How to choose the best heat network consultant (and what they should cost)

If your building might end up in a heat network zone, sooner or later you'll wonder whether you need outside help. Probably you will at some point, but not necessarily yet, and not necessarily the kind of help the first firm you speak to happens to sell. This guide explains what heat network consultants actually do, how to pick one, what to watch out for, and how to make sure you're paying a fair price for a defined piece of work.

First, the context that should shape every conversation you have with an adviser.

No zone exists in law yet, so no building has a legal duty to connect today. That doesn't make advice pointless. It means the right advice now is about preparation and decisions, not emergency compliance.

The types of help available

"Heat network consultant" covers several quite different jobs. Most firms do some of them well and others less so. Here are the main types, with a link to the matching filter in our directory.

Feasibility and heat demand. Working out how much heat your building really uses, what your options are and how they compare. The single most important number is whether you fall above the proposed threshold of 100 MWh a year[source], because the policy would cover existing non-domestic buildings with a wet heating system and average heat demand above 100 MWh a year[source]. A good feasibility adviser will base this on your metered data, not a generic benchmark. Find feasibility consultants.

Zoning compliance and exemptions. Helping you understand whether you're likely to be covered, responding to a heat network connection notice, and preparing an exemption case where one is justified. For example, one proposed ground is existing low-carbon heating with an expected lifespan of more than 2 years[source]. Find zoning compliance consultants.

Connection negotiation. Once a notice arrives, you'd have at least 6 months from receiving the notice[source] to agree a connection date with the zone developer or apply for a temporary exemption. Zone developers are appointed through competition, with exclusive rights to develop a heat network in the zone delivery area[source], so you can't shop around for a different network. A negotiation adviser helps you test the developer's charges, technical terms and timetable. Find connection negotiation consultants.

Technical design. Engineers who design the changes inside your building: the substation or heat interface unit, the plant room layout, and any work to your heating system so it runs well at district heating temperatures. Find design and engineering firms.

Legal and commercial. Lawyers and commercial advisers who review heat supply agreements, lease implications and disputes. If you're a landlord, read our guide for landlords and leaseholders too. Find legal and commercial advisers.

Metering and regulation. Mostly relevant if you already supply heat to others, for example through a communal system or a campus network. Ofgem became the regulator on 27 January 2026[source], and existing networks must register by 26 January 2027[source]. A new Heat Network Technical Assurance Scheme (HNTAS) is coming too, with a planned launch in 2027, phased in[source]. Ofgem authorisation, metering and billing and HNTAS specialists are listed separately.

Start with the decision, not the firm

Before you contact anyone, write down the decision you need to make. "Help us with heat network zoning" is not a brief. These are:

• Are we above or below 100 MWh heat demand a year, and how confident can we be?
• Our boilers are due for replacement in three years. Should we replace like-for-like, install a heat pump or wait for a heat network?
• We've received a connection notice. Is the developer's offer reasonable, and do we have grounds for an exemption?

Each of these needs a different kind of firm and a different amount of work. The first might be a short desk exercise. The third could involve engineering, commercial and legal input. Being clear about the question is the best protection against paying for a report that answers a different one.

What to ask before you hire

Send every firm the same questions, in writing.

Ask what similar buildings they've worked on, in your sector and at your scale. A firm that has spent years designing city-scale networks for councils may be less suited to a single hotel's connection negotiation, and the reverse is also true.

Ask who will actually do the work. The partner who pitches is not always the person who writes the report.

Ask what data they need from you, what they'll do if your data is incomplete, and how they'll show their assumptions. If they're going to estimate heat demand, ask how.

Ask what they think the risks are for your building. A good adviser will tell you plainly when you probably don't need much help yet.

Finally, ask whether they hold professional indemnity insurance appropriate to the work, and for a reference from a client with a similar building.

Conflicts of interest

This is the question many building owners forget to ask. A lot of heat network consultants also work for councils, central government or zone developers. Some wrote the zone opportunity reports for the zoning pilot, and our place pages show the published authors where we know them. Councils will usually lead the zone coordination bodies, which are set up by local government; the zoning authority can step in if councils cannot agree within 28 days[source].

