UK SIC 2007 · 41201
Construction of commercial buildings (SIC code 41201)
Construction of commercial buildings is UK SIC code 41201. It sits in division 41 (Construction of buildings) of the SIC 2007 list. On the August 2026 Companies House register, 40,351 active UK companies list 41201 among their SIC codes. 33,492 of them list it first. That makes it the third most used code in its division.
Division 41: Construction of buildings
Division 41 is one of the most used classifications on the UK register. It splits three ways. Code 41100, development of building projects, is picked by developers and by companies set up to hold one scheme. Then come the two building codes. Code 41202 covers domestic construction, so house builders and residential contractors live there. Code 41201 covers commercial buildings. The developer code is popular partly because property investors use it for their ventures. So plenty of 41100 companies employ no tradespeople at all.
Related SIC codes
Who prospects SIC 41201 companies
The construction supply chain sells into this division from every side. Builders' merchants and tool hire firms want trade accounts. Insurance brokers arrange contract works and liability cover. Accountants untangle CIS and the VAT reverse charge. Software firms sell estimating and project tools. Development finance brokers and lenders focus on 41100 incorporations, which often come just before a land purchase. Under 41202, a new company usually means a sole trader has gone limited. That is the best moment for accountancy and insurance offers. Growth signals mean bigger projects and a bigger materials spend.
Lead generation for trades & construction →How to read SIC 41201
SIC 41201 is a five-digit code, and the digits are not arbitrary. The first two, 41, are the division, construction of buildings. Add the third and you have group 412; 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 41201 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 41201 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 41201 are London (7,417), Manchester (666), Ilford (646), Birmingham (557) and Romford (529). 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 41201 as a filter
40,351 companies is 0.78 per cent of the 5,190,464 active companies on the UK register, and ranks 41201 third most used of the 3 codes we track in division 41. 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 41201
33,492 companies put 41201 first and a further 6,859, 17 per cent, list it in one of their other three SIC slots. That gap is the difference between a tight list and a broad one. First-code-only is the safer filter when you are writing to them; matching any position is worth it when you need the volume.
These companies are spread out. London is the largest single cluster at 18 per cent and the top five post towns together hold only 24 per cent, so the remaining 76 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 41201 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: 41201, registered office in London, incorporated in the last ninety days, which turns a 40,351 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 41201 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 41201 companies, as leads
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About SIC 41201
How many UK companies use SIC code 41201?
40,351 active UK companies list 41201 (Construction of commercial buildings) among their registered SIC codes. Each company may register up to four. Of those, 33,492 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
What is the difference between 41100 and the construction codes 41201 and 41202?
Code 41100 is for developing building projects. That means pulling together land, funding and consents, then subcontracting the build. Codes 41201 and 41202 are for physically constructing commercial and domestic buildings. A developer who also builds can list both. Small builders sometimes pick 41100 when 41202 fits better. The public record accepts either, but the right code helps insurers and lenders read the business correctly.
Should a builder change SIC code when moving from renovations to new builds?
Often not. Renovation, extension and refurbishment of houses sits under 41202, alongside new build domestic work. If your work is really one trade, a division 43 code may fit better than 41. Review your codes at each confirmation statement. No approval is needed, and it keeps the public record in line with what the business actually does.
Find UK SIC 41201 companies
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