- Companies
- Civil engineering
- London
- Siyari Limited
Siyari Limited
- Company number
- 16210338
- Incorporated
- 27 Jan 20251 year trading
- Registered office
- 37 Hector Street, London, SE18 1QT
- Nature of business
- Construction of railways and underground railways
Siyari Limited is a 1-year-old private limited company registered in London, company number 16210338, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 27 October 2026, and its first CT600 is due at HMRC on 26 January 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 Siyari Limited is registered
The registered office is in London (SE18), in the Greenwich local authority area, London. Show SE18 1QT on a map.
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What happens if Siyari Limited 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 27 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 28 Oct 2026 to 27 Nov 2026 | £150 |
| 1 to 3 months late | 28 Nov 2026 to 27 Jan 2027 | £375 |
| 3 to 6 months late | 28 Jan 2027 to 27 Apr 2027 | £750 |
| More than 6 months late | From 28 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 16210338
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 January 2025 (1 year ago)
- Registered office
- 37 Hector Street, London, SE18 1QT
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 26 January 2026
- Previous names
- Niwar Muhammad Ahmad Limited (until 4 Aug 2026)
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- Skinner Engineering Ltd2012
- Skyline Edge Limited2024
- Sladholdings Limited2016
- Slawomir Cucura Steel Works Limited2015
- Slogistics Limited2014
- SM Civils Ltd2026
- SM Network Solutions Ltd2022
- Smaa Construction Ltd2021
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Siyari Limited's accounts due?
Siyari Limited's next accounts are due at Companies House by 27 October 2026 (in 14 days), covering the period to 31 January 2026.
When is Siyari Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 26 January 2026, due by 26 January 2027, and one for the period to 31 January 2026, due by 31 January 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Siyari Limited still trading?
Siyari Limited 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 Siyari Limited do?
Siyari Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is Siyari Limited?
Siyari Limited was incorporated on 27 January 2025, 1 year ago.
What is the penalty if Siyari Limited 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 Siyari Limited 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.