- Companies
- Machinery repair and installation
- Londonderry
- S3 Alliance Limited
S3 Alliance Limited
- Company number
- NI065895
- Incorporated
- 13 Aug 200719 years trading
- Registered office
- 85A Ledwidge Avenue, Ebrington, Londonderry, Londonderry, BT47 6GZ
- Nature of business
- Repair of other equipment; Installation of industrial machinery and equipment
S3 Alliance Limited is a 19-year-old private limited company registered in Londonderry, company number NI065895, one of 22 machinery repair and installation companies in Londonderry. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for S3 Alliance LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 down £64K (-17.2%) on the year before, to £310K.
- Net assets rose in 4 of 8 year-on-year comparisons on record.
- Current assets of £1.1M against £890K owed within a year: 1.2 times cover.
- 8 employees on average, up from 0 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £310K | £428K | £1.1M | £890K | 8 |
| 31 Dec 2024 | £374K | £305K | £880K | £638K | 0 |
| 31 Dec 2023 | £424K | £766K | £1.9M | £1.6M | 9 |
| 31 Dec 2022 | £223K | £487K | £960K | £819K | 9 |
| 31 Dec 2021 | £357K | £869K | £2.1M | £1.8M | 4 |
| 31 Dec 2020 | £606K | £442K | £1M | £500K | 3 |
| 31 Dec 2019 | £471K | £391K | £998K | £551K | 4 |
| 31 Dec 2018 | £381K | £287K | £894K | £539K | |
| 31 Dec 2017 | £273K | £120K | £1M | £737K | |
| 31 Dec 2016 | £190K |
Public contracts won
S3 Alliance Limited has one public sector contract award on record; the ones with their own published value total £305K (2024). 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 |
|---|---|---|---|
| University of Strathclyde | Supply, Delivery and Installation of wafer dicing kit for NMIS | £305K | 4 Dec 2024 |
Where S3 Alliance Limited is registered
The registered office is in Londonderry (BT47), in the Derry City and Strabane local authority area, Northern Ireland. Show BT47 6GZ on a map.
Other trade companies in BT47
- RNK Contracts LimitedGroundworks and demolition
- Den Electrical LtdElectricians
- BDK Consulting LimitedProperty developers
- Oakline Engineering LtdInstallers
- Killew Property Services LimitedFacilities management
- PH Autobody LimitedMechanics and garages
- C Doherty Autos LtdMechanics and garages
- CPMH LtdBuilders
What happens if S3 Alliance 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- NI065895
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 August 2007 (19 years ago)
- Registered office
- 85A Ledwidge Avenue, Ebrington, Londonderry, Londonderry, BT47 6GZ
- Nature of business
- Repair of other equipment (SIC 33190)
Installation of industrial machinery and equipment (SIC 33200) - Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 13 August 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Londonderry
Other active machinery repair and installation companies registered in Londonderry.
- TJ McConnell and Sons Ltd2013
- Vultron Machinery Ltd2026
- Ward Tech Limited2016
- Acl Ireland Ltd2022
- Aj Haulage & Plant Hire Limited2023
- BMG Electrical Services Ltd2024
- Cardano Properties Limited2024
- Centre Electrical Services Ltd2013
All machinery repair and installation companies in Londonderry · All trades in Londonderry · Machinery repair and installation across the UK
Frequently asked questions
When are S3 Alliance Limited's accounts due?
S3 Alliance Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is S3 Alliance Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is S3 Alliance Limited still trading?
S3 Alliance 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 S3 Alliance Limited do?
S3 Alliance Limited is registered under Repair of other equipment (SIC 33190); Installation of industrial machinery and equipment (SIC 33200).
How old is S3 Alliance Limited?
S3 Alliance Limited was incorporated on 13 August 2007, 19 years ago.
Has S3 Alliance Limited won public sector contracts?
Yes. S3 Alliance Limited has one contract award from public bodies on Contracts Finder and Find a Tender (those with their own published value total £305K), most recently from University of Strathclyde.
What is the penalty if S3 Alliance 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 S3 Alliance 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.