None of that is necessarily a dealbreaker. A firm that knows the local network plans in detail can be very useful to you. But you need to know where its other loyalties lie, especially if you're negotiating against a developer it also advises or challenging a decision made by a council it works for.

So ask directly: "Do you currently act, or expect to act, for the zone developer, the council or the coordination body in our area?" Then ask how they'd manage that. A straightforward firm will answer clearly and put it in writing. If the answer is evasive, treat that as information.

Red flags

Some warning signs are specific to zoning right now.

Anyone claiming you must connect today. As of our last check the zoning regulations were not yet laid before Parliament[source], so they are not in force, and no zones have been designated. If someone says otherwise, ask to see the designation. Early conversations with developers in places where networks are being planned are normal, but they are voluntary until the rules exist.

Guaranteed exemptions. Nobody can promise an exemption. The coordination body will decide each case on its evidence, and the detailed rules aren't final. Temporary exemptions would also be time-limited, at up to 2 years from the end of the proposed connection window[source]. An honest adviser talks about the strength of your case, not certainty.

Scare tactics about penalties. Proposed penalties are serious, at up to £1 million or 10% of annual turnover, whichever is higher[source], but they aren't law yet and they're aimed at owners who ignore the process. Use that figure to take zoning seriously, not to sign a contract in a hurry.

Vague scopes. If a firm won't say what you'll get, by when and for how much, you'll struggle to hold it to anything.

How pricing works

Consultants usually charge in one of three ways.

Day rates. You pay for time spent. This suits open-ended work, such as ongoing support through a negotiation, but your total cost is uncertain. If you agree day rates, set a cap and ask for regular updates on time used.

Fixed-fee scopes. You agree a price for defined deliverables. This is usually the best fit for feasibility studies, heat demand assessments and exemption applications, because the output is clear. The quality of a fixed fee depends entirely on the quality of the scope.

Success fees. Part of the fee depends on an outcome, such as a reduced connection charge or a granted exemption. These can align interests, but think about the incentives. A fee paid only if an exemption is granted could tempt a firm to push a weak application. Make sure "success" is defined precisely and that you'd still want the advice if the outcome went the other way.

We don't publish typical fees. We haven't found reliable public data, and the right price depends heavily on your building, your data and how much is at stake. Treat any single figure you see quoted elsewhere with caution.

Getting quotes you can compare

The way to find a fair price is to make firms compete on the same thing.

Turn your decision into a short written scope with defined deliverables. For a heat demand assessment, that might be: a written statement of annual heat demand for heating and hot water, based on three years of metered data you'll supply; a clear list of assumptions and adjustments; a view on where you sit against the 100 MWh threshold and how confident that view is; and one meeting to talk it through.

Send the same scope and the same data pack to at least three firms and ask for a fixed fee. When the quotes come back, compare like with like. Check what each includes and excludes, how many meetings and rounds of revisions are covered, who'll do the work, how long it will take and what triggers extra charges. A cheaper quote that excludes the site visit isn't cheaper.

Then judge value against what the advice is for. A modest fee that tells you confidently you're well under the threshold may save you years of uncertainty. A larger fee may be well spent if it shapes a connection agreement that runs for decades.

What makes a consultant the best fit

People search for the best heat network consultants as if there were a league table. There isn't one, and you should be wary of anyone who claims to publish it. The best consultant for you is the one that has done the specific job you need, in buildings like yours, recently, and can show it.

In practice that means three things. Relevant, named projects you can check. The person who did that work being the person who will do yours. And a straight answer about who else they work for in your area. A firm that scores well on all three is a better choice than a bigger name that doesn't.

How our listings work

Our consultant directory is free to use and free to appear in. We write each listing ourselves from public information, and nobody pays to be listed or ranked higher. Firms marked Unconfirmed haven't yet checked their entry, so treat those details as our best reading of public sources. You can filter by service, using the links above, or by place, such as Leeds or Bristol.

If you'd like an introduction, use the form on a firm's profile. We pass your message on and copy you in, at no cost to you.