Heat network zoning for landlords and leaseholders

If you own or manage a block of flats, a multi-let office or a mixed-use building with a central boiler, heat network zoning has a particular twist for you. Your building may fall inside the requirement to connect, and the people who use the heat are often not the people who own the plant. This guide covers what zoning could mean for freeholders, landlords, managing agents, and the leaseholders and tenants in those buildings. It also covers the Ofgem rules that already apply to communal heating, which matter more in the short term than zoning does.

Start with the honest position.

So nothing in this guide is a duty you have today under zoning law. It is a guide to what's coming and what to get ready.

Why communal heating buildings are covered

The government set out its zoning policy in its response to consultation, published 21 January 2026[source]. It proposes three kinds of building that could be required to connect to the district heating network inside a designated zone. One of them is existing buildings with communal heating, both domestic and non-domestic[source].

The logic is mostly about pipes. A building with communal heating already moves hot water from one plant room to every flat or unit. Connecting it to a heat network means swapping the boiler for a heat exchanger in that plant room, without going into each home to rip out individual boilers. For a zone developer, a block of 200 flats on one connection is far more attractive than 200 separate ones.

In practice the communal category could take in purpose-built blocks of flats, sheltered and supported housing, student accommodation and build-to-rent schemes with a central boiler, as well as multi-let offices, shopping centres and mixed-use buildings with shared plant. By contrast, existing individually heated homes are not required to connect[source]. A block where every flat has its own gas boiler is unlikely to sit in the communal category, although the regulations will confirm exactly where the lines fall.

A multi-let commercial building could also meet the separate test for existing non-domestic buildings with a wet heating system and average heat demand above 100 MWh a year[source]. Our 100 MWh guide explains how to work out your figure. How much detail the regulations add on smaller communal systems is one of the things to watch for when they're published.

Who is likely to be treated as the building owner

In a single-owner office, it's obvious who would receive a heat network connection notice. In a let building it often isn't. There may be a freeholder, a head lessee, a resident management company or right-to-manage company, a managing agent and dozens of leaseholders, each with different rights over the plant room.

The regulations will decide who counts as the responsible person for zoning purposes. Until they are published, anyone who tells you for certain is guessing. A reasonable working assumption is that the duty will sit with whoever owns and controls the communal heating plant, which in many blocks is the freeholder or a management company. But don't build plans on that assumption alone. If your structure is unusual, for example a head lease, a right-to-manage company, or commercial units owned separately from the flats above, take legal advice once the regulations are out.

What you can do now is draw up a simple map for each building: who owns the plant, who maintains it, who has the repairing obligation under the leases, who buys the fuel and who bills residents or tenants for heat. You'll need that map whatever the regulations end up saying, and it's also the starting point for the Ofgem questions later in this guide.

Leases, service charges and consents

For a let building, three practical questions sit behind any connection. Can the landlord carry out the works? Can the cost be recovered? Who has to agree?

Connection usually means a heat interface unit or substation in the plant room, a new pipe route into the building and sometimes changes to the pipework inside. Most of that is in common parts the landlord controls, but some routes may cross demised areas or need access to flats and units.

Recovering the cost is where leases matter most. Many leases let a landlord recover the cost of repairing or replacing heating plant through the service charge, but are silent on swapping the boiler for an external heat supply, or treat that kind of change as an improvement that can't be recharged. Older leases written around an on-site boiler house rarely anticipate buying heat from a third party under a long-term contract.

Here's a hypothetical to show why this matters. Say connection works cost £80,000 and the lease splits service charge costs equally between 40 flats. If the cost is recoverable, each leaseholder's share is £2,000. If it isn't, the landlord carries the whole £80,000. The figure is made up and real costs vary widely, but the split is the point: the wording of your lease decides who pays.

Residential leaseholders also have statutory protections over service charges, including consultation before major works and before some long-term contracts. A multi-year heat supply agreement could well engage those rules. Take legal advice before signing anything, and build the consultation time into your plans.

Commercial tenants and fit-outs

Multi-let offices and retail buildings add another layer. Tenants often have their own fit-out kit, such as fan coil units or air handling units fed by the landlord's heating system, and sometimes their own plant.

Before any connection, work out who owns the equipment downstream of the plant room, whether tenants' kit will work at the temperatures the heat network supplies, and whether works inside a tenant's demise need their consent. Heat networks can run at lower temperatures than older boiler systems, so a tenant's system sized for very hot water may need adjusting. Check how alterations, reinstatement and dilapidations clauses would apply to any changes.

Timing helps here. The proposed connection window is at least 12 months long[source], which gives you room to plan works around lease events, fit-outs and quiet periods. Tenants also hold some of the data you need. If your leases include data-sharing clauses for energy use, now is a good time to use them.

Lease terms as an exemption ground

The government's list of proposed exemption grounds includes legal or contractual requirements that prevent connection, such as restrictive covenants or lease terms[source]. That's directly relevant to landlords, but read the wording carefully. The test is about requirements that prevent connection, not ones that make it inconvenient or expensive. A lease that makes cost recovery awkward is not the same as a lease that legally stops the works.

Expect the zone coordination body to ask for evidence, such as the relevant clauses and a legal view on why they block connection. Temporary exemptions can last up to 2 years from the end of the proposed connection window[source], and leases change at renewal, so don't assume a lease-based heat network zoning exemption would last for ever. Trying to manufacture a barrier is a poor strategy, especially given proposed penalties of up to £1 million or 10% of annual turnover, whichever is higher[source].

Our guide to exemptions and deferrals covers all the grounds, including existing low-carbon heating and building safety works, which also come up often in residential blocks.

What tenants and leaseholders should know

If you live or work in a building with communal heating, your interests are mostly about cost, reliability, disruption and who to turn to when something goes wrong.

Ask your landlord or managing agent early whether the building is in an area where zoning work is under way. Our zone checker shows how far things have got locally. If a connection is proposed, ask to see the proposed heat charges and standing charges, how long the supply agreement runs, and how the works will be phased. Residential leaseholders should look out for statutory consultation notices and respond to them.

Heat network customers already have some protection. Since 1 April 2025[source], the consumer advocate has been Citizens Advice, for heat network consumers in England and Wales[source]. The Energy Ombudsman accepts heat network disputes, usually after 8 weeks with the supplier[source]. Commercial tenants generally rely more on their lease than on consumer rules, so their bargaining power is in the lease and in negotiation with the landlord.

If you already run a communal system

This is the part with a real deadline. Many landlords don't think of themselves as heat network operators, but a central boiler supplying several flats or units, with residents or tenants paying for that heat, is very likely to count as a heat network for regulatory purposes. Check Ofgem's guidance rather than assume you're out of scope.

Ofgem became the regulator for heat networks on 27 January 2026[source], with authorisation conditions applying from that date.

At the time of writing that deadline is less than three months away. If your managing agent runs the system, ask them in writing who is handling registration.

The metering and billing rules changed on the same day, removing some older requirements.

Don't read that as "metering no longer matters". Clear, accurate bills are central to good relations with residents and to the Ofgem regime, and a metering specialist can tell you what still applies to your building. Our guide to Ofgem regulation and HNTAS goes into more detail.

Getting the right help

Most landlords will need two kinds of help, possibly from different people. For leases, service charges and consultation, you need a property lawyer or a legal and commercial adviser. For the Ofgem side, look for Ofgem authorisation specialists and metering and billing advisers. Our guide to choosing a consultant explains how to scope the work and compare quotes.

Nothing in this guide is legal advice. Lease wording varies a great deal, and the zoning regulations will settle questions we can only flag today.