- Companies
- Plumbers and heating engineers
- Newcastle upon Tyne
- W.O. Silmon Limited
W.O. Silmon Limited
- Company number
- 00754813
- Incorporated
- 25 Mar 196363 years trading
- Registered office
- Industry Road, Heaton, Newcastle upon Tyne, Tyne & Wear, NE6 5XB
- Nature of business
- Plumbing, heat and air-conditioning installation
W.O. Silmon Limited is a 63-year-old private limited company registered in Newcastle upon Tyne, company number 00754813, one of 164 plumbing and heating companies in Newcastle upon Tyne. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
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 £51K (+5.4%) on the year before, to £982K.
- Net assets rose in 4 of 5 year-on-year comparisons on record.
- Current assets of £1.2M against £350K owed within a year: 3.5 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £982K | £840K | £1.2M | £350K | 0 |
| 31 Mar 2025 | £931K | £695K | £994K | £170K | 9 |
| 31 Mar 2024 | £875K | £710K | £951K | £138K | 8 |
| 31 Mar 2023 | £815K | £697K | £898K | £131K | 8 |
| 31 Mar 2022 | £759K | £598K | £833K | £106K | 8 |
| 31 Mar 2021 | £832K | £738K | £936K | £151K | 9 |
Who runs and owns W.O. Silmon Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (3)
| Name | Role | Appointed |
|---|---|---|
| S*** S*** | Director | before Sep 1992 |
| M*** S*** | Director | Sep 2005 |
| S*** S*** | Secretary | before Sep 1992 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| M*** S*** | Director | Sep 2016 |
People with significant control (2)
Public contracts won
W.O. Silmon Limited has 4 public sector contract awards on record; the ones with their own published value total £237K, from 2016 to 2025. Source: Contracts Finder and Find a Tender award notices. 3 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Newcastle City Council2 awards
- Sunderland City Council1 award
- Northumberland County Council1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Sunderland City Council | Maintenance, Service and Repair of Fuel Tanks | £100K | 11 Apr 2025 |
| Northumberland County Council | NCC1084 Coopies Lane Depot Bulk Fuel Tank Replacement | £55K | 18 Dec 2024 |
| Newcastle City Council | 005874 - Fuel Facilities Service & Maintenance - Awarded | £60K | 29 Jun 2017 |
| Newcastle City Council | 005258 - Fuel Management System | £22K | 8 Feb 2016 |
Where W.O. Silmon Limited is registered
The registered office is in Newcastle upon Tyne (NE6), in the Newcastle upon Tyne local authority area, North East. Show NE6 5XB on a map.
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- Dmak Solutions LtdMachinery repair and installation
- Byker Tyre and Autocare LimitedMechanics and garages
- CN Construction Services LtdSpecialist contractors
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What happens if W.O. Silmon 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 00754813
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 March 1963 (63 years ago)
- Registered office
- Industry Road, Heaton, Newcastle upon Tyne, Tyne & Wear, NE6 5XB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 27 September 2026
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Newcastle upon Tyne
Other active plumbing and heating companies registered in Newcastle upon Tyne.
- Warm Care Ltd2020
- Warm4U Ltd2022
- Wilson Heat Services Limited2022
- Your Renewables Ltd2024
- A Splash of Class Ne Ltd2025
- A&M Plumbing and Heating Specialists Limited2017
- Abm Energy Ltd2019
- Acdc Plumbing & Heating Services Ltd2019
All plumbing and heating companies in Newcastle upon Tyne · All trades in Newcastle upon Tyne · Plumbers and heating engineers across the UK
Frequently asked questions
When are W.O. Silmon Limited's accounts due?
W.O. Silmon Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is W.O. Silmon Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is W.O. Silmon Limited still trading?
W.O. Silmon 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 W.O. Silmon Limited do?
W.O. Silmon Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is W.O. Silmon Limited?
W.O. Silmon Limited was incorporated on 25 March 1963, 63 years ago.
Who runs W.O. Silmon Limited?
W.O. Silmon Limited has 2 active directors, the longest-serving appointed in Sep 2005. Their names and service addresses are on the Companies House register.
Who owns W.O. Silmon Limited?
2 people or companies have significant control of W.O. Silmon Limited: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
Has W.O. Silmon Limited won public sector contracts?
Yes. W.O. Silmon Limited has 4 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £237K), most recently from Sunderland City Council.
What is the penalty if W.O. Silmon 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 W.O. Silmon 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.