Heat Network Zoning Moves Into Local Delivery

Plymouth consultation signals next phase for heat network zoning in England

Plymouth City Council has opened a six week consultation on proposed heat network zone boundaries. This marks a practical step in England’s move towards locally designated low carbon heat networks.

The consultation, which runs from 8 June to 19 July 2026, covers two proposed zones in Plymouth: the City Centre and Waterfront, and Derriford. The council says national zoning modelling has identified the indicative boundaries, drawing on data such as building type, size and energy use to assess where heat networks could offer access to lower cost, lower carbon heat. Further detail is available through Plymouth City Council’s boundary consultation.

For developers, building owners, estate managers and public sector bodies, the consultation is worth watching closely. Heat network zoning is no longer just a national policy concept. It is beginning to shape local infrastructure planning, future connection expectations and the way major buildings may approach heat decarbonisation.

What is changing?

Heat networks, or district heating, distribute heat from a central source through insulated pipes to serve multiple buildings. Government policy is to use zoning to identify areas where it expects heat networks to offer the lowest cost and carbon option for heating.

The Department for Energy Security and Net Zero has said heat network zoning will “fundamentally transform” the development of heat networks in towns and cities across England. Under the developing framework, local zone coordination bodies will consult on proposed boundaries. They will then refine them using local evidence and then formally designate heat network zones.

The government has also confirmed that it expects at least 10 of the largest English towns and cities to establish zones soon after the heat network zoning regulations go live, with further zones to follow.

Why Plymouth matters

Plymouth’s consultation is significant because it shows what zoning looks like at street and estate level. The council is asking for feedback from building owners, statutory bodies, transport bodies, utility operators, existing heat network operators, and people who live or work near the proposed zones.

The practical success of heat networks depends on local detail: heat demand, development pipelines, existing infrastructure, highways constraints, anchor loads, potential heat sources and the timing of future construction.

Consultation feedback may change the boundaries before the relevant bodies confirm and formally designate the zones. For organisations with property interests in or near the proposed areas, this is a chance to understand whether future projects may need to allow for heat network connection, heat network ready design, or changes to long term plant replacement strategies.

Implications for projects and estates

Heat network zoning could affect built environment decisions in several ways.

For new developments, the government has previously proposed that buildings receiving planning permission after a zone is designated may be required to connect when complete, or include design measures for future connection where the network is not yet available.

For existing larger buildings, zoning may become an important factor in asset management, decarbonisation planning and capital works sequencing. Building owners may need to test decisions on boiler replacement, heat pumps, plant room space, metering, pipe routes and landlord energy strategy may need to be tested against emerging local heat network plans.

For local authorities and public estate owners, zoning may also create opportunities to use civic buildings, hospitals, universities, leisure centres and other large heat loads as anchors for wider low carbon heat infrastructure.

Regulation is also tightening

The zoning agenda is developing alongside wider heat network regulation. Ofgem has confirmed that heat network authorisation conditions came into effect on 27 January 2026, following the Heat Networks Market Framework regulations. These obligations apply to authorised persons carrying out regulated heat network activity and form part of the move to give heat network customers protections more comparable to those in other regulated energy markets.

This is important for confidence. As heat networks expand, clients will need to consider not only technical feasibility and carbon performance, but also governance, consumer protection, billing, resilience and long term operational responsibility.

What should clients do now?

Plymouth’s consultation is local, but the direction of travel is national. Building owners and project teams should start checking whether assets sit within current or emerging heat network opportunity areas, particularly in dense urban locations.

For live and planned projects, it may be sensible to review plant strategy, spatial allowances, energy statements, planning assumptions and future connection options before teams lock in key design decisions. The most exposed projects are likely to be larger buildings, mixed use schemes, public estate assets and developments in town and city centres where heat demand is concentrated.

The immediate takeaway is simple: heat network zoning is moving from policy into implementation. Organisations that engage early will be better placed to manage cost, programme and compliance risk, while identifying opportunities to support lower carbon heat at neighbourhood scale.