UK SIC 2007 · 35300
Steam and air conditioning supply (SIC code 35300)
Steam and air conditioning supply is UK SIC code 35300. It sits in division 35 (Electricity, gas, steam and air conditioning supply) of the SIC 2007 list. On the August 2026 Companies House register, 1,813 active UK companies list 35300 among their SIC codes. 1,563 of them list it first. That makes it the third most used code in its division.
On paper this is the utilities sector. On the UK register it is mostly energy project vehicles. The busiest code is 35110, production of electricity. It is full of special purpose companies that hold one asset each: a solar farm, a wind turbine, a battery storage site or a hydro scheme. Lenders prefer them separated, so each asset gets its own company. Code 35140, trade of electricity, holds licensed suppliers and power purchase intermediaries. Gas, steam and air conditioning supply codes sit here as well, with far fewer companies.
Related SIC codes
Who prospects SIC 35300 companies
So many entries are single-asset vehicles that professional services dominate the selling. Accountants and company secretarial providers run portfolios of these vehicles. Every new one incorporated is new work, and the flow tracks renewable development closely. Legal advisers, energy asset insurers, and operations and maintenance contractors watch the same formations. Watch for a cluster of new companies sharing directors or an address. That is a developer building out a pipeline. Approach the developer once, not vehicle by vehicle. Filing deadlines land across a whole portfolio at the same time, which suits compliance services.
Lead generation for accountants & bookkeepers →How to read SIC 35300
SIC 35300 is a five-digit code, and the digits are not arbitrary. The first two, 35, are the division, electricity, gas, steam and air conditioning supply. Add the third and you have group 353; the fourth narrows it to a class, and the fifth to the subclass, which is the level Companies House actually asks a company to pick. The whole division sits under section D, electricity, gas, steam and air conditioning supply, the broadest tier there is. Reading a code left to right therefore goes from a whole sector down to one activity.
More on how SIC 35300 is built
A company chooses its own codes when it incorporates and can change them on any confirmation statement. It may list up to four, and Companies House does not check whether they are right. That is why 35300 is worth reading as a claim the company made about itself rather than as a verified fact, and why the first-position and any-position counts above differ.
Measured on the August 2026 register, the busiest registered-office post towns for 35300 are London (222), Glasgow (31), Bristol (31), Manchester (29) and Blackburn (20). Those are registered-office locations, which is where the paperwork sits rather than necessarily where the work happens, so treat them as where to start looking rather than as a service area.
Using SIC 35300 as a filter
1,813 companies is 0.03 per cent of the 5,190,464 active companies on the UK register, and ranks 35300 third most used of the 6 codes we track in division 35. That is the pool before any filter. Whether it is a big market for you depends on what you sell, but it is the number every other filter on this page cuts down from.
More on filtering by SIC 35300
Almost everybody who uses 35300 means it: 1,563 of 1,813 companies put it first, leaving only 250 carrying it as a secondary code. That makes it an unusually clean filter. You can match on the code alone and trust that the companies you get really are in this line of work.
These companies are spread out. London is the largest single cluster at 12 per cent and the top five post towns together hold only 18 per cent, so the remaining 82 per cent sits across the rest of the country. A regional filter narrows this list without gutting it, which makes it a reasonable code to work territory by territory.
In practice the code on its own is rarely the whole filter. Pair 35300 with an incorporation date to catch companies in their first months, when they are still choosing suppliers, or with a filing deadline to reach them while the year end is on their mind. A worked example for this code: 35300, registered office in London, incorporated in the last ninety days, which turns a 1,813 company pool into a list you can write to in an afternoon. Add the poor-website filter if what you sell is a website, or a recent change of officer if you sell to whoever just took the job. Every company you pull carries the Companies House record, the director's name, a verified website and a verified email, and the ones we cannot complete are not charged.
Where SIC 35300 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 35300 companies, as leads
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About SIC 35300
How many UK companies use SIC code 35300?
1,813 active UK companies list 35300 (Steam and air conditioning supply) among their registered SIC codes. Each company may register up to four. Of those, 1,563 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
Which SIC code should a company set up to own a solar installation use?
Use 35110, production of electricity. It is the standard for generation assets of any type, including solar, wind, hydro and battery-backed generation. Companies that buy and resell power, rather than generate it, fit 35140. Developers sometimes add a construction or project development code during the build. The company chooses freely, and can revise codes on each confirmation statement as the project moves from build to operation.
Do all the SPVs in an energy portfolio need the same SIC code?
No rule says they must, but consistency helps. Each company declares its own codes at incorporation, and there is no group-level classification. Most developers standardise on 35110 for generation vehicles. Lenders, insurers and counterparties can then read the whole portfolio at a glance. If you buy a vehicle carrying an old code, align it on its next CS01 confirmation statement. No approval is involved.
Find UK SIC 35300 companies
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