- Companies
- Finishing trades
- London
- Siro Build Ltd
Siro Build Ltd
- Company number
- 16640035
- Incorporated
- 10 Aug 20251 year trading
- Registered office
- 16 Knotts Green Road, London, E10 6DE
- Nature of business
- Other building completion and finishing
Siro Build Ltd is a 1-year-old private limited company registered in London, company number 16640035, one of 3,947 building finishing companies in London. Its next accounts are due at Companies House on 10 May 2027, and its first CT600 is due at HMRC on 9 August 2027.
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.
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Where Siro Build Ltd is registered
The registered office is in London (E10), in the Waltham Forest local authority area, London. Show E10 6DE on a map.
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What happens if Siro Build 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 10 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 May 2027 to 10 Jun 2027 | £150 |
| 1 to 3 months late | 11 Jun 2027 to 10 Aug 2027 | £375 |
| 3 to 6 months late | 11 Aug 2027 to 10 Nov 2027 | £750 |
| More than 6 months late | From 11 Nov 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 2028 | 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
- 16640035
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 August 2025 (1 year ago)
- Registered office
- 16 Knotts Green Road, London, E10 6DE
- Nature of business
- Other building completion and finishing (SIC 43390)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for building finishing companies
Finishing trade companies cover a wide range of work. Most are micro-entities with simple accounts and a straightforward CT600.
Similar companies in London
Other active building finishing companies registered in London.
- Sitemax Ltd2026
- Sixteen30 Ltd2014
- SJD Build Ltd2022
- SK Construction Services Ltd2022
- SK Lettings & Management Limited2022
- Skewbridge PM Ltd2026
- Skill Hands Ltd2025
- Skillarchie Ltd2023
All building finishing companies in London · All trades in London · Finishing trades across the UK
Frequently asked questions
When are Siro Build Ltd's accounts due?
Siro Build Ltd's next accounts are due at Companies House by 10 May 2027 (in 210 days), covering the period to 31 August 2026.
When is Siro Build 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 9 August 2026, due by 9 August 2027, and one for the period to 31 August 2026, due by 31 August 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Siro Build Ltd still trading?
Siro Build Ltd is listed as active on the Companies House register (checked 12 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 Siro Build Ltd do?
Siro Build Ltd is registered under Other building completion and finishing (SIC 43390).
How old is Siro Build Ltd?
Siro Build Ltd was incorporated on 10 August 2025, 1 year ago.
What is the penalty if Siro Build 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 Siro Build Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.