UK SIC 2007 · 43991
Scaffold erection (SIC code 43991)
Scaffold erection is UK SIC code 43991. It sits in division 43 (Specialised construction activities) of the SIC 2007 list. On the August 2026 Companies House register, 6,637 active UK companies list 43991 among their SIC codes. 6,172 of them list it first.
Division 43: Specialised construction activities
This is the trades division, and one of the biggest classifications on the UK register. Electricians use 43210. Plumbing and heating engineers use 43220. Roofers use 43910. Plasterers, painters, glaziers, floorers and scaffolders each have a code of their own. Two broad codes swell the numbers further. Code 43999 covers specialised activities not elsewhere classified. Code 43390 covers other building completion and finishing. Both soak up general trades and multi-skilled firms. Most companies here are small. Many are one tradesperson who went limited for contracting or tax reasons.
Related SIC codes
Who prospects SIC 43991 companies
Lots of firms sell to the trades, because their needs are predictable and repeat every year. They buy public liability insurance, accountancy for CIS refunds and company compliance, van leasing, tools and trade credit from merchants. Lead generation and website services aim at the poor-website filter. A tradesperson whose site fails basic checks loses local work to rivals who show up in search. New incorporations are the standout signal. They usually mark the jump from sole trader to limited company, when insurance, banking and bookkeeping all get chosen in a few weeks. Heating firms under 43220 also attract renewables sellers, especially heat pump distributors.
Lead generation for trades & construction →How to read SIC 43991
SIC 43991 is a five-digit code, and the digits are not arbitrary. The first two, 43, are the division, specialised construction activities. Add the third and you have group 439; 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 F, construction, 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 43991 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 43991 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 43991 are London (444), Glasgow (136), Bristol (117), Rochester (101) and Liverpool (81). 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 43991 as a filter
6,637 companies is 0.13 per cent of the 5,190,464 active companies on the UK register, and ranks 43991 12th most used of the 15 codes we track in division 43. 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 43991
Almost everybody who uses 43991 means it: 6,172 of 6,637 companies put it first, leaving only 465 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 7 per cent and the top five post towns together hold only 13 per cent, so the remaining 87 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 43991 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: 43991, registered office in London, incorporated in the last ninety days, which turns a 6,637 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 43991 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 43991 companies, as leads
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About SIC 43991
How many UK companies use SIC code 43991?
6,637 active UK companies list 43991 (Scaffold erection) among their registered SIC codes. Each company may register up to four. Of those, 6,172 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
Should a multi-trade builder use 43999 or a specific trade code?
If one trade brings in most of your income, use its own code. That means 43210 for electrical work or 43220 for plumbing and heating. Specific codes read better to insurers and merchants. Genuinely multi-skilled firms use 43999 or 43390, or list up to four codes covering their main trades. The choice is yours. Companies House records it without judgement, and you can change it on any confirmation statement.
Does my SIC code need to match my trade qualifications or scheme memberships?
There is no formal link. Gas Safe registration, NICEIC enrolment and similar schemes are checked on their own registers, not at Companies House. Matching the code to your trade is still worth doing. Customers, insurers and finance providers do look at it, and a mismatch invites questions. If the business changes direction, update the code on your next CS01 confirmation statement.
Find UK SIC 43991 companies
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