is the usual alternative. The air-source guide and the hybrid retrofit guide cover those routes.
Heat network zoning is being piloted in London
Under the Energy Act 2023, England is moving to heat network zoning: areas where heat networks are the expected low-carbon solution and where buildings may eventually be required to connect. Government has been testing the approach through a zoning pilot programme with local authorities, and in October 2024 it announced six areas of England to receive funding to progress the first zones. Two of them are in London: the Old Oak and Park Royal Development Corporation (OPDC) area and the South Westminster Area Network (SWAN).
The GLA states that in London the zone coordination role would sit with the GLA and the London boroughs. The London boroughs of Barking and Dagenham and of Southwark also took part in the pilot. A London Assembly investigation adopted in October 2025 examines how the GLA can support zones, and records the Mayor’s aim for zones with mandated connection for existing and new domestic and non-domestic buildings. We have not verified which streets or sites would be covered, or when any connection requirement would apply; if your premises are in or near one of these areas, ask the borough or the GLA what is proposed before committing to a heating decision with a long life.
If you are a building owner looking at shared heat sources, the heat networks and ambient loops guide explains how low-temperature loops with building-level heat pumps differ from conventional high-temperature district heating.
London Plan policy that touches a heating project
The London Plan (2021) is the spatial development plan that boroughs apply alongside their own local plans. Two policies matter for a heating decision.
- Policy SI3, energy infrastructure. It sets out Heat Network Priority Areas, described as the places most suitable for developing or expanding heat networks. For major development in those areas it sets a hierarchy for the heat source: connect to a local existing or planned heat network first, then use zero-emission or local secondary heat sources with a heat pump if required, before combined heat and power or gas boilers. The policy is aimed at major development, so a boiler replacement in an existing building is not automatically caught, but the priority-area map shows where the borough expects networks.
- Policy D14, noise. It requires development proposals to manage noise, avoiding significant adverse impacts on health and quality of life, and works with the Agent of Change principle in Policy D13. For a rooftop or yard heat pump in a dense mixed-use street, that is the policy lens through which neighbouring flats, hotels or studios may be considered.
Whether your project needs planning permission, and what noise evidence the borough wants, is decided case by case. The permitted-development rights for air-source heat pumps in England cover dwellinghouses and blocks of flats, not commercial premises, and a noise assessment to BS 4142 is commonly requested. See commercial heat pump noise and planning for the general position.
Boroughs, listed buildings and leases
Each London borough, and the City of London, has its own planning department and its own view of what counts as acceptable plant noise and appearance. Conservation areas and listed buildings add further control, and these are common in central London. Many London businesses also occupy leased space, where the landlord’s consent to roof, riser or plant-room use is a gate before any planning question. Raise both early, and ask the borough whether pre-application advice is available and what it costs.
The electricity network
Electricity in Greater London is distributed by UK Power Networks (London, Eastern or South Eastern licence area depending on the borough); the other UKPN areas cover the South East and East of England. A heat pump adds electrical demand, so ask UKPN, directly or through your installer, whether your existing supply can carry it or whether a connection upgrade is needed. One third-party guide describes London’s network as capacity-constrained, which is an opinion we have not verified, but it is a reason to start the conversation early. Do not assume a timescale; ask in writing.
Funding: short version
The Boiler Upgrade Scheme covers England and Wales and can apply to a building used for a business, but only where the heat pump is 45 kW thermal or less for a single heat pump (70 kW thermal for a multi-unit system). The Public Sector Decarbonisation Scheme and the Industrial Energy Transformation Fund are closed. Check the grants and funding guide for the current position and for tax relief, and see heat pump costs for published price bands. The GLA’s Zero Carbon Accelerator gives free technical support, not capital, to London public-sector bodies, and the GLA said it would run until June 2026. The Mayor’s Green Finance Fund lends to public bodies, colleges and museums, not private businesses. Check the GLA site for anything open to private businesses rather than assuming eligibility.