Greenmag Ltd
- Company number
- 17270696
- Incorporated
- 9 Jun 2026
- Registered office
- 260B High Street, Langley, SL3 8HA
- Nature of business
- Construction of commercial buildings; Wholesale of electronic and telecommunications equipment and parts
Greenmag Ltd is a newly incorporated private limited company registered in Langley, company number 17270696, one of the UK's building contractors. Its next accounts are due at Companies House on 9 March 2028, and its first CT600 is due at HMRC on 8 June 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
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Where Greenmag Ltd is registered
The registered office is in Langley (SL3), in the Slough local authority area, South East. Show SL3 8HA on a map.
Other trade companies in SL3
- Tac Design & Build LtdFinishing trades
- G&S Formwork LtdBuilders
- Klenzo LtdCleaning companies
- West London Crown Construction LtdBuilders
- Dahlia Investment Group LimitedProperty developers
- Ekon Electrics LtdElectricians
- R&G Maintenance LtdCleaning companies
- Cornerstone Homes & Estates LtdProperty developers
What happens if Greenmag Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 9 March 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 10 Mar 2028 to 9 Apr 2028 | £150 |
| 1 to 3 months late | 10 Apr 2028 to 9 Jun 2028 | £375 |
| 3 to 6 months late | 10 Jun 2028 to 9 Sep 2028 | £750 |
| More than 6 months late | From 10 Sep 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2028 | £200 |
| 3 months late | 30 Sep 2028 | another £200 |
| 6 months late | 30 Dec 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 2029 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 17270696
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 June 2026
- Registered office
- 260B High Street, Langley, SL3 8HA
- Nature of business
- Construction of commercial buildings (SIC 41201)
Wholesale of electronic and telecommunications equipment and parts (SIC 46520) - Year end
- 30 June (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies
Other active building contractors.
Frequently asked questions
When are Greenmag Ltd's accounts due?
Greenmag Ltd's next accounts are due at Companies House by 9 March 2028 (in 514 days), covering the period to 30 June 2027.
When is Greenmag Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 8 June 2027, due by 8 June 2028, and one for the period to 30 June 2027, due by 30 June 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Greenmag Ltd still trading?
Greenmag Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Greenmag Ltd do?
Greenmag Ltd is registered under Construction of commercial buildings (SIC 41201); Wholesale of electronic and telecommunications equipment and parts (SIC 46520).
How old is Greenmag Ltd?
Greenmag Ltd was incorporated on 9 June 2026, less than a year ago.
What is the penalty if Greenmag Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Greenmag Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.