UK SIC 2007 · 33130
Repair of electronic and optical equipment (SIC code 33130)
Repair of electronic and optical equipment is UK SIC code 33130. It sits in division 33 (Repair and installation of machinery and equipment) of the SIC 2007 list. On the August 2026 Companies House register, 931 active UK companies list 33130 among their SIC codes. 799 of them list it first.
This division keeps industry's equipment running. It does not make it. UK registrations spread across several large codes. Machinery repair is 33120. Electrical equipment repair is 33140. Repair of other equipment is 33190. Installing industrial machinery is 33200. Transport has its own codes, including 33160 for aircraft maintenance and 33170 for other transport equipment. The typical company is a mobile engineering firm or a small specialist workshop. A time-served engineer usually started it. They serve factories, sites and operators across one region.
Who prospects SIC 33130 companies
Field service work runs on scheduling, quoting and job management. That makes this a good place to look for software firms selling those tools, above all where engineer headcount is growing. Parts distributors, calibration houses, tool suppliers and van leasing providers work it too. Almost every firm here runs vans. A new incorporation is usually an engineer going self-employed with one anchor customer. They need insurance, invoicing tools and a proper website within weeks. The poor-website filter flags that exact stage. Aviation maintenance firms under 33160 are a separate, more heavily regulated niche.
Lead generation for founders & owners →How to read SIC 33130
SIC 33130 is a five-digit code, and the digits are not arbitrary. The first two, 33, are the division, repair and installation of machinery and equipment. Add the third and you have group 331; 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 C, manufacturing, 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 33130 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 33130 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 33130 are London (108), Milton Keynes (14), Liverpool (14), Manchester (12) and Leicester (12). 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 33130 as a filter
931 companies is 0.02 per cent of the 5,190,464 active companies on the UK register, and ranks 33130 9th most used of the 9 codes we track in division 33. 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 33130
Almost everybody who uses 33130 means it: 799 of 931 companies put it first, leaving only 132 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 17 per cent, so the remaining 83 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 33130 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: 33130, registered office in London, incorporated in the last ninety days, which turns a 931 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 33130 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
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About SIC 33130
How many UK companies use SIC code 33130?
931 active UK companies list 33130 (Repair of electronic and optical equipment) among their registered SIC codes. Each company may register up to four. Of those, 799 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
What separates repair codes in division 33 from installation codes in division 43?
Division 33 is about industrial machinery and equipment. Think repairing production lines, installing factory plant and maintaining commercial kit. Division 43 is about building services: electrical wiring, plumbing and HVAC inside buildings. An engineer installing a packaging machine uses 33200. An electrician wiring the factory uses 43210. Firms doing both can list codes from both divisions, within the four-code limit.
Which code should a maintenance engineer choose when several division 33 codes could apply?
Pick the one that matches the kit you work on most. Use 33120 for mechanical machinery and 33140 for electrical equipment. Use 33190 when the mix defies a label. Getting it perfect matters less than you might think. The codes are self-declared, unchecked, and easy to amend on the confirmation statement. Choose the closest fit now and refine it as you settle into a specialism.
Find UK SIC 33130 companies
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