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- Siemsatec Ltd
Company profile · Specialist contractors
Siemsatec Ltd
Siemsatec Ltd is a 22-year-old private limited company registered in Beckenham, company number 05244032, one of 32 specialist construction companies in Beckenham. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 March 2025, as filed at Companies House.
Siemsatec Ltd over the years
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £278K (+26.5%) on the year before, to £1.3M.
- Net assets rose in 5 of 5 year-on-year comparisons on record.
- Current assets of £2.1M against £819K owed within a year: 2.6 times cover.
- 14 employees on average, down from 16 the year before.
- Balance sheets on record for 7 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £1.3M | £1.1M | £2.1M | £819K | 14 |
| 31 Mar 2024 | £1M | £939K | £1.8M | £803K | 16 |
| 31 Mar 2023 | £924K | £629K | £1.6M | £687K | 14 |
| 31 Mar 2022 | £662K | £577K | £1.1M | £393K | 10 |
| 31 Mar 2021 | £520K | £444K | £946K | £399K | 10 |
| 31 Mar 2019 | £426K | £178K | £667K | £258K | |
| 31 Mar 2018 | £330K | £159K | £706K | £391K |
Public contracts won
Siemsatec Ltd has 6 public sector contract awards on record; the ones with their own published value total £755K, from 2018 to 2026. Source: Contracts Finder and Find a Tender award notices. These were matched by the company's exact name because the notice gave no company number.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| London Borough of Hackney | Hackney Service Centre Building Management System (BMS) Upgrade | £101K | 23 Sep 2026 |
| King's College Hospital NHS Foundation Trust | Provision of Building Management System Maintenance Services | £32K | 14 Jul 2026 |
| East & North Hertfordshire NHS Trust | ENHT - BMS Maintenance Support Services | £88K | 15 Sep 2025 |
| GSTT - Smart Together | BMS maintenance and support - SLaM | £281K | 20 May 2024 |
| South London and Maudsley NHS Foundation Trust | SLaM - BMS Head End Upgrade - ST21-P015 | £123K | 1 Nov 2021 |
| South London and the Maudsley NHS Foundation Trust | SLaMT2017-027 BMS Maintenance and Servicing | £131K | 11 Jun 2018 |
Where Siemsatec Ltd is registered
The registered office is in Beckenham (BR3), in the Bromley local authority area, London. Show BR3 1AG on a map.
Other trade companies in BR3
- Sxxiaoman LtdMotor traders
- Osiris Heating and Cooling LtdMachinery repair and installation
- Sundar Trade LimitedMotor traders
- Energy Planet UK LimitedMachinery repair and installation
- Hatchpro Marine Service LimitedMachinery repair and installation
- Towers Plumbing and Heating LtdPlumbers and heating engineers
- BG Facilities & Property LtdPainters and decorators
- Jad Motors London LimitedMechanics and garages
Also registered at this address
10 other companies use the same registered office as Siemsatec Ltd.
- Alpha Teams Residential LtdFacilities management
- Bha Construction UK LimitedBuilders
- Cure Property Management LimitedFacilities management
- CVQS LtdSpecialist contractors
- Goldcrestworks LimitedPlumbers and heating engineers
- Randalswood Construction UK LimitedBuilders
- Reliable Construction Group LtdPlumbers and heating engineers
- Tes Build LtdFinishing trades
- Tes Facilities Management LimitedFinishing trades
- TH Didcot LimitedBuilders
What happens if Siemsatec 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 05244032
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 September 2004 (22 years ago)
- Registered office
- 137-139 High Street, Beckenham, Kent, BR3 1AG
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
Other engineering activities (SIC 71129) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 28 September 2025
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Beckenham
Other active specialist construction companies registered in Beckenham.
- Silver Screen Construction Ltd2019
- SK Construction & Landscaping Ltd2026
- SM Preservations Ltd2020
- Wikea Services Limited2025
- 1ST Class Group Limited2007
- 3Cycle Ltd2020
- 888 Rigging Ltd2024
- A&M Garden and General Maintenance Ltd2020
All specialist construction companies in Beckenham · All trades in Beckenham · Specialist contractors across the UK
Frequently asked questions
When are Siemsatec Ltd's accounts due?
Siemsatec Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Siemsatec Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Siemsatec Ltd still trading?
Siemsatec 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 Siemsatec Ltd do?
Siemsatec Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999); Other engineering activities (SIC 71129).
How old is Siemsatec Ltd?
Siemsatec Ltd was incorporated on 28 September 2004, 22 years ago.
Has Siemsatec Ltd won public sector contracts?
Yes. Siemsatec Ltd has 6 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £755K), most recently from London Borough of Hackney.
What is the penalty if Siemsatec 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 Siemsatec 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.